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asahi kasei [AK2531] ms0079-e-00 2001/03 1 AK2531 j1 (1.5m) / j2 (6.3m) ami transceiver feature - j1(1.544mbps) / j2(6.312mbps) ami cording transceiver(liu) - jitter tolerance: compliant with itu-t g.824 - transmitter pulse shape: compliant with jt-g.703 - loss of signal detection - line equalizer - local loopback function - crystal oscillator: 24.704mhz(1.5m), 25.248mhz(6.3m) - single 3.3v 5% or 5.0v 5% supply - low power consumption:170mw(typ:1.544mbps), 160mw(typ:6.322mbps) - package: 48pin lqfp block diagram clock &data recovery rtip rring rclk rpos rneg los pulse shaper ttip tring tneg tpos tclk local loopback los osc ref. line equalizer xtalin xtalout bgref
asahi kasei [AK2531] ms0079-e-00 2001/03 2 general description the AK2531 is the j1/j2(jt-g.703) transceiver for leased line, mux, base station for mobile communications etc. it includes pulse shaper, line driver, clock and data recovery, los detector, crystal oscillator, etc. in one package. internal equalizer automatically equalizes the receive pulse attenuated by the cable loss. pin assignments 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 36 35 34 33 32 31 30 29 28 27 26 25 48 47 46 45 44 43 42 41 40 39 38 37 (top view) nc tpos tneg tclk dvss dvdd dgnd rpos rneg rclk los nc nc pgnd xtalout xtalin nc ravdd ravss bgref nc eqcap eqbps nc nc tring tavdd tavss ttip nc test6 test5 nc rring rtip nc lpbck reset ps3v dr6m nc avdd avss test4 test3 test2 test1 nc
asahi kasei [AK2531] ms0079-e-00 2001/03 3 pin condition pin no. pin name i/o pin type ac load dc load comments 1 nc - note 1) 2 tpos i ttl/cmos ttl for 5v, cmos for 3.3v 3 tneg i ttl/cmos ttl for 5v, cmos for 3.3v 4 tclk i ttl/cmos ttl for 5v, cmos for 3.3v 5 dvss i power 6 dvdd i power 7 dgnd i power 8 rpos o cmos 50pf 9 rneg o cmos 50pf 10 rclk o cmos 50pf 11 los o cmos 50pf 12 nc - note 1) 13 nc - note 1) 14 pgnd i power 15 xtalout o analog 16 xtalin i analog 17 nc - note 1) 18 ravdd i power 19 ravss i power 20 bgref o analog 12kohm. connect to +/-1% accuracy resister 21 nc - note 1) 22 eqcap i/o analog 100nf connect to +/-10% accuracy capacitance 23 eqbps i ttl/cmos ttl/5v,cmos/3.3v 24 nc - note 1) 25 nc - note 1) 26 rtip i analog 27 rring i analog input impedance between the both pins is over 2kohm. 28 nc - note 1) 29 test5 o 30 test6 o 31 nc - note 1) 32 ttip o analog 15pf 33 tavss i power
asahi kasei [AK2531] ms0079-e-00 2001/03 4 pin no. pin name i/o pin type ac load dc load comments 34 tavdd i power 35 tring o analog 15pf 36 nc - note 1) 37 nc - note 1) 38 test1 39 test2 40 test3 41 test4 i ttl/cmos ttl for 5v, cmos for 3.3v 42 avss i power 43 avdd i power 44 nc - note 1) 45 dr6m i ttl/cmos ttl for 5v, cmos for 3.3v 46 ps3v i cmos note 2) 47 reset i ttl/cmos ttl for 5v, cmos for 3.3v 48 lpbck i ttl/cmos ttl for 5v, cmos for 3.3v note 1) should be connected to vss. note 2) should be connected vdd for 3.3v operation or vss for 5.0v operation.
