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| 73m1 822/73m1922 microdaa silicon daa with serial interface simplifying system integration ? data sheet ds_1x22_001 april 2010 rev. 1.6 ? 2010 teridian semiconductor corporation 1 description the 73m1822 microdaa ? is the worlds first single - package silicon data access arrangement ( daa) for data/fax modem and voice applications. it provides a serial modem analog front end (mafe) interface to popular dsp/host processors to implemen t a globally compliant low - cost soft modem solution. the 73m1822 microdaa is available as a two - chip configuration (the 73m1922) that consists of a 73m1902 host - side device and a 73m1912 line - side device. the microdaa integrates all codec and daa functions necessary to achieve reliable pstn connection worldwide. the microdaa uses a small pulse transformer, which can achieve more than 6 kv isolation. power may be supplied along with data through this barrier interface to achieve superior performance i n weak loop current conditions. inherently immune to rfi and other forms of common mode interference, the patented microdaa technology achieves global daa compliance with unparalleled flexibility, reliability, and cost structure and requires less than 2 s quare inches of a single sided pcb. the microdaa supports caller id type i and ii, ring detection, tip/ring polarity reversal detection, hook switch control, pulse dialing, regulation of loop current (dc mask), configurable line impedance matching, line in use and parallel pickup detection. the microdaa integrates billing tone filters, external clock reference, audio monitor output, and requires only a small number of low cost and commonly available external components. the microdaa incorporates a configurable sample rate circuit to support soft modem and dsp - based implementations of all speeds up to v.92 (56 kbps). sampling rates from 7.2 khz to 16 khz can be easily supported. applications ? v.92 modems ? satellite set top boxes ? fax/multifunction peri pherals (mfp) ? point of sale terminals ? voicemail systems ? industrial and medical telemetry features ? meets fcc, etsi es 203 021 - 2, jate, net4 and other ptt standards ? configurable pstn termination ? up to 8 ma minimum line current operation ? 0 dbm transmit/rece ive full scale ? thd C 80 db ? 16 - bit codec up to 16 khz sample rate ? up to 56 kbps (v.92) performance ? configurable sample rates (7.2 C 16 khz) ? reference clock range of 9 - 40 mhz ? crystal frequency range of 9 - 27 mhz ? mafe i/f with master, slave and daisy chaining ? billing tone reject filter ? polarity reversal detection on - chip ? gpio for user - configurable i/o port ? call progress monitor ? 3.3 v operation ? industrial temperature range ( - 40 to +85 c) ? 6 kv isolation (73m1922) ? 4- 5 kv isolation (73m1822) ? 8x8 mm 42 - pin qfn (73m1822) ? 20 - pin tssop or 5x5 mm 32 - pin qfn (73m1922) ? rohs compliant (6/6) lead - free package downloaded from: http:///
73m1822/73m1922 data sheet ds_1x22_001 2 rev 1.6 table of contents 1 introduction ...................................................................................................................................... 6 2 pin out ................................................................................................................................................ 8 2.1 73m1902 20 - pin tssop pinout ............................................................................................... 8 2.2 73m1912 20 - pin tssop pinout ............................................................................................. 10 2.3 73m1902 32 - pin qfn pinout ................................................................................................ . 11 2.4 73m1912 32 - pin qfn pinout ................................................................................................ . 13 2.5 73m1822 pinout ..................................................................................................................... 15 2.6 exposed bottom pad on 73m1x66b qfn packages .............................................................. 16 3 electrical characteristics and specifications ................................................................................ 17 3.1 isolation barrier characteristics .............................................................................................. 17 3.2 electrical specifications ......................................................................................................... 17 3.2.1 absolute maximum ratings .......................................................................................... 17 3.2.2 recommended operating conditions ........................................................................... 17 3.2.3 dc characteristics ........................................................................................................ 18 3.3 s erial interface timing specification ...................................................................................... 19 3.4 analog specifications ............................................................................................................. 19 3.4.1 dc specifications ......................................................................................................... 19 3.4.2 call progress monitor ................................................................................................... 20 3.5 73m1x22 line - side electrical specifications (73m1912) ......................................................... 22 3.6 reference and regulation ..................................................................................................... 22 3.7 ac signal levels ................................................................................................................... 22 3.8 dc transfer characteristics ................................................................................................... 23 3.9 transmit path ........................................................................................................................ 24 3.10 receive path ......................................................................................................................... 25 3.11 transmit hybrid cancellation ................................................................................................ . 26 3.12 receive notch filter ............................................................................................................... 26 3.13 detectors ............................................................................................................................... 27 3.13.1 over - voltage detector ................................................................................................ . 27 3.13.2 over - current detector ................................................................................................ . 27 3.13.3 under - voltage detector ............................................................................................... 27 3.13.4 ove r- load detector ..................................................................................................... 27 4 applications information ................................................................................................................ 28 4.1 example schematic of the 73m1922 and 73m1822 ................................................................ 28 4.2 bill of materials ...................................................................................................................... 30 4.3 over - voltage and emi protection ........................................................................................... 31 4.4 isolation barrier pulse transformer ........................................................................................ 32 5 control and status registers ......................................................................................................... 33 5.1 line - side device register polling .......................................................................................... 36 6 hardware control functions .......................................................................................................... 37 6.1 device revision ..................................................................................................................... 37 6.2 interrupt control ..................................................................................................................... 37 6.3 power management ............................................................................................................... 38 6.4 device clock management .................................................................................................... 38 6.5 gpio registers ...................................................................................................................... 39 6.6 call progress monitor ............................................................................................................ 40 7 clock and sample rate management ............................................................................................ 41 7.1 c lock generation with hic (73m1902) ................................................................................... 41 7.2 crystal oscillator .................................................................................................................... 41 7.3 pll prescaler ........................................................................................................................ 42 7.4 pll circuit ............................................................................................................................. 42 7.5 pll system timing control .................................................................................................... 45 8 mafe serial interface ..................................................................................................................... 46 8.1 data and control frame formats ........................................................................................... 46 8.2 data and control frame timing ............................................................................................. 47 8.3 serial clock operation ........................................................................................................... 48 downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 3 8.4 microdaa in master/slave configuration ............................................................................... 49 8.5 73m1x22 reset ..................................................................................................................... 49 8.6 73m1x22 in daisy chain configuration ................................................................................... 50 8.7 mafe configuration registers ............................................................................................... 51 8.8 slave registers ...................................................................................................................... 51 9 signal processing ........................................................................................................................... 52 9.1 transmit path signal processing ........................................................................................... 52 9.1.1 gener al description ...................................................................................................... 52 9.1.2 total transmit path response ...................................................................................... 52 9.1.3 73m1x22 transmit spectrum ........................................................................................ 53 9.2 receive path signal processing ............................................................................................ 53 9.2.1 general description ...................................................................................................... 53 9.2.2 total receive path response ....................................................................................... 54 9.3 signal control functions ........................................................................................................ 55 9.3.1 transmit and receive level control ............................................................................. 55 10 barrier information ......................................................................................................................... 57 10.1 isolation barrier ...................................................................................................................... 57 10.2 barrier powered options ........................................................................................................ 57 10.2.1 barrier powered operation .......................................................................................... 57 10.2.2 line powered operations ............................................................................................ 57 10.3 synchronization of the barrier ................................................................................................ 57 10.4 auxiliary a/d converter .......................................................................................................... 58 10.5 auto - poll ................................................................................................................................ 58 10.6 barrier control functions ....................................................................................................... 59 10.7 line - side device operating modes ........................................................................................ 60 10.8 fail - safe operation of the line - side device ........................................................................... 60 11 configurable direct access arrangement (daa) .......................................................................... 61 11.1 pulse dialing .......................................................................................................................... 61 11.2 dc termination ...................................................................................................................... 61 11.2.1 current limit detection ................................................................................................ 63 11.3 ac termination ...................................................................................................................... 63 11.4 billing tone rejection ............................................................................................................ 64 11.5 trans - hybrid cancellation ...................................................................................................... 65 11.6 direct access arrangement contro l functions ....................................................................... 65 11.7 international register settings table for dc and ac terminations ......................................... 69 12 line sensing and status ................................................................................................................ 70 12.1 auxiliary a/d converter .......................................................................................................... 70 12.2 ring detection ....................................................................................................................... 70 12.3 line in use de tection (liu) .................................................................................................... 70 12.4 parallel pick up (ppu) ........................................................................................................... 70 12.5 polarity reversal detection .................................................................................................... 70 12.6 off - hook detection of caller id type ii ................................................................................... 70 12.7 voltage and current detection ............................................................................................... 71 12.8 under voltage det ection (uvd) ............................................................................................. 71 12.9 over voltage detection (ovd) ............................................................................................... 71 12.10 ac signal over load detection .............................................................................................. 71 12.11 over current detection (oid) ................................................................................................ . 71 12.12 line status functions control functions ................................................................................ 72 13 loopback and testing modes ........................................................................................................ 75 14 performance ................................................................................................................................... 77 14.1 dc vi characteristics ............................................................................................................. 77 14.2 receive ................................................................................................................................ . 78 15 package layout .............................................................................................................................. 79 16 ordering information ...................................................................................................................... 81 17 contact information ........................................................................................................................ 81 revision history ..................................................................................................................................... 82 downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 4 rev. 1.6 figures figure 1: simple 73m1x22 reference block dia gram .................................................................................. 6 figure 2: 73m1902 20 - pin tssop pinout ................................................................................................... 8 figure 3: 73m1912 20 - pin tssop pinout ................................................................................................ . 10 figure 4: 73m1902 32 - pin qfn pinout ..................................................................................................... 11 figure 5: 73m1912 32 - pin qfn pinout ..................................................................................................... 13 figure 6: 73m1822 42 - pin p inout .............................................................................................................. 15 figure 7: mafe timing diagram ............................................................................................................... 19 figure 8: call progress monitor frequency response ............................................................................... 20 figure 9: demo board circuit connecting aout to a speaker .................................................................. 20 figure 10: recommended circuit for the 73m1922 ................................................................................... 