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  2. A/D Converters (ADC)
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  5. AD7621

Alternative Parts


Features and Benefits

  • 16 Bits Resolution with No Missing Codes
  • On-board Low Drift Reference with Buffer and Temperature Sensor
  • 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
  • No Pipeline Delay ( SAR architecture )
  • Single 2.5 V Supply Operation
  • Power Dissipation: 70 mW Typ @ 3 MSPS With REF

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

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


  1. Fast Throughput.
    The AD7621 is a 3 MSPS, charge redistribution, 16-bit SAR ADC.
  2. Superior Linearity.
    The AD7621 has no missing 16-bit code.
  3. Internal Reference.
    The AD7621 has a 2.048 V internal reference with a typical drift of ±7 ppm/°C.
  4. Single-Supply Operation.
    The AD7621 operates from a 2.5 V single supply and typically dissipates 65 mW. In impulse mode, its power dissipation decreases with the throughput.
  5. Serial or Parallel Interface.
    Versatile parallel (16- or 8-bit bus) or 2-wire serial interface arrangement compatible with 2.5 V, 3.3 V, or 5 V logic.


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

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)

Tools & Simulations

IBIS Model

AD7621 IBIS Models

Product Recommendations

AD7621 Companion Parts

Recommended Driver Amplifiers

Recommended External Voltage References

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.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
AD7621ACPZ Material Declaration Reliability Data 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP)
AD7621ASTZ Material Declaration Reliability Data 48-Lead LQFP (7mm x 7mm)
AD7621ASTZRL Material Declaration Reliability Data 48-Lead LQFP (7mm x 7mm)
Wafer Fabrication Data

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Sample & Buy

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Buy Now Pricing

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List Pricing

(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

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