SLWU067D November 2009 – March 2022 ADS4122 , ADS4125 , ADS4126 , ADS4128 , ADS4129 , ADS4142 , ADS4145 , ADS4146 , ADS4149 , ADS41B25 , ADS41B29 , ADS41B49 , ADS58B18 , ADS58B19
Option 2 supplies power to the 1.8-V analog and digital rails of the ADC by using the TPS79618. The TPS79618 is a low-noise dropout regulator - the 1.5-V dropout voltage (3.3 V to 1.8 V) provides sufficient headroom for maximum PSRR and ADC performance. However, it comes at the expense of higher system power consumption.