28 figure 11: recommended circuit for the 73m1822 ................................................................................... 29 figure 12: suggested over - voltage protection and emi suppression circuit ............................................. 31 figure 13: clock generation block diagram (assumes 8 khz sample rate) ............................................... 41 figure 14: crystal oscillator with configurable load current ..................................................................... 41 figure 15: prescaler block diagram .......................................................................................................... 42 figure 16: pll block diagram .................................................................................................................. 42 figure 17: serial port timing diagra m ...................................................................................................... 46 figure 18: data and control frames timing diagram ................................................................................ 47 figure 19: control frame position versus spos ....................................................................................... 48 figure 20: sclk and fs with sckm = 0 ................................................................................................... 48 figure 21: example connections for master and slave operation ............................................................. 49 figure 22: master/slave serial timing diagram ........................................................................................ 49 figure 23: daisy chaining a master and two slaves ................................................................................ 50 figure 24: timing diagram with one master and two slaves .................................................................... 50 figure 25: transmit path overall frequency response to fs (8 khz) ........................................................ 52 figur e 26: pass - band response of the transmit path .............................................................................. 52 figure 27: transmit spectrum to 32 khz ................................................................................................... 53 figure 28: overall frequency response of the receive path .................................................................... 54 figure 29: pass - band response of the overall receive path .................................................................... 54 figure 30: line - side device ac and dc circu its ....................................................................................... 60 figure 31: dc - iv characteristics ............................................................................................................... 61 figure 32: tip - ring voltage versus current using different dciv settings ................................................ 62 figure 33: voltage versus current in the seize mode is the same for all dciv sett ings ............................ 63 figure 34: magnitude response of ipmf, acz=01 ( e tsi es 203 021 - 2) .................................................. 64 figure 35: magnitude response of billing tone notch filter ..................................................................... 64 figure 36: loopback modes highlighted ................................................................................................... 75 figure 37: off - hook tip and ring dc characteristics ................................................................................ 77 figure 38: es 203 021 - 2 dc mask with current limit enabled .................................................................. 77 figure 39: australian hold state characteristics ....................................................................................... 78 figure 40: return loss ............................................................................................................................. 78 f igure 41: 20 - pin tssop package dimensions ........................................................................................ 79 figure 42: 32 - pin qfn package dimensions ............................................................................................ 79 figure 43: 42 - pin qfn package dimension s ............................................................................................ 80 downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 5 tables table 1: 73m1902 20 - pin tssop pin definitions ........................................................................................ 8 table 2: 73m1912 20 - pin tssop pin definiti ons ...................................................................................... 10 table 3: 73m1902 32 - pin qfn pin definitions .......................................................................................... 11 table 4: 73m1912 32 - pin qfn pin definitions .......................................................................................... 13 table 5: 73m1822 pin definitions ............................................................................................................. 15 table 6: isolation barrier characteristics at 8 khz sample rate ................................................................ 17 table 7: absolute maximum device ratings ............................................................................................. 17 table 8: recommended operating conditions .......................................................................................... 17 table 9: dc characteristics ...................................................................................................................... 18 table 10: serial data port timing at 8 khz sample rate ........................................................................... 19 table 11: reference voltage specifications .............................................................................................. 19 table 12: component values for the speaker driver ................................................................................. 20 table 13: call progress monitor specification ........................................................................................... 21 table 14: line - side absolute maximum ratings ....................................................................................... 22 table 15: vbg specifications ................................................................................................................... 22 table 16: maximum transmit lev els ......................................................................................................... 22 table 17: maximum dc transmit levels ................................................................................................... 23 table 18: transmit path ............................................................................................................................ 24 table 19: receive path ............................................................................................................................ 25 table 20: transmit hybrid cancellation characteristics ............................................................................. 26 table 21: receive notch filter .................................................................................................................. 26 table 22: over - voltage detector ............................................................................................................... 27 table 23: over - current detector ............................................................................................................... 27 table 24: under - voltage detector ............................................................................................................. 27 table 25: over - load detector ................................................................................................................... 27 table 26: reference bill of materials for 73m1822/73m1 922 ..................................................................... 30 table 27: reference bill of materials for figure 12 .................................................................................... 31 table 28: compatible pulse transformer sources .................................................................................... 32 table 29: transformer characteristics ...................................................................................................... 32 table 30: control and status register map ............................................................................................... 33 table 31: alphabetical bit map ................................................................................................................. 34 table 32: clock generation register settings for fxtal = 27 mhz ............................................................. 43 table 33: clock generation register settings for fxtal = 24.576 mhz ....................................................... 43 table 34: clock generation register settings for fxtal = 9.216 mhz ......................................................... 43 table 35: clock generation register settings for fxtal = 24.000 mhz ....................................................... 44 table 36: clock generation register settings for fxtal = 25.35 mhz ......................................................... 44 table 37: pll system timing controls ..................................................................................................... 45 table 38: behavior of sclk under sckm ................................................................................................ . 48 table 39: signal control functions ........................................................................................................... 55 table 40: transmit gain control ............................................................................................................... 55 table 41: receive gain control ................................................................................................................ 56 table 42: barrier control functions ........................................................................................................... 59 table 43: trans - hybrid cancellation ......................................................................................................... 65 table 44: daa control functions .............................................................................................................. 65 table 45: recommended register settings for international compatibility ................................................ 69 table 46: line sensing control functions ................................................................................................ . 72 table 47: loopback modes ....................................................................................................................... 75 table 48: loopback controls .................................................................................................................... 76 table 49: order numbers and packaging marks ....................................................................................... 81 downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 6 rev. 1.6 1 introduction the 73m1922 microdaa is a two - device chip set that consists of a 73m1902 host - side device and a 73m1912 line - side device that can be used in any voice - band pstn telephone interface applicati on requiring a codec. the 73m1822 is a single - package microdaa with the same interfaces. each connects directly between a host processor and the telephone network with a low - cost pulse transformer to provide the required high - voltage isolation. a few lo w- cost components complete the interface to the network. the pulse transformer transmits encoded digital data rather than analog signals as wi th other transformer designs. data is transmitted and received without the usual degradation from common mode noise and magnetic coupling typical of other capacitive and voice - band transformer techniques. the data stream passed between the host - side and line - side devices includes the media stream data, control, status and clocking information. the data sheet describes both the 73m1922 and 73m1822, which will be collectively re ferred to as the 73m1x22 in this document. the host - side device uses a serial data port for transferring transmit and receive data, statu s and control information to a host. this interface is compatible with most dsp and high - performance processor synchronous serial codec interfaces. all media stream data and control information between the host - side device and line - side device of the 73m1822 and 73m1922 are transferred across the pulse tran sformer. clocking information used by the line - side device is embedded in the bit stream received from the host - side device and reconstructed by the line - side device of the 73m1822 or 73m1922. on start up, the host - side device provides power to the line - side device through the transformer. after going off - hook, the line - side device is capable of being powered from the pstn network. the only physical connections between the devices are the primary side of the pulse tr ansformer that is connected to the h ost - side device and the secondary side to the line - side device. figure 1 shows a reference block diagram of the 73m1922 connected by a pulse transformer and examp le external line interface circuitry shown for clarification. prm modem side barrier interface (msbi) mafe interface transmit interpolation filter (tif) receive decimation filter (rdf) txdata rxdata prp txd rxd ctl sta host-side device tbs digital sigma delta modulator (dsdm) scm line side barrier interface (lsbi) receive analog front end (rxafe) sinc3 filter on-chip line interface circuit transmit analog front end (txafe) rbs tip ring scp aux a/d sta txa rxa off-chip line interface circuit ring buffer line-side device 73m1902 73m1912 figure 1 : simple 73m1x22 reference block diagram the host - side device (73m1902) consists of: 1. modem analog front end (mafe) interface block 2. transmit interpolation filter (tif) 3. receive decimation filter (rdf) 4. modem - side barrier interface circuit (msbi) downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 7 the line - side device (73m1912 / 73m1822) consists of: 1. digital sigma delta modulator (dsdm) 2. transmit analog front end (txafe) 3. receive analog front end (rxafe) including sigma delta modulator (asdm) 4. sinc^3 filt er (sinc3) 5. on - chip line interface circuit (onlic) 6. line - side barrier interface circuit (lsbi) the transmit data (txdata) is interpolated up within tif (transmit interp olation filter) from the sampling frequency (fs) to twice the sampling frequency resultin g in txd. control information (ctl) is time - division multiplexed with txd, serialized within msbi, and sent across the barrier to 73m1912 lic (line interface circuitry). this is then received and pro cessed within lsbi and separated into txd and ctl. txd is digitally sigma - delta modulated to form a serialized transmit bit stream (tbs). the tbs is d/a converted for final transmission to the line. c tl is used to control various features of the line - side device. on the receive side, the received analog signal from the line is sigma - delta modulated to form a serialized receive bit stream (rbs). rbs is decimated down to twice the sampling frequen cy as rxd and time - division multiplexed with status information (sta) from the auxiliary a/d regarding line condition in lsbi block and transmitted to the host - side device. the msbi processes this data and separates it into rxd and sta. rxd is further decimated to down to fs and sent to the host through th e mafe interface. sta is sent to the host through the mafe interface using a different time sl ot. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 8 rev. 1.6 2 pinout the 73m1922 consists of two devices, the 73m1902 and the 73m1912, which are available a s 20 - pin tssop packages and as 32 - pin qfn package sets. 2.1 73m1902 20 - pin tssop pinout figure 2 sh ows the 73m1902 20 - pin tssop pinout. 73m190 2 12 3 4 5 67 8 9 10 11 12 13 14 15 16 17 18 19 20 f sd fs vnd vpd/vppll oscin/mclk oscout vnpll/vna aout type vpa/vpm vnmvnt sdout sclk i nt / rg dt vnd vpt/vpd m/ s prm prp sdin figure 2 : 73m1902 20 - pin tssop pinout table 1 describes the pin functions for the device. decoupling capacitors on the p ower supplies should be included for each pair of supply pins. table 1 : 73m1902 20 - pin tssop pin definitions pin number pin name type description 1 fsd o frame synchronization ( fs ) delayed 2 fs o frame synchronization 3 vnd gnd negative digital ground 4 vpd/vppll pwr positive digital/pll supply 5 oscin/mclk i crystal oscillator circuit input pin. input from an external clock source. crystal frequency range is 9 mhz C 27 mhz. 6 oscout o crystal oscillator output pin. (n.c. wit h external oscillator) 7 vna/vnpll gnd negative analog/pll ground 8 aout o call progress audio output 9 type i type of frame sync. 0 = late (mode0), 1 = early (mode1). weak - pulled high C default = early. 10 vpa/vpm pwr positive analog supply 11 vnm/ vnt gnd negative barrier interface supply / negative transformer supply 12 m/ s i master/slave control, reset at a transition. 13 prm i/o pulse transformer primary minus downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 9 14 prp i/o pulse transformer primary plus 15 vpd pwr positive digital supply, posit ive transformer supply 16 int / rgdt o ring detection indicator or other interrupts open drain 17 sclk o serial interface clock. with continuous sclk selected, frequency = 256 ? fs (=1.8432mhz for fs=7.2khz, 2.048mhz for fs=8khz) 18 vnd gnd negative digita l ground 19 sdin i serial data input (or output from the controller to 73m1902) 20 sdout o serial data output (or input to the controller from 73m1902) downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 10 rev. 1.6 2.2 73m1912 20 - pin tssop pinout figure 3 shows the 73m1912 20 - pin tssop pinout. 73m1912 12 3 4 5 67 8 9 10 11 12 13 14 15 16 17 18 19 20 dci rgn rgp ofh vnd/vnx scp mid vpx sre srb vbg dcs dcd txm rxm rxp acs vnx/vns vpd/vps dcg figure 3 : 73m1912 20 - pin tssop pinout table 2 describes the pin functions for the device. decoupling capacitors on the power supplies should be included for each pair of supply pins. table 2 : 73m1912 20 - pin tssop pin definitions pin number pin name t ype description 1 dci i dc loop input 2 rgn i ring detect negative voltage input 3 rgp i ring detect positive voltage input 4 ofh o off - hook control 5 vnd/vnx gnd digital/analog negative supply voltage 6 scp i/o positive side of the secondary pulse transformer winding 7 mid i/o charge pump midpoint 8 vpx pwr supply from the barrier, connect to vpd 9 sre i voltage regulator sense 10 srb o voltage regulator drive 11 vbg o vbg bypass, c onnect to 0.1 f capacitor to vn s 12 acs i ac current sense 13 vnx/vns gnd digital/analog negative supply voltage 14 vpd/vps pwr digital/analog positive supply voltage 15 rxp i rec eive plus C signal input 16 rxm i receive minus C signal input 17 txm o transmit minus C signal output 18 dcd o dc loop drive 19 dcs i dc loop current sense 20 dcg o dc loop drive downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 11 2.3 73m1902 32 - pin qfn pinout fi gure 4 shows the 73m1902 32 - pin qfn pinout. 