The CS4207 is a highly integrated multi-channel low power HD audio codec featuring 192kHz DACs, 96kHz ADCs, 192kHz S/PDIF transmitter and receiver, microphone preamp and bias voltage and a ground centered headphone driver. Based on multi-bit, Delta Sigma modulation, it allows infinite sample rate adjustment between 32kHz and 192kHz. 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 GA 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.