asahi kasei [AK2531] ms0079-e-00 2001/03 5 pin descriptions pin name i/o function comments signal interface ttip o transmit positive data output tring o transmit negative data output tpos i transmit positive data input incoming data is sampled at the falling edge of tclk tneg i transmit negative data input incoming data is sampled at the falling edge of tclk tclk i transmit clock rtip i receive positive data input rring i receive negative data input rpos o receive positive data output fixed to low level during los status. rneg o receive negative data output fixed to low level during los status. rclk o receive clock output fixed to low level during los status. control interface dr6m i data rate select h : 6.322mbps l : 1.544mbps ps3v i power supply voltage select h : 3.3v supply l : 5.0v supply eqbps i equalizer bypass h : disable equalizer l : enable equalizer reset i reset active high input. fixed to vss for normal use. lpbck i loop back when lpbck=high, ttip and tring are loop back to rtip and rring. los o loss of signal if the incoming signal is lower than the loss of signal threshold for more than 25 ms, los pin is set to high. during the loss status, if the incoming signal becomes higher than the threshold, los pin is set to low within 125 us. test1-4 i test pin these pins are used only for tests. should be fixed to low for normal use. test5,6 o test pin these pins are used only for tests. should be float for normal use.
asahi kasei [AK2531] ms0079-e-00 2001/03 6 pin name i/o function comments power supply dvss i negative power supply for digital circuit dvdd i positive power supply for digital circuit dgnd i negative power supply for digital circuit pgnd i negative power supply for pad ravdd i positive power supply for the analog circuit ravss i negative power supply for the analog circuit tavss i negative power supply for analog circuit. tavdd i positive power supply for analog circuit. avss i negative power supply for analog circuit avdd i positive power supply for analog circuit bgref o current reference 12 k ? resister should be connected between this pin and ravss. others xtalout o xtalin i x-tal input / x-tal output x-tal should be connected between these pins. - 1.544mbps : 24.704mhz - 6.322mbps : 25.248mhz 20pf is the recommended value for the external capacitance connected between each of these pins and vss. eqcap i/o equalizer stability capatitor external capacitance (100nf 10%) should be connected to stabilize equalizer. nc - not connected. must be connected to vss except 29 and 30 pins. 29 and 30 pins must be left floating.
asahi kasei [AK2531] ms0079-e-00 2001/03 7 absolute maximum ratings parameter symbol min max units conditions dc supply vdd -0.3 6.5 v apply to tavdd, ravdd, avdd, dvdd ground level vss 0 0 v apply to pgnd, tavss, ravss, dvss, dgnd, avss note 1) digital input voltage vdin pgnd-0.3v dvdd+0.3v v analog input voltage vain pgnd-0.3v ravdd+0.3v v input current iin -10 10 ma storage temperature tstg -55 130 c note 1) pgnd tavss, ravss, dvss, dgnd, avss dgnd dvss recommended operating comditions parameter symbol min typ max units conditions dc supply (3.3v mode) 3.135 3.3 3.465 v 3.3v+/-5% dc supply (5.0v mode) ravdd,tavd ddvdd,avdd 4.75 5.0 5.25 v 5.0v+/-5% ambient operating temperature ta -10 25 +70 c electrical characteristics parameter symbol min typ max units conditions 1.5m pdh1 170 237 mw note1 vdd=5.0v 6.3m pdh2 160 231 mw note1 1.5m pdl1 122 174 mw note2 power consumption vdd=3.3v 6.3m pdl2 99 146 mw note2 note 1: 100% mark, load 110ohm note 2: 100% mark, load 75ohm
asahi kasei [AK2531] ms0079-e-00 2001/03 8 electrical characteristics dc characteristics parameter symbol min typ max units conditions 5.0v supply (ps3v=low) digital high-level output voltage voh 0.9dvdd v ioh=-40ua digital low-level output voltage vol 0.4 v iol=1.6ma digital high-level input voltage vih 2.4 v digital low-level input voltage vil 0.8 v 3.3v supply (ps3v=high) digital high-level output voltage voh 0.9dvdd v ioh=-40ua digital low-level output voltage vol 0.4 v iol=1.6ma digital high-level input voltage vih 0.7dvdd v digital low-level input voltage 1 vil 0.3dvdd v except eqbps and ps3v pin (note3) digital low-level input voltage 2 vile 0.6 v eqbps pin note 3: ps3v pin should be connected to dvdd for 3.3v supply and to dvss for 5.0v supply.