6 7 8 9 5 4 3 2 1 17 18 19 20 2423 22 21 1011 12 13 14 15 16 32 31 3029 28 27 26 25 vnd gpio5 gpio4 vpd/vppll oscin/mclk oscout vnpll vna vnd sclk i nt / rg dt lev vpt/vpd rs t prp prm vbg aout tout type vpa/vpm sclkm vnm/vnt m/ s 73m1902 sdin gpio6 vnd f s f s d vpd sdout gpio7 figure 4 : 73m1902 32 - pin qfn pinout table 3 describes the pin functions for the device. decoupling capacitors on th e power supplies should be included for each pair of supply pins. table 3 : 73m1902 32 - pin qfn pin definitions pin number pin name type description 1 vnd gnd negative digital ground 2 gpio5 i/o configurable digital input/output pi ns 3 gpio4 i/o configurable digital input/output pins 4 vpd/vppll pwr positive digital/pll supply 5 oscin/mclk i crystal oscillator circuit input pin. input from an external clock source. crystal frequency range supported is 9 mhz C 27 mhz. 6 oscout o crystal oscillator output pin. (n.c. with external oscillator) 7 vna/vnpll gnd negative analog/pll ground 8 vna/vnpll gnd negative analog/pll ground 9 vbg o band gap voltage reference monitor 10 aout o call progress audio output 11 tout o digital test output 12 type i type of frame sync. 0 = late (mode0), 1 = early (mode1). weak - pulled high C default = early. 13 vpa/vpm pwr positive analog supply downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 12 rev. 1.6 pin number pin name type description 14 sckm i controls the sclk behavior after fs . weak - pulled high C default = continuous sclk 15 vnm/v nt gnd negative barrier interface/transformer supply 16 m/ s i master/slave control, reset at a transition 17 prm i/o pulse transformer primary minus 18 prp i/o pulse transformer primary plus 19 rst i factory test mode C leave open 20 vpd pwr positive digital supply, positive transformer supply 21 lev o test output (cmos level) 22 int / rgdt o ring detection indicator or other interrupts. open drain 23 sclk o serial interface clock. with continuous sclk selected, frequency = 256 ? fs (=1.8432mhz for fs= 7.2khz, 2.048mhz for fs=8khz) 24 vnd gnd negative digital ground 25 sdin i serial data input (or output from the controller to 73m1902) 26 sdout o serial data output (or input to the controller from 73m1902) 27 vpd pwr positive digital supply, positive transformer supply 28 fsd o fs delayed 29 fs o frame synchronization 30 vnd gnd negative digital ground 31 gpio7 i/o configurable digital input/output pins 32 gpio6 i/o configurable digital input/output pins downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 13 2.4 73m1912 32 - pin qfn pinout figure 5 shows the 73m1912 32 - pin qfn pinout. 6 7 8 9 5 4 3 2 1 17 18 19 20 2423 22 21 1011 12 13 14 15 16 32 31 3029 28 27 26 25 cko ofh cki vnd/vnx scp mid scm vpx rst dcd tst txm sacin rxm rxp vps rct byp sre srb vns vbg acs vns 73m1912 dcs gpo gpi vns rgp rgn dci dcg figure 5 : 73m1912 32 - pin qfn pinout table 4 describes the pin functions for the devic e. decoupling capacitors on the power supplies should be included for each pair of supply pins. table 4 : 73m1912 32 - pin qfn pin definitions pin number pin name t ype description 1 cko o test point for recovered clock 2 ofh o off - hook control 3 cki i test input for clock 4 vnd/vnx gnd digital/analog negative supply voltage 5 scp i/o positive side of the secondary pulse transformer winding 6 mid i/o charge pump midpoint 7 scm i/o negative side of the secondary pulse transforme r winding 8 vpx pwr supply from the barrier side, connect to vpd 9 rct i external rectification C disables internal rectifier when low, leave open 10 byp i factory test mode C leave open 11 sre i voltage regulator sense 12 srb o voltage regulator dr ive 13 vns gnd analog/digital negative supply voltage 14 vbg o vbg bypass, connect to 0.1f capacitor to vps 15 acs i ac current sense 16 vns gnd analog/digital negative supply voltage downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 14 rev. 1.6 pin number pin name t ype description 17 vps pwr analog/digital positive supply voltage 18 rxp i recei ve plus C signal input 19 rxm i receive minus C signal input 20 sacin i caller id mode ac impedance connection 21 txm o transmit minus C transhybrid cancellation output 22 tst i factory test mode C leave open 23 rst i factory test mode C leave open 24 dcd o dc loop drive 25 dcs i dc loop current sense 26 dcg o dc loop drive 27 dci i dc loop input 28 rgn i ring detect negative voltage input 29 rgp i ring detect positive voltage input 30 vns gnd analog/digital negative supply voltage 31 gpi i g eneral purpose input (test pin) 32 gpo o general purpose output (test pin) downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 15 2.5 73m1822 pinout figure 6 shows the 73m1822 42 - pin pinout. 73 m18 22 prm prp vpd/vpt i nt / rg dt sclk sdin sdout f sd fs vnd gpio vnd vpd/vppll oscin/mclk oscout vna vna/vnpll aout vpa/vpm vna m/ s sre srb vbg acs vns vps rxp rxm txm dcd dcs dcg dci rgn rgp ofh m20bp scp mid vpx vnd/vnx 1 23 4 5 6 7 8 9 10 20 1112 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 30 31 32 33 3534 36 37 38 39 40 41 42 figure 6 : 73m1822 42 - pin pinout table 5 describes the pin functions for the device. decoupling capacitors on the power supplies should be included for each pair of supply pins. table 5 : 73m1822 pin definitions pin number pin nam e t ype description 1 prp i/o pulse transformer primary plus 2 prm i/o pulse transformer primary minus 3 vpd/vpt pwr positive digital/transformer supply 4 int / rgdt o ring detection indicator or other interrupts open drain 5 sclk o serial interface clock. with continuous sclk selected, frequency = 256 ? fs (=1.8432 mhz for fs=7.2 khz, 2.048 mhz for fs=8 khz) 6 sdin i serial data input (or output from the controller to the 73m1822) 7 sdout o serial data output (or input to the controller from the 73m1822 ) 8 fsd o fs delayed 9 fs o frame synchronization 10 vnd gnd negative digital ground 11 gpio i/o configurable digital input/output pins 12 vnd gnd negative digital ground 13 vpd/vppll pwr positive digital supply downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 16 rev. 1.6 pin number pin nam e t ype description 14 oscin/mclk i crystal oscillator ci rcuit input pin. input from an external clock source. crystal frequency range supported is 9 mhz C 27 mhz. 15 oscout o crystal oscillator output pin. (n.c. with external oscillator) 16 vna/vnpll gnd negative pll ground 17 vna gnd negative analog groun d 18 aout o call progress audio output 19 vpa/vpm pwr positive analog supply 20 vnm/vnt gnd negative transformer supply 21 m/ s i master or slave selection / reset - active during transition 22 sre i s/sh regulator sense 23 srb o s/sh regulator drive 24 vbg o vbg bypass, connect to 0.1uf capacitor to vps 25 acs i ac current sense 26 vns gnd lic analog/digital negative ground 27 vps pwr lic analog/digital positive supply voltage 28 rxp i receive plus - signal input 29 rxm i receive minus - signal i nput 30 txm o transmit minus - signal output 31 dcd o dcd for integrated darlington 32 dcs i dc loop current sense 33 dcg o dc loop drive 34 dci i dc loop input 35 rgm i ring minus voltage input 36 rgp i ring plus voltage input 37 ofh o off - hook co ntrol 38 m20bp i substrate connection. connect to vnx. 39 vnd/vnx gnd lic digital/analog negative ground 40 scp i/o positive side of the secondary pulse transformer winding 41 mid i/o charge pump - normally left open 42 vpx pwr lic supply from the bar rier side 2.6 exposed bottom pad on 73m1x66b qfn packages the 73m1822 and 73m1922 qfn packages have exposed pads on the underside that are intended for device manufacturing purposes. these exposed pads are not intended for thermal r elief (heat dissipation) and should not be soldered to the pcb. soldering of the exposed pad could also compromise electrical isolation/insulation requirements for proper voltage is olation. avoid any pcb traces or through - hole vias on the pcb beneath the exposed pad area. downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 17 3 elec trical characteristics and specifications 3.1 isolation barrier characteristics table 6 provides the characteristics of the 73m1x22 isolation barrier. table 6 : isolation barrier characteristics at 8 khz sample rate parameter rating barrier frequency 768 khz data transfer rate across the barrier 1.536 mbps 3.2 electrical specifications this section provides the absolute maximum ratings, the recommended operating con ditions and the dc characteristics. 3.2.1 absolute maximum ratings table 7 lists the maximum operating conditions for the 73m1x22. permanent device damag e may occur if absolute maximum ratings are exceeded. exposure to the extremes of the absolute maximum rating for extended pe riods may affect device reliability. table 7 : absolute maximum device ratings parameter min max unit supply voltage - 0.5 4.0 v pin input voltage (except oscin) - 0.5 6.0 v pin input voltage (oscin) - 0.5 to vdd 0.5 v 3.2.2 recommended operating conditions function operation should be restricted to the recommended operating conditions spec ified in table 8. table 8 : recommended operating conditions parameter min max unit supply voltage (vdd) with respect to vss 3.0 v 3.6 v operating temperature 0 85 c downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 18 rev. 1.6 3.2.3 dc characteristics table 9 lists the 73m1x22 dc characteristics. table 9 : dc characteristics parameter condition min nom max unit inp ut low voltage vil C - 0.5 C 0.2 ? vdd v input high voltage (except oscin) vih1 C 0.7 vdd C 5.5 v input high voltage oscin vih2 C 0.7 vdd C vdd + 0.5 v output low voltage (except oxcout, fs , sclk, sdout) vol iol=4 ma C C 0.45 v output low voltage oscout volosc iol=3 ma C C 0.7 v output low voltage fs , sclk, sdout vol iol = 1ma C C 0.45 v output high voltage (except oscout, fs , fsd , sclk, sdout) voh ioh= - 4 ma vdd - 0.45 C C v output high voltage oscout vohosc ioh = - 3.0 ma vdd - 0.9 C C v output high v oltage fs , fsd , sclk, sdout voh ioh= - 1 ma vdd - 0.45 C C v input low leakage current iil1 vss < vin < vil1 10 C 40 a input high leakage current iih1 vih1 < vin < 5.5 C 1 a input leakage current oscin iil2 vss < vin < vil2 1 C 30 a input high leakage current oscin iih2 vih2 < vin < vdd 1 C 10 a idd current at 3.0 v C 3.6 v nominal at 3.3 v active digital current idd1 dig C C 1.0 1.5 ma active pll current idd1 pll C C 1.0 1.5 ma active analog current idd1 ana C C 12 17 ma idd total current* idd1 C C 15 20 ma idd total current* idd2 C C 20 30 ma idd current pwdn=1 idd2 C C 1.0 5 a idd current sleep=1 (ext ref clk) idd3 C C 0.5 1.0 ma idd current idl2=1 (ext ref clk) idd4 C C 10 15 ma idd current enfeh=0 (ext ref clk) idd5 C C 1.0 1. 5 ma *note: idd1 is with the secondary of the barrier left open. idd2 is with the secondary of the barrier connected to the 73m1912 fully powered. downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 19 3.3 serial interface timing specification the 73m1x22 has a synchronous serial interface, called the mafe interface, to tr ansfer data to and from a host. table 10 provides the timing specification for the mafe interface . table 10 : serial data port timing at 8 khz sample rate parameter min nom max unit sclk perio d (tsclk) C 1/1.536 mhz C ns sclk to fs delay (td1) C mode1 C C 20 ns sclk to fs delay (td2) C mode1 C C 20 ns sclk to sdout delay (td3) with 10 pf load C C 20 ns setup time sdin to sclk (tsu) 15 C C ns hold time sdin to sclk (th) 10 C C ns sclk to fs delay (td4) C mode 0 C C 20 ns sclk to fs delay (td5) C mode 0 C C 20 ns figure 7 : mafe timing diagram 3.4 analog specifications this section provides the electrical characterizations of the 73m1x22 analog ci rcuitry. 3.4.1 dc specifications vbg is to be connected to an external bypass capacitor with a minimum value of 0 .1 f. this pin is not intended for any other external use. table 11 : reference voltage specifications parameter test condition min nom max units vbg vdd=3.0 v C 3.6 v 0.9 1.19 1.4 v vbg noise 300 hz C 3.3 khz C - 86 - 80 dbm 600 vbg psrr 300 hz C 30 khz 40 C C db fs (mode1) fs (mode0) sdin sdout sclk downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 20 rev. 1.6 3.4.2 call progress monitor the call progress monitor monitors activities on the line. the audio output contai ns both transmit and receive data with a configurable level individually set by register 0x10. figure 8 shows the frequency response of the call progress monitor filter based upon the char acteristics of the device plus the exte rnal circuitry as shown. figure 8 : call progress monitor frequency response u1 njm2135 cd 1 -vin 4 v+ 6 gnd 7 vout1 5 vout2 8 vref1 2 vref2 3 aout vcc vcc r3 120k + c2 2.2uf ls1 intervox at-2308 c4 1uf r2 120k r1 120k c3 1uf c1 0.1uf figure 9 : demo board circuit connecting aout to a speaker table 12 : component val ues for the speaker driver quantity reference part description part 1 c1 ceramic capacitor 0 .1 f 1 c2 ceramic capacitor 2.2 f (optional) 2 c3, c4 ceramic capacitor 1 f 1 ls1 sound transducer speaker (intervox) 3 r1, r2, r3 1/8 w resistor 120 k 1 u1 audio amplifier njm2135 (new japan radio) all measurements are at the aout pin with cmvsel=0. note that when cmvsel=1, th e peak signal at aout is increased to approximately 1.11 vpk. downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 21 table 13 : call progress monitor specificatio n parameter test condition min nom max units aout for transmit 1 khz full swing code wor d at sdin pin cmrxg=11(mute) observe aout pin C C C C cmtxg=00 C 0.98 C vpk cmtxg=01 relative to cmtxg=00 C -6 C db cmtxg=10 relative to cmtxg=00 C - 12 C db cmtxg=11(mute) C mute C db aout transmit thd cmtxg=00 C 40 C db aout for receive 1. 0 vpk, 1 khz at the line or 0.5 vpk at rxp/rxm with rxg=10 (+6 db) cmtxg=11(mute) observe aout pin C C C C cmrxg=00 C 0.96 C vpk cmrxg=01 relative to cmrxg=00 C -6 C db cmrxg=10 relative to cmrxg=00 C - 12 C db cmrxg=11(mute) C mute C db aout re ceive thd cmrxg=00 C 40 C db aout output impedance C C 10 C k downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 22 rev. 1.6 3.5 73m1x22 line - side electrical specifications (73m1912) table 14 lists the absolute maximum ratings for the line side. operation outside these rating limits may cause permanent damage to this device. table 14 : line - side absolute maximum ratings parameter min max unit pin input voltage from vpx to vnx - 0.5 6.0 v pin input voltage (all other pins ) to vns - 0.5 4.0 v 3.6 reference and regulation table 15 lists the vbg specification s. vbg should be connected to an external bypass capacitor with a minimum value of 0.1f. this pin is not intended for any other external use. the following conditions apply: vpx=5 v; barrier powered mode; barrier data rate across the barrier=1.5 mbps; vbg connected to 0.1 f external cap. table 15 : vbg specifications parameter test condition min nom max units vbg see conditions above. C 1.19 C v vbg noise 300 hz C 3.3 khz C - 86* - 80 dbm 600 vbg psrr 300 hz C 30 khz 40 C C db vps vpx=5.5 v C 3.15 C v vps psrr vpx=4.5 v to 5.5 v C 40 C db 3.7 ac signal levels table 16 shows the maximum transmit levels that the 73m1912 line - side device is capable of delivering. table 16 : maximum transmit levels transmit type maximum level at the line ( dbm) peak to rm s ratio rms voltage on the line (v) peak voltage on the line (v) v.90 - 12.0 4 0.195 0.778 qam - 7.3 2.31 0.334 0.772 dpsk - 5.1 1.81 0.431 0.779 fsk - 3.0 1.41 0.548 0.775 dtmf (high tone) - 7.8 1.41 0.316 0.446 dtmf (low tone) - 9.8 1.41 0 .251 0.354 downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 23 3.8 dc transfer characteristics table 17 lists the maximum dc output levels. all tests are driven at pin dci and measured at pin dcs. dcen=1 and pin dci is shorted to pin dcs. ilm= 0 unless stated otherwise . table 17 : maximum dc transmit levels parameter test condition min nom max units v dcon (dc "on" voltage) dciv=00 0. 69 0. 73 0. 78 v dciv=01 0. 89 0.94 0.99 v dciv=10 1. 01 1. 06 1. 11 v dciv=11 1. 13 1. 18 1. 23 v with enac=0 dciv=xx 0. 27 0. 31 0. 35 v dc gain v dcon ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 25 3.10 receive path table 19 list the r eceive path characteristics. all test inputs are driven by a signal generator at the collector of q5. table 19 : receive path parameter test condition min nom max units differential input resistance rxp/rxm C 1000 C k input level differential, rxp/rxm C 1.0 1.16 vpk input level common mode, rxp/rxm C 1.37 v overall ? adc modulation gain inclusive of 73m1902 processing normalized to vref=1.40 v. rxg=00; rxm=0 43 47 51 v/bit offset voltage C 13 70 mv rx gain r xg=00 C 0 C db rxg=01 2 3 4 db rxg=10 5 6 7 db rxg=11 8 9 10 db rxbst=1, rxg=00 17.5 19.5 21.0 db overall receive frequency response inclusive of 73m1902 processing relative to 1 khz C C C 0.3 khz C 3.3 khz - 0.25 0 +0.25 db fs (8 khz) C - 75 C db idle noise 300 hz C 4 khz C - 81 C dbm thd rxg[1:0]=00 C - 80 C db rxbst=1 C - 60 C intermod distortion 1.0 khz and 1.2 khz summed 300 hz C 4 khz C - 80 C db crosstalk 1 vpk 1 khz sine wave at txp; fft on rx adc samples, first four harmonics refl ected to the line. C - 85 C dbm cmrr rxp=rxm 1 vpk 40 C C db psrr - 30 dbm signal at vpx in barrier powered mode; 300 hz C 30 khz. C C 40* db downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_001 26 rev. 1.6 3.11 transmit hybrid cancellation table 20 lists the transmit hybrid cancellation characteristics. unless stat ed otherwise, test conditions are: acz=00 (600 termination), then=1, aten=1, daa=01, txbst=0. txm is externally fed back into the 73m1912 to effect cancellation of transmit signal. table 20 : transmit hybrid c ancellation characteristics parameter test condition min nom max units transmit hybrid cancellation measure rxd in hic C 26 C db offset voltage 50% 1s density C 25 50 mv ac swing 1 khz sinusoid at tip and ring 0.85 0.95 1.05 vpk idle noise 300 hz C 4 khz at tip and ring C - 81 C dbm 3.12 receive notch filter table 21 lists the receive notch filter characteristics. all measurements taken with rlpnen=1, txen=0, rxg=00, aten=1. rxp is driven with 1 vpk signal. table 21 : receive notch filter parameter test condition min nom max unit magnitude response rlpnh = 0 (12 khz notch) 300 hz C 0.0 C db 1 khz C +0.03 C db 3 khz C +0.04 C db 16 khz - 20 - 50 C db passband ripple (0.3 khz C 3.4 khz) C +/ - 0.15 C db delay C 28.8 C s 300 hz C 28.93 C s 1 khz C 30.25 C s 3 khz C 41.62 C s 12 khz C 9.95 C s magnitude response rlpnh = 1 (16 khz notch) 300 hz C 0.0 C db 1 khz C +0.04 C 3 khz C +0.11 C db 12 khz - 20 - 50 C db passband ripple (0.3 khz C 3.4 khz) C +/ - 0.15 C db delay C 30.53 C s 300 hz C 30.66 C s 1 khz C 31.93 C s 3 khz C 42.26 C s 16 khz 4.74 C s downloaded from: http:/// ds_1x22_001 73m1822/73m1922 data sheet rev. 1.6 27 3.13 detectors this section provides electrical characteristics for the following detec tors: ? over - voltage. ? over - current. ? under - voltage. ? over -l oad. 3.13.1 over - voltage detector the values in table 22 were measured in idl2 mode between rgp and rgn. table 22 : over - voltage detector parameter test condition min nom max unit over voltage levels ovdth=0 0.5 2 0.6 0.68 v ovdth=1 0.59 0.7 0.77 v 3.13.2 over - current detector the values in table 23 were measured in barrier powered mode. table 23 : over - current detector parameter test condition min nom max unit over current level measured at dcs. 0.85 0.96 1.10 v 3.13.3 under - voltage detector the values in table 24 were measured in barrier powered mode. in the recommended schematic (see figure 10 and figure 11 ), disconnect q5 collector and connect to an external power supply, vpe, t hrough a 600 resistor. table 24 : under - voltage detector parameter test condition min nom max unit under voltage detect measure vpe when uvd is detected as vpe is decreased. 