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AD7621:  16-Bit, 2 LSB INL, 3 MSPS PulSAR® ADC

Product Details

The AD7621 is a 16-bit, 3 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 16-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 (Wideband Warp) for undersampling applications and, for asynchronous conversion rate applications, a fast mode (Normal) and, for low power applications, a reduced power mode (Impulse) where the power is scaled with the throughput.

It is available in a 48-lead LQFP or a 48-lead LFCSP with operation specified from –40°C to +85°C.


  • Medical instruments
  • High speed data acquisition
  • Digital signal processing
  • Communications
  • Instrumentation
  • Spectrum analysis
  • ATE


  • 16 Bits Resolution with No Missing Codes
  • No Pipeline Delay ( SAR architecture )
  • Differential Input Range: ±VREF (VREF up to 2.5V)
  • Throughput:
    3 MSPS (Wideband Warp and Warp Mode)
    2 MSPS (Normal Mode)
    1.25 MSPS (Impulse Mode)
  • INL ±2 LSB Max (±30 ppm of FS)
  • SINAD: 89 dB Typ @ 100 kHz
  • THD: -103 dB Typ @ 100 kHz
  • Parallel (16 or 8 bits bus) and 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
  • Single 2.5 V Supply Operation
  • Power Dissipation: 70 mW Typ @ 3 MSPS With REF

Functional Block Diagram for AD7621


Title Content Type File Type
AD7621: 16-Bit, 2 LSB INL, 3 MSPS PulSAR™ ADC Data Sheet (Rev 0, 05/2005) (pdf, 612 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
Digital X-Ray Technology Improves Patient Experience and Physician Diagnostics Technical Articles HTML
Which ADC Architecture Is Right for Your Application?
by Walt Kester, Analog Devices, Inc. (Analog Dialogue, Vol 39, June 2005)
Analog Dialogue HTML
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

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7621 IBIS Models IBIS Models 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 AD7621

  • 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 AD7621
  • 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

AD7621 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7621ACPRL Status: Obsolete 48 ld LFCSP 7x7mm (5.25EP) 48 Ind Reel, 2500 - - N  Material Info PDN Contact ADI
AD7621ACPZ Status: Production 48 ld LFCSP 7x7mm (5.25EP) 48 Ind Tray, 260 $33.53 $30.31 Y  Material Info Notify Me Purchase Sample
AD7621ACPZRL Status: Production 48 ld LFCSP 7x7mm (5.25EP) 48 Ind Reel, 2500 - $30.31 Y  Material Info Notify Me Purchase
AD7621ASTZ Status: Production LQFP 1.4 MM 48 Ind Tray, 250 $33.53 $30.31 Y  Material Info Notify Me Purchase Sample
AD7621ASTZRL Status: Production 48 ld LQFP 48 Ind Reel, 2000 - $30.31 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.

AD7621 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-AD7621EDZ Status: Production Evaluation Board $99.00 Yes -
EVAL-CED1Z Status: Production Evaluation Controller 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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