摘要：  本文介绍了TAS5727主要特性，功能框图，简化应用电路，评估模块TAS5727EVM 和MC57xxPSIA 主要特性，电路图以及评估模块TAS5727EVM的材料清单(BOM)。

关键字：  扬声器，  放大器，  LCD，  LED TV

TI 公司的TAS5727是 用来驱动立体声桥接扬声器的25W数字音频功率放大器，VDD电压从8V到26V，在20V电源时能向8欧姆负载提供25W功率，还支持BTL配置的4欧姆负载，支持44.1-kHz 到 48-kHz的取样频率，主要用在LCD TV， LED TV和条形音箱。本文介绍了TAS5727主要特性，功能框图，简化应用电路，评估模块TAS5727EVM 和MC57xxPSIA 主要特性，电路图以及评估模块TAS5727EVM的材料清单(BOM)。

25-W DIGITAL AUDIO POWER AMPLIFIER WITH EQ AND DRC

The TAS5727 is a 25-W， efficient， digital-audio power amplifier for driving stereo bridge-tied speakers. One serial data input allows processing of up to two discrete audio channels and seamless integration to most digital audio processors and MPEG decoders. The device accepts a wide range of input data and data rates. A fully programmable data path routes these channels to the internal speaker drivers.

The TAS5727 is a slave-only device receiving all clocks from external sources. The TAS5727 operates with a PWM carrier between a 384-kHz switching rate and a 288-KHz switching rate， depending on the input sample rate. Oversampling combined with a fourth-order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.

TAS5727主要特性：

Audio Input/Output

25 W Into an 8-Ω Load From a 20-V Supply

Wide PVDD Range， From 8 V to 26 V

Supports BTL Configuration With 4-Ω Load

Efficient Class-D Operation Eliminates Need for Heatsinks

One Serial Audio Input (Two Audio Channels)

I2C Address Selection Pin (Chip Select)

Single Output Filter PBTL Support

Supports 44.1-kHz to 48-kHz Sample Rate (LJ/RJ/I2S)

Audio/PWM Processing

Independent Channel Volume Controls With Gain of 24 dB to

Mute With 0.125-dB Resolution Steps

Programmable Two-Band Dynamic-Range Control

18 Programmable Biquads for Speaker EQ and Other

Audio-Processing Features

Programmable Coefficients for DRC Filters

DC Blocking Filters

General Features

I2C Serial Control Interface

Operational Without MCLK

Requires Only 3.3 V and PVDD

No External Oscillator: Internal Oscillator for Automatic

Rate Detection

Surface-Mount， 48-Pin HTQFP Package

TAS5727应用：

LCD TV， LED TV， Soundbar

图1。TAS5727功能框图

图2。TAS5727功率级功能框

图3。TAS5727简化应用框图

TAS5727 25W数字数字放大器TAS5727EVM

TAS5727 25W Digital Input Amplifier with EQ and 2-Band DRC

The TAS5727EVM evaluation module demonstrates the TAS5727 device from Texas Instruments. The TAS5727 combines a high-performance PWM processor with a class-D audio power amplifier. This EVM can be configured with two bridge-tied loads (BTL) (2.0). The Pulse Width Modulator (PWM) is based on TI’s Equibit technology. The TAS5727 has additional audio processing features like 3D， Bass Boost and 2-band DRC.

The EVM software， with its graphic user interface (GUI)， facilitates evaluation by providing access to the TAS5727EVM registers through a USB port.

TAS5727EVM 和MC57xxPSIA 主要特性：

Channel evaluation module design

Self-contained protection systems and control pins

USB interface

Standard I2S data input using optical or coaxial inputs

Analog input through analog-to-digital converter

Subwoofer connection—the PWM terminal provides the PWM signal and power to an external subwoofer board

Double-sided， plated-through PCB， 1oz copper， 2mm

Access to control signal gain and data format through EVM-software GUI

图4。TAS5727EVM评估模块外形图

图5。TAS5727EVM信号通路和完整系统框图

图6。TAS5727EVM 和MC57xxPSIA 通用连接图

图7。TAS5727EVM 电路图

图8。MC57xxPSIA电路图(1)

图9。MC57xxPSIA电路图(2)

图10。MC57xxPSIA电路图(3)

TAS5727EVM材料清单(BOM)：