5.6 C 6.5 v 3.13.4 over - load detector the values in table 25 were measured in barrier powered mode. table 25 : over - load detector parameter test condition min nom max unit over load level mea sured at dci with 1 khz. 0.6 0.75 0.9 vpk downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 28 rev 1.6 4 applications information this section provides general usage information for the design and implementation of t he 73m1x22. the documents listed in se ction error! reference source no t found. provide more detailed information. al ways consult with teridian semiconductor for the latest recommendations before finalizing a design. 4.1 example schematic of the 73m1922 and 73m1822 figure 10 shows a reference schemati c for the 73m1922. figure 11 shows a reference schematic of the 73m1822. note that minor changes may occur to the reference material from time to time and the reader is encouraged to contact ter idian for the latest information . for more information about schematic and layout design, see the 73m1822/73m1922 schematic and layout guidelines . figure 10 : recommended circuit for the 73m1922 r69 100k* optional c13 15pf fsbd c31 1nf c33 0.1uf fs intb c28 1nf c15 0.1uf sdout c30 1nf vccvccvcc c17 0.1uf sdin c19 27pf c18 27pf y1 24.576mhz 1 3 2 4 c25 1nf sclk c14 15pf *r69 optional ti p ring + c4 10uf + c7 1uf r4 100k, 1% + c8 4.7uf r2 10m r6 100k, 1% c12 0.1uf u2 73m1912 ofh 4 vnd/vnx 5 scp 6 mi d 7 vpx 8 sre 9 srb 10 vbg 11 acs 12 vns 13 vps 14 r xp 15 r xm 16 txm 17 dcd 18 dce 19 dcb 20 dci 1 rgn 2 rgp 3 r5 8.2 + c21 3.3uf - + br1 hd04 4 1 3 2 c43 1nf t1 1 4 2 3 q4 mmbta92 1 3 2 c26 1nf c48 0.01uf + c22 3.3uf c38 0.1uf c24 nc (1nf, 3kv) r12 5.1k c3 0.022 (200v, 1206) c37 0.01uf c9 0.47uf + c32 3.3uf r11 3k r8 100k, 1% q2 mmbta42 1 3 2 r18 1k c5 100pf r3 412k, 1% q3 mmbta42 1 3 2 r52 200 r67 1m r66 1m u1 73m1902 fsbd 1 aout 8 vpt/vpd 15 ty pe 9 oscin 5 oscout 6 vpa/vpm 10 vnm/vnt 11 sclk 17 sdout 20 sdin 19 vnd 3 fs 2 vpd/vppll 4 vnpll 7 m/ s 12 prm 13 prp 14 int 16 vnd 18 r9 100k, 1% vns c10 0.47uf r10 255, 1% q5 mmbta06 1 3 2 d1 mmsz4710t1 q6 bcp56 1 2 3 4 c49 0.1uf c1 0.022(200v, 1206) vcc downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 29 figure 11 : recommended circuit for the 73m1822 c48 0.01uf d1 mmsz4710t1* vns c13 15pf c14 15pf r12 5.1k - + br1 hd04 4 1 3 2 c1 0.022uf (200v, 1206) r3 412k, 1% c25 1nf r11 3k r18 1k q3 mmbta42 1 3 2 q6 bcp56 1 2 3 4 q4 mmbta92 1 3 2 r8 100k, 1% r10 255, 1% r4 100k, 1% r6 100k, 1% q5 mmbta06 1 3 2 vps afeout q2 mmbta42 1 3 2 y1 24.576mhz 1 3 2 4 r52 200 c49 0.1uf + c4 10uf c33 0.1uf fsbd + c21 3.3uf t1 1 4 2 3 + c32 3.3uf c19 27pf c15 0.1uf + c22 3.3uf c37 0.01uf afein sclk r66 1m ringd c31 1nf isolation barrier + c7 1uf c12 0.1uf c38 0.1uf c43 1nf + c8 4.7uf u1 73m1822 prm 1 prp 2 vpd 3 int 4 sclk 5 sdin 6 sdout 7 fsbd 8 fs 9 vnd 10 gpio6 11 vnd 12 vpd 13 oscin 14 oscout 15 vnpll 16 vna 17 aout 18 vpa 19 vnm/vnt 20 m/ s 21 sre 22 srb 23 vbg 24 acs 25 vns 26 vpd/vps 27 rxp 28 rxm 29 txm 30 dcd 31 dce 32 dcb 33 dci 34 rgn 35 rgp 36 ofh 37 m20bp 38 vnd/vnx 39 scp 40 mi d 41 vpx 42 c3 0.022uf (200v, 1206) c28 1nf r67 1m c9 0.47uf vcc c24 nc (1nf, 3kv) r5 8.2 c17 0.1uf c5 100pf c30 1nf fs c10 0.47uf c18 27pf r2 10m ring ti p r9 100k, 1% vns vns c26 1nf optional vcc downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 30 rev 1.6 4.2 bill of materials table 26 provides the 73m1x22 bill of materials for the reference schematics provi ded in figure 10 and figure 11 . table 26 : reference bill of materials for 73m1822/73m1922 reference part description example source example mfr p/n br1 hd04 rectifier bridge, 0.8a, 400v diodes inc. hd04 -t c1, c3 0.022f 200v, x7r, 1206 panasonic ecj - 3fb2d223k c4 10f 6.3v, tantalum, 0805 avx, p anasonic tcp0j106m8r a c5 100pf 50v, ceramic, 0603 taiyo yuden umk107ch101jz -t c7 1f 6.3v, tantalum, 0805 rohm tcp0j105m8r c8 4.7f, 6.3v, x5r, 10%, ceramic, 0805 panasonic ecj - 2yb0j475k c9, c10 0.47f, 6.3v, x5r, 10%, ceramic, 0603 panasonic ecj - 1v b0j474k c12, c15, c17, c33, c38, c49 0.1f, 16v, x7r, 10%, ceramic, 603 panasonic, kemet c0603c104k8ractu c13, c14 15pf 50v, ceramic, 0603 panasonic ecj - 1vc1h150j c18, c19 27pf 50v, ceramic, 0603 panasonic ecj - 1vc1h270j c21, c22, c32 3.3f, 6.3v, x5r, 10%, ceramic, 0805 panasonic ecj - 2yb0j335k c24 nc (1nf, 3kv) c25, c26, c28, c30, c31, c43 1nf 10v, x7r, ceramic, 0603 panasonic c0603c102k8ractu c37, c48 0.01f, 50v, x7r, 10%, ceramic, 603 avx, panasonic, utc 06035c103kat2a d1 25v, 500mw z ener d iode on semi , diodes, inc. mmsz4710t1 q2, q3 a42, npn 300 v transistor sot23 diodes, central semi mmbta42lt1g q4 a92, pnp 300 v transistor sot23 diodes, on semi mmbta92lt1g q5 a06, npn 80 v transistor sot23 fairchild, on semi mmbta06lt1g q6 npn 80 v tr ansistor sot223 fairchild, on semi bcp56 r2 10m 1%, 1/8w resistor 0805 panasonic, yageo rc0603fr - 0710ml r3 412 k, 1%, 1/16w resistor 0603 panasonic erj - 3ekf4123v r4, r6, r8, r9 100k, 1%, 1/16w resistor 0603 panasonic erj - 3ekf1003v r5 8.2, 1%, 1/8w resi stor 0805 vishay crcw08058r20fnea r10 255, 1%, 1/16w resistor 0603 panasonic rc0603fr - 07255rl r11 3 k, 1/16 w resistor 0603 panasonic, yageo rc0603fr - 073k0l r12 5.1 k, 1/16 w resistor 0603 panasonic, yageo rc0603fr - 075k1l r18 1 k, 1/16w resistor 0603 p anasonic erj - 3ekf1001v r52 200, 1/16w resistor 0603 panasonic erj - 3ekf2000v r66, r67 1 m,1/8w resistor 0805 panasonic, yageo rc0805fr - 071ml r69* 100k typ. 5%, 1/10w resistor 0603 yageo rc0603jr - 07100kl t1 pulse transformer see table 28 . y1 24.576 mhz crystal (fundamental) ecs/abracon C * optional C see the 73m1822 / 73m 1922 schematic and layout guidelines for details. downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 31 4.3 over - voltage and emi protection over - voltage /over - current protection is required to meet worst - case conditions for target countries. ul1950, en60950, iec 60950, itu - t k.20/k.21 and gr - 1089 - core specifications define the protection requirements for many countries. a single design can be implemented to meet all these requirements. figu re 12 shows a recommended protection circuit topology. fuse (f1) should be rated for 600 v operation and the bidirectional thyristor (e1) should have a minimum break - over of 275 v and be able to survive a 100 a fast transient. in addition to over - voltag e and current protection, the line - interface designer should make provisions to prevent emi emissions and susceptibility. figure 12 also illustra tes how l1, l2, c35, c36 and c42 can provide this suppression. the ferrite beads, l 1 and l2, should be capable of passing 200 ma and have an impedance of 2000 at 100 mhz. c35, c36 and c42 should be 220 pf and rated for a breakdown voltage greater than the highest isolation voltage that is required for cou ntry compatibility. c35 and c36 should be returned to an earth ground. emi suppression is dependent on the phys ical design of the overall circuit and not all the suppression components may be needed in every d esign and application. the values shown are typical and should be optimized for a particular design. r t c35 220 pf, 3000 v c36 220 pf, 3000 v l1 2000 @ 100 mhz f1 t r600 - 150 l2 2000 @ 100 mhz j1 rj - 11 1 2 3 4 5 6 e1 p3100sbrp 220 pf, 300 v c42 figure 12 : suggested over - voltage protection and emi suppression circuit table 27 : reference bill of materials for figure 12 reference part description source example mfr p/n e1 bidirectional thyristor, 275v/ 100a diodes, inc. tb3100h - 13 -h f1 150ma, 600v ptc resettable fuse bourns mf - r015/600 or equivalent l1,l2 2 k @ 100 mhz, 200 ma min, 0805 steward/tdk mpz2012s601a c36 , c35 220 pf, 3000 v tdk c4532cog3f221k c42 220 pf, 300 v vishay vj1206y221kxeat5z downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 32 rev. 1.6 4.4 isolation barrier pulse transformer the isolation element used by the 73m1x22 is a standard digital pulse transfor mer. several vendors supply compatible transformers with up to 6000 v ratings. since the transformer is the on ly component crossing the isolation barrier other than emi capacitors that may be required, it solely determines the isolation between the pstn and the 73m1922 digital interface. this method of isola tion is significantly superior to other isolation techniques with major advantages in high common mode voltage operat ion, lower radiated noise (emi) and improved operation in noisy environments. table 28 lists some pulse transfor mers compatible with the 73m1x22. the table also includes low er - voltage transformers that offer low -cost alternatives if such voltages are sufficient. table 28 : compatible pulse transformer sources company number sumida esmit 418 0 wurth electronics midcom inc. 750110001 umec tg - utb01543s datatronics pt79280 aasupreme p95003 table 29 lists some of the typical transformer specification s used by the 731x22. contact the manufacturer directly for product information. table 29 : transformer characteristics parameter test condition min nom max tolerance unit inductance 100 khz, 10 mvac, 1 - 2, ls. 54 60 200 C h interwinding capacitance C C C 6 C pf turn ratio C C 1:1 C 2 % n/a dc resistance primary C C 0.25 C secondary C C 0.25 C dielectric breakdown voltage 1 sec 2000 3750 C C vrms et constant C C 1.2 C C v s surge test 1.2 x 50 s 2800 6000 C C v peak operating temperature C - 40 C 85 C c downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 33 5 control and status registers table 30 shows the register map of addressable registers for the 73m1822 and 73m1922. the shad ed cells in the register map indicate read only and canno t be modified. reserved bits should be left in their default state. accessing unspecified registers should be avoided. each regi ster and bit is described in detail in the following sections. for registers 0x12 through 0x1f, which are located in the lin e- side device, there is a minimum time between consecutive write transactions of 300 s. table 30 : control and status register map address (hex) default bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 01 00h/9ch dsy en nslave2 nslave1 nslave0 msiden msid sck32 reserved 02 00h tmen reserved r eserved reserved reserved enlpw spos hc 03 f0h gpio7 gpio6 gpio5 gpio4 rgmon det synl rgdt 04 f7h dir7 dir6 dir5 dir4 revhsd 3 revhsd 2 revhsd 1 revhsd 0 05 0bh engpio7 engpio6 engpio5 engpio4 enapol endet ensynl enrgdt 06 00h pol7 pol6 pol5 pol4 reserved reserved reserved reserved 07 00h reserve d reserved reserved reserved dts t3 dts t2 dts t1 dts t0 08 dah pseq7 pseq6 pseq5 pseq4 pseq3 pseq2 pseq1 pseq0 09 efh prst2 prst1 prst0 pdvsr4 pdvsr3 pdvsr2 pdvsr1 pdvsr0 0a 31h ichp3 ichp2 ichp1 ichp0 reserved kvcoh2 kvcoh1 kvcoh0 0b 2ah reserved ndvsr6 ndvsr5 ndvsr4 ndvsr3 ndvsr2 ndvsr1 ndvsr0 0c 06h nseq7 nseq6 nseq5 nseq4 nseq3 nseq2 nseq1 nseq0 0d 42h lokdet slhs reserved reserved chngfs nrst2 nrst1 nrst0 0e 00h frcvco pwdnpll reserved reserved reserved reserved rgth1 rgth0 0f 2ch enfeh pwdn sleep reserved xib1 xib0 reserved reserved 10 00h reserved reserved reserved cmvsel cmtxg1 cmtxg0 cmrxg1 cmrxg0 12 00h ofh endc enac enshl enlvd enfel endt ennom 13 00h dciv1 dciv0 il m accen pldm ovdth idispd1 idispd0 14 00h txbst daa1 daa0 reserved rxbst rlpnh rxg1 rxg0 15 00h reserved disntr reserved cidm then enuvd enovd enoid 16 01h txen rxen rlpnen aten fsctr3 fsctr2 fsctr1 fsctr0 17 00h apws reserved reserved acz1 acz0 reserved reserved reserved 18 01h tes t3 tes t2 tes t1 tes t0 reserved reserved reserved reserved 19 00h poll match reserved idl2 indx3 indx2 indx1 indx0 1a 00h rng7 rng6 rng5 rng4 rng3 rng2 rng1 rng0 1b 00h lv7 lv6 lv5 lv4 lv3 lv2 lv1 reserved 1c 00h lc6 lc5 lc4 lc3 lc2 lc1 lc0 reser ved 1d 90h revlsd 3 revlsd 2 revlsd 1 revlsd 0 reserved reserved reserved reserved 1e 00h ilmon uvdet ovdet oidet slls reserved reserved reserved 1f 00h polval7 polval6 polval5 polval4 polval3 polval2 polval1 polval0 downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 34 rev. 1.6 throughout this document, type w is read/write, type wo is write only and type r is read only. registers and bits are defined as 0x16[3 :0], where 0x16 is the register address and the numbers in square brackets specify the address bits. the bit order is [msb C lsb] for a field. for example, [3:0] means bits 3 through 0 of a particular field. table 31 : alphabetica l bit map bit name register page default type category accen 0x13[4] 68 0 w daa control function acz1/0 apws aten chngfs cidm cmrxg1/0 cmtxg1/0 cmvsel daa1/0 dciv1/0 det dir4 dir5 dir6 dir7 disntr dts t0 dts t1 dts t2 dts t3 dsy en enac enapol endc endet endt enfeh enfel engpio7 engpio6 engpio5 engpio4 enlpw enlvd ennom enoid enovd enrgdt enshl ensynl enuvd frcvco fsctr gpio4 gpio5 gpio6 gpio7 hc ichp idl2 0x17[4:3] 0x17[7] 0x16[4] 0x0d[3] 0x15[4] 0x10[1:0] 0x10[3:2] 0x10[4] 0x14[6:5 ] 0x13[7:6] 0x03[2] 0x04[4] 0x04[5] 0x04[6] 0x04[7] 0x15[6] 0x07[0] 0x07[1] 0x07[2] 0x07[3] 0x01[7] 0x12[5] 0x05[3] 0x12[6] 0x05[2] 0x12[1] 0x0f[7] 0x12[2] 0x05[7] 0x05[6] 0x05[5] 0x05[4] 0x02[2] 0x12[3] 0x12[0] 0x15[0] 0x15[1] 0x05[0] 0x12[4] 0x05[1] 0x15[2] 0x0e[7] 0x16[3:0] 0x03[4] 0x03[5] 0x03[6] 0x03[7] 0x02[0] 0x0a[7:4] 0x19[4] 67 67 66 45 72 40 40 40 55 66 73 39 39 39 39 59 76 76 76 76 51 68 59 68 73 73 38 68 39 39 39 39 59 68 65 74 74 72 68 59 73 38 67 39 39 39 39 51 45 38 00 0 0 0 0 00 00 0 00 00 0 1 1 1 1 0 0 0 0 0 0/1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0001 1 1 1 1 0 1100 0 w w w w w w w w wo wo r w w w w wo w w w w w wo w wo w wo w wo w w w w w wo wo wo wo w wo w wo w w w w w w w w w daa control function d aa control function daa control function pll system timing control daa control function call progress monitor call progress monitor call progress monitor signal control function daa control function line sensing control gpio control gpio control gpio control gpio control barrier control function loopback control loopback control loopback control loo pback contro l slave control current limiting detection control and status barrier control function current limiting detection control and status line sensing control line sensing control power control function current limiting detection control and status gpio control gpio control gpio control gpio control barrier control function daa control function daa control function over - curr ent detection control and status over - voltage detection control and status ring detection status function daa control function barrier contro l function under - voltage detection control and status device clock management daa control function gpio control gpio control gpio control gpio control mafe configuration pll system timing control power control function downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 35 bit name register page default type category idispd0 idispd1 ilm ilmon indx kvcoh lc lokdet lv match msid msiden ndvsr n rst nseq nslave ofh oidet ovdet ovdth pdvsr pldm pol7 pol6 pol5 pol4 poll polval prst pseq pwdn pwdnpll revhsd revlsd rgdt rgmon rgth1/0 rlpnen rlpnh rng rxbst rxen rxg0 rxg1 sck32 sleep slhs slls spos synl then tmen tes t txbst txen uvdet xib 0x13[0] 0x13[1] 0x13[5] 0x1e[7] 0x19[3:0] 0x0a [2:0] 0x1c[7:1] 0x0d[7] 0x1b[7:1] 0x19[6] 0x01[2] 0x01[3] 0x0b[6:0] 0x0d[2:0] 0x0c[7:0] 0x01[6:4] 0x12[7] 0x1e[4] 0x1e[5] 0x13[2] 0x09[4:0] 0x13[3] 0x06[7] 0x06[6] 0x06[5] 0x06[4] 0x19[7] 0x1f[7:0] 0x09[7:5] 0x08[7:0] 0x0f[6] 0x0e[6] 0x04[3:0] 0x1d[7:4] 0x03[0] 0x03[3] 0x0e[1:0] 0x16[5] 0x14[2] 0x1a[7:0] 0x14[3] 0x16[6] 0x14[0] 0x14[1] 0x01[1] 0x0f[5] 0x0d[6] 0x1e[3] 0x02[1] 0x03[1] 0x15[3] 0x02[7] 0x18[7:4] 0x14[7] 0x16[7] 0x1e[6] 0x0f[3:2] 65 65 66 66 36 45 73 45 73 36 51 51 45 45 45 51 65 74 74 74 45 65 39 39 39 39 36 36 45 45 38 38 37 37 72 72 72 67 67 73 55 55 55 55 51 38 59 59 51 59 67 76 76 55 55 73 38 0 0 0 0 0 001 0 0 0 0 0/1 0/1 101010 000 0000110 0/1 0 0 0 0 01111 0 0 0 0 0 0 0 111 11011010 0 0 0111 1001 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 11 wo wo wo r w w r r r r w w w w w w wo r r wo w wo w w w w w r w w w r r r r r w w w r wo wo wo wo w w r w w r w w w wo wo r w daa control function daa control function daa control function daa control function line - side device register polling pll system timing control auxiliary a/d converter status pll system timing control auxiliary a/d converter status line - side device register polling slave control slave contro l pll system timing control pll system timing control pll system timing control slave control daa control function over - current detection control and status over - voltage detection control and status over - voltage detection control and status pll system timing control daa contr ol function gpio control gpio control gpio control gpio control line - side device register polling line - side device register polling pll system timing control pll system timing control power control function device clock management device revision device revision ring detection status function ring detection status function ring detection status function daa control function daa control function auxiliary a/d converter status signal control function signal control function s ignal control function signal control function slave control power control function barrier control function barrier control function mafe configuration barrier control function daa control function loopback controls loopback controls signal control function signal control function daa control function device clock management downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 36 rev. 1.6 5.1 line - side device register polling the register map as read from a 73m1x22 host - side device consists of two groups. the first is the host - side device registers (0x00 through 0x11) and the second is a copy of the line - side device registers (0x12 through 0x1f). as an extra degree of integrity the 73m1x22 supports the ability to manually mon itor the registers of its l ine - side device. this is achieved by using the manual poll function. the line - side registers that can be polled are 0x12 through 0x18. the method is to write the offset address of the line - side device register to be read into the indx field. the value of this is the offset from 0x12; that is, register 0x12 is 0x0, 0x13 is 0x1, etc. the next step is to set the poll bit, which causes the device to read the requested register from the line - side device. the value of the requested line - side device register is written into polval (0x1f). this value is compared with that of the host - side copy and if they are the same then the match bit is set. the values presented at match and polval are valid approximately 600 s (depending upon the clock) after a poll request, and are valid only after the poll bit has been reset by the host - side device. function mnemonic register location type description indx 0x19[3:0] w index address of the register to be manually polled w ith the results placed in polval. this address should be cleared after the poll. default = 0. match 0x19[6] r polling match 0 = no match. (default) 1 = this read - only bit indicates that there is match with the corresponding polled register in the host - side device. the result of the polling function can be read only after the poll bit is reset to zero by the 73m1x22. poll 0x19[7] w polling enable 0 = polling disabled. (default) 1 = manually polls the control register in the line - side device whose addr ess is given by indx. the poll bit remains high until the match result is available at which time it will be reset to 0 and the match bit status can be read. polval 0x1f[7:0] r polling value when 73m1x22 is polled, the content of the line - side device reg ister given by the offset address in indx is placed in this register. default = 0. this register can be read after the poll bit has been reset to zero, indicating the result is ready. downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 37 6 hardware control functions this section describes the 73m1x22 capa bilities with respect to its configuration and hardware pin control. this includes features such as interrupt control, power management, clock cont rol, general purpose input/output (gpio) and control of the call progress monitor. 