SAR and Delta-Sigma ADC Fundamentals


July 9, 2015

This video provides the viewer with a high-level comparison between two of the most common precision analog-to-digital converter (ADC) architectures: successive approximation register (SAR)  and delta-sigma.  Topics covered include sampling rate, resolution, accuracy, power consumption and cycle latency.  

PDFs for download

Additional information

About SAR ADCs: Precision SAR ADC sampling rates typically range between 1 kSPS to around 5 MSPS with resolutions up to 20 bits. Extremely low cycle latency enables very precise and deterministic sampling. SAR ADCs also usually have very low power consumption, making them suitable for use in battery-powered applications.

About delta-sigma ADCs: Precision delta-sigma ADCs typically have a greater range of resolution options when compared to SARs. Select delta-sigma ADCs are available with up to 32 bits of resolution, making the architecture very well suited for applications needing extremely high resolution.

More precision data converter resources:

  • Download TI’s popular Analog Engineer’s Pocket Reference for frequently used analog formulas and equations on a wide variety of precision signal chain topics – from analog-to-digital and digital-to-analog conversions to op amp bandwidth and stability and more.
  • Visit TI’s Data Converter Learning Center for more than 100 technical articles, blog posts and videos organized by topic, such as delta-sigma ADC basics, ADC noise analysis and filtering, and driving ADCs.
  • Search for solutions, get help, share knowledge and solve problems with fellow engineers and TI experts in the Precision Data Converters Forum on the TI E2E™ Community.
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