PT2811

3W Stereo Class-D Amplifier with

Audio Processor

Tel: 886-66296288

‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan

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

 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

LVDD

LON

LGND

LOP

RGND

ROP

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

R1

DIFFR-

Fully-Differential

input

SD

Power

Management

OE

Protection Circuitry