6.1 device revision the 73 m1922 provides the device revision number for the host - side device and the line - side device. for the 73m1822b07 and 73m1922a01 (73m1902b04) host - side device, the current revision is 0111. for the 73m1822b07 and 73m1922a01 (73m1912b07) line - side device, t he current revision is 1001. function mnemonic register location type description revhsdn 0x04[3:0] r revision host - side device these read only status bits indicate the revision of the 73m1x22 host - side device. revlsdn 0x1d[7:4] r revision line - side dev ice these read - only status bits provide the device id for the 73m1x22 line - side device. before the barrier synchronization, the value is 0000. after the barrier synchronization, the value represents the device id of the line - side device (73m1912). 6.2 inte rrupt control the 73m1x22 supports a single interrupt that can be asserted under several configu rable conditions. these include status of gpio s, rgmon, det , synl and rgdt . all interrupt sources that are enabled are ored together to create the int output signal . gpio ports that are configured to be output will not generate interrupts. when the int pin goes active (low), the host should read the interrupt source re gister 0x03, which is then cleared after the read operation. an interrupt during wake - on - ring should be interpreted as the detection of a valid ring signal. address 0x03 reset state e0h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gpio7 gpio6 gpio5 gpio4 rgmon det synl rgdt downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 38 rev. 1.6 6.3 power management the 73m1x22 supports three modes of power control for the device. normal mode the 73m1x22 operates normally. sleep mode the device pll is turned off and the internal clock is driven by xtal. sck=1/8 xtal. control and status registers maintain their conte nt. power down the device is shut down altogether. in this mode the mafe is disabled together with the xtal oscillator. to restart the normal operations, reset or power on reset is required. function mnemonic register location type description slee p 0x0f[5] w sleep mode 0 = disable sleep mode. 1 = enable sleep mode. (default) pwdn 0x0f[6] w power down mode 0 = disable power down mode. (default) 1 = enable power down mode. idl2 0x19[4] w ring detect functions 0 = disable ring detect monitoring a/ d function. (default) 1 = enable ring detect monitoring a/d function. enfeh 0x0f[7] w enable front end host 1 = enable front end of the 73m 1902 host - side device. 0 = disable front end of the 73m 1902 host - side device. (default) 6.4 device clock management function mnemonic register location type description frcvco 0x0e[7] w force vco 0 = the system clock is driven from the xtal oscillator. (default) 1 = the system clock is derived from locked pll. this is set to 0 upon reset, sleep or power down mode en abled. pw dnpll 0x0e[6] r pll powered down 0 = pll is not powered down. (default) 1 = pll is powered down. xib 0x0f[3:2] w crystal oscillator bias current control 00 = crystal oscillator bias current at 120 a 01 = crystal oscillator bias current at 180 a 10 = crystal oscillator bias current at 270 a 11 = crystal oscillator bias current at 450 a (default) if oscin is used as a clock input, xib = 00 setting should be used to save power (=167 a at 27.648 mhz). downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 39 6.5 gpio registers the 73m1922 32 - pin qfn package provides four i/o pins (gpio7, gpio6, gpio5 and gpio4). the 73m1822 (42 - pin qfn package) provides one user gpio pin (gpio6). gpio pins are not available on the 20 - pin package version of the 73m1922. each pin can be configured independently as either an input or an output. at power on and after a reset, the gpio pins are initialized to a high impedance sta te to avoid unwanted current contention and consumption. the input structures are protected from floating inputs, and no output levels are driven by any of the gpio pins. the gpio pins are configured as inputs or outputs by writing to the i/o direct ion register ( dir ). the mapping o f gpio pins is designed to correspond to the bit location in their control and st atus registers. the 73m1922 supports the ability to generate an interrupt on the int pin. the sourc e can be configured to generate on a rising or a trailing edge. only gpio ports that are configured as inputs can be used to generate interrupts. function mnemonic register location type description dir 0x04[7:4] w i/o direction these control bits are used to designate the gpio[7:4] pins as either inputs or outputs. 0 = gpio pin is programmed to be an output. 1 = gpio pin is programmed to be an input. (default) gpion 0x03[7:4] w gpio status these bits reflect the status of the gpio7, gpio6, gpio5 and gpio4 pins. if dir bit is reset, reading this field will return the logical value of the appropriate gpion pin as an input. if dir bit is set the pins will output the logical value as written. engpion 0x05[7:4] w gpio interrupt enable each of the gpio enable bits in this register enables the corresponding gpio bit as an edge - tri ggered interrupt source. if a gpio bit is set to one, an edge (which edge depends on the value in the gip register) of the corresponding gpio pin will cause the int pin to go active low, and the edge detectors will be rearmed when the gpio data register is read. poln 0x06[7:4] w gpio interrupt edge selection define the interrupt source as being either on a rising or a falling edge of the corresponding gpio pin. 0 = a rising edge will trigger an interrupt from the corresponding pin. (default) 1 = a fallin g edge will trigger an interrupt from the corresponding pin. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 40 rev. 1.6 6.6 call progress monitor for the purpose of monitoring activities on the line, a call progress monitor is provi ded in the 73m1x22. this audio output contains both transmit and receive data with configurable levels. function mnemonic register location type description cmvsel 0x10[4] w call progress monitor voltage reference select quiescent dc voltage select at aout. 0 = 1.5 vdc. (default) 1 = vcc/2 vdc. cmtxg 0x10[3:2] w transmit path gain setting 00 0 db (for tbs full swing, aout =1.08 vpk) (default) 01 - 6 db 10 - 12 db 11 mute cmrxg 0x10[1:0] w receive path gain setting 00 0 db (for rbs full swing, aout =1.08 vpk) (default) 01 - 6 db 10 - 12 db 11 mute downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 41 7 clock and sampl e rate management the host - side device has an on - chip crystal oscillator, prescaler and pll/nco to allow a choice of a wide range of sample rates and crystal choices. note the following acronyms are used in th is section: f s sampling frequency nco numerically - controlled oscillator 7.1 clock generation with hic (73m1902) the clock generation for the entire chip consists of crystal oscillator, prescal er nco, nco based pll and a clock divider as shown in figure 13 . pll prescalar nco xtal oscillator oscin oscout m/sb pwdnpll sysclk = 36.864 mhz or xtal freq xib(1:0) 2 frcvco 4608 fs= 36.864 mhz fref figure 13 : clock generation block diagram (assumes 8 khz sample rate) 7.2 crystal oscillator the crystal oscillator is designed to operate with a wide choice of crystals (from 9 mhz to 27 mhz). it is a common source configuration with current source loading to reduce power consum ption. the current source levels are configurable in 4 steps by using the xib bits ( register 0x0f[3:2] ) for optimum power performance. on reset the oscill ator runs at its full current level. the host can then step down the current level by setting the xib bits to an appropriate value that is adequate to achieve stab le oscillation with minimal emi generation. oscin oscout xib(1:0) figure 14 : crystal oscillator with configurable load current table 5: crystal oscillator load current versus xib xib load current 00 120 a 01 180 a 10 270 a 11 450 a downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 42 rev. 1.6 7.3 pll prescaler the prescaler converts the crystal oscillator frequency, fxtal, to a convenient frequency to be used as a reference frequency, fref, for the pll. a set of three numbers must be entered t hrough the serial port C p dvsr (5 bit), prst (3 bit) and pseq (8 bit) as follows: fxtal mux count ctrl overflow counter pdvsr pdvsr +1 sequence register rst sequence counter fref pseq] prst figure 15 : prescaler block diagram p dvsr = integer [fref/fxtal]; prst = denominator of the ratio (fref/fxtal) minus 1 when it is expressed as a r atio of two smallest integers = nnco1/dnco1; pseq = divide sequence the prescaler should be desig ned such that the output frequency, fref, is in the range of 2 ~ 4 mhz. 7.4 pll circuit figure 16 illustrates a block diagram of the on - chip pll circuit. the architecture of the 73m1x22 requires that the pll output frequency, fvco , be related to the sampling rate, fs, by fvco = 2 x 2304 x fs. the nco must function as a divider whose divide ratio equals fref/fvco. just as in the nco prescaler, a set of three numbers must be entered through a serial port to affect this divide C ndv sr (7 bits), nrst (3 bits) and nseq (8 bits) as follows: ndvsr = integer [fref/fxtal]; nrst = denominator of the ratio (fvco/fref), dnco1, minus 1, when it is expressed as a ratio of two smallest integers = nnco1/dnco1; nseq = divide sequence vco kvco nco prescaler pfd charge pump nco kd up dn r1 c1 c2 ichp control 3 3 fref kvco control pll output =36.864 mhz figure 16 : pll block diagram upon the system reset, the system clock is equal to fxtal/9. the system clock wil l remain at fxtal until the host forces the transition no sooner the second frame synch period after the write to register0d. when downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 43 this happens, the system clock will transition to pllclk without any glitche s through a specially designed de - glitch mux. the following tables show the register values for several common clock or crystal frequencies and sa mple rates. by using these tables, computing the values for the registers is not necessary in most cases. table 32 : clock generation register settings for fxtal = 27 mhz bit, reg address fs (k hz) pseq 0x08 prst, pdvsr 0x09 ichp, kvco_h 0x0a ndvsr 0x0b nseq 0x0c nrst 0x0d ichp (a) kvco (2:0) 7.2 0xda 0xef 0x20 0x13 0x10 0x04 8 0 8.0 0xda 0xef 0x31 0x15 0x04 0x02 10 1 9.6 0xda 0xef 0x32 0x19 0x1a 0x04 10 2 12.0 0xda 0xef 0x24 0x20 xx 0x00 8 4 14.4 0xda 0xef 0x46 0x26 0x14 0x 04 12 6 16.0 0xa4 0xe9 0x17 0x19 0x1a 0x04 6 7 table 33 : clock generation register settings for fxtal = 24.576 mhz bit, reg address fs (khz) pseq 0x08 prst, pdvsr 0x09 ichp, kvco_h 0x0a ndvsr 0x0b nseq 0x0c nrst 0x0d ichp (a) k vco (2:0) 7.2 xx 0x0a 0x10 0x0d 0x02 0x01 6 0 8.0 xx 0x0a 0x11 0x0f xx 0x00 6 1 9.6 xx 0x0a 0x22 0x12 xx 0x00 8 2 12.0 xx 0x0a 0x14 0x16 0x02 0x01 6 4 14.4 xx 0x0a 0x26 0x1b xx 0x00 8 6 16.0 xx 0x08 0x17 0x18 xx 0x00 6 7 table 34 : clock generation register settings for fxtal = 9.216 mhz bit, reg address fs (khz) pseq 0x08 prst, pdvsr 0x09 ichp, kvco_h 0x0a ndvsr 0x0b nseq 0x0c nrst 0x0d ichp (a) kvco (2:0) 7.2 xx 0x04 0x20 0x0e 0x14 0x04 8 0 8.0 xx 0x04 0x31 0x10 xx 0x00 10 1 9.6 xx 0x04 0x32 0x13 0x10 0x04 10 2 12.0 xx 0x04 0x24 0x18 xx 0x00 8 4 14.4 xx 0x08 0x66 0x39 0x1a 0x04 16 6 16.0 xx 0x03 0x17 0x18 xx 0x c0 6 7 downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 44 rev. 1.6 table 35 : clock generation register settings for fxtal = 24.000 mhz bit, reg address fs (k hz) pseq 0x08 prst, pdvsr 0x09 ichp, kvco_h 0x0a ndvsr 0x0b nseq 0x0c nrst 0x0d ichp (a) kvco (2:0) 7.2 0x da 0x ef 0x30 0x 5 0x1a 0x04 10 0 8.0 0x02 0x2c 0x31 0x13 0x10 0x04 10 1 9.6 0x da 0x ef 0x42 0x1c 0x1e 0x04 12 2 12 0x08 0x66 0x14 0x0e 0x14 0x04 6 4 14.4 0x54 0x ca 0x46 0x1c 0x3e 0x05 12 6 16.0 0x a4 0x e9 0x17 0x1c 0x1e 0x c4 6 7 table 36 : clock generation register settings for fxtal = 25.35 mhz bit, reg address fs(kh z) pseq 0x08 prst, pdvsr 0x09 ichp, kvco_h 0x0a ndvsr 0x0b nseq 0x0c nrst 0x0d ichp (a) kvco (2:0) 7.2 0x92 0xf4 0x50 0x1a 0x06 0x02 14 0 16 0x40 0xca 0x17 0x1d 0x02 0xc1 6 7 downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 45 7.5 pll system timing control table 48 describes the registers used for pll system timing control. table 37 : pll system timing controls function mnemonic register location type description pseq 0x08[7:0] w sequence of the divisor. if prst=0, this register is ignored. prst 0x09[7:5] w rate at which the sequence register is reset. pdvsr 0x09[4:0] w divisor value. default is 01111. ichp 0x0a[7:4] w the sizes of the charge pump current in the pll. kvcoh 0x0a[2:0] w the magnitude of kvco associated with the vco within pll. the following table shows proper kvcoh values per each desired pll voc frequency. kvcoh2 kvcoh 1 kvcoh0 fvco kvco 0 0 0 33 mhz 38 mhz/v 0 0 1 36 mhz 38 mhz/v 0 1 0 44 mhz 40 mhz/v 0 1 1 48 mhz 40 mhz/v 1 0 0 57 mhz 63 mhz/v 1 0 1 61 mhz 63 mhz/v 1 1 0 69 mhz 69 mhz/v 1 1 1 73 mhz 69 mhz/v ndvsr 0x0b[6:0] w divisor value. if nrst=0, thi s register is ignored. nseq 0x0c[7:0] w divisor sequence. lokdet 0x0d[7] r phase locked loop lock detect 0 = pll is not locked. (default) 1 = pll is locked to pclk. chngfs 0x0d[3] w sample rate change sequence enable 0 = no fs change sequence generated. (default) 1 = fs change sequence is enabled. setting this bit to 1 minimizes the barrier power loss period during the sample rate changes. this bit is recommended to be set to 1 for the applications requiring dynamic sample rate changes such as v.34 a nd v.90 modems, etc. nrst 0x0d[2:0] w represents the rate at which the nco sequence register is reset. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 46 rev. 1.6 8 mafe serial interface the serial data port is a bi - directional port that is supported by most host processors. this is a sim ple four - wire interface consisting of a clock, frame sync, data in and data out. the typical i 2 s (inter - ic sound, nxp semiconductor) bus can be easily converted into a mafe - compatible interface. although the 73m1x22 is a peripheral to the host processor, the device can be either a master or slave to the host. the m / s pin dictates what is in control of the serial port. if the m/ s pin is a logic 1 (default), the device is the master; if a logic 0, then it is a slave. the 73m1x22 chip set can be configured to use one of two framing modes. the active lo w frame synchronization ( fs ) signal is pin configurable by the type pin. when the type pin is unconnected or pulled up to logic 1 (mode 1), an early fs is generated in the bit clock prior to the first data bit transmitted or re ceived. when this pin is pulled down to ground (mode 0), a late fs operates as a chip s elect; the fs signal is active for all bits that are transmitted or received. the type input i s sampled during the device reset and is ignored at all other times. the final state of the type pin as the test! pin is de - asserted determines the frame synchronization mode used. in master mode, fs is an output and generated by the microdaa at the frame sync (or sample) rate, fs. in daisy chain/slave mode, regar dless of the type, the master device will only support early mode. the slave device can be of either an early or late type. for every data fs, 16 bits are transmitted and 16 bits are received. the standard 73m1822 device supports the late frame sync mode only. if a need for a frame s ync early mode is required, contact the teridian marketing department for details. 8.1 data and control frame formats the serial bit stream of a data frame from the sdout pin are defined as follows : bit 15 bit 14 bit 13 bit 12 bit 11 bi t 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 rx15 rx14 rx13 rx12 rx11 rx10 rx9 rx8 rx7 rx6 rx5 rx4 rx3 rx2 rx1 rx0 figure 17 shows data and control frames with early and late frame synch. tx15 tx12 tx11 tx10 tx9 tx13 tx8 tx7 tx6 tx5 tx4 tx3 tx2 tx1 tx14 rx15 rx12 rx11 rx10 rx9 rx13 rx8 rx7 rx6 rx5 rx4 rx3 rx2 rx1 rx0 rx14 data frame with early/late frame sync r/w a4 a3 a2 a1 a5 a0 di7 di6 di5 di4 di3 di2 di1 di0 a6 zero zero zero zero zero zero zero do7 do6 do5 do4 do3 do2 do1 do0 zero control frame with early/late frame sync sclk sclk fs (early) sdin sdout sdin sdout fs (early) fs (late) fs (late) ctl/tx0 figure 17 : serial port timing diagram downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 47 if the hc bit (register 0x02[0]) is reset to 0 (default), ctl (bit 0 of t x data) is used for the host to request a control frame. the 16 - bit serial data bit stream received on the sdin is defined as follows: bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 tx15 tx14 tx13 tx12 tx11 tx10 tx9 tx8 tx7 tx6 tx5 tx4 tx3 tx2 tx1 ctl if the ctl bit in the tx data stream is set high by the host, a control frame will be initiated before the next data frame. a control frame allows the host controller to read or write status and cont rol to the 73m1x22. if the hc bit (register 0x02[0]) is set to 1, a control frame is initiated betw een every pair of data frames. the 16 - bit serial data bit stream received on the sdin is defined as follows: bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 tx15 tx14 tx13 tx12 tx11 tx10 tx9 tx8 tx7 tx6 tx5 tx4 tx3 tx2 tx1 tx0 in both cases, bit 15 is transmitted/received first in time. bits rx[ 15:0] are the receive code word. bits tx[17:0] are the transmit code word. the serial bit stream of a control frame on the sdin pin is defined as: bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/ w a6 a5 a4 a3 a2 a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 the serial bit stream of a control frame on the sdout pin is defined as: bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0 0 0 0 0 0 0 0 d7 d6 d5 d4 d3 d2 d1 d0 if the r/w (bit 15 of the control word) bit is set to a 0, the data byte transmitted o n the sdout pin is all zeros and the data received on the sdin pin is written to the register pointed to by th e received address bits (a6 - a0). if the r/w bit is set to a 1, there is no write to any register and the data by te transmitted on the sdout pin is the data contained in the register pointed to by address bits a6 - a0. only one control frame can occur between any two data frames. 