preliminary PT12311 stereo audio processor for car audio tel: 886-66296288 ? fax: 886-29174598 ? http://www.princeton.com.tw ? 2f, 233-1, baociao road, si ndian, 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 the cost-effective ca r audio systems. applications ? car audio ? home audio system ? powered speaker system features ? 3 stereo inputs with gain selection, range from 0db to +11.25db in 3.75db/step ? master volume from 0 db to -78.75db in 1.25db/step ? speaker attenuator 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) ? low harmonic distortion, low noise 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 tre b_ l tre b_ 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 2.2uf 2.2uf 22uf vdd 27n 27n 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 audio 1 audio 2 audio 3 2.2k 2.2k 2.2k 2.2k 2.2k 2.2k l l l r r r input surge protection mcu PT12311
PT12311 pre1.0 2 september, 2009 block diagram lout lin1 lin2 lin3 ref loudness lin loud_l ref bout_l bin_l treb_l treble bass lfout lrout ref ref ref ref loudness ref treble bass rrout rfout treb_r bout_r loud_r rin rin3 rin2 rin1 rout ref vdd ref agnd ref sc l sda dgnd i2c decoder bias bin_r speaker attenuator with mute master volume input sw and g ain input sw and g ain int r e f loud s w
PT12311 pre1.0 3 september, 2009 order information valid part number package type top code PT12311-s 28 pins, sop, 300mil PT12311 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 rrou t lrout rfou t lfout dgnd sda scl PT12311
PT12311 pre1.0 4 september, 2009 pin description pin name i/o description pin no. ref - analog reference voltage (1/2vdd) 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 right channel volume controller input 6 rout o right channel input 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 left channel input selector output 17 bin_l i left channel input for bass controller 18 bout_l o left channel output for bass controller 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
PT12311 pre1.0 5 september, 2009 important notice princeton technology corporation (ptc ) reserves the right to make co rrections, 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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