Preliminary PT2337 Stereo 2W Class-D Amplifier With Built-In Audio Processor DESCRIPTION FEATURES The PT2337 is an integrated audio amplifier design for the low voltage (5V) application purpose, built-in stereo 2W Class-D power amplifier with audio processor, it provides 4 stereo sources selector, and all signal process is based on pure analog processing to maintain high performances and low power consumption. The audio processor includes all the advanced control functions such like digital controlled volume, treble and bass control. The whole chip functions are controlled via I2C bus. • Supply voltage: 3 ~ 6V • 2W X 2 Class-D power amplifier (VDD=5V, RL=4Ω) • 4 Stereo inputs • 32 steps, independent channel volume controller • Bass and treble control. • 2 voltage gain setting for power amp, (20dB, 26dB) • Pop-Free circuitry eliminates unpleasant noises during power ON/OFF. • Low power shutdown • High PSRR • High RF radiation immunity. • Over heat/over current protection • Controlled by I2C interface • Pin-compatible with PT2334 (Partly functions compatible) • LQFP 48 pins package APPLICATIONS • • • • • Portable player duck speaker system Portable media player Digital photo frame Flat panel display and TV Other audio applications BLOCK DIAGRAM RT RB2 RB1 R1 R-VOL R2 T REBLE R3 BASS ROUT R4 Vref RINP VDD GND AVDD AGND Power Management BYPASS RINN RCH 2W CLASS-D Vref RVDD ROP RGND RON SD LGND OE SDA SCL L4 LCH 2W CLASS-D Cont rol Interface LVDD LOP LINN Vref LINP L3 L2 LON T REBLE BASS LOUT L-VOL L1 LT LB2 LB1 Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT2337 APPLICATION CIRCUIT HOST MCU 68n 8.2K 0.47uF 2.2uF 0.47uF 820p 0.1u 0.47uF 0.22uF 68n 0.47uF 10 9 8 7 6 5 4 3 2 1 R4 RT RB2 RB1 ROUT SCL SDA SD OE AVDD RINN 48 R1 NC 47 15 NC RON 46 16 NC RGND 45 17 NC RVDD 44 18 NC ROP 43 L3 19 NC LOP 42 R3 20 NC LVDD 41 21 L1 LGND 40 22 L2 LON 0.47uF R2 0.47uF 0.47uF AGND LINN 35 36 37 34 FB 1nF 0.1uF 1nF RSPK FB 1uF FB 1nF 10uF 1nF LSPK FB 0.47uF 0.47uF 0.1uF 68n LINP NC 2.2uF 820p 38 33 30 29 NC NC 26 28 LB2 25 27 LT LB1 L4 LOUT 24 FB 39 NC VDD 0.47uF L3 32 R4 23 31 0.47uF GND L4 PT2337 BYPASS Source 4 14 11 Source 3 R2 RINP R1 L2 Source 2 13 R3 0.47uF 12 L1 Source 1 +5V 100uF 10 8.2K 68n PRE1.1 2 July, 2009 PT2337 ORDER INFORMATION Valid Part Number PT2337-LQ (L) Package Type 48 Pins, LQFP Top Code PT2337-LQ PIN CONFIGURATION PRE1.1 3 July, 2009 PT2337 PIN DESCRIPTION Pin Name RINN AVDD OE SD SDA SCL ROUT RB1 RB2 RT R4 R3 R2 R1 NC NC NC NC NC NC L1 L2 L3 L4 LT LB2 LB1 LOUT NC NC GND BYPASS VDD NC AGND LINN LINP NC LON LGND LVDD LOP ROP RVDD RGND RON NC RINP PRE1.1 I/O Description Pin No. I Negative input of right channel Class-D amp 1 P Power input for analog circuits 2 I Output enable setting, connect a 0.22μF cap to GND. 3 Shutdown. Sets to low level will turn off whole chip and pull up to High level is back to 4 I normal operation. 2 I I C bus data input 5 I I2C bus clock input 6 O Right channel line out 7 I Capacitor 1 for right channel Bass controller 8 O Capacitor 2 for right channel Bass controller 9 I Capacitor for right channel Treble controller 10 I Input 4 of right channel 11 I Input 3 of right channel 12 I Input 2 of right channel 13 I Input 1 of right channel 14 - No connect 15 - No connect 16 - No connect 17 - No connect 18 - No connect 19 - No connect 20 I Input 1 of left channel 21 I Input 2 of left channel 22 I Input 3 of left channel 23 I Input 4 of left channel 24 I Capacitor for left channel treble controller 25 I Capacitor 2 for left channel bass controller 26 O Capacitor 1 for left channel bass controller 27 O Left channel line out 28 - No connect 29 - No connect 30 P Ground 31 P Bypass cap for internal voltage reference, a 2.2µF cap is recommended. 32 P Power input 33 - No connect 34 P Ground for analog circuits 35 I Negative input of left channel Class-D amp 36 I Positive input of left channel Class-D amp 37 - No connect 38 O Negative output of left channel Class-D amp 39 P Power ground of left channel Class-D amp 40 P Power input of left channel Class-D amp 41 O Positive output of left channel Class-D amp 42 O Positive output of right channel Class-D amp 43 P Power input of right channel Class-D amp 44 P Power ground of right channel Class-D amp 45 O Negative output of right channel Class-D amp 46 - No connect 47 I Positive input of right channel Class-D amp 48 4 July, 2009 PT2337 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 PRE1.1 5 July, 2009