8.2 data and control frame timing figure 18 illustrates data and control frames timing of 8 khz sample rate. sclk fs sdin sdout tx tx tx tx tx 1 rx rx rx rx rx rx tr xx r a a di di di 0 0 0 do do do a0 io tx tx tx tx tx 0 rx rx rx rx rx rx tr xx 8 khz data frame control frame data frame figure 18 : data and control frames timing diagram the position of a control data frame is controlled by the spos bit ( register 0x02[1] ). if spos is zer o, the control frames occur midway between data frames, i.e., the time between data fra mes are equal. if spos is set to 1, the control frame is ? of the way between consecutive data frames, i.e., t he control frame is closer to the first data frame. this is illustrated in figure 19 . the spos bit has no effect in slave or daisy chain mode downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 48 rev. 1.6 spos = 0 spos = 1 control frames data frames figure 19 : control frame position versus spos the sdout and fs pins change values following a rising edge of sclk. the sdin pin is sampled on the fal ling edge of sclk. 8.3 serial clock operation sclk is a continuous clock running at 256 ? fs (fs = sample rate frequency). on the 32 - pin version of 73m1922, the sckm (pin 14), which is weakly pulled high internally, can be connected t o ground to stop the scl k after 32 clock cycles. this is illustrated in figure 20 . the 73m1822 and 73m1922 20 - pin tssop packages only support the continuous sclk configuration. table 38 : behavior of sclk under sckm sckm pin nu mber of sclk cycles before being shut off high continuous low 32 sclk and fs in mode 1 (early fs ) sclk fs (mode1) 32 cycles of sclk sclk and fs in mode 0 (late fs ) fs (mode0) sclk 32 cycles of sclk figure 20 : sclk and fs with sckm = 0 downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 49 8.4 microdaa in master/slave configuration the 73m1x22 can be configured as a slave by resetting the m/ s pin to 0. in this mode, fs of the slave device(s) becomes an input from fsd output of the master or previous slave device. fsd is fs delayed by 16 sclk cycles. this delay can be adjusted between 16 and 32 by setting the sck32 bi t (register 0x01[ 1] bit for the number of total devices less than or equal to 4. for more slaves, the sck32 bi t should be reset. this is illustrated in figure 21 and figure 22 . fsd is always of late type (or framed). host sclk fsd fs oscin sdin sdout 73m1902 sclk fsd fs oscin sdin sdout (slave) (master) type m/ s "1" "1" fs sclk sdin sdout mclk 73m1822/ 73m1902 mode "1" type m/ s "0" "0" mode "x" host sclk fsd fs oscin sdin sdout 73m1902 sclk fsd fs oscin sdin sdout (slave) (slave) type m/ s "0" "0" fs sclk sdin sdout 73m1822/ 73m1902 mode "x" type m/ s "0" "0" mode "x" note: gray signals are optional pins depend on package type. figure 21 : example connections for master and slave operation fs 128 cycles of sclk sclk f sd (master) and f s (slave) data frame control frame 128 cycles of sclk 16 cycles of sclk 16 cycles of sclk if requested by bit0 of sdin (slave) if requested by bit0 of sdin(master) figure 22 : master/slave serial timing diagram 8.5 73m1x22 reset the 73m1x22 can be initi alized to a default state by pulling the rst pin low for 100 ns or longer. the device will be ready within 100 s after the removal of reset pul se. the m/ s pin is used to provide reset in the 73m1822 and 72m1902 20 - pin tssop packaged parts. the reset signal is also bi - directional and edge triggered, so either a low - to - high or high - to - low transition will generate a reset. ensure the final state of m/ s is the master or slave mode that is desired. m/ s is used as follows: slave mode transition the m/ s pi n high to low after the power supply has reached the minimum vdd level. if acti ve reset signal is used on power up, only a high - to - low transition is needed; if a reset is needed after power up, a low - to - high - to - low toggle of m/ s is used. the serial port should be ignored during this time. master mode transition the m/ s pin low to high. the transition from low to high should be after the minimum vdd lev el is reached. if an active reset signal is used on power up only a low - to - high transition is needed; if a reset is needed after power up, a high - to - low - to - high toggle of m/ s is required. the serial port should be ignored during this time. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 50 rev. 1.6 8.6 73m1x22 in daisy chain configuration an internal register controls the daisy chain mode. fs pin of a slave device is an input from the fsd pin of the preceding device. in this arrangement, the hc bit ( register 0x02[0] ) is ignored and the software control is automatically enabled. setting ctl (bit 0 of the sdin data stream) to 1 does the control frame request. the delayed fs , fsd , is fed to the subsequent slave device as fs . fsd is delayed from fs and always 16 sclk periods wide. there are 256 sclk pulses between frame syncs. a maximum of 7 sl aves can be supported. to ai d the host in identifying the master data frame, the least significant bit of th e 16 - bit word (from sdout) from the master can be forced to 1 and the least significant bit of the 16 - bit word from the slave(s) to 0 by controlling the msid bits ( register 0x01[2]) of each device. in the cascade mode, the number of slaves supported must be specified in the nslave bits ( register 0x01[6:4] ). it is important to n ote that slave devices oscin comes from the sclk pin of the master device. if a device is configured as a slave (m/ s =0), the internal pll is automatically programmed for the correct operation regardless of the external pll programming. figure 23 and figure 24 illustrate the daisy chain configuration. host sclk fsd fs oscin sdin sdout sclk fsd fs oscin sdin sdout (slave0) (master) fs sclk sdin sdout mclk sclk fsd fs oscin sdin sdout (slave1) 73m1902 73m1822/ 73m1902 73m1822/ 73m1902 type m/ s "1" "1" mode "1" type m/ s "0" "0" mode "x" type m/ s "0" "0" mode "x" gray pins are optional depending on the package type. figure 23 : daisy chaining a master and two slaves fs 128 cycles of sclk sclk fs d (master) and fs (slave0) data frame control frame 128 cycles of sclk 16 cycles of sclk 16 cycles of sclk if requested by setting the ctl(bit0 of sdin stream (master)) 16 cycles of sclk fsd (slave0) and fs (slave1) 16 cycles of sclk figure 24 : timing diagram with one master and two slaves downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 51 8.7 mafe configuration registers the 73m1x22 allows mafe control frame generation via software control or automatic ally by the hardware. using the software - controlled control frame, host resources can be saved by removing the redundant control frame generated by the hardware control. function mnemonic register location type description spos 0x02[1] w spos 0 = control frames occur half way between data frames. (default) 1 = control frames occur after one quarter of the time between data frames has elapsed. hc 0x02[0] w hardware controlled control frame enable 0 = control frame is under host software control, the lsb of sdin data stream becomes a control frame request bit and control frames happen only on request. the actual value of bit 0 of sdin data stream is forced to 0. (default) 1 = control frame generation is under hardware control, bit 0 of sdin data stream becomes bit 0 of the transmit word and control frames occur automatically after every data frame. 8.8 slave registers the 73m1x22 allows a daisy chain of up to seven slave devices on the same bus. in this configuration, only one device on the bus can be a master and the rest are slaves. function mnemonic register location type description dsy en 0x01[7] w daisy chain configuration enable 0 = disable daisy chain. 1 = en able daisy chain. nslave 0x01[6:4] w number of slaves in daisy chain mode specifies the number of slaves supported. the maximum number is 7. there are two default values. the default in master mode is 000. the default in slave mode is 001. msiden 0x01[3] w master/slave identification enable when enabled in a daisy chain configuration, the msid control bit forces the least significant bit of the sdout data stream. 0 = msid feature disabled. 1 = msid feature enabled. (default) msid 0x01[2] w master/slave identification when msiden = 1, in a daisy chain configuration (dsyen = 1), this bit allows selecting the value of bit 0 of the sdout data stream. 0 = the least significant bit of sdout is forced to 0. 1 = the least significant bit of sdout is forced to 1. (default) if dsyen = 0, msid has no impact on the least significant bit of the sdout data stream. (default) sck32 0x01[1] w daisy chain fsd latency control 0 = fs to fs d delay is 32 sclk periods. (default) 1 = fs to fsd delay is 16 sclk periods. this bit must be set when there are four or more slave devices. when a master is driving a slave, only early type is allowed. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 52 rev. 1.6 9 signal processing 9.1 transmit path signal processi ng 9.1.1 general description in the transmit path, data is first sent by the host dsp through a serial inter face to the 73m1822 / 73m1922 then interpolated by a transmit interpolation filter, serialized and transmi tted across to the line - side device, which is fl oating relative to the host - side device earth ground. the data received on the line - side device is then de - serialized and digitally sigma - delta modulated to a one - bit data stream of 1.536 mbps (for a sample frequency of 8 khz). the signal is further filt ered first by a switched capacitor filter and then a continuous anti - aliasing circuit. the frequency response and bandwidth of the transmit path is depend e nt on the sampling frequency (fs). figure 22 and figure 23 show the normalized frequency response of the transmit path. f or fs = 8 khz, the 0.2 db pass - band ripple frequency is from dc to 3.422 khz. the 3 db bandwidth is 3.65 khz. 9.1.2 total transmit path response 0 1 2 3 4 5 6 7 8 100 90 80 70 60 50 40 30 20 10 0 10 transmit path overall frequency response freq(khz) gain (db) 10 100 ? comp osite x( ) 8 0 x 16 ? com iplo xo u xo u figure 25 : transmit path overall frequency res ponse to fs (8 khz) 0 0.5 1 1.5 2 2.5 3 3.5 4 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 transmit passband response freq(khz) gain (db) 1. 1.0 ? comp osite x( ) 4 0 x 16 ? figure 26 : pass - band response of the transmit path downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 53 9.1.3 73m1x22 transmit spectrum figure 27 shows the transmit spectrum observed on the line from dc to 32 khz for a sam ple frequency (fs) of 8 khz. the transmit signal is band - limited (by default) to fs/2=4 khz and is flat (with 0.2 db ripple) to 3.65 khz and is marked as txdb(x) in the figure. also shown, and marked as signaldb(x), is the baseband signal from 1 khz to 2 khz. the aliases of signaldb(x) are shown as aliasdb(x) and are attenuated significantly with bett er than 80 db attenuation at 8 khz, better than 60 db at 16 khz, better than 100 db at 24 khz, etc. 0 4 8 12 16 20 24 28 32 140 120 100 80 60 40 20 0 20 transmit spectrum freq spectrum (db) 20 140 ? signaldb x( ) aliasdb x( ) t xdb x( ) 32 0 16x figure 27 : transmit spectrum to 32 khz 9.2 receive path signal processing 9.2.1 general description in the receive path, the signal from the telephone line is input to the anti - aliasing filter and passed through a selectable low pass (notch) filter, which can be used to attenuate in - band billing tones. the analog signal is digitized by a sigma - delta analog to digital converter. the resulting high frequency one - bit data stream is decimated and sent to the host - side device via the barrier. another decimation fir filter in the host - side device filters the received data and sends it to the host dsp for processing. the frequency response and bandwidth of the receive path is dependent on the sampling frequency (fs) . figure 28 and figure 29 show the normalized frequency response of the receive path, including the effect o f the decimation filter in the 73m1902/73m1822 hic. for fs=8 khz, the 0.2 db pass - band ripple frequency is from dc to 3.342 khz. the 3 db bandwidth is 3.56 khz . downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 54 rev. 1.6 9.2.2 total receive path response figure 28 : overall frequency response of the receive path figure 29 : pass - band response of the overall receive path downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 55 9.3 signal control functio ns table 39 : signal control functions function mnemonic register location type description txbst 0x14[7] wo transmit boost used in conjunction with daa to manage transmit level. if set to 1, transmit signal is increased by 6 db. see section 9.3.1 . daa 0x14[6:5] wo daa tx gain used in conjunction with txbst to manage transmit level. see section 9.3.1 . rxbst 0x14[3] w received boost if set to 1, receive signal is increased by 20 db. default is 0. rxg 0x14[1:0] wo receive gain sets the receive path gain/attenuation. see table 41 . txen 0x16[7] wo transmit path enable 1 = enable transmit path. 0 = disable transmit path . (default) rxen 0x16[6] wo receive path enable 1 = enable receive path. 0 = disable receive path. (default) 9.3.1 transmit and receive level control on the transmit side, 0 dbm transmit programming at the mafe interface r esults in ~0 dbm on the line. o n the receive side, 0 dbm receive signal on the line results in ~0 dbm at the mafe int erface. on the transmit side there are three bits to adjust the transmit level: txbst (register 0x14[7]), daa(1:0) (register 0x14[6:5]). table 40 : transmit gain control txbst daa1 daa0 gain, nom. units 0 0 0 +2.0 db 0 0 1 0.0 db 0 1 0 - 4.0 db 0 1 1 - 8.0 db 1 0 0 +8.0 db 1 0 1 +6.0 db 1 1 0 +2.0 db 1 1 1 - 2.0 db downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 56 rev. 1.6 on the receive side, there are two rxg bits rxg(1:0) (register 0x14[1:0]) t o control the receive gain. the rxg bits need to be set to 00. when the received line signal exceeds the voltage specified in itu - t recommendation g.712 (2001) , the receive gain must be reduced to prevent saturation and clipping within the receive signal processing path. table 41 : receive gain control rxg1 rxg0 gain nom units 0 0 0.0 db 0 1 +3.0 db 1 0 +6.0 db 1 1 +9.0 db downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 57 10 barrier information 10.1 isolation barrier the 73m1x22 uses the teridian microdaa proprietary isolation method based up on low cost pulse transformer coupling. this technique provides several advantages over other m ethods, including lower bom cost, reduced component count, and significantly enhances common mode nois e immunity, lower radiated noise (emi), and improved operation in noisy environments. the microda a technology has additional and enhanced functionality such as the support of powering the line - side daa circuit from the host - side device. this allows operation on leased lines circuits and on low current cond itions commonly encountered in long loops. the microdaa can also operate entirely from line power wh en sufficient loop current is available. since the transformer is the only component crossing the isolation barrier, it sole ly determines the isolat ion between the pstn and the 73m1x22 digital interface. several vendors can supply compatible transformers with ratings up to 6000 v. 10.2 barrier powered options the 73m1x22 has the ability to be used either in a line powered mode or one where the line - si de device can be powered across the barrier from the host - side device. the power on default for the 73m1x22 is barrier powered mode. 10.2.1 barrier powered operation in this default mode of operation the 73m1x22 host - side device drives the pulse transformer in such a way that power pulses are time division multiplexed into the transmit bit str eam (half the time) that is rectified by circuitry in the line - side device and use s this energy to power itself. 10.2.2 line powered operations if there is sufficient current a vailable from the pstn line, the 73m1x22 can be programmed to use line power instead of across the barrier. 10.3 synchronization of the barrier since the communication across the barrier is digital, synchronization of dat a across the barrier is of absolute importance. to that end, the devices implement special procedures to ensure rel iability across the barrier. when loss of synchronization is detected, the slhs bit is set to 1 and likewise s ynl is also set to 1 and initiates an interrupt to the host. once the synl bit is asserted a new barrier sy nchronization sequence will automatically begin. once read, the slhs bit is reset, but will be set again if the synchronization loss continues. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 58 rev. 1.6 upon power up, the following sequence should be used to ensure barrier synchronization: 1. the line - side device (73m 1902) starts in barrier powered mode and transmits a preamble to aid the pll locking of the line - side device. 2. when pll lock detect is achieved, the line - side device transmits status data to the host - side device. 3. when the line - side status data is detected by the host - side device, the barrier is considered to be in synchronization by the host - side device. 4. if the auto - poll mode is enabled, the device id is transmitted, which is followed by trans mit data. 5. upon detection of the device id, the line - side device considers the barrier to be in synchronization in host - to - line side direction. 6. line - side device starts sending receive data. 7. if the auto - poll bit is enabled, the host - side device will have polled the device id of the line - side device. if the barrier is synchronized, then register 0x1d[7:4], will be 1100. if not synchronized, then 0000. 10.4 auxiliary a/d converter line monitoring and sensing is performed with an 8 - bit auxiliary a/d converter integrated in the 73m1922 /73m1822. the input signals are connected to rgp and rgn pins. in certain appli cations, this a/d can be used to sample signals unrelated to pstn daa functions. in this type of application, it is necessary to isolate the input signal with optical or other means since the 73m1x22 is c onnected directly to the pstn and is susceptible to high voltage surge. under normal conditions, rgp and rgn are ac coupled to the line through high - voltage (250 v) capacitors. 10.5 auto - poll once the msbi acquires synchronization, the msbi state machine automatically s ends a polling command to the 73m1x12 lic. more specifically, the host - side device (73m1902) requests that the line - side device (73m1912) transmits its revision id to the contents of registe r 0x1d[7:4] in the 73m1902. the revision id part of that specific register is cleared upon power up or upon loss of synchroniz ation. after this auto - poll sequence, the host should read register 0x1d[7:4] and determine if the revision id field is all zeros or not. if it is not all zeros, this implies synchronization is established between th e host - side device and line - side device. the auto - poll mechanism can be disabled by setting the enapol bit ( register 0x05[3] ). downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 59 10.6 barrier control functions table 42 : barrier control functions function mnemonic register location type description enlpw 0x02[2] w enable line power 0 = barrier powered mode is selected. (default) 1 = line powered mode is selected. bit enlvd must have the value of 0 before switching from line powered mode to barrier powered mode. otherwise level detection is disabled and the transition to barrier powered mode will not occur. synl 0x03[1] r barrier synchronization loss 0 = indicates synchronization of data across the barrier. 1 = indicates a loss of synchronization of data across the barrier. this status bit is reset when read. this is a maskable interrupt. it is enabled by the ensynl bit. enapol 0x05[3] w enable automatic polling 0 = disables automatic polling. 