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tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 1 - december, 2006 electronic volume controller ic pt2257 description pt2257 is an electronic volume controller ic utilizing cmos technology specially designed for the new generation of av entertain ment products. it has two (2) built-in channels making it ideally suitable for mono and stereo sound applications. pt2257 provides an i 2 c control interface, an attenuation range of 0 to -79db, low noise, and high channel separ ation. it is housed in an 8 pins, dip or sop package, pt2257?s pin assignments and application circui t are optimized for easy pcb layout and cost saving advantages. features ? cmos technology ? low power consumption ? least external components ? attenuation range: 0 to -79db at 1db/step ? operating voltage: 4 to 9v ? low noise, s/n ratio>100db (a-weighting) ? two channel output ? available in 8 pins, dip or sop applications ? av surround audio equipment ? car audio ? mini compo ? computer multi-media speaker ? other audio equipment
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 2 - december, 2006 electronic volume controller ic pt2257 block diagram l in l out v dd r in sd a sc l vss 10db /step 10db /step 1db /ste p 1db /ste p ref control unit r ou t + - + + - -
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 3 - december, 2006 electronic volume controller ic pt2257 pin configuration pt2257 lin lout vss sda rin rout vdd scl pin description pin name i/o description pin no. l in i left input channel connect a capacitor to audio source 1 l out o left output channel connect a capacitor to audio output 2 v ss - ground 3 sda i i 2 c data input 4 scl i i 2 c clock input 5 v dd - power supply 6 r out o right output channel connect a capacitor to audio output 7 r in i right input channel connect a capacitor to audio source 8
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 4 - december, 2006 electronic volume controller ic pt2257 function description bus interface data are transmitted to and from the microproce ssor to the pt2257 via the sda and scl. the sda and scl make up the bus interface. it should be noted t hat the pull-up resistors must be connected to the positive supply voltage. data validity a data on the sda line is considered valid and stable onl y when the scl signal is in high state. the high and low states of the sda line can only change when the scl signal is low. please refer to the figure below. data clk data line stable, datavalid data change a llowed start and stop conditions a start condition is activated when 1. the scl is set to high and 2. sda shifts from high to low state. the stop condition is activated when 1. scl is set to high and 2. sda shifts from low to high state. please refer to the timing diagram below. data clk start stop
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 5 - december, 2006 electronic volume controller ic pt2257 byte format every byte transmitted to the sda line consists of 8 bits. each byte must be followed by an acknowledge bit. the msb is transmitted first. acknowledge during the acknowledge clock pulse, the master (p) puts a resistive high level on the sda line. the peripheral (audio processor) that acknowledges has to pull-down (low) the sda line during the acknowledge clock pulse so that the sda line is in a stable low state during this clock pulse. please refer to the diagram below. sda scl start msb acknowledgment from receive r 12 3789 4 the audio processor that has been addressed has to generate an acknowledge after receiving each byte; otherwise, the sda line will remain at the high level during the ninth (9th) clock pulse. in this case, the master transmitter can generate the stop information in order to abort the transfer. transmission without acknowledge if you want to avoid the acknowledge detection of the audio processor, a simpler p transmission may be used. wait one clock and do not c heck the slave acknowledge of this same clock then send the new data. if you use this approach, there are greater c hances of faulty operation as well as decrease in noise immunity.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 6 - december, 2006 electronic volume controller ic pt2257 interface protocol the interface protocol consists of the following: ? a start bit ? a chip address byte=88h ? ack=acknowledge bit ? a data byte ? a stop bit please refer to the diagram below: pt2257 address msb first byte lsb msb lsb msb lsb start 1 0 0 0 1 0 0 0 ack data ack data ack stop data transmitted (n -bytes+acknowledge) note: 1. ack=acknowledge 2. max. clock speed=100k bits/s
