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| Preliminary 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 processor, it equipped up to 4 stereo sources input with adjustable gain, master volume with adaptive loudness, treble and bass tone control. In a car entertainment system needs front and rear seat individual control, the PT2348 provides separate input source selection and output volume adjust ; a special design mixing amp is very easy combine the navigation system or cellular phone's voice into the car audio system. FEATURES * Controlled by IC 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 APPLICATION * Car Audio BLOCK DIAGRAM Tel: 886-66296288Fax: 886-29174598 http://www.princeton.com.tw2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT2348 APPLICATION CIRCUIT SE3R SE2R SE1R SE1L SE2L SE3L DIFFL DIFFG DIFFR 2.2uF 2.2uF 2.2uF 2.2uF 2.2uF 2.2uF 2.2uF 2.2uF 2.2uF 2.2uF 1 2 3 4 5 6 7 8 9 10 11 12 SE3R SE2R SE1R SE1L SE2L SE3L DIFFL DIFFG DIFFR SCL SDA GND CREF VDD MIX/OUTSW OUTLF OUTLR OUTRR 36 MCU 35 34 33 32 31 30 29 28 27 26 25 24 23 10uF VDD MIX IN / SWOUT 4.7uF 4.7uF 4.7uF 4.7uF 4.7uF 4.7uF 68n 27n 2.2uF OUTLF OUTLR OUTRR OUTRF SWOUT PT2348 IGL VOL LDL IGR VOR LDR BL1 BL2 TRL OUTRF OUTSW C1P C2 SIN 47nF 2.2uF 13 14 15 SOUT 22 BR1 BR2 TRR 21 20 19 47nF 4.7K 100n 100n 8.2n 16 17 18 100n 100n 8.2n 4.7K PRE1.0 2 July, 2009 PT2348 ORDER INFORMATION Valid Part Number PT2348-X Package Type 36 Pins, SSOP, 300mil Top Code PT2348-X PIN CONFIGURATION PRE1.0 3 July, 2009 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 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 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 PRE1.0 4 July, 2009 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 PRE1.0 5 July, 2009 |
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