TI 公司针对TSC2117带D类放大器和音频编解码器的解决方案（英文版）

　　TI 公司的TSC2117是带立体声D类扬声器放大器和嵌入了miniDSP的音频编解码器，并具有智能四线触摸屏控制器和立体声音频DAC,单声道ADC和SAR ADC. TSC2117支持16位的立体声播放和单声道录音，集成了多个模拟接口如麦克风接口，耳机驱动器和扬声器驱动器，用于数字音频处理的两个可编程miniDSP. TSC2117工作电压2.7V03.6V,能向D类BTL 8欧姆提供立体声1.29W功率，可用在。手提游戏机，移动互联网设备厂和自适应滤波器。本文介绍了TSC2117的主要特性，方框图， 典型电路配置图以及USB-MODEVM板的电路图和材料清单。

　　TSC2117:Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller

　　The TSC2117 is a low-power, highly integrated, high-performance codec and touch-screen controller which features stereo class-D speaker amplifiers, a stereo audio DAC, mono audio ADC, and a SAR ADC.

　　The TSC2117 supports 16-bit stereo playback and monaural record functionality. The device integrates several analog features, such as a microphone interface, headphone drivers, and speaker drivers. The TSC2117 has two fully programmable miniDSPs for digital audio processing. The digital audio data format is programmable to work with popular audio standard protocols （I2S, left/right-justified） in master, slave, DSP, and TDM modes. Bass boost, treble, or EQ are supported by the preprogrammed modes of the programmable digital signal-processing block. An on-chip PLL provided the high-speed clock needed by the digital signal-processing block. The volume level can be controlled by either a pin control or by register control.

　　The TSC2117 has a 12-bit converter that supports a four-wire resistive touch-screen complete with drivers. All functions can be controlled by an I2C or SPI interface. A programmable beep generator is included. An on-chip processor is used in the touch-screen mode and provides extensive features specifically designed to reduce the host-processor and interface-bus overhead. The TSC2117 has three dedicated analog inputs for system voltage measurements, with an on-chip temperature sensore that can be read by the SAR ADC, and is availale in a 7-mm × 7-mm 48-pin QFN package.

　　TSC2117主要特性：

　　Low-Power 13-mW Stereo 48-kHz Playback

　　Stereo Audio DAC and Monaural ADC Support 8-kHz to 192-kHz Sample Rates

　　Instruction-Programmable miniDSP Available for Record and Playback Paths

　　Bass Boost/Treble/EQ With up to Five Biquads for Record and up to Six Biquads for Playback

　　Stereo 1.29-W Class-D BTL 8- Speaker Driver With Direct Battery Connection

　　Smart Four-Wire Touch-Screen Controller WIth Autonomous Timing

　　Programmable-Gain Amplifiers

　　Microphone Bias

　　Hardware-Implemented AGC Used With Microphone Input for Audio ADC Path

　　Digital Microphone Interface

　　Digital Mixing Capability

　　Pin Control or Register Control for Digital-Playback Volume-Control Settings

　　Programmable 12-Bit SAR ADC

　　Built-in Capability for Temperature, Battery, or Auxiliary Measurements

　　Programmable DRC for Digital Playback

　　Sine-Wave Generator for Beep Generator for Touch-Pad Press Acknowledgement

　　Integrated PLL Used for Programmable Digital Audio Processor

　　SPI,I2C, and I2S Serial Interfaces

　　SPI, I2C Have Register Auto-Increment

　　Full Power-Down Control

　　Power Supplies:

　　Analog: 2.7 V-3.6 V

　　Digital Core: 1.65 V-1.95 V

　　Digital I/O: 1.1 V-3.6 V

　　Class-D: 2.7 V-5.5 V （SLVDD and SRVDD ≥ AVDD）

　　7-mm × 7-mm 48-QFN Package

　　TSC2117应用：

　　Portable Gaming Devices

　　Mobile Internet Devices

　　Adaptive Filtering Applications

图1.TSC2117功能方框图

图2.TSC2117典型电路配置图

　　TSC2117EVM-K评估模块（EVM）和USB-MODEVM板

　　The TSC2117EVM-K evaluation module （EVM） features a TSC2117 touch screen controller with stereo audio codec, amplifiers for speakers and headphones and a digital signal processing module. Together with the USB-MODEVM board, the TSC2117 Control Software and a PC running Windows? XP it is a plug-and-play solution to evaluate the capabilities of the TSC2117.

　　USB-MODEVM Schematic

图3.USB-MODEVM电路图(1)

图4.USB-MODEVM电路图(2)

图5.USB-MODEVM电路图(3)

　　USB-MODEVM材料清单：

　　TI公司简介

　　德州仪器（Texas Instruments），简称TI，是的半导体公司，为现实世界的信号处理提供创新的数字信号处理及模拟器件技术。除半导体业务外，还提供包括教育产品和数字光源处理解决方案。TI总部位于美国得克萨斯州的达拉斯，并在25个多国家设有制造、设计或销售机构。

　　音频解码器介绍

　　一般来说，音频解码器分为两类，一类是用于Hi-Fi听音的纯音频解码器，即指把CD机等数字音源器材一分为二后，去掉转盘（驱动光碟旋转读盘）的部分。纯音频解码器的主要作用是把读取的数字音频信息转换成模拟音频信号输出，供功率放大重放。因此严格说纯音频解码器应称作D/A（数字/模拟）转换器。另一类即AV影音解码器，即平常所说的在“家庭影院”设备中使用的解码器，主要作用是把录音时经过编码的多声道音频信息作解码还原，经D/A转换后供功率放大重放。