pt 1 231 1 stereo audio processor for car audio tel: 886 -66296288 ? fax: 886 -29174598 ? http://www.princeton.com.tw ? 2f, 233 - 1, baociao road, sindian, taipei 23145, taiwan description the PT12311 is an audio processor designed for versatile application, includes 3 stereo input selector with adjustable gain, master volume control with low frequency loudness compensation, individual output attenuator and tone control. it is a good solution for the car audio signal processing. due to the high reliability requirement from the car audio business , the PT12311 improves both audio performances and input surge current capability , these causes the PT12311 is the best solution for t he cost - effective car audio systems. applications ? car audio ? home audio system ? powered speaker system features ? 3 s tereo i nputs with g ain selection, range from 0 db to +11.25db in 3.75db / step ? master v olume from 0 db to - 78.75db in 1.25db /s tep ? speaker atten uator for balance and fader, range from 0db to - 38.75db in 1.25db/step ? each channel output can be muted individually. ? low frequency loudness compensation ? bass and treble control, range from - 14db to +14db in 2db/step ? wide operation range (vdd = 5v to 10v) ? l ow harmonic d istortion , l ow n oise application circuit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 ref vdd agnd treb_l treb_r ri n rout loud_r ri n3 ri n2 ri n1 loud_l li n3 li n2 li n1 lin lout bout_l bi n_l bi n_r bout_r rrout lrout rfout lfout dgnd sda scl 2.2uf 2.2uf 22uf vdd 2.7n 2.7n 100n 100n 100n 100n 100n 100n 5.6k 5.6k fr ont left fr ont ri g ht rear left rear ri g ht 10uf 10uf 10uf 10uf power amplifier 2.2uf 2.2uf 2.2uf 2.2uf 2.2uf 2.2uf audi o 1 audi o 2 audi o 3 2.2k 2.2k 2.2k 2.2k 2.2k 2.2k l l l r r r input surge protection mcu PT12311
pt 12311 v 1. 1 2 januar y 20 10 block diagram lout lin1 lin2 lin3 ref loudness lin loud_l ref bout_l bin_l treb_l treble bass lf out lrout ref ref ref ref loudness ref treble bass rrout rf out treb_r bout_r loud_r rin rin3 rin2 rin1 rout ref vdd ref agnd ref scl sda dgnd i2c decoder bias bin_r speake r attenuator with mute master volume input sw and gain input sw and gain int ref loud sw
pt 12311 v 1. 1 3 januar y 20 10 order information valid part number package type top code pt 1 231 1 - s 28 pins, sop, 300mil pt 12311 pin configuration 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 ref vdd agnd treb_l treb_r rin rout loud_r rin3 rin2 rin1 loud_l lin3 lin2 lin1 lin lout bout_l bin_l bin_r bout_r rrout lrout rfout lfout dgnd sda scl PT12311
pt 12311 v 1. 1 4 januar y 20 10 pin description pin name i/o description pi n no. ref - analog reference voltage (1/2 vdd ) 1 vdd - supply input voltage 2 agnd - analog ground 3 treb_l i left channel input for treble controller 4 treb_r i right channel input for treble controller 5 rin i r ight channel volume controller input 6 rout o right channel i nput selector output 7 loud_r i right channel loudness input 8 rin3 i right channel input 3 9 rin2 i right channel input 2 10 rin1 i right channel input 1 11 loud_l i left channel loudness input 12 lin3 i left channel input 3 13 lin2 i left channel input 2 14 lin1 i left channel input 1 15 lin i left channel volume controller input 16 lout o l eft channel i nput selector output 17 bin_l i left channel input for bass controller 18 bout_l o left channel output for bass contr oller 19 bin_r i right channel input for bass controller 20 bout_r o right channel output for bass controller 21 rrout o right rear speaker output 22 lrout o left rear speaker output 23 rfout o right front speaker output 24 lfout o left front speaker output 25 dgnd - digital ground 26 sda i i 2 c data input 27 scl i i 2 c clock input 28
pt 12311 v 1. 1 5 januar y 20 10 important notice princeton technology corporation (ptc) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. ptc cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a ptc product. no circuit patent licenses are implied. princeton technology corp. 2f, 233 - 1, baociao road, sindian, taipei 23145, taiwan tel: 886 - 2 - 66296288 fax: 886 - 2 - 29174598 http://www.princeton.com.tw
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