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2011-05-07 12:39:22
TI 公司的TAS5727是 用来驱动桥接扬声器的25W数字，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）：
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