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AD6645:  14-Bit, 80 MSPS/105 MSPS A/D Converter

Product Details

The AD6645 is a high speed, high performance, monolithic 14-bit analog-to-digital converter. All necessary functions, including track-and-hold (T/H) and reference, are included on the chip to provide a complete conversion solution. The AD6645 provides CMOS-compatible digital outputs. It is the fourth generation in a wideband ADC family, preceded by the AD9042 (12-bit, 41 MSPS), the AD6640 (12-bit, 65 MSPS, IF sampling), and the AD6644 (14-bit, 40 MSPS/65 MSPS).

Designed for multichannel, multimode receivers, the AD6645 is part of Analog Devices, Inc. SoftCell® transceiver chipset. The AD6645 maintains 100 dB multitone, spurious-free dynamic range (SFDR) through the second Nyquist band. This breakthrough performance eases the burden placed on multimode digital receivers (software radios) that are typically limited by the ADC. Noise performance is exceptional; typical signal-to-noise ratio is 74.5 dB through the first Nyquist band.

The AD6645 is built on Analog Devices' extra fast complementary bipolar (XFCB) process and uses an innovative, multipass circuit architecture. Units are available in a thermally enhanced 52-lead PowerQuad 4 (LQFP_PQ4) package specified from −40°C to +85°C at 80 MSPS and −10°C to +85°C at 105 MSPS.

Product Highlights

  1. IF Sampling. The AD6645 maintains outstanding ac performance up to input frequencies of 200 MHz, suitable for multicarrier 3G wideband cellular IF sampling receivers.
  2. Pin Compatibility. The ADC has the same footprint and pin layout as the AD6644 14-bit, 40 MSPS/65 MSPS ADC.
  3. SFDR Performance and Oversampling. Multitone SFDR performance of 100 dBFS can reduce the requirements of high end RF components and allows the use of receive signal processors such as the AD6620, AD6624/AD6624A, or AD6636.

  • Multichannel, multimode receivers
  • Base station infrastructure
  • Single channel digital receivers
  • Antenna array processing
  • Communications instrumentation
  • Radar, infrared imaging
  • Instrumentation


  • SNR = 75 dB, fIN 15 MHz, up to 105 MSPS
  • SNR = 72 dB, fIN200 MHz, up to 105 MSPS
  • SFDR = 89 dBc, fIN 70 MHz, up to 105 MSPS
  • 100 dBFS multitone SFDR
  • IF sampling to 200 MHz
  • Sampling jitter 0.1 ps
  • 1.5 W power dissipation
  • Differential analog inputs
  • Pin compatible to AD6644
  • Twos complement digital output format
  • 3.3 V CMOS compatible
  • DataReady for output latching

Functional Block Diagram for AD6645


Title Content Type File Type
AD6645: 14-Bit, 80 MSPS/105 MSPS A/D Converter Data Sheet  (Rev D, 10/2008) (pdf, 842 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
CN-0109: Low Jitter Sampling Clock Generator for High Performance ADCs Using the AD9958/AD9858 500 MSPS/1GSPS DDS and AD9515 Clock Distribution IC  (pdf, 114 kB) Circuit Note PDF
UG-173: High Speed ADC USB FIFO Evaluation Kit (HSC-ADC-EVALB-DCZ)  (pdf, 774 kB) User Guides PDF
MS-2735: Maximizing the Dynamic Range of Software-Defined Radio  (pdf, 351 kB) Technical Articles 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
Converters for 3G are Optimized for Cost, Size and Power
by Chris Cloninger, Analog Devices, Inc. (Planet Analog, 4/6/2006)
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
Bridging The Analog/ Digital Domain
by Cheryl Ajluni
(Wireless Systems Design, September 2001)
Technical Articles HTML
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
Analog-to-Digital Converter Clock Optimization: A Test Engineering Perspective
(Analog Dialogue, Vol. 42, February 2008)
Analog Dialogue HTML
Transformer-Coupled Front-End for Wideband A/D Converters
by Rob Reeder, Analog Devices, Inc. (Analog Dialogue, Vol 39, April 2005)
Analog Dialogue HTML
Pushing the State of the Art with Multichannel A/D Converters
by Rob Reeder, Mark Looney and Jim Hand, Analog Devices, Inc. (Analog Dialogue, Vol. 39, May 2005)
Analog Dialogue HTML
14-Bit Monolithic ADCs: First to Sample Faster than 1 MSPS
(Analog Dialogue, Vol. 31, No. 2, 1997)
Analog Dialogue HTML
Advanced Digital Post-Processing Techniques Enhance Performance in Time-Interleaved ADC Systems
by Mark Looney, Analog Devices, Inc. (Analog Dialogue, Vol. 37, June 2003)
Analog Dialogue HTML
Ultrasound Analog Electronics Primer
(Analog Dialogue, Vol. 33, No. 5, May, 1999)
Analog Dialogue HTML
ADC Input Noise: The Good, The Bad, and The Ugly. Is No Noise Good Noise? Analog Dialogue HTML
PCN#00-406  (pdf, 14 kB)
Product Change notice for change of Analog Devices, Inc. Aerospace Product Line standard product from 883 Class S to MIL-PRF-38535, level V.
Aerospace Information PDF
Aerospace Dice  (pdf, 196 kB)
(Revised 1/2006)
Many Analog Devices products can be purchased as Class K die.
Aerospace Information PDF
Standard Space Level Products Program  (pdf, 39 kB)
This brochure describes the standard flow and how to order Analog Devices, Inc. standard product for Space Level not available as JAN, or QML. It replaces the Standard Class S brochure.
Aerospace Information PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADIsimADC is Analog Devices' Analog-to-Digital Behavioral Model that accurately models the typical performance characteristics of many of our High Speed Converters. The model faithfully reproduces the errors associated with both static and dynamic features such as AC linearity, clock jitter, and many other product specific anomalies.
ADIsim Design/Simulation Tools HTML
AD6645 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

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Companion Products

Suggested Companion Products

Recommended ADC Drivers for the AD6645
  • In DC-coupled applications, we recommend the AD8138 or ADA4932-1 differential output amplifier.
Recommended Clock Drivers for the AD6645 Recommended Power Solutions

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Price, packaging, availability

AD6645 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD6645ASVZ-105 Status: Production 52 ld TQFP_EP(10x10 w/6.5ep) 52 Comm. Tray, 160 $66.67 $56.67 Y  Material Info PCN Purchase
AD6645ASVZ-80 Status: Production 52 ld TQFP_EP(10x10 w/6.5ep) 52 Comm. Tray, 160 $52.03 $44.22 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.

AD6645 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD6645-105/PCBZ Status: Production Evaluation Board $202.40 Yes -
AD6645-80/PCBZ Status: Obsolete Evaluation Board - Yes - Contact ADI

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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