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3W Stereo Class-D Amplifier with Audio Processor
DESCRIPTION
The PT2811 is an integrated 3W stereo Class-D amplifier with audio processor. The input selector supports 3 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
FEATURES
Supply Voltage: 3~6V 3W X 2 Class-D power amplifier (VDD=5V, RL=4Ω) 1 Fully-Differential input 3 Single-Ended audio inputs Programmable input gain from 0 to +15dB Bass and Treble control 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 Controlled by I2C interface Available in 48 Pins, LQFP package block diagram LOUT LT L3 L2 LB1 LB2 R2 R3 RT RB1 RB2 DIFFL-DIFFL+ DIFFR+ OSC Generator ROUT SDA LINN LINP LVDDLON LGND LOP RGNDROP RVDD RON RINN RINP GND Bypass VDD SCL Digital Interface Soft Mute INPUT Gain Volume Soft Step (0~-79dB) Treble Bass Treble Bass INPUT Multiplexer Soft Mute INPUT Gain Volume Soft Step (0~-79dB) Logic Control LCH CLASS-D (+20/+26 dB) RCH CLASS-D (+20/+26 dB) INPUT Multiplexer L1 R1DIFFR- Fully-Differential input SD Power Management OE Protection Circuitry
3W Stereo Class-D Amplifier with Audio Processor V1.1 2 January 2014 APPLICATION CIRCUIT 68nF C178.2K R6 2nF C16 68nF C18 2.2uF C21 1uF C2 Audio BT TV Tuner AUX 1nF C28 FBL3 RSPK 1nF C29 L4 FB 1nF C30 FBL5 LSPK 1nF C31 L6 FB 1uFC27 1uFC26 10uF C33 FBL2 FBL1 C34 100uF GND +5V 10uF C32 1uF C25 1uF C37 1uF C35 1uF C36 68nF C4 68nF C5 8.2K R2 2nF C6 1uF C22 1uF C1Host MCU DIFFL- DIFFR- DIFFR+ NC RINN LINN NC LON LGND LVDD LOP ROP RVDD NC RON RGND RINP RT RB2 RB1 ROUT SCL SDA VDD2 OE SD LINP LT LB2 LB1 LOUT NC GND2 BYPASS NC PT2811 NC NC NC NC GND1 VDD1 DIFFL+ BT=Bluetooth module with fully differential output. The ferrite bead lowpass filter is an optional item; it is useful to reduction the EMI emission. Lowpass Filter (option)
3W Stereo Class-D Amplifier with Audio Processor V1.1 3 January 2014 ORDER INFORMATION Valid Part Number Package Type Top Code PT2811-LQ 48 Pins, LQFP, 7 X 7 mm PT2811-LQ PIN CONFIGURATION DIFFL- DIFFR- DIFFR+ NC RINN LINN NC LON LGND LVDD LOP ROP RVDD NC RON RGND RINP RT RB2 RB1 ROUT SCL SDA VDD2 OE SD LINP LT LB2 LB1 LOUT NC GND2 BYPASS NC PT2811 NC NC NC NC GND1 VDD1 DIFFL+
3W Stereo Class-D Amplifier with Audio Processor V1.1 4 January 2014 PIN DESCRIPTION Pin Name I/O Description Pin No. RINN I Negative input of right channel Class-D amp 1 RINP I Positive input of right channel Class-D amp 2 NC - No connection 3 VDD1 P Power input for internal circuits 4 VDD2 P Power input for internal circuits 5 SD I Shutdown control pin. Sets to “logic-low” will turn off whole chip and pull up to “logic-high” to back to normal operation. 6 SDA I I2C bus data input 7 SCL I I2C bus clock input 8 ROUT O Right channel line out 9 RB1 I Capacitor 1 for right channel Bass controller 10 RB2 O Capacitor 2 for right channel Bass controller 11 RT I Capacitor for right channel Treble controller 12 NC - No connection 13 R3 I Input 3 of right channel 14 R2 I Input 2 of right channel 15 R1 I Input 1 of right channel 16 DIFFR+ I Differential right channel “+” input 17 DIFFR- I Differential right channel “-” input 18 DIFFL- I Differential left channel “-“ input 19 DIFFL+ I Differential left channel “+” input 20 L1 I Input 1 of left channel 21 L2 I Input 2 of left channel 22 L3 I Input 3 of left channel 23 NC - No connection 24 LT I Capacitor for left channel Treble controller 25 LB2 O Capacitor 2 for left channel Bass controller 26 LB1 I Capacitor 1 for left channel Bass controller 27 LOUT O Left channel line out 28 BYPASS P Bypass cap for Internal Voltage Reference, a 2.2µF cap is recommended. 29 OE I Output Enable setting, connect a 0.22F cap to GND. 30 GND2 P Ground 31 GND1 P Ground 32 NC - No connection 33 LINP I Positive input of left channel Class-D amp 34 LINN I Negative input of left channel Class-D amp 35 NC - No connection 36 NC - No connection 37 LON O Negative output of left channel Class-D amp 38 NC - No connection 39 LGND P Power ground of left channel Class-D amp 40 LVDD P Power input of left channel Class-D amp 41 LOP O Positive output of left channel Class-D amp 42 ROP O Positive output of right channel Class-D amp 43 RVDD P Power input of right channel Class-D amp 44 RGND P Power ground of right channel Class-D amp 45 NC - No connection 46 RON O Negative output of right channel Class-D amp 47 NC - No connection 48
3W Stereo Class-D Amplifier with Audio Processor V1.1 22 January 2014 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 tim e. 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