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, LEDTV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 DRCThe TAS5727 is a 25-W, efficient, digital-audio power amplifier fordriving stereo bridge-tied speakers. One serial data input allowsprocessing of up to two discrete audio channels and seamlessintegration to most digital audio processors and MPEG decoders. Thedevice accepts a wide range of input data and data rates. A fullyprogrammable data path routes these channels to the internalspeaker drivers.The TAS5727 is a slave-only device receiving all clocks fromexternal sources. The TAS5727 operates with a PWM carrier between a384-kHz switching rate and a 288-KHz switching rate, depending onthe input sample rate. Oversampling combined with a fourth-ordernoise shaper provides a flat noise floor and excellent dynamicrange 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 FiltersGeneral 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 PackageTAS5727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TAS5727EVMTAS5727 25W Digital Input Amplifier with EQ and 2-Band DRCThe TAS5727EVM evaluation module demonstrates the TAS5727 devicefrom Texas Instruments. The TAS5727 combines a high-performance PWMprocessor with a class-D audio power amplifier. This EVM can beconfigured with two bridge-tied loads (BTL) (2.0). The Pulse WidthModulator (PWM) is based on TI’s Equibit™ technology. The TAS5727has additional audio processing features like 3D, Bass Boost and2-band DRC.The EVM software, with its graphic user interface (GUI),facilitates evaluation by providing access to the TAS5727EVMregisters through a USB port.TAS5727EVM 和MC57xxPSIA 主要特性：• Channelevaluation 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 andpower to an external subwoofer board• Double-sided, plated-through PCB, 1oz copper, 2mm• Access to control signal gain and data format throughEVM-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）：
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