PT2812 3W Stereo Class-D Amplifier with 3 Inputs and Volume DESCRIPTION FEATURES The PT2812 is an integrated 3W stereo Class-D amplifier with audio processor. The input selector supports 2 Single-Ended and 1 Fully-Differential input can be chose. The highly integration of the audio processor and class-D amplifier can further reduce external components BOM and provides better audio experience. All of functions are controlled via I2C bus. APPLICATIONS PC/Video Projector Portable media player Audio duck system Flat panel display with audio inputs Supply Voltage: 3~6V 3W X 2 Class-D power amplifier (VDD=5V, RL=4Ω) 1 Fully-Differential input 2 Single-Ended audio inputs Programmable input gain from 0 to +15dB Master volume in 1dB/step from 0 to -79dB Advanced soft-mute and multiple soft-step volume technology eliminate audible click during volume and input sources changing. Built-in RF noise filter Shutdown function for power saving Over temperature and over current protection 2 Controlled by I C interface Available in 32 Pins, 4x4 mm QFN package BLOCK DIAGRAM LON LGND LVDD LOP ROP RVDD RGND RON LINP RINP LCH CLASS-D (+20/+26 dB) RCH CLASS-D (+20/+26 dB) OSC Generator LINN RINN SD OE SDA Digital Interface Logic Control SCL VDD Power Management Bypass GND LOUT ROUT Volume (0~-79dB) Protection Circuitry Volume (0~-79dB) INPUT Gain INPUT Gain INPUT Multiplexer L2 L1 Fully-Differential input DIFFL+ DIFFL- DIFFR- DIFFR+ INPUT Multiplexer R1 R2 Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No.233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan PT2812 3W Stereo Class-D Amplifier with Audio Processor APPLICATION CIRCUIT L1 P1 FB +5V C14 10u 1uF C10 L2 FB C15 HOST MCU P2 100u C12 1uF GND C16 10uF 13 LOP 12 LVDD 11 8 9 LINN LON 7 L2 LINP 32 6 10 GND1 LGND 5 L1 GND2 31 C17 1uF L4 FB L5 FB C18 1uF L6 FB C23 1nF C24 1nF ROP FB C21 1nF C22 1nF DIFFL+ RINN RINP VDD1 30 17 18 19 VDD2 DIFFL- U1 RSPK U2 LSPK Lowpass Filter (option) C9 2.2u C13 C21 1u 1uF C11 V1.0 20 1u 29 PT2812 14 4 C8 DIFFR- RVDD OE 1u SD C7 21 1u 28 15 3 C6 DIFFR+ RGND BYPASS 1u SDA C5 27 22 1u R1 16 2 C4 26 RON NC 1u R2 1 C3 25 LOUT 1u SCL AUX C2 ROUT BT 1u 23 24 Tuner C1 L3 1uF 2 August 2013 PT2812 3W Stereo Class-D Amplifier with Audio Processor ORDER INFORMATION Valid Part Number PT2812-QFN Package Type 32 Pins, QFP, 4 X 4 mm Top Code PT2812-QFN V1.0 16 15 14 13 12 11 10 9 RON RGND RVDD ROP LOP LVDD LGND LON PIN CONFIGURATION LINN 8 RINP LINP 7 19 VDD1 GND1 6 20 VDD2 GND2 5 21 SD OE 4 22 SDA BYPASS 3 23 SCL NC 2 24 ROUT LOUT 1 DIFFL+ 30 L2 DIFFL29 32 DIFFR28 L1 DIFFR+ 27 3 31 R1 PT2812-QFN PT2812 26 18 R2 RINN 25 17 August 2013 PT2812 3W Stereo Class-D Amplifier with Audio Processor PIN DESCRIPTION Pin Name LOUT NC BYPASS OE GND1 GND2 LINP LINN LON LGND LVDD LOP ROP RVDD RGND RON RINN RINP VDD1 VDD2 I/O O P I P P I I O P P O O P P O I I P P SD I SDA SCL ROUT R2 R1 DIFFR+ DIFFRDIFFLDIFFL+ L1 L2 I I O I I I I I I I I V1.0 Description Pin No. Left channel line out 1 No connection 2 Bypass cap for Internal Voltage Reference, a 2.2µF cap is recommended. 3 4 Output Enable setting, connect a 0.22F cap to GND. Ground for internal circuits 5 Ground for internal circuits 6 Positive input of left channel Class-D amp 7 Negative input of left channel Class-D amp 8 Negative output of left channel Class-D amp 9 Power ground of left channel Class-D amp 10 Power input of left channel Class-D amp 11 Positive output of left channel Class-D amp 12 Positive output of right channel Class-D amp 13 Power input of right channel Class-D amp 14 Power ground of right channel Class-D amp 15 Negative output of right channel Class-D amp 16 Negative input of right channel Class-D amp 17 Positive input of right channel Class-D amp 18 Power input for internal circuits 19 Power input for internal circuits 20 Shutdown. Sets to low level will turn off whole chip and pull up to High level is back to 21 normal operation. 2 I C bus data input 22 2 I C bus clock input 23 Right channel line out 24 Input 2 of right channel 25 Input 1 of right channel 26 Differential right channel “+” input 27 Differential right channel “-” input 28 Differential left channel “-“ input 29 Differential left channel “+” input 30 Input 1 of left channel 31 Input 2 of left channel 32 4 August 2013 PT2812 3W Stereo Class-D Amplifier with Audio Processor 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 Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.0 17 August 2013