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1/25 MSM7557 ? semiconductor general description the MSM7557 is a single chip msk modem with base band voice processor for cordless telephone. the MSM7557 voice transmit block consists of high pass filter, compressor, pre-emphasis, limiter and splatter filter. voice receive block consists of band pass filter, de-emphasis and expander. features ? ? ? ? ? available to transmit modem signal and also transmit base band voice signal through wireless transmission path (0.3 khz to 3.4 khz) ? ? ? ? ? built-in compandor circuit ? ? ? ? ? upper limit of voice band (3306 hz/3400 hz/3500 hz) is selectable ? ? ? ? ? modem bit rate (2400/1200 bps) is selectable ? ? ? ? ? transmit function and receive function operate separately ? ? ? ? ? emphasis mode selectable ? ? ? ? ? built-in bit synchronous detector and frame synchronous detector ? ? ? ? ? built-in limiter level generator and external limit voltage input ? ? ? ? ? dynamic range selectable ? ? ? ? ? built-in crystal oscillator circuit ? ? ? ? ? wide range power supply voltage (2.7v ~ 5.5v) ? ? ? ? ? package : 56-pin plastic qfp (qfp56-p-910-0.65-2k) (product name : MSM7557gs-2k) ? semiconductor MSM7557 single chip msk modem with compandor for cordless telephone e2a0046-16-x1 this version: jan. 1998 previous version: nov. 1996
2/25 MSM7557 ? semiconductor block diagram tvio tvi sd st br vr1 vr2 vr3 byp vdd gnd sg x1 x2 raio rai pdn cmpi cc1 cc2 cc3n cc3p lim C + tao sec dyn tve me emp rck1 rck2 rd rt fd fps bit fde csh rvo rve ce1 ce2 ce3n ce3p C + com- pressor hpf1 pre- emphasis limiter splatter filter rc- lpf cont flame det shaper rc- lpf expander hpf2 rbpf de- emphasis voltage ref pdn osc sg mix lpf mixer dem- bpf demod rc- lpf mod
3/25 MSM7557 ? semiconductor pin configuration (top view) nc 1 st 2 emp 3 lim 4 nc 5 vr1 6 vr2 7 vr3 8 nc 9 tvio 10 cmpi 11 tvi 12 cc1 13 cc2 14 nc 42 bit 41 fde 40 br 39 byp 38 rck2 37 rck1 36 sec 35 csh 34 rai 33 nc 32 raio 31 ce3p 30 nc 29 nc 15 cc3n 16 cc3p 17 dyn 18 sg 19 nc 20 (vdd) 21 gnd 22 tao 23 rvo 24 ce1 25 ce2 26 ce3n 27 nc 28 sd 56 tve 55 me 54 x2 53 x1 52 nc 51 pdn 50 vdd 49 rve 48 rt 47 rd 46 fd 45 fps 44 nc 43 notes: the pin 49 should be used for v dd . the pin 21 should be connected to v dd or opened. nc : no connect p in
4/25 MSM7557 ? semiconductor pin description name sd emp pre-emphasis circuit is bypassed to the path de-emphasis circuit is bypassed to the path description t ms me sd input st modulator input data transmit side receive side dyn 0 0.50 v C9 dbv internal clamp level limiter level st emp lim 0 1 pre-emphasis circuit is connected to the path de-emphasis circuit is connected to the path transmit data input. the data on sd pin are took into msk modulator and the data are available on the positive edge of st. in order to synchronize a receive modem, more than 18bits bit-synchronous signal should be transmitted before data transmission. if s/n ratio of the receive signal is always good, more than 11bits bit-synchronous signal synchronizes the receiver. transmit data timing clock output. when digital "0" is put on me pin, st is fixed to digital "1" level. emphasis path selection. deviation limiter control. voice signal maximum rf modulation level is controlled by connecting external reference voltage to this pin. input impedance of this pin is about 200 k w. when this pin is left open, internal reference voltage is used as the clamp level. internal clamp level is as follows. this internal clamp level is made by internal reference voltage which is unrelated with v dd . negative clamp level is made by internal operational amplifier and the voltage is reversed at vsg. 1 1.26 v C1 dbv
