The S3ADS2M12BGF22FDX is an ultra-compact and low power 12-bit SAR ADC IP with a sampling rate up to 2MS/s. The input signal sampling time is controlled externally, making this ADC extremely flexible and able to interface with multiple blocks with different output driving strengths. A calibration algorithm enhances the ADC performance. During calibration, analog inputs are kept in high impedance, therefore relaxing the requirements for the block driving the ADC.