PT2348 4.1-Channel Audio Processor with Subwoofer DESCRIPTION The PT2348 is a 4.1CH audio processor designed for Car Audio purpose. Using I2C interface controls all of the functions. Like most of audio processors, it equips up to 4 stereo sources input with adjustable gain, master volume with adaptive loudness, treble and bass tone control. In a car entertainment system where needs front and rear seat individual control, the PT2348 provides separate input source selection and output volume adjustment; a special design, mixing amp, is very easy to combine the navigation system or cellular phone’s voice with the car audio system. APPLICATION • Car Audio FEATURES • Controlled by I2C Interface • 4 Stereo Inputs (including 1 quasi-differential input) with selectable input gain • 2 Channels Electronic Volume： +15 to -79dB with 1dB/step • 1 Subwoofer Output: +15 to -79dB with 1dB/step • Adjustable crossover frequency for Subwoofer • Tone Control (Bass and Treble): -15 to +15dB, 1dB/step • Input Gain Control: 0 to +15dB, 1dB/step • Loudness: 0 to -15dB, 1dB/step • 4 independent speaker outputs: +15 to -79dB with 1dB/step & independent programmable mix input with 50% mixing ratio for front speakers • Low Distortion and Low Noise • 36-pin SSOP package BLOCK DIAGRAM Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT2348 APPLICATION CIRCUIT SE3R 2.2uF SE2R 2.2uF SE1R 2.2uF SE1L 2.2uF SE2L 2.2uF SE3L 2.2uF DIFFL 2.2uF DIFFG 2.2uF DIFFR 2.2uF SE3R SCL 36 2 SE2R SDA 35 3 SE1R GND 34 4 SE1L CREF 33 5 SE2L VDD 32 6 SE3L MIX/OUTSW 31 MCU 10uF 7 8 9 10 11 47nF 2.2uF 47nF 4.7K 100n 100n DIFFL OUTLF DIFFG OUTLR DIFFR IGL VOL OUTRR PT2348 2.2uF 1 OUTRF OUTSW 29 28 27 26 12 LDL C1P 25 13 IGR C2 24 14 VOR SIN 23 15 LDR 16 BL1 BR1 21 17 BL2 BR2 20 18 MIX IN / SWOUT 4.7uF OUTLF 4.7uF OUTLR 4.7uF OUTRR 4.7uF OUTRF 4.7uF SWOUT 4.7uF 68n 27n 2.2uF SOUT 22 TRL TRR 8.2n V1.0 30 VDD 19 100n 4.7K 100n 8.2n 2 February 2010 PT2348 ORDER INFORMATION Valid Part Number PT2348-X Package Type 36 Pins, SSOP, 300mil Top Code PT2348-X PIN CONFIGURATION V1.0 3 February 2010 PT2348 PIN DESCRIPTION Pin Name SE3R SE2R SE1R SE1L SE2L SE3L DIFFL DIFFG DIFFR IGL VOL LDL IGR VOR LDR BL1 BL2 TRL TRR BR2 BR1 SOUT SIN C2 C1P OUTSW OUTRF OUTRR OUTLR OUTLF MIX/OUTSW VDD CREF GND SDA SCL V1.0 I/O I I I I I I I I I O I I O I I I O I I O I O I I I O O O O O I/O I I I Description Single-ended Right Channel Input 3 Single-ended Right Channel Input 2 Single-ended Right Channel Input 1 Single-ended Left Channel Input 1 Single-ended Left Channel Input 2 Single-ended Left Channel Input 3 Pseudo Differential Stereo Input Left Pseudo Differential Stereo Input Common Pseudo Differential Stereo Input Right Left Channel Input Selector Output Left Channel Volume Input Left Channel Loudness Input Right Channel Input Selector Output Right Channel Volume Input Right Channel Loudness Input Left Channel Bass Cap 1 Left Channel Bass Cap 2 Left Channel Treble Cap Right Channel Treble Cap Right Channel Bass Cap 2 Right Channel Bass Cap 1 R + L Output (-6db Gain) Subwoofer Filter Input Subwoofer Filter Cap 2 Subwoofer Filter Cap 1 Subwoofer Output Right Front Output Right Rear Output Left Rear Output Left Front Output Mix input / Subwoofer output Supply Voltage Analog Reference Voltage (1/2 VDD) Ground SDA INPUT SCL INPUT 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 29 30 31 32 33 34 35 36 February 2010 PT2348 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 V1.0 5 February 2010