5/25 MSM7557 ? semiconductor (continued) name vr1 vr2 vr3 modulator output level control. refer to the following figure. description + C from modulator + C to transmit filter vr1 vr2 vr3 r1 r2 r1 3 40 k w r2 3 40 k w r1 3 r2 + C c1 r3 r5 c2 r4 c3 tvio tvi sg vtvi cmpi compressor r5 3 60 k w c1 and c19 are used for dc cut. example of fc = 10 khz and 0 db gain r3 = r4 = r5 = 68 k w c1 = 0.22 m f, c2 = 510 pf, c3 = 110 pf c19 tvio tvi cc1 cc2 cc3n cc3p v tao = 20 log (r2/r1) C 9 dbv (dyn = "0" ) v tao = 20 log (r2/r1) C 1 dbv (dyn = "1" ) this level is made from internal voltage reference, so this level doesn't depend on power supply voltage. transmit side rc active filter input (tvi) and output (tvio). if over 50 khz frequency element is in the input signal, folding noise is generated from internal scf circuit, so second order rc-active filter is needed. (fc = 10 khz) when digital "1" is applied to tve pin, transmit voice signal comes out to tao. capacitor connection pins to remove for dc offset of the compressor. a 1 m f capacitor between sg pin and each pin should be connected. capacitor connection pins for the compressor attack and recovery time. when dyn is digital "0" level, a 0.22 m f capacitor should be connected between cc3n and cc3p. and when dyn is digital "1" level, a 0.47 m f capacitor should be connected between them.
6/25 MSM7557 ? semiconductor (continued) name description me tve tao x : don't care rve rvo 0 1 output disable (potential = sg) output enable cmpi dyn sg gnd tao rvo ce1 ce2 ce3n ce3p raio rai csh 00 01 1x no signal output (potential = sg) voice signal output msk modulator output compressor circuit input. a 0.47 m f capacitor should be connected between cmpi and tvio. dynamic range control input. for an application of which v dd is always higher than 4.5 v (base station), by setting dyn = "1", modem transmit carrier level, typical input signal level, limiter clamp level and compandor standard input level are up about 8db to improve s/n ratio. for an application of which v dd is lower than 4.5 v (hand-set) dyn shall be digital "0". to make easier interface with the rf part, one solution is to put digital "0" on dyn pin for both base station and handset. built-in analog signal ground. the dc voltage is half of v dd . to make this voltage source impedance lower and to ensure the device performance, it is necessary to put a bypass capacitor of more than 1 m f between sg and v dd in close physical proximity to the device. ground pin, (0v). transmit analog signal output. according to control data on me and tve, tao is set as follows. receive voice signal output. rvo pin state is defined by rve control. capacitor connection pins to remove dc offset of the expander. a 1 m f capacitor between sg pin and each pin should be connected. capacitor connection pins for the expander attack time and recovery time. when dyn is digital "0" level, a 0.22 m f capacitor should be connected between ce3n and ce3p. and when dyn is digital "1" level, a 0.47 m f capacitor should be connected between them. receive side amplifier input (rai) and output (raio). second order rc-active filter is needed like tvio and tvi. refer to tvio and tvi pin description. capacitor connection pin to remove dc offset of the modem shaper circuit. a 1 m f capacitor should be connected between gnd pin and csh.
