PT12919 3 Band Car Audio Processor DESCRIPTION The PT12919 is a 3 band audio signal processor specially designed for car radio applications. The device includes a high performance audio processor with fully integrated audio filters. The digital control allows programming in a wide range of filter characteristics. APPLICATION • Car Audio System FEATURES • 4 stereo inputs (including 1 quasi-differential input) with selectable input gain • Input Gain Control: 0 to +15dB, 1dB/step • Car Audio System • 2 channels electronic volume with soft step function: +15 to -79dB with 1dB/step • Direct mute and soft mute • 1 subwoofer output with soft step: +15 to -79dB with 1dB/step • Adjustable crossover frequency for subwoofer • Tone control (Bass、Middle and Treble): -15 to +15dB, 1dB/step • Loudness: 0 to -15dB, 1dB/step • 4 independent speaker outputs with soft step volume: +15 to -79dB with 1dB/step & independent programmable mix input with 50% mixing ratio for front speakers • 7 band spectrum analyzer • Controlled by I2C BUS Interface • Low distortion and low noise • 28-pin SOP package BLOCK DIAGRAM Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT12919 APPLICATION CIRCUIT V1.1 2 May, 2012 PT12919 ORDER INFORMATION Part Number Package Type Top Code PT12919-S 28 Pins, SOP, 300mil PT12919-S PIN CONFIGURATION V1.1 ACOUTR/AC2OUTR 1 28 MIX/OUTSW/OUTRR2 ACINR/FILOR 2 27 VREF ACINL/FILOL 3 26 SAOUT ACOUTL/AC2OUTL 4 25 SAIN SE3L/AC2INL 5 24 VDD SE3R/AC2INR 6 23 SDA SE2L 7 22 SCL SE2R 8 21 MUTE SE1L 9 20 OUTLF SE1R 10 19 OUTLR DIFFL 11 18 OUTRR DIFFG 12 17 OUTRF DIFFR 13 16 OUTSW/OUTLR2 CREF 14 15 GND PT12919 3 May, 2012 PT12919 PIN DESCRIPTION Pin Name ACOUTR/AC2OUTR ACINR/FILOR ACINL/FILOL ACOUTL/AC2OUTL SE3L/ACINL SE3R/ACINR SE2L SE2R SE1L SE1R DIFFL DIFFG DIFFR CREF GND OUTSW/OUTLR2 OUTRF OUTRR OUTLR OUTLF MUTE SCL SDA VDD SAIN SAOUT VREF MIX/OUTSW/OUTRR2 V1.1 I/O O I/O I/O O I I I I I I I I I O S O O O O O I I I/O S I O O I/O Description AC coupling right output/HPF filter AC2OUT right channel AC coupling right input/HPF filter FILO right channel AC coupling left input/HPF filter FILO left channel AC coupling left output/HPF filter AC2OUT left channel Single-ended input 3 left channel/AC coupling left input Single-ended input 3 right channel/AC coupling right input Single-ended input 2 left channel Single-ended input 2 right channel Single-ended input 1 left channel Single-ended input 1 right channel Quasi-Differential stereo input left Quasi-Differential stereo input common Quasi-Differential stereo input right Reference capacitor Ground Subwoofer output/2nd rear left output Front right output Rear right output Rear left output Front left output External mute pin I2C bus clock I2C bus data Supply Spectrum Analyzer clock input Spectrum Analyzer output Vref output Mix input/Additional subwoofer output/2nd rear right output 4 Pin No. 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 May, 2012 PT12919 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 V1.1 29 May, 2012