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AD6644:  14-Bit, 40 MSPS/65 MSPS Analog-to-Digital Converter

Product Details

The AD6644 is a high speed, high performance, monolithic 14-bit analog-to-digital converter (ADC). All necessary functions, including track-and-hold (TH) and reference are included on- chip to provide a complete conversion solution. The AD6644 provides CMOS-compatible digital outputs. It is the third generation in a wideband ADC family, preceded by the AD9042 (12-bit 41 MSPS) and the AD6640 (12-bit 65 MSPS, IF sampling).

Designed for multichannel, multimode receivers, the AD6644 is part of the Analog Devices, Inc. new SoftCell® transceiver chipset. The AD6644 achieves 100 dB multitone, spurious-free dynamic range (SFDR) through the Nyquist band. This break- through performance eases the burden placed on multimode digital receivers (software radios) which are typically limited by the ADC. Noise performance is exceptional; typical signal-to- noise ratio is 74 dB.

The AD6644 is also useful in single channel digital receivers designed for use in wide-channel bandwidth systems (CDMA, WCDMA). With oversampling, harmonics can be placed outside the analysis bandwidth. Oversampling also facilitates the use of decimation receivers (such as the AD6620), allowing the noise floor in the analysis bandwidth to be reduced. By replacing traditional analog filters with predictable digital components, modern receivers can be built using fewer RF components, resulting in decreased manufacturing costs, higher manufacturing yields, and improved reliability.

The AD6644 is built on the Analog Devices high speed complementary bipolar process (XFCB) and uses an innovative, multipass circuit architecture. Units are packaged in a 52-lead plastic low profile quad flat package (LQFP) specified from – 25°C to +85°C.

Product Highlights

  1. Guaranteed sample rate is 65 MSPS.
  2. Fully differential analog input stage.
  3. Digital outputs can be run on 3.3 V supply for easy interface to digital ASICs.
  4. Complete solution: reference and track-and-hold.
  5. Packaged in small, surface-mount, plastic, 52-lead LQFP.


  • Multichannel, multimode receivers
  • Single channel digital receivers
  • Antenna array processing
  • Communications instrumentation
  • Radar, infrared imaging
  • Instrumentation
  • Data Sheet, Rev. D, 8/07


    • 65 MSPS guaranteed sample rate
    • 40 MSPS version available
    • Sampling jitter < 300 fs
    • 100 dB multitone SFDR
    • 1.3 W power dissipation
    • Differential analog inputs
    • Pin compatible to AD6645
    • Twos complement digital output format
    • 3.3 V CMOS compatible
    • Data-ready for output latching

    Functional Block Diagram for AD6644

    Of Note ...

    To drive this ADC in DC-coupled applications, we suggest ADA4938-1. To drive this ADC in AC-coupled applications, we suggest AD8351 or AD8375.


    Title Content Type File Type
    AD6644: 14-Bit, 40 MSPS/65 MSPS Analog-to-Digital Converter Data Sheet  (Rev D, 08/2007) (pdf, 829 kB) Data Sheets PDF
    AN-1142: Techniques for High Speed ADC PCB Layout  (pdf, 392 kB) Application Notes PDF
    AN-282: Fundamentals of Sampled Data Systems  (pdf, 2131 kB) Application Notes PDF
    AN-737: How ADIsimADC Models an ADC  (pdf, 373 kB) Application Notes PDF
    AN-807: Multicarrier WCDMA Feasibility  (pdf, 969 kB) Application Notes PDF
    AN-808: Multicarrier CDMA2000 Feasibility  (pdf, 1535 kB)
    The goal of this application note is to determine the feasibility of implementing a multicarrier CDMA2000 transceiver and what the major subsystem performances must be.
    Application Notes PDF
    AN-905: VisualAnalog Converter Evaluation Tool Version 1.0 User Manual  (pdf, 2124 kB) Application Notes PDF
    AN-935: Designing an ADC Transformer-Coupled Front End  (pdf, 363 kB) Application Notes PDF
    AN-835: Understanding High Speed ADC Testing and Evaluation  (pdf, 985 kB) Application Notes PDF
    AN-586: LVDS Outputs for High Speed A/D Converters  (pdf, 207 kB)
    High Speed ADCs Uses LVDS (Low-Voltage Differential Signaling) to Minimize Performance Limitations In ADC Applications When Providing High Speed Data Output
    Application Notes PDF
    AN-715: A First Approach to IBIS Models: What They Are and How They Are Generated  (pdf, 370 kB) Application Notes PDF
    AN-345: Grounding for Low-and-High-Frequency Circuits  (pdf, 455 kB)
    Know Your Ground and Signal Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just Resistance....
    Application Notes PDF
    AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter  (pdf, 291 kB) Application Notes PDF
    AN-501: Aperture Uncertainty and ADC System Performance  (pdf, 227 kB)
    A Key Concern in IF Sampling is that of Aperture Uncertainty (Jitter)
    Application Notes PDF
    AN-302: 02: Exploit Digital Advantages in an SSB Receiver  (pdf, 417 kB) Application Notes PDF
    UG-173: High Speed ADC USB FIFO Evaluation Kit (HSC-ADC-EVALB-DCZ)  (pdf, 774 kB) User Guides PDF
    Ultrasound System Considerations and their Impact on Front-End Components  (pdf)
    (Analog Dialogue, Vol 36, No. 3)
    Analog Dialogue PDF
    MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
    Buffer Adapts Single-ended Signals for Differential Inputs
    by Randall Carver, Analog Devices (EDN Design Idea, 9/2/2004)
    Technical Articles HTML
    Soft Radio Runs into Hard Standards
    by Brad Brannon and Chris Cloninger, Analog Devices Inc.
    (EE Times, April 11, 2001)
    Technical Articles HTML
    DNL and Some of its Effects on Converter Performance
    ... by Brad Brannon, Analog Devices, Inc. (Wireless Design & Development, June 2001)
    Technical Articles HTML
    Redefining the Role of ADCs in Wireless  (pdf, 303 kB)
    by Brad Brannon and Chris Cloninger Analog Devices, Inc.
    ... An update on the performance required for modern digital wireless systems
    (Applied Microwave & Wireless, March 2001)
    Technical Articles PDF
    Proper Grounding Is Critical For High-Speed Systems
    ... by Walt Kester and James Bryant, Analog Devices, Inc. (Wireless Systems Design, May 2000)
    Technical Articles HTML
    Correlating High-Speed ADC Performance to Multicarrier 3G Requirements
    by Brad Brannon (RF Design, 6/1/2003)
    Technical Articles HTML
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Evaluation Kits & Symbols & Footprints

    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.

    SampleSample & Buy

    Price, packaging, availability

    AD6644 Model Options
    Model Package Pins Temp.
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    AD6644ASTZ-40 Status: Production 52 ld LQFP (10x10mm) 52 Ind Tray, 160 $39.97 $33.89 Y  Material Info PCN Purchase
    AD6644ASTZ-65 Status: Production 52 ld LQFP (10x10mm) 52 Ind Tray, 160 $53.66 $45.58 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.

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