JAJSHL9A June 2019 – January 2021 ADS125H01
PRODUCTION DATA
The ADC requires three analog power supplies (high-voltage supplies HV_AVDD and HV_AVSS, and a low-voltage supply AVDD) and a digital power supply (DVDD). The high-voltage analog power-supply configuration is either bipolar (±5 V to ±18 V) or unipolar (10 V to 36 V). The AVDD power supply is 5 V. The digital supply range is 2.7 V to 5.25 V. AVDD and DVDD can be tied together as long as the 5-V power supply is free from noise and glitches that can affect conversion results. An internal low-dropout regulator (LDO) powers the digital core from the DVDD power supply. DVDD sets the digital I/O voltage.
Voltage ripple produced by switch-mode power supplies can interfere with the ADC conversion accuracy. Use LDOs at the switching regulator output to reduce power-supply ripple.