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AD6641:  250 MHz Bandwidth DPD Observation Receiver

Product Details

Product Status:Recommended for New Designs

The AD6641 is a 250 MHz bandwidth digital predistortion observation receiver that integrates a 12-bit 500 MSPS ADC, a 16k × 12 FIFO, and a multimode back end that allows users to retrieve the data through a serial port (SPORT), the SPI interface, or a 12-bit parallel CMOS or 6-bit DDR LVDS port after being stored in the integrated FIFO memory. It is optimized for outstanding dynamic performance and low power consumption and is suitable for use in telecommunications applications such as a digital predistortion observation path where wider bandwidths are desired. All necessary functions, including the sample-and-hold, and voltage reference are included on the chip to provide a complete signal conversion solution.

The on-chip FIFO allows for small snapshots of time to be captured via the ADC and read back at a lower rate. This reduces the constraints of signal processing by transferring the captured data at an arbitrary time and at a much lower sample rate. The FIFO can be operated in several user programmable modes. In the single capture mode, the ADC data is captured when signaled via the SPI port or the use of the external FILL± pins. In the continuous capture mode, the data is loaded constantly into the FIFO and the FILL± pins are used to stop this operation.


  • Wireless and wired broadband communications
  • Communications test equipment
  • Power amplifier linearization


  • SNR = 65.8 dBFS at fIN up to 250MHz at 500 MSPS
  • ENOB of 10.5 at fIN up to 250 MHz at 500 MSPS (−1.0 dBFS)
  • SFDR = 80 dBc at fIN up to 250 MHz at 500 MSPS (−1.0 dBFS)
  • Excellent linearity
    -- DNL = ±0.5 LSB typical,
    INL = ±0.6 LSB typical
  • Integrated 16k × 12 FIFO
  • FIFO readback options
    -- 12-bit CMOS at 62.5MHz
    -- 6-bit DDR LVDS interface
    -- SPORT at 62.5 MHz
    -- SPI at 25MHz
  • High speed synchronization capability
  • 1 GHz full power analog bandwidth
  • Integrated input buffer
  • On-chip reference, no external decoupling required

Functional Block Diagram for AD6641

Sample Availability

This product is released to manufacturing. Please contact the High Speed Converters Development Group for sample availability and additional technical information.


Title Content Type File Type
AD6641: 250 MHz Bandwidth DPD Observation Receiver (Rev 0, 04/2011) (pdf, 646 kB) Data Sheets PDF
AN-1142: Techniques for High Speed ADC PCB Layout  (pdf, 392 kB) Application Notes PDF
AN-878: High Speed ADC SPI Control Software  (pdf, 585 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-827: A Resonant Approach to Interfacing Amplifiers to Switched-Capacitor ADCs  (pdf, 203 kB) Application Notes PDF
AN-877: Interfacing to High Speed ADCs via SPI  (pdf, 1594 kB) 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-812:  MicroController-Based Serial Port Interface (SPI) Boot Circuit (pdf, 452,449 bytes)  (pdf, 441 kB)
This application note describes the operation of a general-purpose, microcontroller-based Serial Port Interface (SPI) boot circuit.
Application Notes PDF
AN-742: Frequency Domain Response of Switched-Capacitor ADCs  (pdf, 401 kB) Application Notes PDF
AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter  (pdf, 291 kB) Application Notes PDF
UG-292: Evaluating the AD6641 DPD Observation Receiver  (pdf, 1635 kB) User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
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
AD6641 IBIS Model 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 AD6641
  • For differential RF/IF, we recommend the ultra low distortion ADL5562.
  • For a fully differential input and output DVGA in digital communications systems, we recommend the ADL5202 or the AD8376.
Recommended Clock Drivers for the AD6641
  • For low jitter performance and integrated VCO, we recommend the AD9520-0 and AD9522-0.
  • For low jitter performance along with on chip PLL and VCO, we recommend the AD9523 and AD9524.
Recommended Power Solutions

  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD6641 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD6641BCPZ-500 Status: Production 56 ld LFCSP (8x8mm) 56 Ind Tray, 260 $147.00 $124.95 Y  Material Info Notify Me Purchase
AD6641BCPZRL7-500 Status: Production 56 ld LFCSP (8x8mm) 56 Ind Reel, 750 $147.00 $124.95 Y  Material Info Notify Me 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.

AD6641 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD6641-500EBZ Status: Production Evaluation Board $300.00 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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