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| Preliminary PT2347 Stereo Audio Processor DESCRIPTION The PT2347 is an audio processor designed for versatile application, it adopts all of functions from successful predecessor- the PT2313L, and it includes 3 stereo input selector with adjustable gain, master volume control with low frequency loudness compensation, individual output attenuator and tone control. In car audio applications, maximum power output of the audio set is measurement on saturated condition, it may not achieve the goal if power amplifier does not have enough gain, therefore, the PT2347 provides extra +10dB voltage gain in final output stage, it is easy to drive the power amplifier into saturated power and eliminates external gain OPAMP. FEATURES * Controlled by IC interface * Direct replace the PT2313L with +10dB output gain * 3 stereo inputs with gain selection, range from 0dB to +11.25dB in 3.75dB/step * Master volume from 0dB to -78.75dB in 1.25dB/step * Speaker attenuator for balance and fader, range from 0dB to -38.75dB in 1.25dB/step * Each 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 = 4V to 10V) * Low harmonic distortion Low noise APPLICATIONS * Car audio * Home audio system * Powered speaker system BLOCK DIAGRAM Speaker Attenuator With Mute LROUT RROUT +10dB GAIN LFOUT REF REF +10dB GAIN RFOUT REF TREB_L BIN_L BOUT_L BASS TREBLE REF TREBLE TREB_R Master Volume REF BIN_R BASS BOUT_R Loud SW REF LOUDNESS LOUD_R LOUD_L LOUDNESS LIN LOUT LIN1 LIN2 LIN3 RIN ROUT Input SW and GAIN Input SW and GAIN RIN1 RIN2 RIN3 REF VDD I2C DECODER REF SCL SDA DGND REF REF BIAS AGND Tel: 886-66296288Fax: 886-29174598 http://www.princeton.com.tw2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT2347 APPLICATION CIRCUIT DIAGRAM PT2347 22uF 1 REF SCL 28 SDA 27 DGND 26 LFOUT 25 RFOUT 24 LROUT 23 RROUT 22 BOUT_R 21 BIN_R 20 BOUT_L 19 BIN_L 18 LOUT 17 LIN 16 LIN1 15 10uF 10uF 10uF 10uF 100n 100n 100n 100n 2.2uF 5.6K Rear Right Front Right Front Left VDD 2 VDD 3 AGND 4 27n 27n 5 6 7 TREB_L TREB_R RIN ROUT Input Surge P rotection L A UDIO 3 R L A UDIO 2 R L A UDIO 1 R 2.2K 2.2K 2.2K 2.2K 2.2K 2.2K 2.2uF 2.2uF 8 LOUD_R 100n 9 RIN3 2.2uF 2.2uF 2.2uF 100n 2.2uF 2.2uF 5.6K Rear Left 10 RIN2 11 RIN1 12 LOUD_L 13 LIN3 14 LIN2 P ower A mplifier PRE1.0 2 PT2347 ORDER INFORMATION Valid Part Number PT2347-S Package Type 28 Pins, SOP, 300mil Top Code PT2347-S PIN CONFIGURATION PIN DESCRIPTION Pin Name REF VDD AGND TREB_L TREB_R RIN ROUT LOUD_R RIN3 RIN2 RIN1 LOUD_L LIN3 LIN2 LIN1 LIN LOUT BIN_L BOUT_L BIN_R BOUT_R RROUT LROUT RFOUT LFOUT DGND SDA SCL PRE1.0 I/O I I I O I I I I I I I I I O I O I O O O O O I I Description Analog reference voltage (1/2VDD) Supply input voltage Analog ground Left channel input for treble controller Right channel input for treble controller Right channel volume controller input Right channel Input selector output Right channel loudness input Right channel input 3 Right channel input 2 Right channel input 1 Left channel loudness input Left channel input 3 Left channel input 2 Left channel input 1 Left channel volume controller input Left channel Input selector output Left channel input for bass controller Left channel output for bass controller Right channel input for bass controller Right channel output for bass controller Right rear speaker output Left rear speaker output Right front speaker output Left front speaker output Digital ground I2C data input I2C clock input 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 3 |
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