SAR ADC

SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of ADC that converts continuous analog signals into discrete digital values using a binary search algorithm. It operates by comparing the input voltage against a reference voltage through a series of approximations, typically using a DAC and comparator, to determine each bit of the digital output sequentially. This design offers a good balance of speed, resolution, and power efficiency, making it widely used in medium-speed applications like sensors, audio processing, and embedded systems.

Also known as: Successive Approximation ADC, SAR, SAR-ADC, Successive Approximation Register ADC, SAR Converter

Why learn SAR ADC?

Developers should learn SAR ADC when working on embedded systems, IoT devices, or sensor interfaces that require moderate sampling rates (e.g., up to a few MS/s) with resolutions of 8 to 16 bits, as it provides a cost-effective and low-power solution. It is particularly useful in applications such as data acquisition, medical instruments, and consumer electronics where precise analog signal conversion is needed without the high power consumption of faster ADCs like flash converters.

Learning Resources

• tutorial: Analog Devices SAR ADC Tutorial
• course: Texas Instruments SAR ADC Fundamentals
• docs: All About Circuits SAR ADC Guide
• video: YouTube: SAR ADC Explained
• docs: Embedded Systems Design with SAR ADC