asahi kasei [AK2531] ms0079-e-00 2001/03 9 receiver parameter symbol min typ max units conditions input impedance 2 kohm equalizer off -6 0 db note 1, eqbps=?h? 1.544mbps equalizer on -18 -6 db note 1, eqbps=?l? sensitivity 6.312mbps -4.5 0 db note 2 loss of signal threshold 0.15 0.25 v 0p note 3 allowable consecutive zeros 60 bit note 4 s/x tolerance 16 db note 5 generated jitter 0.02 uipp jitter tolerance itu-t g.824 note 1: relative value to the reference level with 110ohm cable. (3.15v 0p 0.38) note 2: relative value to the reference level with 75ohm cable. (2.0v 0p 0.3%) note 3: level at the line side of transformer. note 4: the device will tolerate consecutive zeros with pn20 pattern. note 5: the frequency of interference signal is 700khz(1.544mbps) or 3mhz(6.312mbps). jitter tolerance (1.544mbps) 0.01 0.1 1 10 100 10 100 1000 10000 100000 jiiter frequency(hz) jitter amplitude(uipp) jitter tolerance (6.312mbps) 0.01 0.1 1 10 100 10 100 1000 10000 100000 jiiter frequency(hz) jitter amplitude(uipp)
asahi kasei [AK2531] ms0079-e-00 2001/03 10 transmitter parameter symbol min typ max units conditions 1.544mbps (dr6m=low) transmit pulse amplitude va 2.77 3.15 3.53 v 0p transmit pulse width 285 324 363 ns transmit pulse under-shoot -0.25va -0.75va v 0p jt-g703 note1 transmit data latency from tpos/tneg to ttip/tring 0.75 1 bit 6.312mbps (dr6m=high) transmit pulse shape jt-g703 note2 transmit pulse amplitude at normalized point 1.7 2.0 2.3 v 0p note2 transmit data latency from tpos/tneg to ttip/tring 1 1.5 bit note 1: measured at the line side of transformer terminated with 110ohm. (isolated pulse: ?1000?) note 2: measured at the line side of transformer terminated with 75ohm. (isolated pulse: ?1000?) isolated pulse mask 6.312mbps (jt-g.703) 0 0.5 1 1.5 2 2.5 -5 -4 -3 -2 -1 0 1 2 3 4 5 time [20ns/div] voltage[v]
asahi kasei [AK2531] ms0079-e-00 2001/03 11 ac characteristics (clock/data) parameter symbol min typ max units condi- tions notes 1.544mbps clock frequency 6.312mbps tclk fci1 fci2 1. 544000 6.312000 mhz 50ppm 30ppm tclk 40 60 % note 1 duty cycle rclk 46 54 % note 1 -20 20 ns 15pf load fig.1 delay time from rclk to rpos/rneg rclk rpos rneg t pd -25 25 ns 50pf load fig.1 setup/hold time from tclk to tpos/tneg tclk tpos tneg t su -15 15 ns fig.1 10 ns 15pf load fig.2 rise time/fall time rclk, rpos, rneg, los t r t f 20 ns 50pf load fig.2 note 1: duty cycle: ( t pwh / ( t pwh + t pwl ) ) 100% fig. 1 transmit/receive data timing fig. 2 rise and fall time ( rclk,rpos,rneg,tclk,tpos,tneg ) t pwl t pwh t pd t su rclk tclk rpos/rneg tpos/tneg 50% 50% 50% 50% t r t f 10% 10% 90% 90% valid
asahi kasei [AK2531] ms0079-e-00 2001/03 12 functional description power supply AK2531 operates at 3.3v or 5.0v. ps3v should be set to high for 3.3v or low for 5.0v. ps3v pin power supply h 3.3v l 5.0v data transfer rate AK2531 operates at the data rate of 1.544 mbps or 6.312 mbps. if you set dr6m pin to high, AK2531 goes into the mode for 6.312 mbps, or if you set dr6m pin to low, AK2531 goes into the mode for 1.544 mbps. depending on the data rate, mclk pin requires 24.704 mhz for 1.544mbps or 25.248 mhz for 6.312 mbps. dr6m pin data transfer rate mclk h 6.312mbps 25.248mhz l 1.544mbps 24.704mhz external components the external components shown in the table below should be connected to the appropriate pins depending on the operation voltage or data rate. 5.0v supply 3.3v supply 1.544mbps 6.312mbps 1.544mbps 6.312mbps turns ratio 1:1 1:1 1:1.4 1:1 load impedance 110ohm 75ohm 110ohm 75ohm receive side termination 55 ohm 37.5 ohm 28 ohm 37.5 ohm crystal frequency 24.704mhz 25.248mhz 24.704mhz 25.248mhz characteristics described in ?electrical characteristics? pulse shaper AK2531 samples the transmit data at tpos and tneg pins on the falling edge of tclk. the sampled incoming data are converted to ami signal and output at ttip and tring pins. if tclk is in loss, ami data is set to the space ?0? and is synchronized to the xtal.
