Successive approximation register (SAR) ADCs offer high resolution, excellent accuracy, and low power. Once a precision SAR ADC is selected, the system designer must determine the supporting circuitry required to achieve the best results. Three main areas to consider are the front end that interfaces the analog input signal to the ADC, the voltage reference, and the digital interface. This article will focus on the circuit requirements and trade-offs of the front-end design. For other useful information, including specific device and system information, refer to the data sheet and the references in this article. …
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