7/25 MSM7557 ? semiconductor (continued) name sec device test input. sec shall be connected to gnd. function byp 0 transmit side receive side compressor is connected to the path. expander is connected to the path. rck1 0 x 1 3306 hz 3400 hz 3500 hz upper limit of voice band rck2 1 0 1 br modem data signaling rate select pin. 1200 bps date signaling rate 0 br rck1 rck2 byp voice band select. compandor path selection. 1 compressor is bypassed to the path. expander is bypassed to the path. 2400 bps 1
8/25 MSM7557 ? semiconductor (continued) name function bit fps detect pattern receiver v dd power supply. this device is sensitive to power supply noises as switched capacitor tequniques are utilized. a bypass capacitor of more than 10 m f between v dd and gnd pin should be connected to ensure the performance. (note : this pattern is for japanese cordless telephone.) rve rt rd fd fps bit fde frame synchronous signal detector control. when digital "0" is applied to this pin, fd pin is fixed to "0" level. rt and rd always work. when digital "1" is applied to this pin, frame synchronous detector works, and rt and rd pins are fixed to "1" level untill synchronous signal detector detects frame synchronous signal and fd becomes "1" level. refer to fig.3 (receive signal timing). bit synchronous signal detector control. when bit and fde pins are digital "1" level and when bit synchronous signal and frame synchronous signal are detected continously, fd becomes digital "1". when bit pin is digital "0" level and fde pin is digital "1" level and when 16-bit frame synchronous signal is detected, fd pin becomes digital "1" level. refer to fps pin detection. frame synchronous pattern control. frame synchronous detector output. when receive data correspond to detection pattern, fd pin is held to digital "1" level. when fde is applied to digital "0" level, fd pin is reset to digital "0" level. and at the full power down state (pdn = "1", rve = "0" ), fd pin is reset to digital "0" level. demodulator serial data output. the data are synchronized with the re-generated timing clock of rt. when fde is digital "1" level and also fd is digital "0" level, rd is fixed to digital "1" level. receive data timing clock output. this signal is re-generated by internal digital pll. the falling edge of this clock output is coincident with the transitions of rd. the rising edge of rt can be used to latch the valid receive data. when fde pin is applied to digital "1" level and also fd pin output digital "0" level, rt pin is fixed to digital "1" level. refer to fig.3. receive voice signal control. refer to rvo pin description. (=9336h) (=c4d6h) (=a9336h) (=ac4d6h) handset side base station handset side base station 1001 0011 0011 0110 1100 0100 1101 0110 1010 1001 0011 0011 0110 1010 1100 0100 1101 0110 0 0 1 1 0 1 0 1
9/25 MSM7557 ? semiconductor (continued) name pdn power down control. power down state is controlled by pdn, me, rve, and tve. function pdn me rve tve voice control path transmit side modem receive side modem 1 x 0 x off off off mode1 others x : don't care x1 x2 me tve at the mode 4, all functions are powered on. at the full power down mode(pdn = "1" and rve = "0"), the demodulator circuit and fd pin are reset. when v dd is turned on, the demodulator circuit and fd pin should be reset by setting mode1. crystal connection. 3.6864 mhz crystal shall be connected. when an external master clock is applied, the clock should be supplied to x2 pin via a 200 pf capacitor for ac coupling and x1 should be opened. msk moudulator output. when digital "1" is applied to this pin, msk modulator is connected to the splatter filter. refer to tao pin description. transmit side voice signal contorol. refer to tao pin description. mode2 mode3 mode4 1 0 x 1 1 0 x 0 off off on off on on on on on
