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| PT2037 Digitally Controlled Audio Processor DESCRIPTION The PT2037 is a multiple functions audio signal processor, very low distortion and low noise are obtained by the advanced CMOS fabricate technology. All of characteristics and functions are designed for the customer who needs high performance and better hearing experience. This device provides a lot of new features like soft-mute and zero-crossing mute to minimize the noises during the audio sources are switching. Further more, the device equipped differential audio inputs to improve the Common Mode Reject Ratio and it is very helpful to canceling ground loop hum noises in the car and audio dock system. FEATURES * Input multiplexer - 4 Stereo input - 1 Mono input - 1 Differential input - Selectable input gain for optimal adaptation to different sources * Multiple MUTE function - Software controlled: Direct Mute, Zero-Crossing Mute and Soft Mute - Hardware controlled: Soft Mute * Fully programmable loudness function * Volume control in 1dB steps including gain up to 16dB * 3 band (Bass, Middle and Treble ) tone control * Four independent speaker attenuators control in 1dB steps for balance and fader facilities * Programmable threshold for pause and zero cross mute detector * All functions programmable via serial I2C bus APPLICATIONS * Car audio * Audio dock system * Mini compo system BLOCK DIAGRAM MUXOUT_L 21 STEREO1_L STEREO2_L STEREO3_L STEREO4_L DIFF_L DIFFGND_L MONO STEREO1_R STEREO2_R STEREO3_R STEREO4_R DIFF_R DIFFGND_R DVDD AVDD 16 17 18 15 14 13 11 8 9 10 7 6 5 41 42 SUPPLY SPEAKER ATT MUTE CONTROL SOFT,ZERO 39 CREF 3 MUXOUT_R 2 IN_R 4 LOUD_R 1 TREB_R 23 MID_RO 22 MID_RI 27 BASS_RO 26 BASS_RI 28 SMEXT 35 PAUSE 19 CSM 32 OUT_RF INPUT MULTIPLEXER IN GAIN VOLUME +LOUDN 43 AGND IN GAIN VOLUME +LOUDN TREBLE MIDDLE BASS SOFT MUTE BASS_LO BASS_LI MID_LO LOUD_L TREB_L MID_LI IN_L 20 12 44 30 31 25 24 SPEAKER ATT SPEAKER ATT 34 OUT_LF 33 OUT_LR 40 38 I2C BUS DECODER +LATCHES 37 36 ADDR SCL SDA DGND TREBLE MIDDLE BASS SOFT MUTE SPEAKER ATT 29 OUT_RR Tel: 886-66296288Fax: 886-29174598 http://www.princeton.com.tw2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT2037 APPLICATION CIRCUIT POWER VDD GND 2 1 50 ADDR SEL 22uF 5.6nF 44 TREB_L TREB_R IN_R MUXOUT_R LOUD_R DIFFGND_R DIFF_R STEREO4_R STEREO1_R STEREO2_R MCU OUTPUTS OUT_LF 4.7uF 35 PAUSE 34 OUT_LF 22uF 10uF 100n 43 AGND 42 AVDD 41 DVDD 40 ADDR 39 CREF 38 SCL 37 SDA 36 DGND 1 5.6nF 2 3 4 47nF DIFFG_R 4.7uF DIFF_R 4.7uF ST4_R 470nF ST1_R 470nF ST2_R 470nF ST3_R 470nF MONO 470nF 9 8 7 6 5 OUT_RF OUT_LR MID_LI MID_LO OUT_RR SMEXT BASS_RO BASS_RI BASS_LO BASS_LI DIFFGND_L STEREO4_L STEREO1_L STEREO2_L STEREO3_L MUXOUT_L MID_RO MID_RI 33 4.7uF 32 4.7uF 31 30 29 4.7uF 28 27 100nF 26 100nF 25 100nF 24 100nF 23 22nF 2.7K 18nF 5.6K 5.6K 18nF 2.7K 22nF OUT_RF OUT_LR 2.2uF PT2037 OUT_RR 10 STEREO3_R 11 MONO LOUD_L DIFF_L IN_L INPUTS DIFFG_L 47nF DIFF_L ST4_L ST1_L ST2_L ST3_L CSM 14 15 16 17 18 19 20 21 22 Notes: 1. AGND and DGND trace on the PCB layout must be separated, tight separated GND path together on the bypassing capacitor negative terminal. 2 A 50 resistor on the DGND path could minimize the I C noises to interference audio outputs. 2. Refer the differential input section description to achieve correspond wiring instruction. 12 4.7uF 13 4.7uF 470nF 470nF 470nF 470nF 2.2nF 2.2uF V1.2 2 October 2009 PT2037 ORDER INFORMATION Valid Part Number PT2037-LQ Package Type 44 Pins, LQFP Top Code PT2037-LQ PIN CONFIGURATION V1.2 3 October 2009 PT2037 PIN DESCRIPTION Pin Name TREB_R IN_R MUXOUT_R LOUD_R DIFFGND_R DIFF_R STEREO4_R STEREO1_R STEREO2_R STEREO3_R MONO LOUD_L DIFFGND_L DIFF_L STEREO4_L STEREO1_L STEREO2_L STEREO3_L CSM IN_L MUXOUT_LR MID_RI MID_RO BASS_LI BASS_LO BASS_RI BASS_RO SMEXT OUT_RR MID_LO I/O I I O I I I I I I I I I I I I I I I I I O I O I O I O I O O Description External Cap for the right channel treble filter Volume input of the right channel Sources selection multiplexer output of the right channel External Cap for the right channel loudness filter Negative input of the differential amplifier, right channel Positive input of the differential amplifier, right channel Single-ended input No.4 of the right channel Single-ended input No.1 of the right channel Single-ended input No.2 of the right channel Single-ended input No.3 of the right channel Mono audio input External Cap for the left channel loudness filter Negative input of the differential amplifier, left channel Positive input of the differential amplifier, left channel Single-ended input No.4 of the left channel Single-ended input No.1 of the left channel Single-ended input No.2 of the left channel Single-ended input No.3 of the left channel Determinate soft mute time constant, connect a cap to GND Volume input of the left channel Sources selection multiplexer output of the left channel Right channel mid filter input Right channel mid filter output Left channel bass filter input Left channel bass filter output Right channel bass filter input Right channel bass filter output Soft mute hardware control pin, internal pull up to half of AVDD, pull down to GND active soft mute function, open or pull up to AVDD for normal operation. Right channel rear output Left channel mid filter output 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 V1.2 4 October 2009 PT2037 Pin Name MID_LI OUT_LR OUT_RF OUT_LF PAUSE DGND SDA SCL CREF ADDR DVDD AVDD AGND TREB_L I/O I O O O O I I I I I Left channel mid filter input Left channel rear output Right channel front output Left channel front output Pause detector output Digital ground I2C data input/output I2C clock input Internal reference bypass, connect a cap to AGND I C chip address selection, keep open=88H, pull up to DVDD =8AH. Digital power supply Analog power supply Analog ground External cap for left channel treble filter 2 Description Pin No. 31 32 33 34 35 36 37 38 39 40 41 42 43 44 V1.2 5 October 2009 PT2037 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 V1.2 6 October 2009 |
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