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 7 - december, 2006 electronic volume controller ic pt2257 software specification pt2257 address pt2257 address is shown below: 1 msb 0 0 0 1 0 0 0 lsb i 2 c bus interface start time after power is turned on, pt2257 needs to wait for a shor t time in order to insure stability. the waiting time period for pt2257 to send i 2 c bus signal is at least 200ms. if t he waiting time period is less than 200ms, i 2 c control may fail. please refer to the diagram below. power on vdd sda/scl v 90% vdd at least 200ms
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 8 - december, 2006 electronic volume controller ic pt2257 data bytes description function bits msb 2 3 4 5 6 7 lsb function 1 1 1 1 1 1 1 1 function off (-79db) 1 1 0 1 a3 a2 a1 a0 2-channel, -1db/step 1 1 1 0 0 b2 b1 b0 2-channel, -10db/step 1 0 1 0 a3 a2 a1 a0 left channel, -1db/step 1 0 1 1 0 b2 b1 b0 left channel, -10db/step 0 0 1 0 a3 a2 a1 a0 right channel, -1db/step 0 0 1 1 0 b2 b1 b0 right channel, -10db/step 0 1 1 1 1 0 0 m 2-channel, mute when m=1, mute=on when m=0, mute=off attenuation unit bit a3 a2/b2 a1/b1 a0/b0 attenuation value (db) 0 0 0 0 0/0 0 0 0 1 -1/-10 0 0 1 0 -2/-20 0 0 1 1 -3/-30 0 1 0 0 -4/-40 0 1 0 1 -5/-50 0 1 1 0 -6/-60 0 1 1 1 -7/-70 1 0 0 0 -8/ 1 0 0 1 -9/ where: ax=-db/step, bx=-10db/step for example, for a left channel attenuation at -33db, the data byte is as follows: start 1 0 1 1 0 0 1 1 ack 1 0 1 0 0 0 1 1 ack stop left channel -30db left channel -3db
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 9 - december, 2006 electronic volume controller ic pt2257 absolute maximum rating parameter symbol rating unit supply voltage v cc 12 v operating temperature topr -40 to +85 storage temperature tstg -65 to +150 input voltage v i -0.3 to v cc +0.3 v audio section electrical characteristics parameter symbol condition min. typ. max. unit operating voltage v cc 4 9 10 v operating current i cc v cc =9v, v i =0v - 9 15 ma minimum attenuation - 0 - volume attenuation range arange maximum attenuation - -79 - db attenuation step astep - 1 - db attenuation step gain error gerr - 0.5 - db interchannel attenuation gain error cerr - 0.5 - db maximum output voltage vomax v cc =9v, f=1khz volume att=0db rload=50k, thd<1% 2.0 2.3 2.5 vrms vout=2vrms - 0.07 0.09 total harmonic distortion thd f=1khz, volume att=0db, a-weighted rload=50k vout=200m vrms - 0.003 0.005 % noise output no vin=gnd, mute=off volume att=0db a-weighted - 2 3 vrms no-weighted 95 100 103 signal-to-noise ratio snr 0db=1vrms, att=0db, a-weighted a-weighted 110 120 125 db channel separation cs vin=2.5vrms, f=1khz volume att=0db 100 120 125 db mute attenuation mute vin=2.5vrms, f=1khz volume att=0db, a-weighted 90 95 97 db frequency response fr vin=1vrms, volume att=-10db - 1 1.3 mhz input impedance rin f=1khz 18 20 - k ? output impedance rout f=1khz, vout=100m vrms - 100 - ?
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 10 - december, 2006 electronic volume controller ic pt2257 i 2 c bus section electrical characteristics parameter symbol condition min. typ. max. unit bus high input level vih 0.5 vcc bus low input level vil 0.2 vcc bus line timing characteristics parameter symbol condition min. max. unit low level input voltage v il vdd=4.0v -0.5 1.1 v high level input voltage v ih vdd=4.0v 1.6 4.0 v scl clock frequency f scl 0 100 khz time the bus must be free before a new transmission can start t buf 5.0 - s hold time start condition* t hd-sta 4.0 - s clock low period t low 5.0 - s clock high period t high 4.0 - s setup time for start condition ** t su-sta 5.0 - s data hold time t hd-dat 0 - s data setup time t su-dat 250 - ns rise time (sda & scl lines) t r - 1000 ns fall time (sda & scl lines) t f - 300 ns stop condition setup time t su-sto 4.0 - s notes: 1. * = the first clock pulse is generated after this period. 2. ** = this is only relevant for a repeated start condition.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 11 - december, 2006 electronic volume controller ic pt2257 pt2257 thd - fast fourier transform (fft) analysis 1 (conditions: rload=10k, volume att=0db , vcc=9v, output level=1vrms) -160 +0 -140 -120 -100 -80 -60 -40 -20 20 10k 50 100 200 500 1k 2k 5k hz pt2257 thd - fast fourier transform (fft) analysis 2 (conditions: rload=10k, volume att=0db, vcc=9v, output level=200m vrms) -160 +0 -140 -120 -100 -80 -60 -40 -20 20 10k 50 100 200 500 1k 2k 5k hz db db
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 12 - december, 2006 electronic volume controller ic pt2257 pt2257 noise floor-fast fourier transform (fft) analysis 3 (conditions: rload=10k, volume att=0db, vcc=9v, vin=gnd) -160 +0 -140 -120 -100 -80 -60 -40 -20 20 10k 50 100 200 500 1k 2k 5k hz pt2257 thd vs. output level (conditions: rload=10k, volume att=0db , vcc=9v, f=1khz, a-weighted) 0.001 20 0.01 0.1 1 5 1m 4 2m 5m 10m 20m 50m 100m 200m 500m 1 2 vrms db %
