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tv sound mpx for two carrier system s1a0688c01 1 introduction the s1a0688c01 is a monolithic integrated circuit designed for demodulating two carrier tv-mpx broadcast. features ? 1st & 2nd sound if ? double-pll fm detection ? agc for cca part ? matrix for multi-sound broadcasts ? pilot detector ? external control interface ? id indicators (stereo, bilingual) ? available for korea standard ? non-clipping output up to 400% modulation with agc ? available in dc control, normal microcontroler control or iic bus control systems ? id output: direct led drive or iic serial data output ? non-adjust ordering information device package operating temperature S1A0688C01-A0B0 32 - sdip - 400 - 10 to + 70 c 32 - sdip - 400
s1a0688c01 tv sound mpx for two carrier system 2 block diagram 1 19 7 6 8 9 10 12 11 13 14 2 3 4 5 30 23 24 28 22 21 20 32 16 25 27 29 26 15 18 17 31 if if 4.72mhz 1st pll 4.5mhz 1st pll 4.3mhz vco a a 30khz hpf cca cca agc amp matrix 1/39 1/2 1/100 1/370 1/200 x20 100khz lpf 55.1khz sc bpf am det offset canceller dn cut comp mn det digital frequency detector control type auto detect u-com interface (dc/3-line u-com/iic-bus) zapping block x3 276hz sc bpf 150hz sc bpf 390hz sc bpf x8 voltage reference 4.72mhz 2nd pll 4.5mhz 2nd pll s1 s1 vcc vdd gnd vss cca pll
tv sound mpx for two carrier system s1a0688c01 3 pin configuration pin description pin no. description pin no. description 1 analog gnd 17 id filter offset canceling cap. 2 sif 2 input 18 r output 3 sif 2 bypass 19 digital vss 4 sif 1 bypass 20 data input / output (sda) 5 sif 1 input 21 clock input (scl) 6 sif 2 lpf capacitor 22 enable input (en) 7 sif 1 lpf capacitor 23 id indicator (stereo) 8 sif 1 amplifier capacitor 24 id indicator (bilingual) 9 sif 2 amplifier capacitor 25 digital vdd 10 sif 1 det output 26 am det output 11 sif 1 cca input 27 frequency det input 12 sif 2 det output 28 slave custom code 13 sif 2 cca input 29 external clock in 14 agc detect capacitor 30 reference clock monitor 15 l output 31 test mode switch 16 analog vcc 32 voltage reference capacitor s1a0688c01 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 gnd 26 25 28 27 30 29 32 31 if2 bp2 bp1 if1 lpc2 lpc1 ac1 ac2 s1o s1i s2o agc s2i lo vcc rc tms rcm eci scc fdi ado vdd bib stb en scl vss sda ro ofc
s1a0688c01 tv sound mpx for two carrier system 4 absolute maximum ratings recommended operating conditions parameter symbol condition min. typ. max. unit maximum supply voltage vcc max ta = 25 c v i = 0 - - 6 v power dissipation p d - - 1000 mw operating temperature t opr - 10 - 70 c storage temperature t stg - 40 - 125 c parameter symbol condition min. typ. max. unit operating voltage v opr - 4.7 5 5.5 v
tv sound mpx for two carrier system s1a0688c01 5 electrical characteristics dc electrical characteristics (ta = 25 c, vcc = vdd = 5v, fm = 1khz, v i = 80db m , d f = 25khz, unless otherwise specified) * : pilot signal fm deviation is 2.5khz after 50% am modulation. parameter symbol condition min. typ. max. unit icc vi = 0 35 60 85 ma idd vi = 0 - - 2.0 ma sif input limiting voltage vlim - - - 50 db m am rejection ratio amrr am 30% mod 40 55 - db input impedance zin - - 1 - kohm pilot * pilot input sensitivity vps - - - 50 db m id on time ton mono ? st, bi - 1.0 1.5 sec id off time toff st, bi ? mono - - 0.3 sec output level vo - 320 420 520 mvrms matrix matrix thd thdm1 - - 0.2 1.0 % thdm2 d f = 100khz - 0.5 5.0 % noise output (rf off) voff carrier off - - 400 mvrms output impedance zout - - - 50 ohm separation ratio septyp non-adjust 25 - - db sepadj iic bus adjust 40 45 - db cross talk ct d f = 25khz 50 55 - db matrix s/n ratio s/n d f = 25khz 55 60 - db s/n(st) d f = 25khz (st) 50 55 - db mute attenuation ratio amute d f = 25khz - - 66 - 55 db
s1a0688c01 tv sound mpx for two carrier system 6 pin description pin no. symbol pin name description internal equivalence circuit 1 gnd analog ground - - 2, 5 sif2, sif1 sif input pin sif signal input through a sif filter 3, 4 bp2, bp1 if bypass pin if bypass pin is grounded with a capacitor 6, 7 lpc2, lpc1 pll lpf pin the external capacitor extracts dc level from the 1st pll output of fm det. 8, 9 ac1, ac2 det amp nf pin negative feedback pin of fm det amplifier grounded with a capacitor if1 (if2) bp1 (bp2) lpc1 (lpc2) ac1 (ac2)
