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AD9267:  10 MHz Bandwidth, 640 MSPS Dual Continuous Time Sigma-Delta Modulator

Product Details

The AD9267 is a dual continuous time (CT) sigma-delta (Σ-Δ) modulator with -88 dBc of dynamic range over 10 MHz real or 20 MHz complex bandwidth. The combination of high dynamic range, wide bandwidth, and characteristics unique to the continuous time Σ-Δ modulator architecture makes the AD9267 an ideal solution for wireless communication systems.

The AD9267 has a resistive input impedance that significantly relaxes the requirements of the driver amplifier. In addition, a 32× oversampled fifth-order continuous time loop filter attenuates out-of-band signals and aliases, reducing the need for external filters at the input. The low noise figure of 15 dB relaxes the linearity requirements of the front-end signal chain components, and the high dynamic range reduces the need for an automatic gain control (AGC) loop.

A differential input clock controls all internal conversion cycles. An external clock input or the integrated integer-N PLL provides the 640 MHz internal clock needed for the oversampled conti- nuous time Σ-Δ modulator. The digital output data is presented as 4-bit, LVDS at 640 MSPS in twos complement format. A data clock output (DCO) is provided to ensure proper latch timing with receiving logic. Additional digital signal processing may be required on the 4-bit modulator output to remove the out-of-band noise and to reduce the sample rate.

The AD9267 operates on a 1.8 V power supply, consuming 416 mW. The AD9267 is available in a 64-lead LFCSP and is specified over the industrial temperature range (−40°C to +85°C).

Product Highlights

  1. Continuous time Σ-Δ architecture efficiently achieves high dynamic range and wide bandwidth.
  2. Passive input structure reduces or eliminates the require- ments for a driver amplifier.
  3. An oversampling ratio of 32× and high order loop filter provide excellent alias rejection, reducing or eliminating the need for antialiasing filters.
  4. Operates from a single 1.8 V power supply.
  5. A standard serial port interface (SPI) supports various product features and functions.
  6. Features a low pin count, high speed LVDS interface with data output clock.


  • Baseband quadrature receivers: CDMA2000, W-CDMA, multicarrier GSM/EDGE, 802.16x, and LTE
  • Quadrature sampling instrumentation


  • SNR: 83 dB (85 dBFS) to 10 MHz input
  • SFDR: −88 dBc to 10 MHz input
  • Noise figure: 15 dB
  • Input impedance: 1 kΩ
  • Power: 416 mW
  • 10 MHz real or 20 MHz complex bandwidth
  • 1.8 V analog supply operation
  • Please see data sheet for additional features

Functional Block Diagram for AD9267


Title Content Type File Type
AD9267: 10 MHz Bandwidth, 640 MSPS Dual Continuous Time Sigma-Delta Modulator Preliminary Data Sheet (Rev 0, 08/2009) (pdf, 93 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-282: Fundamentals of Sampled Data Systems  (pdf, 2131 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-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-835: Understanding High Speed ADC Testing and Evaluation  (pdf, 985 kB) 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-283: Sigma-Delta ADCs and DACs  (pdf, 1699 kB)
Overview of Sigma-Delta Concepts: Oversampling, Noise Shaping Using the Sigma-Delta Modulator, Digital Filtering and Decimation.
Application Notes PDF
UG-093: Evaluation Board User Guide for the Dual, Continuous Time Sigma-Delta Modulator  (pdf, 1449 kB) User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Understanding Continuous-Time, Discrete-Time Sigma-Delta ADCs And Nyquist ADCs
Due to the high performance, efficiency, and ease of use of the CT-ΣΔ architecture, manufacturers of high-performance analog-to-digital converters (ADCs) are now bringing this converter architecture to market as a standard product.
(Electronic Design, February 20, 2009)
Technical Articles HTML
AD926x Family 16-Bit, 10 MHz Bandwidth, Continuous-Time Sigma-Delta (CTSD) Analog-to-Digital Converters  (pdf, 1406 kB) Overview 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

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.

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Price, packaging, availability

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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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