Cirrus CS4207四进六出HD音频CODEC方案

Cirrus 公司的CS4207是集成了耳机放大器的低功耗四进六出HD音频CODEC,包括有192 kHz DAC, 96 kHz ADC, 192 kHz S/PDIF发送器和接收器,麦克风前置放大器和偏置电压以及中心接地耳机驱动器.本文介绍了CS4207主要特性,方框图, 台式系统和手持系统连接图, 差分到单端输出滤波器以及开发平台CDB4207方框图,电路图和PCB布局图.

CS4207: Low-power, 4-in / 6-out HD Audio CODEC with Headphone Amp

The CS4207 is a highly integrated multi-channel lowpower HD Audio CODEC featuring 192 kHz DACs, 96 kHz ADCs, 192 kHz S/PDIF Transmitters and Receiver, Microphone pre-amp and bias voltage, and a ground centered Headphone driver. Based on multi-bit,
delta-sigma modulation, it allows infinite sample rate adjustment between 32 kHz and 192 kHz. The ADC input path allows control of a number of features.

The microphone input path includes a selectable programmable-gain pre-amplifier stage and a low-noise MIC bias voltage supply. A PGA is available for line and microphone inputs and provides analog gain with soft ramp and zero cross transitions. The ADC also features an additional digital volume attenuator with soft ramp transitions.

The stereo headphone amplifier is powered from a separate internally generated positive supply, with an integrated charge pump providing a negative supply.
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