10/25 MSM7557 ? semiconductor absolute maximum ratings recommended operating conditions symbol rating *1 : lim, vr2, tvi, rai, cmpi parameter unit condition v dd C0.3 to +7.0 power supply voltage v ia C0.3 to v dd + 0.3 analog input voltage *1 ta = 25c refer to gnd v id digital input voltage *2 v t stg C55 to +150 storage temperature c *2 : sd, emp, dyn, sec, rck1, rck2, byp, br, fde, bit, fps, rve, pdn, x2, me, tve 2.7 3.6 v dd v from gnd level dyn = "0" 5.5 v dd = 2.7 v to 5.5 v parameter symbol condition min. typ. max. unit power supply voltage operating temperature crystal oscillating freq. data signaling rate c4, c5, c11, c12, c15 c6, c13 c7, c8 c9, c10 c14 c19 c20, c21 t op f x'tal t s br = 0" br = "1" dyn = "0" dyn = "1" rl 3 40k w dyn= "1" 4.5 C30 3.6860 1.0 0.22 0.47 1.0 0.22 10 0.47 20 2400 1200 5.0 +25 3.6864 5.5 +70 3.6868 c mhz bit/sec m f pf
11/25 MSM7557 ? semiconductor electrical characteristics dc characteristics normal mode (mode 4) dyn = "0" : v dd = 2.7 v to 5.5 v, ta = C30c to 70c dyn = "1" : v dd = 4.5 v to 5.5 v, ta = C30c to 70c *1 refer to pdn pin description *2 sd, emp, dyn, sec, rck1, rck2, byp, br, fde, bit, fps, rve, pdn, me, tve *3 st, fd, rd, rt parameter symbol condition min. typ. max. unit power supply current *1 input leakage current *2 input voltege *2 output voltege *3 i dd i dds1 i dds2 i dds3 i il i ih i il i ih v ol v oh power down mode 1 power down mode 2 power down mode 3 3.6 v 5.5 v 5.5 v 3.6 v v in = 0 v v in = v dd i ol = C20 m a i oh = 20 m a C10 0 0.7v dd 0 0.8v dd 9.0 14.0 1.0 3.8 4.6 18 24 20 7.0 9.0 +10 0.2v dd v dd 0.1v dd v dd ma m a ma m a v
12/25 MSM7557 ? semiconductor ac characteristics 1200 bps 2400 bps *1 receive msk si g nal is bit s y nchronous si g nal (modulated si g nal of alternatin g "0", "1" p attern). dyn = "0" : v dd = 2.7 v to 5.5 v, ta = C30c to 70c dyn = "1" : v dd = 4.5 v to 5.5 v, ta = C30c to 70c number of data bits required for the pll to be locked in within the phase difference of 22.5 or less number of data bits required for the pll to be locked in within the phase difference of 90 or less transmit carrier frequency transmit carrier level receive carrier input level bit error rate number of pll lock-in data bits *1 parameter symbol condition min. typ. max. unit f m1 f s1 f m2 f s2 v ox v ir b er v ir br = "0" sd= "0" sd = "1" sd= "0" r1 = r2 defined at raio me= "1" br = "1" me= "1" dyn = "0" dyn = "1" 8 db 10 db 11 db 13 db 1199 1799 1199 2399 C11 C3 C32 1 10 -3 1200 1800 1200 2400 C9 C1 5 10 -5 1 10 -3 5 10 -5 1201 1801 1201 2401 C7 +1 C2 18 11 hz dbv bit sd = "1"
13/25 MSM7557 ? semiconductor voice signal interfaces rvo maximum output signal level C6 v out min. dyn = "0" dyn = "1" dyn = "0" dyn = "1" 100 hz f in = 1 khz byp = "0" *1 r cv. ? t ran. *1 s/d 3 20 db *2 f in = 1 khz, byp = emp = "1" *2 cross talk dyn = "0" : v dd = 2.7 v to 5.5 v, ta = C30c to 70c dyn = "1" : v dd = 4.5 v to 5.5 v, ta = C30c to 70c limiter clamp level transmit output distortion receive output distortion transmit gain receive gain transmit idle noise receive idle noise transmit filter response receive filter response v lim h dt h dr g t g r h it h ir c tt c tr ft1 ft3 ft25 ft34 ft60 fr1 fr3 fr25 fr34 fr60 +2 C8 0 +1 +1 C60 C60 C23 C8.5 +9.5 +12.5 