Features and Benefits

  • Multiple pins/software-programmable input ranges
    5 V (10 V p-p), +10 V (20 V p-p),
    ±5 V (20 V p-p), ±10 V (40 V p-p)
  • Pins or serial SPI®-compatible input ranges/mode selection
  • Throughput
    670 kSPS (warp mode)
    570 kSPS (normal mode);
    450 kSPS (impulse mode)
  • See datasheet for additional features

Product Details

The AD7634 is an 18-bit charge redistribution successive approximation register (SAR), architecture analog-to-digital converter (ADC) fabricated on Analog Devices, Inc.’s iCMOS high voltage process. The device is configured through hardware or via a dedicated write-only serial configuration port for input range and operating mode. The AD7634 contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. A falling edge on CNVST samples the fully differential analog inputs on IN+ and IN−. The AD7634 features four different analog input ranges and three different sampling modes. Operation is specified from −40°C to +85°C.


  • CT scanners
  • High dynamic data acquisition
  • Σ-Δ replacement
  • Spectrum analysis
  • Medical instruments
  • Instrumentation
  • Process controls

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Product Recommendations

AD7634 Companion Parts

Recommended Driver Amplifiers

  • For low noise, high frequency and +/ 12V supplies: AD8021, ADA4898-1, ADA4922-1.
  • For low noise, low frequency, low distortion and 12V supplies: ADA4841-1.
  • For low bias current, low frequency and +/-13V supplies: AD8610.
  • For low noise, low frequency, ultralow distortion and +/-18V supplies: AD8597, ADA4627-1.

Recommended External Voltage References

  • For low drift and high current output applications: ADR435.
  • For low drift and low noise applications: ADR445.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Sample & Buy

See our Ordering FAQs for answers to questions about online orders, payment options and more.


The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help


Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.