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? semiconductor msm7578h/7578v/7579 1/18 ? semiconductor msm7578h/7578v/7579 single rail codec general description the msm7578 and msm7579 are single-channel codec cmos ics for voice signals ranging from 300 to 3400 hz. these devices contain filters for a/d and d/a conversion. designed especially for a single-power supply and low-power applications, these devices are particularly optimized for telephone terminals in digital wireless systems and isdn systems. the devices use the same transmission clocks as those used in the msm7508b and msm7509b. the analog output signal can directly drive a piezoelectric type handset receiver. features ? single power supply: +5.0 v 5% ? low power consumption operating mode: 25 mw typ. 47 mw max. v dd = 5 v power down mode: 0.05 mw typ. 0.3 mw max. v dd = 5 v ? itu-t companding law msm7578h: m -law msm7579: a-law msm7578v: m /a-law pin-selectable ? built-in pll eliminates a master clock ? serial data rate: 64/128/256/512/1024/2048 khz 96/192/384/768/1536/1544/200 khz ? adjustable transmit gain ? built-in reference voltage supply ? directly drive a line transformer of 600 w ? the 16-pin dip and 24-pin sop package products provide pin compatibility with the msm7508b/ 7509b ? the 20-pin ssop package products have 1/3 the foot print of conventional products ? package options: 16-pin plastic dip (dip16-p-300-2.54) (product name : msm7578hrs) (product name : msm7579rs) (product name : MSM7578VRS) 24-pin plastic sop (sop24-p-430-1.27-k) (product name : msm7578hgs-k) (product name : msm7578vgs-k) (product name : msm7579gs-k) 20-pin plastic ssop (ssop20-p-250-0.95-k) (product name : msm7578hms-k) (product name : msm7579ms-k) (product name : msm7578vms-k) e2u0017-28-81 this version: aug. 1998 previous version: nov. 1996
? semiconductor msm7578h/7578v/7579 2/18 block diagram rc lpf 8th bpf ad conv. tcont auto zero 5th lpf da conv. pwd logic pll rtim rcont pcmout pcmin pdn v dd ag dg sg gen sgc sg pwd C + ainC ain+ gsx C + aout sg rsync bclk xsync (alaw) vr gen
? semiconductor msm7578h/7578v/7579 3/18 pin configuration (top view) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 sgc sg aout v dd dg pdn rsync ain+ ainC gsx (alaw)* ag xsync 16-pin plastic dip pcmin pcmout 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 sgc nc sg aout v dd nc nc pdn ain+ ainC nc gsx (alaw)* bclk nc nc : no connect pin rsync pcmin xsync pcmout nc : no connect pin bclk dg ag 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 sgc sg aout nc v dd pdn rsync ain+ ainC gsx xsync pcmin pcmout dg ag bclk (alaw)* nc nc nc nc nc nc 24-pin plastic sop 20-pin plastic ssop * the alaw pin is only applied to the MSM7578VRS/msm7578vgs-k/msm7578vms-k.
? semiconductor msm7578h/7578v/7579 4/18 pin and functional descriptions ain+, ainC, gsx transmit analog input and transmit level adjustment. ain+ is a non-inverting input to the op-amp; ainC is an inverting input to the op-amp; gsx is connected to the output of the op-amp and is used to adjust the level, as shown below. when not using ainC and ain+, connect ainC to gsx and ain+ to sg. during power saving and power down modes, the gsx output is at ag voltage. C + ainC ain+ c1 analog input 1) inverting input type r1 : variable r2 > 20 k w c1 > 1/(2 3.14 30 r1) gain = r2/r1 10 r2 gsx sg + C ain+ ainC 2) non inverting input type r3 > 20 k w r4 > 20 k w r5 > 50 k w c2 > 1/ (2 3.14 30 r5) gain = 1 + r4 / r3 10 r4 gsx sg c2 analog input r3 r5 r1 ag analog signal ground. aout analog output. the output signal has a maximum amplitude of 2.4 v pp above and below the signal ground voltage (v dd /2). the output load resistance is a minimum of 600 w . during power saving, or power down mode, the output of aout is at the voltage level of the signal ground.