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 13 - december, 2006 electronic volume controller ic pt2257 pt2257 thd vs frequency response at various output levels (conditions: rload=10k, volume att=0db, no-weighted) vout=2.5 vrms 0.001 1 0.01 0.1 20 20k 50 100 200 500 1k 2k 5k 10k hz note: from top to bottom: vout=2.5vrms, 1vrms, 200mvrms pt2257 interchannel crosstalk (conditions: rload=10k, volume att=0db) -150 +0 -100 -50 20 20k 50 100 200 500 1k 2k 5k 10k hz % vout=1vrms vout=200m vrms db
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 14 - december, 2006 electronic volume controller ic pt2257 application circuit mcu out-l in-l 4v-9v dc ic bus 2 47 f 10 f in-r out-r 0.1 f pt2257 lin lout vss sda rin vdd scl rout 1 2 3 4 8 7 6 5 + + + + + 10 f 10 f
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 15 - december, 2006 electronic volume controller ic pt2257 order information valid part number package type top code pt2257 8 pins, dip, 300mil pt2257 pt2257-s 8 pins, sop, 150mil pt2257-s pt2257 (l) 8 pins, dip, 300mil pt2257 pt2257-s (l) 8 pins, sop, 150mil pt2257-s notes: 1. (l), (c) or (s) = lead free. 2. the lead free mark is put in front of the date code.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 16 - december, 2006 electronic volume controller ic pt2257 package information 8 pins, dip, 300mil
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 17 - december, 2006 electronic volume controller ic pt2257 symbol min. nom. max. a - - 0.210 a1 0.015 - - a2 0.115 0.130 0.195 b 0.014 0.018 0.022 b1 0.014 0.018 0.020 b2 0.045 0.060 0.070 b3 0.030 0.039 0.045 c 0.008 0.010 0.014 c1 0.008 0.010 0.011 d 0.355 0.365 0.400 d1 0.005 - - e 0.300 0.310 0.325 e1 0.240 0.250 0.280 e 0.100 bsc ea 0.300 bsc. eb - - 0.430 ec 0.000 - 0.060 l 0.115 0.130 0.150 notes: 1. controlling dimension: inches. 2. dimensioning and toleranci ng per ansi y14.5m-1982. 3. symbols are defined in the ?mo series symbol list? in section 2.2 of publication no.95. 4. dimensions a, a1 and l ar e measured with the package seated in jedec seating plane gauge gs-3. 5. d, d1 and e1 dimension do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch. 6. e and ea measured with the leads c onstrained to be perpendicular to data -c- . 7. eb and ec are measured at the lead tips with the leads unconstrained. 8. n is the number of leads (n=8). 9. pointed or rounded lead tips ar e preferred to ease insertion. 10. b2 and b3 maximum dimensions do not include dam bar protrusions. dambar protrusions shall not exceed 0.010 (0.25mm). 11. variation ba has a b3 dimension and is 1/2 lead package. 12. distance between the leads including dambar protrusions to be 0.005 inch minimum. 13. datum plane -h- coincident with the bo ttom of lead where lead exits the body. 14. refer to jedec ms-001 variation ba. jedec is the registered trademark of je dec solid state technology association.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 18 - december, 2006 electronic volume controller ic pt2257 8 pins, sop, 150mil
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 19 - december, 2006 electronic volume controller ic pt2257
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2257 v1.3 - 20 - december, 2006 electronic volume controller ic pt2257 symbol min. typ. max. a 1.35 - 1.75 a1 0.10 - 0.25 a2 1.25 - 1.65 b 0.31 - 0.51 b1 0.28 - 0.48 c 0.17 - 0.25 c1 0.17 - 0.23 d 4.90 bsc. e 6.00 bsc. e1 3.90 bsc. e 1.27 bsc. l 0.40 - 1.27 l1 1.04 ref. l2 0.25 bsc. r 0.07 - - r1 0.07 - h 0.25 - 0.50 0 - 8 1 5 - 15 2 0 - - notes: 1. dimensioning and toleranc ing per ansi y 14.5m-1994 2. controlling dimension: millimeters. 3. dimension d does not include mold flash protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.15 mm (0.006 in ) per end. dimension e1 does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25mm per side. d and e1 dimensions are determined at datum h. 4. the package top may be smaller than the package bottom. dimensions d and e1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 5. datums a & b to be determined at datum h. 6. n is the number of terminal positions. (n=8) 7. the dimensions apply to the flat section of the lead between 0.10 to 0.25mm from the lead tip. 8. dimension ?b? does not include dambar protru sion. allowable dambar protrusion shall be 0.10mm total in excess of the ?b? dimension at maximum material conditi on. the dambar cannot be located on the lower radius of the foot. 9. this chamfer feature is optional. if it is not present, then a pin 1 identif ier must be located within the index area indicated. 10. refer to jedec ms-012, variation aa. jedec is the registered trademark of je dec solid state technology association.

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