Industry White Paper

The On-Chip Calibration Benefits of New Simultaneous SAR Analog-to-Digital Converters

January 06, 2023 by Analog Devices
Topics Covered
  • When to Use External Front-End Resistors
  • Errors Introduced by External Resistors
  • Back-End vs. On-Chip Calibration
  • Impact of the Input Impedance

Technical Article Overview

This article evaluates the impact of external resistors used in front of resistive analog-to-digital converters (ADCs). These families of simultaneous sampling ADCs include a high input impedance resistive programmable gain amplifier (PGA) that drives the ADC and scales the input signal, allowing direct sensor interface.

This article also examines:

  • resistor tolerance
  • ADC’s input impedance effects of the different calibration options