? semiconductor msm7578h/7578v/7579 5/18 v dd power supply for +5 v. pcmin pcm signal input. a serial pcm signal input to this pin is converted to an analog signal in synchronization with the rsync signal and bclk signal. the data rate of the pcm signal is equal to the frequency of the bclk signal. the pcm signal is shifted at a falling edge of the bclk signal and latched into the internal register when shifted by eight bits. the start of the pcm data (msd) is identified at the rising edge of rsync. bclk shift clock signal input for the pcmin and pcmout signal. the frequency, equal to the data rate, is 64, 96, 128, 192, 256, 384, 512, 768, 1024, 1536, 1544, 2048, or 200 khz. setting this signal to logic 1 or 0 drives both transmit and receive circuits to the power saving state. rsync receive synchronizing signal input. eight required bits are selected from serial pcm signals on the pcmin pin by the receive synchronizing signal. signals in the receive section are synchronized by this synchronizing signal. this signal must be synchronized in phase with the bclk. the frequency should be 8 khz 50 ppm to guarantee the ac characteristics which are mainly the frequency characteristics of the receive section. however, if the frequency characteristic of an applied system is not specified exactly, this device can operate in the range of 8 khz 2 khz, but the electrical characteristics in this specification are not guaranteed. xsync transmit synchronizing signal input. the pcm output signal from the pcmout pin is output in synchronization with this transmit synchronizing signal. this synchronizing signal triggers the pll and synchronizes all timing signals of the transmit section. this synchronizing signal must be synchronized in phase with bclk. the frequency should be 8 khz 50 ppm to guarantee the ac characteristics which are mainly the frequency characteristics of the transmit section. however, if the frequency characteristic of an applied system is not specified exactly, this device can operate in the range of 8 khz 2 khz, but the electrical characteristics in this specification are not guaranteed. setting this signal to logic 1 or 0 drives both transmit and receive circuits to the power saving state.
? semiconductor msm7578h/7578v/7579 6/18 dg ground for the digital signal circuits. this ground is separate from the analog signal ground. the dg pin must be connected to the ag pin on the printed circuit board to make a common analog ground. pdn power down control signal. a logic "0" level drives both transmit and receive circuits to a power down state. pcmout pcm signal output. the pcm output signal is output from msd in a sequential order, synchronizing with the rising edge of the bclk signal. msd may be output at the rising edge of the xsync signal, based on the timing between bclk and xsync. this pin is in a high impedance state except during 8-bit pcm output. it is also in a high impedance state during power saving or power down mode. a pull-up resistor must be connected to this pin because its output is configured as an open drain. this device is compatible with the itu-t recommendation on coding law and output coding format. the msm7579 (a-law) outputs the character signal, inverting the even bits. input/output level +full scale +0 C0 Cfull scale pcmin/pcmout msm7578h ( m -law) msd 1000 0000 1111 1111 0111 1111 0000 0000 msm7579 (a-law) msd 1010 1010 1101 0101 0101 0101 0010 1010
? semiconductor msm7578h/7578v/7579 7/18 sg signal ground voltage output. the output voltage is 1/2 of the power supply voltage. the output drive current capability is 300 m a. this pin provides the sg level for codec peripherals. this output voltage level is undefined during power saving or power down mode. sgc used to generate the signal ground voltage level by connecting a bypass capacitor. connect a 0.1 m f capacitor with excellent high frequency characteristics between the ag pin and the sgc pin. alaw control signal input of the companding law selection. provides only for the MSM7578VRS/7578vgs-k/7578vms-k. the codec will operate in the m -law when this pin is at a logic "0" level and the codec will operate in the a-law when this pin is at a logic "1" level. the codec operates in the m -law if the pin is left open, since the pin is internally pulled down.
