PT2037 Digitally Controlled Audio Processor DESCRIPTION FEATURES 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. • 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 STEREO2_R STEREO3_R STEREO4_R DIFF_R DIFFGND_R DVDD AVDD 31 25 BASS_LI STEREO1_R BASS_LO MONO 30 MID_LI DIFFGND_L MID_LO DIFF_L 44 24 16 SPEAKER ATT 17 18 VOLUME +LOUDN IN GAIN 15 INPUT MULTIPLEXER STEREO4_L 12 TREB_L STEREO3_L 20 LOUD_L STEREO2_L IN_L MUXOUT_L 21 STEREO1_L 14 13 11 8 9 10 TREBLE MIDDLE SOFT MUTE BASS SPEAKER ATT 34 33 40 38 I2C BUS DECODER +LATCHES 37 36 7 VOLUME +LOUDN IN GAIN TREBLE MIDDLE SOFT MUTE BASS SPEAKER ATT 29 OUT_LF OUT_LR ADDR SCL SDA DGND OUT_RR 6 SPEAKER ATT 5 41 42 OUT_RF MUTE CONTROL SOFT,ZERO SUPPLY 43 32 39 3 2 4 1 23 22 27 26 28 35 19 CSM PAUSE SMEXT BASS_RI BASS_RO MID_RI MID_RO TREB_R LOUD_R IN_R MUXOUT_R CREF AGND Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT2037 APPLICATION CIRCUIT POWER VDD GND MCU 2 1 50 OUT_LF 4.7uF 34 OUT_LF 35 PAUSE 36 DGND 37 SDA 38 SCL 39 CREF 40 ADDR 41 DVDD 42 AVDD 43 AGND 44 TREB_L TREB_R OUTPUTS 10uF 5.6nF 1 100n 22uF ADDR SEL 22uF OUT_RF 33 2.2uF 2 IN_R OUT_LR 32 OUT_RF 4.7uF 5.6nF OUT_LR 4.7uF 3 MUXOUT_R MID_LI 31 4 LOUD_R MID_LO 30 5 DIFFGND_R OUT_RR 29 47nF DIFFG_R PT2037 4.7uF DIFF_R 6 DIFF_R 7 STEREO4_R 18nF 2.7K 22nF OUT_RR 4.7uF SMEXT 28 BASS_RO 27 4.7uF ST4_R 100nF 470nF 8 ST1_R STEREO1_R BASS_RI ST2_R 100nF 9 STEREO2_R BASS_LO 25 100nF 470nF 10 STEREO3_R ST3_R BASS_LI DIFFGND_L DIFF_L STEREO4_L STEREO1_L STEREO2_L STEREO3_L CSM IN_L MUXOUT_L MID_RI 13 14 15 16 17 18 19 20 21 22 DIFFG_L 12 INPUTS LOUD_L 11 MONO 470nF 2.2nF 470nF 470nF 470nF 470nF 4.7uF 4.7uF 47nF DIFF_L 5.6K 24 100nF 470nF MONO 5.6K 26 470nF MID_RO 23 22nF 2.7K 18nF 2.2uF ST4_L ST1_L ST2_L ST3_L 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 50Ω 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. 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 I/O Description Pin No. TREB_R I External Cap for the right channel treble filter 1 IN_R I Volume input of the right channel 2 MUXOUT_R O Sources selection multiplexer output of the right channel 3 LOUD_R I External Cap for the right channel loudness filter 4 DIFFGND_R I Negative input of the differential amplifier, right channel 5 DIFF_R I Positive input of the differential amplifier, right channel 6 STEREO4_R I Single-ended input No.4 of the right channel 7 STEREO1_R I Single-ended input No.1 of the right channel 8 STEREO2_R I Single-ended input No.2 of the right channel 9 STEREO3_R I Single-ended input No.3 of the right channel 10 MONO I Mono audio input 11 LOUD_L I External Cap for the left channel loudness filter 12 DIFFGND_L I Negative input of the differential amplifier, left channel 13 DIFF_L I Positive input of the differential amplifier, left channel 14 STEREO4_L I Single-ended input No.4 of the left channel 15 STEREO1_L I Single-ended input No.1 of the left channel 16 STEREO2_L I Single-ended input No.2 of the left channel 17 STEREO3_L I Single-ended input No.3 of the left channel 18 CSM I Determinate soft mute time constant, connect a cap to GND 19 IN_L I Volume input of the left channel 20 MUXOUT_LR O Sources selection multiplexer output of the left channel 21 MID_RI I Right channel mid filter input 22 MID_RO O Right channel mid filter output 23 BASS_LI I Left channel bass filter input 24 BASS_LO O Left channel bass filter output 25 BASS_RI I Right channel bass filter input 26 BASS_RO O Right channel bass filter output 27 SMEXT I 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. 28 OUT_RR O Right channel rear output 29 MID_LO O Left channel mid filter output 30 V1.2 4 October 2009 PT2037 Pin Name I/O Description Pin No. MID_LI I Left channel mid filter input 31 OUT_LR O Left channel rear output 32 OUT_RF O Right channel front output 33 OUT_LF O Left channel front output 34 PAUSE O Pause detector output 35 DGND - Digital ground 36 SDA I I2C data input/output 37 SCL I I2C clock input 38 CREF I Internal reference bypass, connect a cap to AGND 39 2 ADDR I I C chip address selection, keep open=88H, pull up to DVDD =8AH. 40 DVDD - Digital power supply 41 AVDD - Analog power supply 42 AGND - Analog ground 43 TREB_L I External cap for left channel treble filter 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