asahi kasei [AK2531] ms0079-e-00 2001/03 13 line equalizer AK2531 equalizes the line loss of f characteristics. eqbps pin should be set as shown below. eqbps pin equalizer conditions of cable h bypassed 110 ? twisted pair up to 6db cable loss (1.544mbps mode) l enable 110 ? twisted pair from 6db to 18db cable loss (1.544mbps mode) 75 ? coax cable up to 4.5db cable loss (6.312mbps mode) local loopback if you set lpbck pin to high, AK2531 makes the transmit clock and the line driver output loopback to the receive clock and data input. in this mode, los pin is fixed to ?low?. lpbck pin mode operation h loopback tclk rclk ttip rtip tring rring l normal operation loss of signal if the received signal level is lower than the los threshold during 25ms(typ), AK2531 recognizes that status as loss of signal and los pin goes to ?high?. los pin returns to ?low? within 125us after the received signal level is beyond the los threshold. the states of each pin are shown below. state pin name normal operation loss of signal los l h rclk recovered clock l rpos recovered positive data l rneg recovered negative data l power on reset when the power supply for AK2531 rises within 10ms, AK2531 will be in the reset state for 15ms (max : guaranteed by design).
asahi kasei [AK2531] ms0079-e-00 2001/03 14 recommended external circuit transmitter 1 : n condition 1 : 1.4 1.544mbps, 3.3v 1 : 1 except above receiver 1 : n condition 1 : 1.4 1.544mbps, 3.3v 1 : 1 except above reference 12 k ? 1% resistor should be connected to determine the internal reference current. r1 is recommended to connect to AK2531 as short as possible to avoid noise. bgref AK2531 r1 r1=12k ? 1% a k2531 ttipx tring c1 c1= 0.47uf vdd vdd 1 : n vdd r1 = r2 = 28 ? ( 3.3v, 1.544mbps ) 55 ? ( 5.0v, 1.544mbps ) 37.5 ? ( 6.312mb p s ) a k2531 rtipx rringx r1 vdd r2 c1 c1 = 0.47uf 1 : n
asahi kasei [AK2531] ms0079-e-00 2001/03 15 power supply AK2531 has 4 paths for the power supply such as ravdd-ravss,tavdd-tavss,avdd-avss and dvdd-dvss. to decouple the power supplies, as shown below, c1, c2 capacitors should be connected between those power supplies respectively. these should be connected to AK2531 as short as possible. the table below shows a typical recommended value. these values depend on the condition of the power supply line on user?s board. please decide the value of the capacitors based on your evaluation. equalizer stability capacitor x-tal osc pin name c1 c2 ravdd-ravss, avdd-avss 1uf 0.1uf dvdd-dvss, tavdd-tavss 1uf 0.01uf eqcap AK2531 c1 c1=100nf10% xtal: 1.544mbps : 24.704 mhz 50 ppm 6.312mbps : 25.248 mhz 50 ppm c1 = c2 = 20 pf (max 25pf) xtalin AK2531 c1 c2 xtalou vdd AK2531 c1 c2 tavdd ravdd avdd dvdd tavss ravss avss dvss
asahi kasei [AK2531] ms0079-e-00 2001/03 16 package 48pin lqfp marking a k2531 xxxxyzz akm outline dimensions units: mm 9.00.4 7.0 36 37 25 24 7.0 13 0.50 9.00.4 48 1 12 0.18+0.1 ? 0.05 1.7max 0.10 0.10.1 0.125+0.05 ? 0.025 0.500.2 0~10 1.40.1 1.0 (1) pin #1 indication (2) date code: 7digits xxxxyzz (3)marketing code: AK2531 (4) akm logo
asahi kasei [AK2531] ms0079-e-00 2001/03 17 important notice ? these products and their specifications are subject to change without notice. before considering any use or application, consult the asahi kasei microsystems co., ltd. (akm) sales office or authorized distributor concerning their current status. ? akm assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. ? any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. ? akm products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and akm assumes no responsibility relating to any such use, except with the express written consent of the representative director of akm. as used here: (a) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. (b) a critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. ? it is the responsibility of the buyer or distributor of an akm product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification.

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