tv sound mpx for two carrier system s1a0688c01 7 10, 12 s1o, s2o fm det output fm det output pin connected with a de- emphasis circuit 11, 13 s1i, s2i fm detected signal input pin input pin of current control amplifier (cca). fm detected output signal is added to this pin. 14 agc agc det pin agc detect pin is grounded through a capacitor. if the signal level is over the predetermined value, this terminal voltage will be raised. agc function can be deactivated by connect this terminal to gnd. pin description (continued) pin no. symbol pin name description internal equivalence circuit s1o (s2o) s1i (s2i) bias agc
s1a0688c01 tv sound mpx for two carrier system 8 15, 18 lo, ro matrix output pin audio output signal is provided from this pin. 16 vcc analog power - - 17 ofc id bpf offset cancel pin the external capacitor is used to eliminate offset of id filter 19 vss digital ground ? ? 20 sda serial data input and output it is the data communication line of iic bus used to exchange the micom data and ic internal data. 21 scl clock signal clock line of iic bus. pin description (continued) pin no. symbol pin name description internal equivalence circuit lo (ro) ofc sda scl
tv sound mpx for two carrier system s1a0688c01 9 22 en enable select pin it is always ? h ? in dc control system, always ? l ? in iic bus system, and used as strobe port in normal micom system. 23 stb stereo indicator pin when id is detected as stereo, this pin will remain ? l ? (open drain). 24 bib bilingual indicator pin when id is detected as bilingual, this pin will remain ? l ? (open drain). 25 vdd power supply (digital) - - 26 ado am det output pin am detected signal will output from this terminal. 27 fdi frequency det input pin am detected signal goes into this terminal coupled with a capacitor to remove dc offset. pin description (continued) pin no. symbol pin name description internal equivalence circuit en stb bib ado fdi
s1a0688c01 tv sound mpx for two carrier system 10 28 scc slave custom code when open: slave address = 84h (write), 85 (read) when connect to vss: slave address = 86h (write), 87 (read) 29 eci external clock input pin normal is open. it can be used as high speed test for ic maker. 30 rcm reference clock monitor internal reference clock monitor ic maker test option 31 tms test mode switch normal state: open test state: vss ic maker test option 32 rc voltage reference capacitor pin connect to capacitor to stabilize the reference voltage pin description (continued) pin no. symbol pin name description internal equivalence circuit scc eci rcm tms rc
tv sound mpx for two carrier system s1a0688c01 11 operation description system s1a0688c01 consists of if amp, fm det, agc, matrix, u-com control interface and id det blocks. all blocks are operable and available without adjust for korea standard broadcast system. if amp block this block amplifies the provided if signal to a detectable level of fm det. total gain is over 60db and bandwidth is about 3 - 10mhz. fm det s1a0688c01 adopts non-adjust double-pll type fm detection circuits. first pll has a role of chasing fm carrier frequency with wide holding range (for example, hold range is 2mhz) and second pll does actual fm detection with narrow holding range (about 300khz), the free running frequency of 2nd pll is same as the lock frequency of 1 st. pll, and free running frequency of 1 st. pll is determined by internal resistor and capacitor. the free run- ning frequency can be varied by the variation of resistor and capacitor. agc the agc block comprises agc detector part and cca part (current control amplifier). the matrix output signal level is set to 400mvrms when applied 100% modulated fm signal and supply voltage is 5v. as the gain of cca is about 6 db and the gain of matrix is 6db, so the output signal level of cca is 200 mvrms and the matrix output is 400 mvrms. if over- modulated (over 200%) fm signal is added to s1a0688c01 input port, the output will be clipped by supply voltage dynamic limitation range (the linear amplify range is limited lower than 800 mvrms). to prevent this problem, in s1a0688c01 we use agc circuit to reduce the gain of cca part when the over- modu- lated fm signal has been applied, agc circuit is deactivated until the modulation is over 200%. if agc is activated, the thd and separation characteristics of output signal would be deteriorated because the gain of cca is varied according to modulation ratio.
