TI PCM1822立体声通路32位192kHz Burr-Brown音频ADC解决方案

TI公司的PCM1822是高性能Burr-Brown™音频模数转换器(ADC),支持高达两路模拟通道同时取样.器件支持满刻度1-VRMS的单端和差分线路与麦克风输入.器件集成了锁相环(PLL),DC移除高通滤波器(HPF),支持取样速率高达192kHz.器件支持时分多路复用(TDM)或I2S音频格式,用硬件引脚电平来选择.此外,PCM1822支持主从模式选择,用于音频总线接口工作.这些集成的高性能特性以及能以单电源3.3V供电的功能,使得器件对于成本效益,空间限制音频系统是极好的选择,应用在远场麦克风录音应用.器件是立体声多比特高性能delta-sigma (ΔΣ) ADC.器件具有动态范围增强器使能,达到117dB; 动态范围增强器禁用的动态范围为111dB.THD+N为-95dB.ADC取样频率(fS)从8kHz到192kHz. PCM1822的工作温度为–40°C 到 +125°C,采用20引脚WQFN封装.主要用在智能扬声器,DVD录像机和播放机,AV接收器,视频会议系统和IP网络照相机.本文介绍了PCM1822主要特性,简化框图和功能框图, 3.3V AVDD两路模拟麦克风记录框图以及评估模块PCM1822EVM主要特性,电路图,材料清单和PCB设计图.

The PCM1822 is a high-performance, Burr-Brown™ audio analog-to-digital converter (ADC) that supports simultaneous sampling of up to two analog channels.

The device supports single-ended and differential line and microphone inputs with a 1-VRMS full-scale signal. The device integrates a phase-locked loop (PLL), a DC removal high-pass filter (HPF), and supports sample rates up to 192 kHz. The device supports time-division multiplexing (TDM) or I2S audio formats, selectable with the hardware pin level. Additionally, the PCM1822 supports master and slave mode selection for the audio bus interface operation. These integrated high-performance features, along with the ability to be powered from a single supply of 3.3 V, make the device an excellent choice for cost sensitive, space-constrained audio systems in far-field microphone recording applications.

The PCM1822 is specified from –40°C to +125°C, and is offered in a 20-pin WQFN package.

The PCM1822 consists of the following blocks and features:

• Stereo-channel, multibit, high-performance delta-sigma ...