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. • • • • • • • • • • • • • APPLICATIONS • • • • • Portable player duck speaker system Portable media player Digital photo frame Flat panel display and TV Other audio applications • 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 BLOCK DIAGRAM RT RB2 RB1 R1 R-VOL R2 T REBLE R3 R4 BASS Vref RINP VDD GND AVDD AGND RINN RCH 2W CLASS-D Power Management BYPASS Vref LGND OE SCL RVDD ROP RGND RON SD SDA ROUT LCH 2W CLASS-D Control Interface LON LVDD LOP LINN Vref LINP L4 L3 L2 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 V1.0 2 November, 2010 PT2337 ORDER INFORMATION Valid Part Number PT2337-LQ Package Type 48 Pins, LQFP Top Code PT2337-LQ PIN CONFIGURATION V1.0 3 November, 2010