C30 +4.5 +11.0 C6.5 C8.5 C30 C9 C1 C40 C40 C0.2 C0.2 C51 C85 C75 C80 C28 C10.5 +8.0 +10.5 C40 +3.0 +9.5 C8.0 C10.5 C40 C10 C2 C1.5 C1.5 C12.5 +6.5 +8.5 +1.5 +8.0 C9.5 C12.5 300 hz 2.5 khz 3.4 khz 6 khz 100 hz 300 hz 2.5 khz 3.4 khz 6 khz f in = 1 khz lim = open f in = 1 khz, C12 dbv byp = "0", emp = "1" f in = 1 khz, byp = emp = "1" f in = 1 khz, byp = emp = "1" byp = "0" emp = "1" raio = C2 dbv tvio = C2 dbv emp = "1" byp = "1" rck2 = "0" ref. = 1 khz emp = "1" byp = "1" rck2 = "0" ref. = 1 khz t ran. ? r cv. typ. max. unit condition symbol parameter dbv db dbv db
14/25 MSM7557 ? semiconductor (continued) parameter standard input level f in = 1 khz C13.7 C11.3 dbv C16.1 dyn = "0" compressor expander *3 0 db is defined as the input level and the output level when the standard input level is input. *4 v dd = 3.6 v, dyn = "0" *5 v dd = 5.0 v, dyn = "0" *6 v dd = 5.0 v, dyn = "1" dyn = "0" : v dd = 2.7 v to 5.5 v, ta = C30c to 70c dyn = "1" : v dd = 4.5 v to 5.5 v, ta = C30c to 70c maximum input level output level *3 attack time recovery time standard input level maximum output level output level attack time recovery time v ics v icm gc2 gc4 gc5 t at1 t at2 t re1 t re2 v ies v iem ge1 ge2 ge3 t at3 t at4 t re3 t re4 f in = 1 khz dyn = "0", c6 = 0.22 m f dyn = "1", c6 = 0.47 m f dyn = "0", c6 = 0.22 m f dyn = "1", c6 = 0.47 m f f in = 1 khz f in = 1 khz *3 dyn = "0", c13 = 0.22 m f dyn = "1", c13 = 0.47 m f dyn = "0", c13 = 0.22 m f dyn = "1", c13 = 0.47 m f C3.9 C7 +1.0 C9.2 C18.6 C8.7 C9.1 C1.5 C6 +2 C18.3 C37.5 C5.5 C9.9 C19.8 C29.5 3.4 3.5 17 16 C10.8 C11.2 C3.1 C20 C40 C59 3.4 3.5 17 16 C7.1 C10.6 C21.0 C12.9 C13.3 C4.7 C21.5 C42.2 dyn = "1" dyn = "0" dyn = "1" C20 db C40 db C60 db *4 *5 *6 dyn = "0" dyn = "1" C10 db C20 db C30 db db ms dbv db ms symbol condition min. typ. max. unit
15/25 MSM7557 ? semiconductor common characteristics digital timing characteristics *1 vr1, vr3, tao, rvo, raio dyn = "0" : v dd = 2.7 v to 5.5 v, ta = C30c to 70c dyn = "1" : v dd = 4.5 v to 5.5 v, ta = C30c to 70c parameter symbol condition min. typ. max. unit input resistance output resistance output load resistance output dc voltage r ia r ic r ox 1 r ox 2 r ox 3 rxl1 rxl2 v sg v ao tvi, rai, vr2 lim tao vr1, vr3, rvo tvio, raio s/d 3 20 db sg tao, rvo *1 tvio 40 60 v dd C 0.1 2 v dd 2 v dd + 0.1 2 v dd C 0.15 2 v dd 2 v dd + 0.15 2 10 200 1750 600 100 m w k w w k w v dyn = "0" : v dd = 2.7 v to 5.5 v, ta = C30c to 70c dyn = "1" : v dd = 4.5 v to 5.5 v, ta = C30c to 70c parameter symbol condition min. typ. max. unit transmit data set-up time transmit data hold time receive data output delay sync-signal output delay (me ? st) t s t h t d t ms refer to fig. 1 refer to fig. 1 refer to fig. 1 1 1 C300 0 834 300 m s ns m s
16/25 MSM7557 ? semiconductor timing diagram figure 1 input data timing figure 2 output data timing figure 3 receive signal timing rt fd,rd 50% 50% t d st sd 50% 50% t h t s fde rt internal rd fd rd d1 d2 d3 d1 d2 d3 n-2 n-1 n n-2, n-1, n : frame shnchronous signal
17/25 MSM7557 ? semiconductor operation description limiter circuit a + C r11 r12 lim hpf1 or pre C emphasis limiter reverse splatter filter r11 : 1 k w r12 : 200 k w dyn = "0" : clamp level = vsg 0.50 v dyn = "1" : clamp level = vsg 1.26 v 2. in case of using external voltage reference lim pin shall be supplied over vsg voltage. notes 1 ) r11 is protection resister from external extra voltage. 2 ) resistor value of r11 and r12 changes 0.7 to 1.3 times from the typical value by lot variation and temperature variation.
