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

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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. However, there are several reasons why a design would end up adding external resistors in front of the analog input. The following sections provide a theoretical explanation of the gain error expected, as a function of the resistor sizes, and different ways to minimize these errors.

Analog Devices, Inc.

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