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AD9267 Dataheets PDF



Part Number AD9267
Manufacturers Analog Devices
Logo Analog Devices
Description 640 MSPS Dual Continuous Time Sigma-Delta Modulator
Datasheet AD9267 DatasheetAD9267 Datasheet (PDF)

10 MHz Bandwidth, 640 MSPS Dual Continuous Time Sigma-Delta Modulator AD9267 FEATURES 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 On-chip PLL clock multiplier On-chip voltage reference Twos complement data format 640 MSPS, 4-bit LVDS data output Serial control interface (SPI) FUNCTIONAL BLOCK DIAGRAM AVDD PDWNB PDWNA DRVDD OR±A VIN+A VIN–A LVDS DR.

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10 MHz Bandwidth, 640 MSPS Dual Continuous Time Sigma-Delta Modulator AD9267 FEATURES 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 On-chip PLL clock multiplier On-chip voltage reference Twos complement data format 640 MSPS, 4-bit LVDS data output Serial control interface (SPI) FUNCTIONAL BLOCK DIAGRAM AVDD PDWNB PDWNA DRVDD OR±A VIN+A VIN–A LVDS DRIVERS Σ -Δ MODULATOR D3±A D0±A PLL_LOCKED PLLMULT4 PLLMULT3 PLLMULT2 CLK+ CLK– DCO± AD9267 VREF CFILT VIN–B VIN+B Σ -Δ MODULATOR PHASELOCKED LOOP LVDS DRIVERS D3±B D0±B OR±B 07773-001 APPLICATIONS Baseband quadrature receivers: CDMA2000, W-CDMA, multicarrier GSM/EDGE, 802.16x, and LTE Quadrature sampling instrumentation SERIAL INTERFACE AGND SDIO/ PLLMULT1 SCLK/ PLLMULT0 CSB DGND GENERAL DESCRIPTION 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 continuous 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. Figure 1. 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. 2. 3. Continuous time Σ-Δ architecture efficiently achieves high dynamic range and wide bandwidth. Passive input structure reduces or eliminates the requirements for a driver amplifier. An oversampling ratio of 32× and high order loop filter provide excellent alias rejection, reducing or eliminating the need for antialiasing filters. Operates from a single 1.8 V power supply. A standard serial port interface (SPI) supports various product features and functions. Features a low pin count, high speed LVDS interface with data output clock. 4. 5. 6. www.DataSheet4U.com Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. AD9267 TABLE OF CONTENTS Features .............................................................................................. 1  Applications ....................................................................................... 1  General Description ......................................................................... 1  Functional Block Diagram .............................................................. 1  Product Highlights ........................................................................... 1  Revision History ............................................................................... 2  Specifications..................................................................................... 3  DC Specifications ......................................................................... 3  AC Specifications.......................................................................... 4  Digital Specifications ................................................................... 5  Switching Specifications .............................................................. 6  Absolute Maximum Ratings............................................................ 7  Thermal Resistance ................................................................


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