1 = initiates automatic polling of the 73m1x22 line - side device id upon the establishment of the barrier syn. (default) if syn is lost, the device id will be reset to 0000. e nsynl 0x05[1] w enable synch ronization loss detection interrupt 0 = disables synch loss detection interrupt. 1 = enables synch loss detection interrupt. (default) when the 73m1x22 detects a loss of synchronization in the host - side barrier interface , synl 0x03[1] will be set and reset when read. slhs 0x0d[6] r synchroniz ation loss host side this bit indicates the status of the barrier interface as seen from the host - side. 0 = host - side barrier interface is synchronized. 1 = host - side barrier interface los t synchronization. (default) once read, the slhs bit is reset, but will be set again if the synchronization loss continues. disntr 0x15[6] wo disable no - transition timer if enabled, the no - transition timer is a safety feature. if the barrier fails, i.e. no transition is detected for 400 s, the line - side device resets itself and goes on hook to prevent line holding in a failure condition. 0 = enables no - transition timer of 400 s. (default) 1 = disables no - transition timer. slls 0x1e[2] w synchronization loss line side 0 = txrdy will co ntinuously be generated following synchronization loss so as to allow slls information to be transferred across the barrier. this causes an automatic transfer of 1eh. (default) 1 = synchronization is lost in the line - side device due to header. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 60 rev. 1.6 10.7 line - sid e device operating modes the architecture of the 73m1x22 is unique in that the isolation barrier device, an i nexpensive pulse transformer, is used to provide power and also bidirectional data between the host - side device and the line - side device. when the 73m1x22 is on hook, all the power for the line - side device is provided over the barrier interface. after the line - side device goes off hook, the telco line supplies approximately 8 ma to the line - side device while the host provides the remainder across the barrier. it is also p ossible to power the line - side device entirely from the line provided there is at least 17 ma of loop current avai lable. setting the enlpw bit enables this mode and turns off the power supplied across t he barrier. there is a pena lty in using this mode in that the noise and dynamic range are about 6 db worse th an with the barrier powered mode. it is therefore recommended that the line powered mode be reserved for applic ations where the absolute minimum power from the host side is a priority and the reducti on in performance can be tolerated. figure 30 shows the ac and dc circuits of the line - side device. q5 mmbta06 1 3 2 u2 73m1912 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 ofh vnd/vnx scp mi d vpx sre srb vbg acs vns vps r xp r xm txm dcd dce dcb dci rgn rgp c23 2.2uf r18 240 r9 8.2, 1% r10 5.1k q3 mmbta42 1 3 2 r4 255, 1% r4 100k, 1% q6 bcp56 1 2 3 4 ring - + br1 hd04 4 1 3 2 q4 mmbta92 1 3 2 r2 10m r7 5.1k q7 mmbta42 1 3 2 r12 200 r3 412k, 1% ti p figure 30 : line - side device ac and dc circuits the dcvi bits control the voltage versus current characteristics of the 73m 1x22 by monitoring the voltage at the line divided down by the ratios of (r3+r4)/r4 (5:1) during off - hook and (r2+r4)/r4 (101:1) during on - hook period measured at the dci pin. this voltage does not include the voltage across th e q4 and the bridge. when both the enac and endc bits are set (the hold mode), the dcv i characteristics follow approximately a 50 load line offset by a factor determined by the dcvi bits. if endc=1 and ena c=0, the 73m1x22 is in the seize mode and the dc voltage characteristic will be reduced to m eet the australian seize voltage requirements regardless of the setting of the dcvi bi ts. 10.8 fail - safe operation of the line - side device the 73m1x22 provides additional protection against improper operation during error and harmful external events. these include power or communication failure with the line - side device and the detection of ab normal voltages and currents on the line. the basis of this protection is to ensure t hat under these conditions the device is in the on - hook state and the isolation is provided. the following events will cause the 73m1x22 line - side device to go to the on - hook state if it is off - hook: 1. a power - on reset occurs while off - hook. 2. the non - transition timer function (see disntr ) is triggered by the absence of any signal transitions for more than 400 s on the barrier interface, indicating a problem with communicati ons. 3. the power supply to the line - side device is below normal operating levels. downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 61 11 configurable direct access arrangement (daa) the 73m1x22 line - side device integrates most of the circuitry to implement a pstn line interfac e or daa that is capable of being globally compliant with a single bill of materials. the 73m1x22 supports the following daa functions: ? pulse dialing ? on and off hook switch control ? loop current (dc - iv) regulation ? line impedance matching ? ring detection ? tip and r ing voltage polarity reversal detection ? billing tone rejection ? trans - hybrid cancellation the device is able to support barrier - powered mode in which the pstn loop current may be as low as 8 ma. 11.1 pulse dialing the 73m1x22 supports pulse dialing. see sect ion 11.6 for the description applicable control and status bits and section error! reference source not found. for a description of a recommended procedure. 11.2 dc termination dc termination or loop cur rent (dc - iv) regulation is managed by the 73m1x22 line - side device by configuring the appropriate registers. no additional components are necessary. the 73m1x22 provides a dc transconductance circuit that regulates the tip to rin g voltage depending on th e dc current supplied by the line. there are four settings that can be used to set the voltage to current ratio. figure 31 shows the dc - iv characteristics of the 73m1x22 with special regions of interest. v i 41 * programmable turn-on voltage current limit turn-on=42 ma 2.2 k current limit turned on * ~50 ? with 8 ? fuse resistance seize voltage figure 31 : dc - iv characteristics downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 62 rev. 1.6 the 73m1x22 can: ? shift the characteristics by setting the turn - on voltage. ? enable a current limit of 42 ma. the 73m1x22 meets a wide range of different countries requirements under softw are control. see section 11.7 . there are two operating states for the dc - iv circuits: hold and seize. 0 2 4 6 8 10 12 14 5 9 15 20 30 40 50 60 70 80 90 96 110 tip/ring voltage dc current, ma dcvi performance dciv=00 dciv=01 dciv=10 dciv=11 figure 32 : tip - ring voltage versus current using different dciv se ttings the hold state is the nominal operational point for the dc - iv circuits. the response shown in figure 31 is for the hold state (both dc and ac transconductance circuits are enabled). the slope of the dc - iv characteristics is approximately 50 when the series resistance of a typical ppt c resettable fuse is taken into account. the seize state is a condition that is used by some central offices to determine an off - hook condition. in this state an additional load is added to the nominal operational dc - iv characteristics used during the hold state in the seize state (only the dc transconductance circuit is enabled), the turn - on voltage is reduced on the line independent of the dc - iv control bits. see the description of the dciv bit in section 11.6 . downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 63 an example of the use of the seize state is that of australia in which require s this stat for the first 300 ms immediately after going off hook. 0 2 4 6 8 10 12 14 0 10 20 30 40 50 60 70 80 90 100 tip/ring voltage dc current, ma dcvi performance dciv=xx australian not recommended region australian prohibited region figure 33 : voltage versus current in the seize mode is the same for all dciv set tings to facilitate the quick capture of the loop, the bandwidth of the dc loop is high upon power up. on the completion of dc loop capture, it should be lowered to avoid the interaction of dc and a c loops. see the description of the ennom bit in section 11.6 . 11.2.1 current limit detection if the daa current limiting feature is enabled and the device detects a limit ed condition, then a status bit is set to give an indication of this event. 11.3 ac termination international daa functionality is supported without any external termina tion components through the following functions: ? enable/disable ac termination aten bit at register 0 x16[4]. ? select ac termination impedance using the acz bits at register 0x17[4:3] acz active termination loop setting 00 = 600 ? (usa, japan) 01 = 270 ? + 750 ? || 150nf ( etsi es 203 021 -2) 10 = 200 ? + 680 ? || 100nf (china) 11 = 220 ? + 820 ? || 115nf (australia) the ac impedance presented to the line can be altered as described in the ac terminati on register (register 0x17). this is a part of a feedback loop that monitors the line and feeds an ap propriate ac current back to line, such that the desired impedance looking into the rxp pi n (of the 73m1912 lic) is realized. figure 34 shows magnitude response of the impedance matching filter for the case of etsi es 203 021 - 2. it is ap proximately equal to the inverse of the frequency characteristics of the impedanc e being realized. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 64 rev. 1.6 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 1 2 3 4 5 6 7 8 9 10 freq response of ipmf, az=01 khz 10 0 f1db f 1000 ? ( ) 5 0 f figure 34 : magnitude response of ipmf, acz=01 ( etsi es 203 021 - 2) 11.4 billing tone rejection some countries use a la rge amplitude out - of - band tone to measure call duration to allow remote central offices to determine the duration of a call for billing purposes. to avoid saturati on and distortion of the input caused by these tones, it is important to be able to reject them. typical values of frequency are 12 khz or 16 khz. the 73m1x22 has an integrated notch filter that attenuates either of these tones. by enabling this filter and selecting the position of the notch frequency such tones will be attenuated. figure 35 shows the magnitude response of the filter with a notch at either 12 khz or 16 khz. 0 2 4 6 8 10 12 14 16 18 20 50 40 30 20 10 0 10 spans 20khz 1050 ? f1db f 1000 ? ( ) f2db f 1000 ? ( ) 20 0 f figure 35 : magnitude response of billing tone notch filter in addition to the notch filter, the 73m1x22 can indicate the presence of an overl oad condition when a lines ac voltage exceeds 3.5 vpk. downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 65 11.5 trans - hybrid cancellation a transmit bit stream (tbs) emulating a sinusoid of 1 khz, full scale (code wo rd of +/ - 32,767) is applied to sdin and the residual signal is measured at sdout. unless stated otherwise, test conditions are: acz=00 (600 termination), then=1, aten=0, daa=01, txbst=0. txm is externally fed back into the line - side device (73m1912) to effect cancellation of transmit signal. table 43 : trans -h ybrid cancellation parameter test condition min nom max units transmit hybrid cancellation measure rxd in hic 26 db offset voltage 50% 1s density 25 50 mv ac swing 1khz sinusoid at tip and ring 0.85 0.95 1.05 vpk idle noise 300 hz C 4 khz at tip an d ring - 81 dbm 11.6 direct access arrangement control functions these transmit control registers contain control information to set up the li ne side of the 73m1x22. included are dc - iv characteristics, off - hook control, etc. table 44 : daa control functions function mnemonic register location type description ofh 0x12 [7] wo off - hook enable this bit controls the state of the hook signal. 0 = on - hook. (default) 1 = off - hook. pldm 0x13[3] wo pulse dialing mode enable alleviates the strict timing requirements for the host having to control endc and ofh during pulse dialing. with pldm = 1, the host only has to toggle ofh to perform pulse dialing. 0 = pulse dialing mode is disabled. (default) 1 = pulse dialing mode is enabled. idis pd 0x13[1:0] wo discharge and pulse dialing controls the dc discharge current and how fast the loop turns off. affects pulse dialing waveform. controls the amount of discharge current during hook switch transitions. 0 = minimum current. (default) 1 = ma ximum current. it is recommended to set idispd to 1 prior to hook switching operations. ennom 0x12[0] wo enable nominal operation 0 = speeds up the on and off hook transitions time by increasing the dc loop bandwidth of the dc transconductance circuit in the 73m1x22. this can be used for pulse dialing. in addition, ennom=0 prevents the reset of all bits in register 0x12. (default) 1 = enter nominal operation. reduces the loop bandwidth of the dc transconductance circuit. allows reset of register 0x12 caused by bits uvdt, ovdt or oidt. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 66 rev. 1.6 function mnemonic register location type description dciv 0x13[7:6] wo dc current voltage characteristic control hold state with endc and enac=1, 20 ma dc loop current except if the dc - iv curve is shifted to a value given by these bits. this assumes that there is a 5:1 attenuation of off - hook. dciv1 dciv0 description 0 0 dc loop on voltage of 0.73v (5.60 v at tip/ring assuming a 5:1 step down of off - hook voltage) 0 1 dc loop on voltage of 0.977 v (6.75 v at tip/ring assuming a 5:1 step down of off - hook voltage) 1 0 d c loop on voltage of 1.232 v (7.65 v at tip/ring assuming a 5:1 step down of off - hook voltage) 1 1 dc loop on voltage of 1.488 v (9.35 v at tip/ring assuming a 5:1 step down of off - hook voltage) *seize state with endc=1 and enac=0, 20 ma loop current. x x=dc loop on voltage of 0.281v (3.9 v at tip/ring assuming 5:1 step down of off - hook voltage) current limiting detection control and status ilm 0x13[5] wo current limit enable this control enables or disables loop current limit. 0 = no current limit. (d efault) 1 = 42 ma current limit enabled. ilmon 0x1e[7] r current limit mode on this status bit is effective only when the ilm bit is set to 1. 0 = loop current is lower than 42 ma. 1 = loop current is higher than 42 ma and the current limiting mode is active. thdcen 0x13[4] w enables the cancellation of ac signals within dcgm circuit 0 = disables ac cancellation. 1 = enables the cancellation of ac from dcgm circuit. aten 0x16[4] w active termination loop enable enables or disables active termination l oop. 0 = disable. (default) 1 = enable active termination loop. normal operation requires this bit to be set to always enable a termination circuit. downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 67 function mnemonic register location type description fsctr 0x16[3:0] w filter sample rate selection. since impedance matching is done thru the use of a switched capacitor filter, the realized impedance is exact only if sample rate frequency (fs) matches to the sample rate specified in fsctr(3:0). when the actual sample rate is not any one of the followings in the table, a setting closest to the actual fs should be chosen to minimize mismatching errors. these setting will affect both in ac impedance matching filter (ipmf) and receiver low pass notch filter (rlpn) both. control bits fs assumed (khz) fsctr3 fsctr2 fsctr 1 fsctr 0 ipm f rlpn 0 0 0 0 7.2 7.2 0 0 0 1 8 8 0 0 1 0 9 9.6 0 0 1 1 9.6 9.6 0 1 0 0 10.286 9.6 0 1 0 1 11.2 12 0 1 1 0 12 12 0 1 1 1 12.8 12 1 0 0 0 14.4 14.4 1 0 0 1 16 16 1 0 1 x not allowed 1 1 x x not allowed acz 0x17[4:3] w active termination loop controls the selection of the active termination loops per the table shown below. aten must be set to 1 for selection to be enabled. acz field active termination loop setting 00 600 ? (default) 01 270 ? + 750 ? || 150 nf( etsi es 203 021 - 2) 10 200 ? + 680 ? || 100 nf (china) 11 220 ? + 820 ? || 115 nf (australia) apws 0x17[7] w analog power save enable 0 = saves analog power in lic of 73m1822 or 73m1912. 1 = full analog power in lic of 73m1822 or 73m1912. rlpnen 0x16[5] w receive low pass notch enable 0 = bill ing tone receive low pass notch (rlpn) filter bypassed. (default) 1 = rlpn filter enabled. see rlpnh for notch frequency selection. rlpnh 0x14[2] w receive low pass notch 0 = selects receive low pass notch (rlpn) at 12 khz. (default) 1 = selects rlpn at 16 khz. see rlpnen at register address 0x16[5] to enable filter. then 0x15[3] w enable transhybrid circuit the rejection of the transmit signal from the receive signal path. 0 = transhybrid circuit disabled. (default) 1 = transhybrid circuit enabled. t his bit should always be set for optimal performance. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 68 rev. 1.6 function mnemonic register location type description accen 0x13[4] w ac cancellation enable cancels the ac signals from the dc transconductance circuit. 0 = no ac cancellation. (default) 1 = enables the cancellation of ac from the dc transconductance ci rcuit. this should be set for normal operation. enac 0x12[5] wo enable ac transconductance circuit 0 = shut down ac transconductance circuit. aux a/d input = ring detect buffer (rgn) / line voltage (dci). seize state for going off hook. (default) 1 = e nable ac transconductance circuit. aux a/d input = line current (dcs) / line voltage (dci). endc 0x12[6] wo enable dc transconductance circuit 0 = shut down transconductance circuit. (default) 1 = enable transconductance circuit. enshl 0x12[4] wo enable shunt loading 0 = disable shunt loading. (default) 1 = enable shunt loading of the line. enfel 0x12[2] wo enable front end line - side circuit 0 = power down front end line - side circuits. (default) 1 = enable front end blocks excluding dcgm, acgm, shunt regulator. enlvd 0x12[3] wo lev detection (ovdt, uvdt, oidt monitors) 0 = enable lev detection. (default) 1 = disable lev detection (used in line - powered mode to save power). this bit will be 0 when line powered mode is detected (enlpw is set in registe r 0x02[2]) and set to 1 when an interrupt occurs within the line - side device . this bit must be reset prior to switching back to barrier powered mode. downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 69 11.7 international register settings table for dc and ac terminations table 45 list s the recommended acz and dciv register settings for various countries. other par ameters can also be set in addition to the ac and dc termination. these settings along with the r eference schematic (see figure 10 and figure 11 ) can realize a single design for global usage without country - specific modifications. for more information on worldwide approvals, refer t o the 73m1922 world - wide design guide application note . table 45 : re commended register settings for international compatibility country acz dciv country acz dciv country acz dciv argentina 00 10 hungary 1 01 10 pakistan 00 10 australia 11 11 iceland 2 01 10 peru 00 10 austria 1 01 10 india 00 10 phi lippi nes 00 10 bahrai n 00 10 indo nesia 00 10 poland 1 01 10 belgium 1 01 10 ireland 1 01 10 portugal 1 01 10 bolivia 00 10 israel 00 10 romania 1 01 10 brazil 00 10 italy 1 01 10 russia 00 10 bulgaria 1 01 10 japan 00 00 saudi arabia 00 10 canada 00 10 jordan 00 10 singapore 00 10 chile 00 10 kazakhstan 00 10 slovakia 1 01 10 chi na 00 10 kuwait 00 10 slovenia 1 01 10 columbia 00 10 latvia 1 01 10 south africa 11 10 croatia 01 10 lebanon 00 10 south korea 00 10 cyprus 1 01 10 leichtenstein 2 01 10 spain 1 01 10 czech rep 1 01 10 lithuania 1 01 10 sweden 1 01 10 denmark 1 01 10 luxembourg 1 01 10 switzerland 2 01 10 ecuador 00 10 macao 00 10 syria 00 10 egypt 00 10 malaysia 00 10 taiwan 00 10 el salvador 00 10 malta 1 01 10 es 203 021 -2 01 10 estonia 1 01 10 mexico 00 10 thai land 00 10 finland 1 01 10 morocco 00 10 turkey 00 10 france 1 01 10 netherlands 1 01 10 uae 00 10 germany 1 01 10 new zealand 11 10 uk 1 01 10 greece 1 01 10 nigeria 00 10 ukraine 00 00 guam 00 10 norway 2 01 10 usa 00 10 hong ko ng 00 10 oman 00 10 yemen 00 10 1 th ese countries are members of the european union, where there are no longer any regulatory requirements for ac impedance. the suggested setting complies with etsi es 203 021 -2 . other settings can be used if desired. 