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AD7641:  18-Bit, 2 MSPS SAR ADC

Product Details

The AD7641 is a 18-bit, 2 MSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates from a single 2.5 V power supply. The part contains a high-speed 18-bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports. It features a very high sampling rate mode (Warp) and a fast mode (Normal) for asynchronous conversion rate applications.

The AD7641 is hardware factory calibrated and comprehensively tested to ensure ac parameters such as signal-to-noise ratio (SNR) and total harmonic distortion (THD) in addition to the more traditional dc parameters of gain, offset and linearity.

Operation is specified from −40°C to +85°C.


  • Medical instruments
  • High dynamic data acquisition
  • Instrumentation
  • Spectrum analysis
  • ATE


  • 18-bit resolution with no missing codes
  • 2.5 V internal low drift reference
  • Throughput:
    2 MSPS (Warp mode)
    1.5 MSPS (Normal mode)
  • Differential input range: ± VREF
    (VREF up to 2.5 V)
  • INL: ±2 LSB typical
  • No pipeline delay ( SAR architecture )
  • Parallel (18-, 16-, or 8-bit bus)
  • Serial 5 V/3.3 V/2.5 V interface
  • SPI®/QSPI™/MICROWIRE™/DSP compatible
  • On-board low drift reference with buffer and temperature sensor

Functional Block Diagram for AD7641


Title Content Type File Type
AD7641: 18-Bit, 2 MSPS SAR ADC Data Sheet  (Rev 0, 01/2006) (pdf, 666 kB) Data Sheets PDF
AN-931: Understanding PulSAR ADC Support Circuitry  (pdf, 299 kB)
This application note discusses in general the pitfalls that occur regularly when using SAR ADCs and, more importantly, how to easily prevent them.
Application Notes PDF
AN-932: Power Supply Sequencing  (pdf, 95 kB) Application Notes PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Which ADC Architecture Is Right for Your Application?
by Walt Kester, Analog Devices, Inc. (Analog Dialogue, Vol 39, June 2005)
Analog Dialogue HTML
Two Fast, Two Accurate A/D Converters Help Eliminate Front-end Conditioning
(eeProductCenter Reviews. 6/28/04)
Product Reviews HTML
18-Bit SAR, 20-Bit Delta-Sigma ADCs Up The Ante On Converter Specs
(ED Online, 8/9/2004)
Product Reviews HTML
New 18- and 24-bit ADCs reduce design complexity, time, and cost.  (pdf, 617 kB)
(Downloadable PDF)
Overview PDF
8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog  (pdf, 1885 kB)
8- to 18-Bit SAR ADCs with Sample Rates up to 3 MSPS -- The latest additions to ADI’s ADC portfolio offer unrivaled functionality in terms of channel count and power supply voltage, optimal power/speed ratios, and the smallest packages to meet the demands of any data acquisition application, including portable, industrial, medical, wireless, and communications.
Overview PDF
High Speed, High Accuracy 14-Bit, 16-Bit, and 18-Bit PulSAR ADCs  (pdf, 3826 kB)
A PulSAR Family Brochure (6/2006)
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended Driver Amplifiers for the AD7641

  • For low bias current, low frequency, we recommend the ADA4627.
  • For single-ended to differential driver applications, we recommend AD8139 or the ADA4930-1.
  • For a fully differential attenuating precision amplifier, we recommend the AD8475.
  • For low noise, low distortion, low power, we recommend the ADA4841-1.
Recommended External Voltage References for the AD7641
  • For low power, we suggest the ADR291.
  • For lowest cost, we suggest the AD1582.
  • For external reference buffer, we recommend the AD8031 or the AD8032.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7641 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7641BCPZ Status: Production 48 ld LFCSP 7x7mm (5.25EP) 48 Ind Tray, 260 $32.44 $29.33 Y  Material Info Notify Me Purchase Sample
AD7641BCPZRL Status: Production 48 ld LFCSP 7x7mm (5.25EP) 48 Ind Reel, 2500 - $29.33 Y  Material Info Notify Me Purchase
AD7641BSTZ Status: Production 48 ld LQFP 48 Ind Tray, 250 $32.44 $29.33 Y  Material Info PCN Purchase Sample
AD7641BSTZRL Status: Production 48 ld LQFP 48 Ind Reel, 2000 - $29.33 Y  Material Info PCN Purchase
Price Table Help

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.

AD7641 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-AD7641EDZ Status: Production AD7641 Evaluation Board $151.80 Yes -
EVAL-CED1Z Status: Production Converter Evaluation and Development Board $249.00 Yes -

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.

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