? semiconductor msm7578h/7578v/7579 8/18 absolute maximum ratings parameter power supply voltage analog input voltage digital input voltage storage temperature symbol v dd v ain v din t stg condition rating 0 to 7 C0.3 to v dd + 0.3 C0.3 to v dd + 0.3 C55 to +150 unit v v v c recommended operating conditions parameter symbol power supply voltage analog input voltage input high voltage input low voltage clock frequency sync pulse frequency clock duty ratio digital input rise time digital input fall time transmit sync pulse setting time receive sync pulse setting time sync pulse width pcmin set-up time pcmin hold time digital output load analog input allowable dc offset allowable jitter width v dd v ain v ih v il f c f s d c t ir t if t xs t ws t ds t dh r dl v off t sx t rs t sr condition connect ainC and gsx xsync, rsync, bclk, pcmin, pdn, alaw bclk xsync, rsync bclk xsync, rsync, bclk, pcmin, pdn, alaw bclk ? xsync, see timing diagram xsync, rsync pull-up resistor transmit gain stage, gain = 10 xsync ? bclk, see timing diagram bclk ? rsync, see timing diagram rsync ? bclk, see timing diagram transmit gain stage, gain= 1 xsync, rsync, bclk min. typ. max. unit 4.75 2.2 0 64, 128, 256, 512, 1024, 2048, 96, 192, 384, 768, 1536, 1544, 200 6.0 40 100 1 bclk 100 100 0.5 C10 100 100 100 C100 5 8.0 50 5.25 2.4 v dd 0.8 9.0 60 50 50 100 +10 +100 1 100 v v pp v v khz % ns ns ns m s ns ns k w mv ns ns ns mv m s pf khz c dl voltage must be fixed operating temperature ta +25 c C30 +85
? semiconductor msm7578h/7578v/7579 9/18 electrical characteristics dc and digital interface characteristics parameter power supply current input high voltage input low voltage high level input leakage current low level input leakage current digital output low voltage digital output leakage current input capacitance symbol i dd1 i dd2 i dd3 v ih v il i ih i il v ol i o condition operating mode, no signal power-save mode, pdn = 1, xsync ? off pull-up resistance > 500 w min. 2.2 0.0 0.0 typ. 5 0.01 1.2 0.2 max. 9 0.05 3.0 v dd 0.8 2.0 0.5 0.4 10 unit ma ma v v m a m a v m a power-down mode, pdn = 0 c in 5pf (v dd = +5 v 5%, ta = C30c to +85c) ma analog input resistance r in ain+, ainC 10 m w transmit analog interface characteristics input resistance output load resistance output load capacitance output amplitude offset voltage r inx r lgx c lgx v ogx v osgx ain+, ainC gain = 1 10 20 C1.2 C20 30 +1.2 +20 m w k w pf v mv gsx with respect to sg parameter symbol condition min. typ. max. unit (v dd = +5 v to 5%, ta = C30c to +85c) receive analog interface characteristics output load resistance output load capacitance r lao c lao 0.6 50 k w pf output amplitude offset voltage v oao v osao C1.2 C100 +1.2 +100 v mv aout with respect to sg aout with respect to sg aout with respect to sg aout with respect to sg parameter symbol condition min. typ. max. unit (v dd = +5 v to 5%, ta = C30c to +85c)
? semiconductor msm7578h/7578v/7579 10/18 ac characteristics condition (v dd = +5 v 5%, ta = C30c to +85c) parameter symbol min. typ. max. unit transmit frequency response loss t1 level (dbm0) 60 20 26 db freq. (hz) loss t2 300 C0.15 +0.07 +0.20 db loss t3 1020 reference db 0 loss t4 2020 C0.15 C0.04 +0.20 db loss t5 3000 C0.15 +0.06 +0.20 db loss t6 3400 0 0.4 0.80 db receive frequency response loss r1 300 C0.15 C0.03 +0.20 db loss r2 1020 reference db loss r3 2020 C0.15 C0.02 +0.20 db 0 loss r4 3000 C0.15 +0.15 +0.20 db loss r5 3400 0.0 0.4 0.80 db sd t1 35 43 3 sd t2 35 41 0 sd t3 35 38 C30 transmit signal to distortion ratio 1020 db sd t4 29 31 C40 sd t5 24 27 C45 sd r1 36 43 3 sd r2 36 41 0 sd r3 36 40 C30 receive signal to distortion ratio 1020 db sd r4 30 33.5 C40 sd r5 25 30 C45 transmit gain tracking gt t1 C0.3 +0.01 +0.3 gt t2 reference gt t3 1020 C0.3 0 +0.3 db C40 gt t4 C0.6 C0.13 +0.6 gt t5 C1.2 C0.15 +1.2 3 C10 C50 C55 receive gain tracking gt r1 C0.3 0 +0.3 gt r2 reference gt r3 1020 C0.3 +0.10 +0.3 db gt r4 C0.6 +0.20 +0.6 gt r5 C1.2 +0.25 +1.2 C40 3 C10 C50 C55 *2 *2 *2 *2 *1 *1 30 26 29 32 24 27 *1 psophometric filter is used *2 upper is specified for the msm7578h, lower for the msm7579