s1a0688c01 tv sound mpx for two carrier system 12 matrix matrix part separates provided fm detected signal into mono, stereo, bilingual, and sub according to broadcast status and end users setting, it mainly consists of analog switches and operational amplifiers. the input and output signal format of matrix is shown as follows. broadcast mode input s1 s2 remark stereo l+r l - r - bilingual main sub - mono main none * * can be main user select output stereo bilingual sub mono broadcast mode lout rout lout rout lout rout lout rout stereo 2l 2r l+r l+r l+r l+r l+r l+r bilingual main main main sub sub sub main main mono main main main main main main main main
tv sound mpx for two carrier system s1a0688c01 13 id det id signal is fm modulated to second carrier (sif2) with a 2.5khz fm modulation after am modulated to 55khz pilot sub-carrier with a 50% am modulation. id det part consists of 3 blocks: that is filter block for extracting pilot carrier, am detector block for am detection of id signal and digital block for detecting the frequency of provided id signal logically. in the filter block, audio signal is removed by hpf and pilot signal is extracted by the automatically adjusted switch - capacitor bpf (band pass filter) with a center frequency of 55khz. id signal is extracted from the pilot carrier in the am detector block, then digital block detects the frequency of id signal, the id signal can be detected in the range shown as follow: this block ? s circuit is configured to reduce the blinking of the id, and consequently has the following characteris- tics: typ 1 sec and max 1.5 sec delay when converting from mono to stereo, or to bilingual. 0.3 sec delay when converting from stereo or bilingual to mono. therefore, when changing the channels on your tv set, a minimum of 1.5 sec is needed for id detect time. figure 1. timing diagram for changing channels from mono to stereo or bilingual the id detect block of the s1a0688c01 can momentarily malfunction if the signal is weak. hence, we recommend that you delay for at least 1 sec at set micom before detecting the id, if the id changes at a fixed channel. figure 2. timing diagram when channel is fixed id low off low on high on high off stereo (150 hz) 125 hz 140 hz 160 hz 176 hz bilingual (276 hz) 237 hz 255 hz 300 hz 312 hz t1 t2 mono mono mono stereo or bilingual stereo or bilingual stereo or bilingual broadcast s1a0688c01 set micom t1: s1a0688c01 ? s id detect time typ 1 sec, max 1.5 sec t2: when changing channels, set micom ? s id detect delay time to a minimum of 1.5 sec. t1 t3 mono mono mono stereo or bilingual stereo or bilingual stereo or bilingual broadcast s1a0688c01 set micom t1: s1a0688c01 ? s id detect time typ 1 sec, max 1.5 sec t3: when the channel is fixed, set micom ? s id detect delay time to a minimum of 1 sec. t3 malfunction skip
s1a0688c01 tv sound mpx for two carrier system 14 micom s1a0688c01 is available in dc control, normal microcontroller control, and iic bus microcontroller control system, and it can distinguish the control type automatically by monitoring pin 22 (en) status. the relation of control source type and pin 22 status is shown as follows. protocol of iic bus microcontroller control (pin 22: l) the s1a0688c01 can be controlled via the 2-line iic bus by the microcontroller. the two lines (sda-serial data. scl-serial clock) exchange information between the devices