This analog-to-digital converter (ADC) is devised to replace sigma-delta ADC in audio codec. It has a two-channel SAR ADC, with multi-input PGA and bandgap. The multi inputs refer to Microphone in, FM in and Line in. All inputs have 24 dB gain in 16 steps. But for microphone in, it has additional 20dB gain boost.

Process: SMIC 0.18um logic process 1Poly 5Metal  
Resolution: 12-bit resolution  
DNL: +/-1 LSB, INL: +/-1.5 LSB  
SNR: < 67dB  
THD: TBD  
Analog supply: 2.7-3.6V; Digital supply: 1.8V  
Single-ended analog input  
Data rates: < 200KSPS  
Power down mode: < 1uA  
PGA: 0~ 44 dB, 0/20dB gain boost, 0~24dB PGA, 1.6dB steps