原标题：TI TLV320AIC3107低功耗立体声CODEC方案

　　TI 公司的TLV320AIC3107是低功耗立体声音频编译码器(CODEC),并集成了立体声耳机放大器和单声道D类扬声器驱动器以及单端或全差分配置的多个输入和输出. TLV320AIC3107中的高性能音频DAC单端信噪比(SNR)可达97dBA,16/20/24/32位数据,支持采样速率从8kHz到96kHz,具有3D/低音/高音/EQ/De-Emphasis效果,高性能音频ADC信噪比(SNR)可达92dBA, 支持采样速率从8kHz到96kHz,并提供数字信号处理和噪音滤波,可用于手机,数码相机,手提媒体播放器和一般的手提音频设备.本文介绍了TLV320AIC3107的主要特性,简化功能方框图以及带寄存器的功能方框图, 评估板TLV320AIC3107EVM的主要特性, 无电容耳机和外接扬声器放大器典型连接图, 评估板电路图与材料清单;此外,还介绍了USB-MODEVM接口板电路图及其材料清单.

　　The TLV320AIC3107 is a low power stereo audio codec with stereo headphone amplifier, and mono class-D speaker driver, as well as multiple inputs and outputs programmable in single-ended or fully differential configurations. Extensive register-based power control is included, enabling stereo 48-kHz DAC playback as low as 15 mW from a 3.3-V analog supply, making it ideal for portable battery-powered audio and telephony applications.

　　The record path of the TLV320AIC3107 contains integrated microphone bias, digitally controlled stereo microphone preamplifier, and automatic gain control (AGC), with mix/mux capability among the multiple analog inputs. Programmable filters are available during record which can remove audible noise that can occur during optical zooming in digital cameras. The playback path includes mix/mux capability from the stereo DAC and selected inputs, through programmable volume controls, to the various outputs.

　　The TLV320AIC3107 contains three high-power output drivers as well as two single-ended line output drivers, and a differential class-D output driver.

　　The high-power output drivers are capable of driving a variety of load configurations, including up to three channels of single-ended 16-Ω headphones using ac-coupling capacitors, or stereo 16-Ω headphones in a capacitorless output configuration. The mono class-D output is capable of differentially driving an 8-Ω speaker.

　　The stereo audio DAC supports sampling rates from 8 kHz to 96 kHz and includes programmable digital filtering in the DAC path for 3D, bass, treble, midrange effects, speaker equalization, and de-emphasis for 32-kHz, 44.1-kHz, and 48-kHz rates. The stereo audio ADC supports sampling rates from 8 kHz to 96 kHz and is preceded by programmable gain amplifiers or AGC that can provide up to 59.5 dB analog gain for low-level microphone inputs. The TLV320AIC3107 provides an extremely high range of programmability for both attack (8-1,408 ms) and for decay (0.05-22.4 seconds). This extended AGC range allows the AGC to be tuned for many types of applications.

　　For battery saving applications where neither analog nor digital signal processing are required, the device can be put in a special analog signal passthru mode. This mode significantly reduces power consumption, as most of the device is powered down during this pass through operation.

　　The serial control bus supports I2C protocol, while the serial audio data bus is programmable for I2S, left/right-justified, DSP, or TDM modes. A highly programmable PLL is included for flexible clock generation and support for all standard audio rates from a wide range of available MCLKs, varying from 512 kHz to 50 MHz, with special attention paid to the most popular cases of 12-MHz, 13-MHz, 16-MHz, 19.2-MHz, and 19.68-MHz system clocks.

　　The TLV320AIC3107 operates from an analog supply of 2.7 V–3.6 V, a digital core supply of 1.65 V–1.95 V, a digital I/O supply of 1.1 V–3.6 V, and a speaker amplifier supply of 2.7V–5.5V. The device is available in the 5 × 5-mm, 40-pin QFN package and in the future a 3.5 × 3-mm, 42-lead WCSP package.

　　TLV320AIC3107主要特性:

　　Stereo CODEC with Integrated Mono Class-D Amplifier

　　High Performance Audio DAC

　　97 dBA Signal-to-Noise Ratio (Single Ended)

　　16/20/24/32-Bit Data

　　Supports Sample Rates From 8 kHz to 96 kHz

　　3D/Bass/Treble/EQ/De-Emphasis Effects

　　Flexible Power Saving Modes and Performance are Available

　　High Performance Audio ADC

　　92 dBA Signal-to-Noise Ratio

　　Supports Rates From 8 kHz to 96 kHz

　　Digital Signal Processing and Noise Filtering Available During Record

　　Seven Audio Input Pins

　　Programmable as 6 Single-Ended or 3 Fully Differential Inputs

　　Capability for Floating Input Configurations

　　Multiple Audio Output Drivers

　　Mono Fully Differential or Stereo Single-Ended Headphone Drivers

　　Single-Ended Stereo Line Outputs

　　Mono 1W Class-D BTL 8Ω Speaker Driver

　　Low Power Consumption: 15-mW Stereo 48-kHz PlaybackWith 3.3-V Analog Supply

　　Ultra-Low Power Mode with Passive Analog Bypass

　　Programmable Input/Output Analog Gains

　　Automatic Gain Control (AGC) for Record

　　Programmable Microphone Bias Level

　　Programmable PLL for Flexible Clock Generation

　　I2C Control Bus

　　Audio Serial Data Bus Supports I2S, Left/Right-Justified, DSP, and TDM Modes

　　Extensive Modular Power Control

　　Power Supplies:

　　Speaker Amp: 2.7 V—5.5 V

　　Analog: 2.7 V—3.6 V.

　　Digital Core: 1.525 V—1.95 V

　　Digital I/O: 1.1 V—3.6 V

　　Packages: 5 × 5 mm 40-QFN, 0.4 mm Pitch

　　3.5 × 3 mm 42-WSCP, 0.5 mm Pitch

　　TLV320AIC3107应用:

　　Cellular Handsets

　　Digital Cameras

　　Portable Media Players

　　General Portable Audio Equipment

　　图1.TLV320AIC3107简化方框图

　　图2.TLV320AIC3107IRSB带寄存器的功能方框图 (ver. 0.95)

　　TLV320AIC3107评估板TLV320AIC3107EVM

　　The TLV320AIC3107EVM is in the Texas Instruments modular EVM form factor, which allows direct evaluation of the device performance and operating characteristics, and eases software development and system prototyping. This EVM is compatible with the 5-6K Interface Evaluation Module (SLAU104) and the HPA-MCUINTERFACE (SLAU106) from Texas Instruments and additional third-party boards which supports the TI Modular EVM format.

　　The TLV320AIC3107EVM-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 PC running the Microsoft Windows operating systems.

　　The USB connection from the PC 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 evaluation/development system.

　　TLV320AIC3107EVM评估板主要特性:

　　Full-featured evaluation board for the TLV320AIC3107 2-channel audio codec with integrated Class-D amplifier.

　　Modular design for use with a variety of digital signal processor (DSP) and microcontroller interface boards.

　　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.

　　图3.无电容耳机和外接扬声器放大器典型连接图

　　图4.TLV320AIC3107EVM评估板电路图(1)

　　图5.TLV320AIC3107EVM评估板电路图(2)

　　TLV320AIC3107EVM 材料清单(BOM):

　　USB-MODEVM接口板电路图

　　The schematic diagram for USB-MODEVM Interface Board

　　图6.USB-MODEVM接口板电路图(1)

　　图7.USB-MODEVM接口板电路图(2)

　　USB-MODEVM接口板材料清单(BOM):