connected to the iic bus. sda is bidirectional line which is connected to a positive supply voltage via a pull up resistor. when the bus is free both lined are high. the data on the sda line must be stable during the high-powered of the clock. the high or low data can only change when the clock signal line is low. a high -to -low transition of the sda line while scl is high is defined as a start condition. a low- to -high transition of the sda line while scl is high is defined as a stop condition. the bus receiver will be reset by the reception of a start condition and is considered to be busy after the start condition. after a stop condition the bus is considered as free again. data transmitted to the s1a0688c01 starts with the module address as follows: iic bus normal micom dc control en (pin 22) always ? l ? micom strobe always ? h ? 1st byte 1 - 7th bit chip select code (1000010b) 8th bit r/w 9th, 18th, 27th bit acknowledge 2nd byte 10th - 17th bit sub address (function) 3rd byte 197th - 26th bit data (d1 - d8) sda scl 3 2 1 25 26 27 1 0 0 0 0 1 0 r/w ack msb lsb msb first.
tv sound mpx for two carrier system s1a0688c01 15 protocol of normal microcontroller control (pin 22: strobe) the module address of s1a0688c01 in normal microcontroller control mode is as follows: . the maximum strobe pulse width in normal microcontroller control mode should be under 6.0 msec. if the strobe pulse width excess the limit, s1a0688c01 will be changed to dc control mode. control item in each control mode in each control mode, control items is limited as follows: notes: 1. pre-set: when power is on, micom initials the status of s1a0688c01 to preset status. (all ic has same preset status data) 2. pre-adjust set: when power is on, micom initials the status of s1a0688c01 to pre-measured and stored status. (different each ic) 3. data transmission: transmit stored data to micom when micom requests. 4. receive acknowledge: return acknowledge signal to micom after data receipt. 1st byte 1 - 7th bit chip select code (1000010b) 8th bit not use (don ? t care) 2nd type 9th - 16th bit function assignment 3rd type 17th - 24th bit data (d1 - d8) control mode change mute preset pre-adjust set data transmission receive acknowledge iic bus o o o o o o normal micom o o o dc control sda scl 3 2 1 22 23 24 strobe (en) 1 0 0 0 0 1 0 d msb lsb msb first.
s1a0688c01 tv sound mpx for two carrier system 16 micom control map in iic bus mode, slave address = write: 84h, read: 85h in normal micom mode, chip select code = 1000010b notes: 1. msb first 2. when power is on, all latch data are ? 0 ? , s1a0688b is set to mono off, mute off, separation adjust default (00001xxx). 3. separation adjust data sub address (2nd byte) (msb<->lsb) data (3rd byte) msb lsb function remark d1 d2 d3 d4 d5 d6 d7 d8 000xxxxx (mode control) 0 0 x x x x x x mono end user control 1 0 x x x x x x stereo 0 1 x x x x x x bilingual 1 1 x x x x x x sub 001xxxxx (mute control) 0 x x x x x x x mute off 1 x x x x x x x mute 010xxxxx (test mode control) 0 x x x x x x x normal mode ic maker test 1 x x x x x x x test mode 011xxxxx (free run frequency control) 0 0 x x x x x x default 1 0 x x x x x x frequency down 0 1 x x x x x x default zap 1 1 x x x x x x frequency down zap 100xxxxx d1 d2 d3 d4 d5 x x x separation adjust (3) set maker 101xxxxx s1u s1d s2u s2d x x x x pin dc cont. ic maker test 110xxxxx (test mode) 0 0 x x x x x x operating 1 0 x x x x x x slave zap 0 1 x x x x x x master zap 1 1 x x x x x x external clock 111xxxxx x x x x x x x x not use d1 d2 d3 d4 d5 d1 d2 d3 d4 d5 d1 d2 d3 d4 d5 0 0 0 0 0 (min) <--- 1 0 0 0 0 (typ) ----> 1 1 1 1 1 (max)
