[原创] TI PCM186x系列音频前端子系统解决方案

TI公司的PCM186x系列是音频前端器件,不需要5V电源或外接可编增益放大器,和欧洲Ecodesign法规兼容,集成了可替代某些DSP功能的许多系统级的功能,从而能以降低成本方式实现更小更智能的产品,采用3.3V电源,主要用在汽车,家庭影院,网络照相机和音响中的音频子系统.本文介绍了PCM186x系列主要特性,内部框图以及评估板PCM1865EVM主要特性,框图,电路图,材料清单和PCB元件布局图.

The PCM186x family of audio front-end devices takes a new approach to audio-function integration to ease compliance with European Ecodesign legislation while enabling high-performance end products. With no need for a 5-volt supply or an external programmable-gain amplifier, smaller, smarter products are feasible at reduced cost.

The PCM186x’s highly flexible audio front end supports input levels from small-mV microphone inputs to 2.1VRMS line Inputs without external resistor dividers. The PCM186x family integrates many system-level functions that assist or replace some DSP functions.

All these features are available using a single 3.3V power supply. An integrated bandgap voltage reference provides excellent PSRR, so that a dedicated analog 3.3V rail may not be required.

PCM186x系列主要特性:

Universal Analog Mic Input, 2.1VRMS Full Scale
8 Analog Inputs with MUX and PGA
Analog pre-mix function before PGA/MUX..

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