? semiconductor msm7578h/7578v/7579 11/18 ac characteristics (continued) absolute level (initial difference) nidle t C72.5 C70.5 C70 C68 dbmop nidle r C78 av t 0.5803 0.6007 0.6218 av r 0.5803 0.6007 0.6218 vrms 1020 absolute delay av tt C0.2 +0.2 0 av rt C0.2 +0.2 td 1020 0.60 ms 0 a to a bclk = 64 khz transmit group delay tgd t1 0.19 0.75 tgd t2 0.11 0.35 tgd t3 0.02 0.125 0 tgd t4 0.05 0.125 ms *4 0.07 tgd t5 0.75 receive group delay 0.00 0.75 0.00 0.00 0.125 ms 0 0.09 0.125 0.12 0.75 C75 idle channel noise ain = sg *1 *3 *1 *2 db db v dd = 5.0 v ta = 25c v dd = +5 v 5% ta = C30 to 85c absolute level (deviation of temperature and power) 500 600 1000 2600 2800 crosstalk attenuation cr t 7585 cr r 80 1020 db 0 trans ? recv recv ? trans tgd r1 tgd r2 tgd r3 tgd r4 tgd r5 500 600 1000 2600 2800 *4 70 0.35 condition (v dd = +5 v 5%, ta = C30c to +85c) parameter symbol min. typ. max. unit level (dbm0) freq. (hz) *1 psophometric filter is used *2 upper is specified for the msm7578h, lower for the msm7579 *3 msm7578h: all "1", msm7579: "11010101" *4 minimum value of the group delay distortion
? semiconductor msm7578h/7578v/7579 12/18 ac characteristics (continued) dis 4.6 khz to 30 32 db digital output delay time t sd 20 200 t xd1 20 200 t xd2 20 200 t xd3 20 200 ns discrimination 0 0 to 4000 hz c l = 100 pf s 300 to C37.5 C35 dbmo out-of-band spurious 0 4.6 khz to imd fa = 470 C52 C35 dbmo intermodulation distortion C4 2fa C fb psr t 0 to 30db power supply noise rejection ratio 50 mv pp *5 psr r 72 khz 3400 fb = 320 50 khz 100 khz condition (v dd = +5 v 5%, ta = C30c to +85c) parameter symbol min. typ. max. unit level (dbm0) freq. (hz) *5 the measurement under idle channel noise
? semiconductor msm7578h/7578v/7579 13/18 timing diagram pcm data input/output timing bclk 12345678910 xsync pcmout d2 d3 d4 d5 d6 d7 d8 msd t xs t sx t ws t sd t xd1 t xd2 t xd3 bclk 12345678910 rsync pcmin d2 d3 d4 d5 d6 d7 msd t rs t sr t ws t ds t dh d8 transmit timing receive timing 11 when t xs 1/2 ? fc, the delay of the msd bit is defined as t xd1 . when t sx 1/2 ? fc, the delay of the msd bit is defined as t sd . 11
? semiconductor msm7578h/7578v/7579 14/18 application circuit pcmout ainC gsx analog input aout 10 m f pcm signal output pcm data input pcm shift clock input 8 khz sync signal input power down control input 0.1 m f 1 k w "1" = operation "0" = power down msm7578h/7579 0 to 10 w ain+ pcmin bclk analog output 5 v xsync pdn sgc ag dg v dd 0 v +5 v sg rsync 1 m f + C analog interface digital interface the analog output signal has an amplitude of 1.2 v above and below the offset voltage level of v dd /2.
? semiconductor msm7578h/7578v/7579 15/18 recommendations for actual design ? to assure proper electrical characteristics, use bypass capacitors with excellent high frequency characteristics for the power supply and keep them as close as possible to the device pins. ? connect the ag pin and the dg pin each other as close as possible. connect to the system ground with low impedance. ? mount the device directly on the board when mounted on pcbs. do not use ic sockets. if an ic socket is unavoidable, use the short lead type socket. ? when mounted on a frame, use electro-magnetic shielding, if any electro-magnetic wave source such as power supply transformers surround the device. ? keep the voltage on the v dd pin not lower than C0.3 v even instantaneously to avoid latch- up phenomenon when turning the power on. ? use a low noise (particularly, low level type of high frequency spike noise or pulse noise) power supply to avoid erroneous operation and the degradation of the characteristics of these devices.
? semiconductor msm7578h/7578v/7579 16/18 (unit : mm) package dimensions dip16-p-300-2.54 package material lead frame material pin treatment solder plate thickness package weight (g) epoxy resin 42 alloy solder plating 5 m m or more 0.99 typ.
? semiconductor msm7578h/7578v/7579 17/18 (unit : mm) 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). sop24-p-430-1.27-k package material lead frame material pin treatment solder plate thickness package weight (g) epoxy resin 42 alloy solder plating 5 m m or more 0.58 typ. mirror finish
? semiconductor msm7578h/7578v/7579 18/18 (unit : mm) 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). ssop20-p-250-0.95-k package material lead frame material pin treatment solder plate thickness package weight (g) epoxy resin 42 alloy solder plating 5 m m or more 0.18 typ. mirror finish

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