TI 公司的TSC2117是帶立體聲D類揚聲器放大器和嵌入了miniDSP的音頻編解碼器，并具有智能四線觸摸屏控制器和立體聲音頻DAC,單聲道ADC和SAR ADC. TSC2117支持16位的立體聲播放和單聲道錄音，集成了多個模擬接口如麥克風接口，耳機驅動器和揚聲器驅動器，用于數(shù)字音頻處理的兩個可編程miniDSP. TSC2117工作電壓2.7V03.6V,能向D類BTL 8歐姆提供立體聲1.29W功率，可用在。手提游戲機，移動互聯(lián)網設備廠和自適應濾波器。本文介紹了TSC2117的主要特性，方框圖， 典型電路配置圖以及USB-MODEVM板的電路圖和材料清單。

　　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應用：

　　Portable Gaming Devices

　　Mobile Internet Devices

　　Adaptive Filtering Applications

圖1.TSC2117功能方框圖

圖2.TSC2117典型電路配置圖

　　TSC2117EVM-K評估模塊（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

圖3.USB-MODEVM電路圖(1)

圖4.USB-MODEVM電路圖(2)

圖5.USB-MODEVM電路圖(3)

　　USB-MODEVM材料清單：

　　TI公司簡介

　　德州儀器（Texas Instruments），簡稱TI，是的半導體公司，為現(xiàn)實世界的信號處理提供創(chuàng)新的數(shù)字信號處理及模擬器件技術。除半導體業(yè)務外，還提供包括教育產品和數(shù)字光源處理解決方案。TI總部位于美國得克薩斯州的達拉斯，并在25個多國家設有制造、設計或銷售機構。

　　音頻解碼器介紹

　　一般來說，音頻解碼器分為兩類，一類是用于Hi-Fi聽音的純音頻解碼器，即指把CD機等數(shù)字音源器材一分為二后，去掉轉盤（驅動光碟旋轉讀盤）的部分。純音頻解碼器的主要作用是把讀取的數(shù)字音頻信息轉換成模擬音頻信號輸出，供功率放大重放。因此嚴格說純音頻解碼器應稱作D/A（數(shù)字/模擬）轉換器。另一類即AV影音解碼器，即平常所說的在“家庭影院”設備中使用的解碼器，主要作用是把錄音時經過編碼的多聲道音頻信息作解碼還原，經D/A轉換后供功率放大重放。