PT12311 Stereo Audio Processor for Car Audio DESCRIPTION FEATURES 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. • 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 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 car audio systems. APPLICATIONS • Car Audio • Home Audio System • Powered Speaker System APPLICATION CIRCUIT PT12311 22uF VDD 2.7n 2.7n Input Surge Protection L AUDIO 3 R L AUDIO 2 R L AUDIO 1 R 2.2uF 2.2K 2.2uF 2.2K 2.2uF 2.2K 100n 2.2uF 2.2K 2.2uF 2.2K 2.2uF SCL 28 2 VDD SDA 27 3 AGND DGND 26 4 TREB_L LFOUT 25 5 TREB_R RFOUT 24 6 RIN LROUT 23 7 ROUT RROUT 22 8 LOUD_R 9 RIN3 BOUT_R 21 MCU 10uF Front Left 10uF 10uF Front Right 10uF 100n BIN_R 20 5.6K 100n 2.2uF 2.2K 1 REF 10 RIN2 BOUT_L 19 11 RIN1 BIN_L 18 12 LOUD_L LOUT 17 100n 100n 100n 2.2uF 13 LIN3 LIN 16 14 LIN2 LIN1 15 Rear Left 5.6K Rear Right Power Amplifier Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT12311 BLOCK DIAGRAM Speaker Attenuator With Mute RROUT LROUT REF REF RFOUT LFOUT REF TREB_L REF TREBLE TREB_R TREBLE BIN_L BIN_R BASS BOUT_L REF LOUD_L BASS Master Volume LOUDNESS Loud SW BOUT_R REF LOUD_R LOUDNESS RIN LIN LOUT ROUT Input SW and GAIN LIN1 Input SW and GAIN RIN1 LIN2 RIN2 LIN3 RIN3 REF REF VDD SCL INT Ref REF REF BIAS I2C DECODER SDA DGND AGND V1.1 2 January 2010 PT12311 ORDER INFORMATION Valid Part Number PT12311-S Package Type 28 Pins, SOP, 300mil Top Code PT12311 PIN CONFIGURATION REF 1 28 SCL VDD 2 27 SDA AGND 3 26 DGND TREB_L 4 25 LFOUT TREB_R 5 24 RFOUT RIN 6 23 LROUT ROUT 7 LOUD_R 8 RIN3 22 RROUT PT12311 9 20 BIN_R RIN2 10 19 BOUT_L RIN1 11 18 BIN_L LOUD_L 12 V1.1 21 BOUT_R 17 LOUT LIN3 13 16 LIN LIN2 14 15 LIN1 3 January 2010 PT12311 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 16 January 2010