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