2 these countries are members of the european free trade association, and their regulation s generally follow the european union model. the suggested setting complies with etsi es 203 021 -2. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 70 rev. 1.6 12 line sensing and status 12.1 auxiliary a/d converter an 8 - bit auxiliary a/d converter integrated in the 7 3m1x22 provides line monitoring and sensing capabilities. the a/d converter input signals are connected to the rgp and rgn pins of the device. it is possible to use this a/d converter to sample signals unrelated to pstn daa functions. howe ver, in this a pplication, it is necessary to isolate the input signal with optical or other means since the 73m1x22 is c onnected directly to the pstn. under normal conditions, rgp and rgn are ac coupled to the line throug h high voltage (250 v) capacitors. through the use of this auxiliary a/d converter, the following line status sensing featur es are supported by the 73m1x22: ? ring detection. ? pstn line already in use detection. ? off - hook detection that a parallel phone has been picked - up C parallel pick - up detection (pp u). ? on - hook detection of dc loop voltage polarity reversals. ? on - hook detection of type ii caller id. 12.2 ring detection ring detection is provided through circuitry connected to the device pins r gp and rgn. any large voltage transition (ringing or line reversal) will be a source for the wake up signal to t he 73m1x22. upon reception of a wake - up signal, the 73m1x22 passes the detected signal to the host where it is to be qualif ied for frequency and cadence (on and off timing of the ring tone bursts) as a v alid ring signal. 12.3 line in use detection (liu) if the 73m1x22 is preparing to go off - hook and dial, it is required to be aware whether the phone line is already in use by another device. if the 73m1x22 determines that the phone line is presently in use, i t can avoid going off - hook and interrupting the call in progress. the timing of the 73m1x22 off - hook transition can be delayed until the 73m1x22 determines that the phone line is available. liu se nsing is done at pin dcin with the aux a/d. 12.4 parallel pick up (ppu) parallel pick up is a means for the 73m1x22 to determine and notify a host in the case w hen the daa is off - hook and a second or parallel connected device during the course of a connection is also made to g o off - hook. 12.5 polarity reversal detection a third type of line sensing requirement is associated with caller id protocols found in japan and some european countries. in these countries, the caller id signals are sent prior to the s tart of normal ringing. a polarity reversal is used to indicate to the 73m1x22 that transmission of cal ler id information is about to begin. the detection of a polarity reversal takes place while the 73m1x22 is in the on - hook state. 12.6 off - hook detection of caller id type ii it is also possible to receive caller id signals while the telephone is in use, referred to as type ii cid. this requires the 73m 1x12 to constantly monitor the line for signals, such as special in - band or cas tones, while the 73m1x22 is in the off - hook state. this is done through the normal receive path. downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 71 12.7 voltage and current detection the 73m1x22 is capable of detecting the following circumstances: ? under voltage on the line ? over voltage on the line ? over current these 73m1x22 built - in mechanisms provide protection to both the device itself and the external line circuitry. if enabled, over voltage and over current detection will cause the 73m1x22 to go on - hook without the intervention of the host. if configured in line powered mode, the detection of an under - voltage condition causes the 73m1x22 to switch automatically to barrier powered operation (see section 10.2.1 ). this is done without the intervention of the host. for each of the detection functions there are enable control and detection status. for eac h of the functions there is a master detection function enable bit that is to be set in order for the funct ions to work. 12.8 under voltage detection (uvd) under voltage detection is an important feature of 73m1x22. it is intended to det ermine if the phone line is not capable of supplying the current that the 73m1x22 requires from the line for p roper operation. if this function is enabled and if the line is not capable of providing this current, the uv d condition will be asserted and can become a source of interrupt from 73m1x22 to its connected host. 12.9 over voltage detection (ovd) if enabled, over voltage detection is indicated if the device senses that the line v oltage exceeds a defined threshold. the device allows the selection of choice of either 60 vpk or 70 vp k (depending upon the attenuation ratio, typically this is 100:1). if enabled the 73m1x22 will automatically go on - hook if over voltage is detected. 12.10 ac signal over load detection this is the same feature as used for the detection of billing tones (see s ection 11.4 ). in this most generic sense, this detector provides an indicator that the ac signal on the line exceeds a value of 3.5 vpk. 12.11 over current detection (oid) when the line current exceeds the safe operating range of the 73m1x22 or the external transistors, the device indicates this condition. if enabled, the 73m1x22 will automatically g o on - hook if an over current event is detected. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 72 rev. 1.6 12.12 line status functions control functions these registers contain control information to set up and use the 73m1x22 line sensing functions. table 46 : line sensing control functions function mnemonic register location type description rxbst 0x14[3] wo received boost if set to 1, receive signal is increased by 20 db. default is 0. this is used to amplify signals that are passed through the auxiliary a/d when on - hook. cidm 0x15[4] w caller id mode 0 = disable caller id mode. (default) 1 = enables caller id mode by coupling the signal from the rgn/rgp pins to the re ceive filter input. a 20 db gain boost is included in the signal path. the rxbst bit should also be set to allow the total nominal gain of 40 db in the caller id path. the normal signal path is disconnected. ring detection status bits rgth 0x0e[1:0] w ring detect threshold controls the ring detect threshold assuming a 100:1 reduction of ring voltage into rgp/rgn pins. rgth1 rgth0 description 0 0 ring detect disabled. for ring detection to occur, these bits must be programmed to a non - zero state. 0 1 0.15 vpk equivalent to 15 vpk at auxil i ary a/d input. 1 0 0.30 vpk equivalent to 30 vpk at auxil i ary a/d input. 1 1 0.45 vpk equivalent to 45 vpk at auxil i ary a/d input. rgmon 0x03[3] r ringing monitor bit 3 monitors the activity of ringing for further cadence check by the host: 0 = silent (default) 1 = ringing this bit is not latched. this status bit is reset when read. rgdt 0x03[0] r ring or line reversal detection voltage greater than the ring detect threshold was detected at rgp/rgn. this v alue is latched upon the event and cleared on read. the threshold is determined by rgth. this is a maskable interrupt. it is enabled by the enrgdt bit. 0 = no latched ring or line reversal detection event. (default) 1 = a latched ring or line reversal detection event. enrgdt 0x05[0] w enable ring detection interrupt this control bit enables the ring detection interrupt. 0 = ring detection interrupt disabled . 1 = rin g detection interrupt enabled. (d efault) when 73m1922 detects an incoming ring signa l, this bit will be set, if enabled, and reset when read. downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 73 auxiliary a/d converter status bits rng 0x1a[7:0] r result of auxiliary a/d measuring the attenuated ring voltage. note: 1 lsb=1.31/128=~10.23 mv; 1s compliment. example: 00100000 ? 327 mv or ring voltage=32.7 v lv 0x1b[7:1] r line voltage o n and o ff h ook lv contains the seven most significant bits of an 8 - bit a/d representation of the voltage of the input of pin dci. the voltage at the dci pin is equal to the decimal value of lv bits [7:1] x 21.87 mv. for example, if the value of 0100000 is read from lv bits [7:1], this has a decimal value of 32, therefore dci voltage equals 32 x 21.87 = 700 mv. note that the voltage at the dci pin is the voltage divided by 5 (off hook) or 100 (on hook). when offhook the diode bridge, switch saturation voltage, etc. should also be added to calculate the voltage at tip and ring. lc 0x1c[7:1] r loop current in dc p ath result of auxiliary a/d measuring the l oop c urrent (7 - bit resolution, least significant bits only). note lc0=1 lsb=1.31/128=~10.23 mv=1.25 ma; magnitude only. the value of the resistor between the rectifier bridge and the dcs pin is assumed to be 8.2 ? . example: 0000011 ? 30.7 mv/re=3.74 ma; 0010000 ? 20 ma note: the ac path also has ~7 ma of loop current that should be added to get the total loop current provided by the line. line sensing control det 0x03[2] r detection of v oltage or c urr e nt f ault 0 = none of the three conditions is detected. (default) 1 = indicates the detection of one of three conditions: under voltage, over voltage and over current. this status bit is reset when read. this is a maskable interrupt. it is enabled by the endet bit. endet 0x05[2] w enables line sensing interrupt on h ost s ide d evice this bit controls w hether an interrupt is generated based upon the detection of under voltage, over voltage and over current. 0 = disable detector interrupt . (default) 1 = enable detector interrupt. endt 0x12[1] wo enable detectors on l ine s ide d evice 0 = uvdt, ovdt and o idt conditions are ignored. (default) 1 = enables uvdt, ovdt and oidt in the line - side device and allows them to be used in the host - side device. under - voltage detection control and status enuvd 0x15[2] wo enable under voltage detector on line side devi ce 1 = under voltage detector enabled. when enabled, the ennom bit is temporarily set to the wide bandwidth mode if an under - voltage condition detected to allow fast reacquisition of the line. uvdet 0x1e[6] r under - voltage detection on line side device 0 = under voltage condition is not detected at vps. (default) 1 = under voltage condition is detected at vps. downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 74 rev. 1.6 over - voltage detection control and status enovd 0x15[1] wo enable over - voltage detector on line side device 1 = over voltage detector enabled (not latched). over voltage detector is enabled if enovd, enfel and ennom all equal 1. ovdet 0x1e[5] r over - voltage detected on line side device 0 = over voltage condition is not detected at rgp/rgn inputs. (default) 1 = over voltage condition is detec ted at rgp/rgn inputs. ovdth 0x13[2] wo over - voltage threshold s etting 0 = over voltage threshold is 0.6 vpk at the chip or 60 vp on the line. (default) 1 = over voltage threshold is 0.7 vpk at the chip or 70 vp on the line. over - current detection control and status enoid 0x15[0] wo enable over - current detector on line side device 0 = over - current detector is not enabled. (default) 1 = over - current detector is enabled. oidet 0x1e[4] r over - current (i) detector on line side device 0 = over - current (i) condition is not detected. (default) 1 = over - current (i) condition is detected at the dcs pin when loop current is > 125 ma if ilm=0, or > 55 ma if ilm=1. downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 75 13 loopback and testing modes figure 36 show the five loopback modes avai lable in the 73m1x22. tbs dsdm prm scm msbi lsbi rxafe sinc3 filter onchip lic mafe interface txafe interp. filter decim. filter txdata rxdata rbs tip ring prp scp txd rxd ctl sta external lic 73m1822 hic/ 73m1902 73m1822 lic/ 73m1912 aux a/d sta alb intlb1 diglb2 diglb1 intlb2 rxa txa txd rxd ring buffer figure 36 : loopback modes highlighted table 47 describes how the above control bits interact to provide each of the six loopback mod es. table 47 : loopback modes test tmen dtst loopback mode mnemonic 0000 0 00 normal mode. (default) no loops 0000 1 10 digital loopback mode. interpolated txdata (txd) is looped back to the decimated rxdata input (rxd). diglb1 0000 1 11 remote analog loopback. received rxd is looped back as txd and transmitted back to the 73m1922 line - side device; rxd is d/a converted to yield the analog transmit signal (txa). intlb1 0001 0 00 digital loopback mode. transmit bit stream (tbs) is looped back to r eceive digital channel and received (diglb2). diglb2 0010 0 00 remote analog loopback. receive analog signal is converted to received bit stream (rbs) and is looped back to tbs and the analog transmit channel (intlb2). intlb2 0011 0 00 analog loopback. the transmit data is connected to the receiver at the analog interface and received (alb). alb downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 76 rev. 1.6 13.1 loopback controls table 48 describes the registers used for loopback control. table 48 : loopback controls function mnemonic register location type description tmen 0x02[7] w test mode enable used to enable the activation of the test loops controlled by the dtst bits (diglb1 and intlb1). 0 = no dtst loops enable. (default) 1 = dtst loops enable. tmen has to be set to 1 before the setting of the dtst bits. dtst 0x07[3:0] w these control bits enable diglb1 and intlb1. prior to writing to these bits, tmen must be set to 1. dtst1 dtst0 selected test mode 0 0 normal (default) 1 0 diglb1 1 1 intlb1 te st 0x18[7:4] w this four - bit field is used to enable the loopback mode per the following table: test loopback mode 0000 normal mode. (default) transmit and receive channels are independent. 0001 digital loo p back mode. transmit bit stream (tbs) is looped back to receive digital channel and received (diglb2). 0010 remote analog loopback. receive analog signal is converted to received bit stream (rbs) and is looped back to tbs and the analog transmit channel (intlb2). 0011 analog loopback. the transmit data is connected to the receiver at the analog interface and received (alb). downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 77 14 performance this section provides an overview of typical performance characteristics m easured using a 73m1x22 production device on a teridian reference board. the measurements were made at the tip and rin g pins. 14.1 dc vi characteristics 14.1.1 off - hook tip and ring dc characteristics figure 37 : off - hook tip and ring dc characteristics tbr21 not allowed 0 10 20 30 40 50 0 2 4 6 8 9 10 15 20 25 30 35 40 45 50 55 60 tip and ring dc current (ma) tip and ting dc voltage (volt) dciv=00, ilm=1 dciv=01, ilm=1 dciv=10, ilm=1 not allowed figure 38 : es 203 021 - 2 dc mask with current limit enabled downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 78 rev. 1.6 0 2 4 6 8 10 12 14 04 8 1525 35 45 55 65 75 85 95 loop current tip and ring dc voltage australian not recommended region australian prohibited region dciv=11 figure 39 : australian hold state characteristics 14.2 receive 0 5 10 15 20 25 30 35 40 45 50 100200 300 400 500 600 700 800 900 10001500 2000 2500 3000 3500 4000 4500 5000 5500 frequency return loss db us tbr21 china australia australia limit usa limit tbr21 limit figure 40 : return loss downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 79 15 package layout figure 41 : 20 - pin tssop package dimensions 2.5 5 2.5 5 top view 1 2 3 0.2 min. 0.35 / 0.45 1.5 / 1.875 3.0 / 3.75 0.18 / 0.3 bottom view 1 2 3 0.25 0.5 0.5 0.25 3.0 / 3.75 1.5 / 1.875 0.35 / 0.45 chamfered 0.30 figure 42 : 32 - pin qfn package dimensions 0.85 nom. / 0.9max. 0.00 / 0.005 0.20 ref. seating plane side view downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 80 rev. 1.6 figure 43 : 42 - pin qfn package dimensions downloaded from: http:/// ds_1x22_017 73m1822/73m1922 data sheet rev. 1.6 81 16 ordering information table 49 lists the order numbers and packaging marks used to identify 73m1822 and 73m192 2 products. table 49 : order numbers and packaging marks part description or der number packaging mark host/line 73m1922 32 - pin qfn, lead free 73m1922 - im/f 73m1912 -m 73m1902 -m line - side ic host - side ic 73m1922 32 - pin qfn, lead free, tape and reel 73m1922 - imr/f 73m1912 -m 73m1902 -m line - side ic host - side ic 73m1922 20 - pin tssop, l ead free 73m1922 - ivt/f 73m 1912vt 73m 1902a line - side ic host - side ic 73m1922 20 - pin tssop, lead free tape and reel 73m1922 - ivtr/f 73m 1912vt 73m 1902a line - side ic host - side ic 73m1822 42 - pin qfn, lead free 73m1822 - im/f 73m 1822a - im 73m1822 42 - pin qfn, lea d free, tape and reel 73m1822 - imr/f 73m 1822a - im 17 contact information for more information about teridian semiconductor products or to check the availab ility of the 73m1822 or 73m1922, contact us at: 6440 oak canyon road suite 100 irvine, ca 92618 - 5201 telephone: (714) 508 - 8800 fax: (714) 508 - 8878 email: modem.support@teridian.com for a complete list of worldwide sales offices, go to http://www.teridian.com . downloaded from: http:/// 73m1822/73m1922 data sheet ds_1x22_017 82 rev. 1.6 revision history revision date description 1.0 10 /26/ 2007 first publication. 1.1 11/7/2007 1.1.1 4/11/2008 1.2 8 /28 / 2008 1.3 3/23 /2009 1.4 8/6 /2009 1.5 10/1 6 /2009 1.6 4/7 /2010 changed the values in table 17 . replaced the schematics in figure 10 and figure 11 . updated the bill of materials in table 27 . added the accen bit to table 30 and table 31 . corrected the types (r, w, wo) in table 31. added clarification to the description of the pldm bit . added clarification to the description of the rgdt bit . teridian semiconductor corporation is a registered trademark of teridian semiconductor corporation. simplifying system integration is a trademark of teridian semiconductor corp oration. microdaa is a registered trademark of teridian semiconductor corporation. all other trademarks are the property of their respective ow ners. teridian semiconductor corporation makes no warranty for the use of its products , other than expressly contained in the companys warranty detailed in the teridian semiconductor cor poration standard terms and conditions. the company assumes no resp onsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at an y time without notice and does not make any commitment to update the information contained herein. accor dingly, the reader is cautioned to verify that this document is current by comparing it to the lates t version on http://www.teridian.com or by checking with your sales representative. teridian semiconductor corp., 6440 oak canyon, suite 100, irvine, ca 92618 tel (714) 508 - 8800, fax (714) 508 - 8877, http://www.teridian.com downloaded from: http:/// |
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