18/25 MSM7557 ? semiconductor frame detection pattern is defined by bit and fps. fig 3 shows detection timing first, put digital "0" level to fde pin more than 1 ms, then fd pin is reset to "0" level. next, put digital "1" level to fde pin, then rt and rd output digital "1" level until frame synchronous signal detected. when synchronous pattern is detected, fd pin is held to digital "1" level. at the full power down state (pdn = "1", rve = "0"), fd pin becomes reset state. in order to detect frame synchronous signal certainly, receive side pll should be locked in sufficiently. when a modem starts data transmittion, the bit-synchronous signal of more than 18 bits should be transmitted before frame pattern of the upper table. frame detector frame detection signal fde internal rd full power down signal (internal signal) dq q ck fd rt rd dq q ck internal rt bit fps sync-pattern note m.t. = master telephone s.h. = slave handset receiver 0 0 1 1 0 1 0 1 9336h c4d6h a9336h ac4d6h s.h. m.t. s.h. m.t. frame synchronous frame synchronous bit + frame synchronous bit + frame synchronous
19/25 MSM7557 ? semiconductor application circuit MSM7557gs-2k sd st emp lim tve me x1 pdn x2 transmit data transmit data timing clock emphasis path select limiter circuit clamp voltage input r1 r2 c19 r5 c3 r3 c1 c2 r4 c4 c5 c6 transmit voice input vr1 vdd vr2 vr3 rve cmpi tvio rt tvi rd cc1 fd cc2 fps cc3n fde cc3p bit dyn br sg dynamic range select c7 c8 v dd c9 c10 transmit signal output receive voice output c11 c12 c13 C + c15 c16 r7 r6 r8 c18 c17 modem data signaling rate select frame synchronous detector control gnd tao rvo ce1 ce2 ce3n ce3p sec csh note : an arrow mark of ( ) indicates connection to the sg pin. + C transmit voice output control msk modulator control 3.6864 mhz power down control c20 c21 c14 power supply receive voice output control receive timing clock receive data frame synchronous detector output synchronous pattern select bit synchronus detector control raio rai receive signal input rck1 rck2 voice band select byp compandor path select
20/25 MSM7557 ? semiconductor MSM7557 filter characteristics MSM7557 has wide band filters (0.3 khz to 3.4 khz) as follows. pre-emphasis ........................................................................................................ fig. 4 splatter filter ........................................................................................................ fig. 5 rbpf ....................................................................................................................... fig. 6 de-emphasis ......................................................................................................... fig. 7 transmit total (hpf1 + pre-emphasis + splatter) ......................................... fig. 8 receive total (rbpf + de-emphasis) ............................................................... fig. 9 transmit and receive total ................................................................................ fig. 10 fig. 4 to fig. 10 show the filter characteristics when rck2 is digital "0". when rck1 is digital "0" and rck2 is digital "1", the filter characteristics change 0.972 times on the frequency axis. (pass-band becomes narrow) when rck1 is digital "1" and rck2 is digital "1", the filter characteristics change 1.029 times on the frequency axis. (pass-band becomes wide)
21/25 MSM7557 ? semiconductor figure 4 MSM7557 preCemphasis 10 0 C10 C20 C30 freq [hz] level [db] 100 1k 10k figure 5 MSM7557 splatter filter 0 C10 C20 C30 C40 C50 C60 C70 C80 freq [hz] level [db] 100 1k 10k f cut (C0.2 db) = 3.4 khz
22/25 MSM7557 ? semiconductor figure 6 MSM7557 rbpf 0 C10 C20 C30 C40 C50 C60 C70 C80 freq [hz] level [db] f cut (C0.2 db) = 3.4 khz 100 1k 10k figure 7 MSM7557 deCemphasis 20 10 0 C10 C20 freq [hz] level [db] 100 1k 10k
23/25 MSM7557 ? semiconductor figure 8 MSM7557 transmit total (hpf1 + preCemphasis+splatter) 10 0 C10 C20 C30 C40 C50 C60 C70 freq [hz] level [db] 100 1k 10k figure 9 MSM7557 receive total (rbpf + deCemphasis) freq [hz] level [db] 100 1k 10k 10 0 C10 C20 C30 C40 C50 C60 C70
24/25 MSM7557 ? semiconductor figure 10 MSM7557 transmit and receive total freq [hz] level [db] 100 1k 10k 0 C10 C20 C30 C40 C50 C60 C70 C80
25/25 MSM7557 ? semiconductor (unit : mm) package dimensions notes for mounting the surface mount type package the sop, qfp, tsop, soj, qfj (plcc), shp and bga are surface mount type packages, which are very susceptible to heat in reflow mounting and humidity absorbed in storage. therefore, before you perform reflow mounting, contact okis responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). qfp56-p-910-0.65-2k package material lead frame material pin treatment solder plate thickness package weight (g) epoxy resin 42 alloy solder plating 5 m m or more 0.43 typ. mirror finish

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