tv sound mpx for two carrier system s1a0688c01 17 control function description ? mode control: control the matrix structure according to broadcast status and end user ? s setting. s1a0688c01 has 4 modes (mono, stereo, bilingual and sub) ? mute control: when mute control is on, the audio output of s1a0688c01 is off. ? sep. adjust: the separation characteristic of s1a0688c01 in stereo mode can be controlled by iic bus. this option controls s2 fm demodulated output signal level so as to make the separation characteristic in best status. ? test mode: ic makers test item. dc control map (pin22: h) read mode in iic bus micom control mode s1a0688c01 can transmit the data which is registered inside ic to the micom in iic bus control system. if the 8th bit of module address is ? h ? , it means micom requests the data stored in the ic and s1a0688c01 enter data transmission mode. during the read mode, s1a0688c01 ignores the data the data of 2nd type (sub address) and transmits the internal data within the period of 3rd byte. the sda line of micom should be maintain h to accept transmitted data from ic. the format of read data is as follows.no dc (logic) input function scl sda 0 0 mono 1 0 stereo 0 1 bilingual 1 1 sub bit of 3rd byte 1 2 3 4 read mode 5 6 7 8 transmit data bi st bi st zc zc 0 1 0 0 1 1 mono option for ic maker (zc: ic test option) 1 0 0 1 bilingual 0 1 1 0 stereo others transmission error
s1a0688c01 tv sound mpx for two carrier system 18 others in iic bus control system, if the slave address is correct, the acknowledge signal will be generated by s1a0688c01 no matter the sub address is right or wrong, when sub address is wrong ic will do nothing. notes: 1. the characteristic of sif filter should be suitable to mpx sound system. we suggest to use murata co. products: sfsh4.5mcb and sfsh4.72mcb. 2. if you need to use two chip in one set (e.g. tvcr), you should separate the chips by select pin 28 voltage. when it is high or open, write =84h, read = 85h. when pin 28 is connected to ground, write =86h, read = 87h. 3. program control method: 1. under window 95 environment, extract kb22688b.zip 2. install: setup.exe 3. run kb22688b.exe 4. pc parallel port pin description: pin 1 2 3 19 signal sda scl en gnd
tv sound mpx for two carrier system s1a0688c01 19 test circuit r-out l- out vcc s1a0688c01 1 2 3 4 7 28 27 26 25 8 5 6 30 29 32 31 9 10 11 12 15 14 13 16 20 19 18 17 22 21 24 23 0.047 m f 0.047 m f 1 m f 1 m f 10 m f 10 m f 4.7 m f 0.039 m f 0.039 m f 10 m f 1m w 4.7 m f 100 m f 4.7 m f 10 m f sda scl en st tclk 1 m f 10 m f 0.1 m f 4.7 m f s s 0.047 m f 0.047 m f sif1 sif2 m m m bi m s m 47k w 47k w 47k w 47k w 47k w 0.1 m f 0.1 m f rcm s2 s1 vdd
s1a0688c01 tv sound mpx for two carrier system 20 application circuit r-out l- out 4.72mhz 3pf vcc s1a0688c01 1 2 3 4 7 28 27 26 25 8 5 6 30 29 32 31 9 10 11 12 15 14 13 16 20 19 18 17 22 21 24 23 0.047 m f 0.047 m f 4.5mhz 1 m f 1 m f 10 m f 10 m f 4.7 m f 0.039 m f 0.039 m f 10 m f 1m w 4.7 m f 100 m f 4.7 m f 10 m f sda scl en st n.c vdd 1 m f 100 m f 1 m f 0.1 m f n.c n.c n.c 4.7 m f 47k w 47k w 47k w 470 w 470 w

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