原标题：TI TLV320AIC3254低功耗立体声CODEC开发方案

　　TI 公司的TLV320AIC3254是低压低功耗立体声音频CODEC器件,具有可编程的输入和输出. TLV320AIC3254集成了PowerTune功能,全编程的miniDSP,固定的预定夷和参数化信号处理区块,PLL,LDO和灵活的数字接口. TLV320AIC3254中的立体声音频DAC具有100dB的SNR, 4.1mW 立体声 48ksps DAC,立体声音频ADC具有93dB SNR和6.1mW 立体声 48ksps ADC 录音.可广泛用于手提导航系统(PND),PMP,手机,通信和手提计算,回声消除(AEC)和噪音消除以及高档DSP算法.本文介绍了TLV320AIC3254主要特性,方框图,典型电路配置以及TLV320AIC3254EVM-K评估套件的主要特性, 方框图,详细电路图和材料清单.同时还介绍了USB-MODEVM的详细电路图和材料清单.

　　The TLV320AIC3254 (sometimes referred to as the AIC3254) is a flexible, low-power, low-voltage stereo audio codec with programmable inputs and outputs. PowerTune capabilities, fully programmable miniDSP, fixed predefined and parameterizable signal processing blocks, integrated PLL integrated LDOs and flexible digital interfaces.

　　TLV320AIC3254主要特性:

　　Stereo Audio DAC with 100dB SNR

　　4.1mW Stereo 48ksps DAC Playback

　　Stereo Audio ADC with 93dB SNR

　　6.1mW Stereo 48ksps ADC Record

　　PowerTune™

　　Extensive Signal Processing Options

　　Embedded miniDSP

　　Six Single-Ended or 3 Fully-Differential Analog Inputs

　　Stereo Analog and Digital Microphone Inputs

　　Stereo Headphone Outputs

　　Stereo Line Outputs

　　Very Low-Noise PGA

　　Low Power Analog Bypass Mode

　　Programmable Microphone Bias

　　Programmable PLL

　　Integrated LDO

　　5 mm x 5 mm 32-pin QFN Package

　　TLV320AIC3254应用:

　　Portable Navigation Devices (PND)

　　Portable Media Player (PMP)

　　Mobile Handsets

　　Communication

　　Portable Computing

　　Acoustic Echo Cancellation (AEC)

　　Active Noise Cancellation (ANC)

　　Advanced DSP algorithms

　　图1.TLV320AIC3254简化方框图

　　图2.TLV320AIC3254典型电路配置

　　TLV320AIC3254EVM-K评估套件

　　The TLV320AIC3254EVM-K is a complete evaluation/demonstration kit, which includes a USB-based motherboard called the USB-MODEVM Interface board and evaluation software for use with a personal computer (PC) running the Microsoft Windows operating systems.

　　The TLV320AIC3254EVM-K is operational with one USB cable connection to a PC. The USB connection provides power, control, and streaming audio data to the EVM for reduced setup and configuration. The EVM also allows external control signals, audio data, and power for advanced operation, which allows prototyping and connection to the rest of the development or system evaluation.

　　The TLV320AIC3254EVM-K consists of two separate circuit boards, the USB-MODEVM and the TLV320AIC3254EVM. The USB-MODEVM is built around the TAS1020B streaming audio USB controller with an 8051-based core. The motherboard features two positions for modular EVMs, or one double-wide serial modular EVM can be installed. The TLV320AIC3254EVM is one of the double-wide modular EVMs that is designed to work with the USB-MODEVM.

　　TLV320AIC3254EVM-K评估套件主要特性:

　　Full-featured evaluation board for the TLV320AIC3254 stereo audio codec.

　　USB connection to PC provides power, control, and streaming audio data for easy evaluation.

　　Onboard microphone for ADC evaluation

　　Connection points for external control and digital audio signals for quick connection to other circuits/input devices.

　　The TLV320AIC3254EVM-K is a complete evaluation kit, which includes a universal serial bus (USB)-based motherboard and evaluation software for use with a personal computer running the Microsoft Windows™ operating system (Win2000 or XP).

　　图3.TLV320AIC3254EVM-K 方框图

　　TLV320AIC3254EVM Schematic

　　图4.TLV320AIC3254EVM-K电路图(1)

　　图5.TLV320AIC3254EVM-K电路图(2)

　　TLV320AIC3254EVM材料清单(BOM):

　　USB-MODEVM Schematic

　　图6. USB-MODEVM电路图(1)

　　图7. USB-MODEVM电路图(2)

　　图8. USB-MODEVM电路图(3)

　　USB-MODEVM材料清单(BOM):