Maker : Analog Devices
Part No. : AD6643

  Datasheet PDF : AD6643.pdf
  Cross Reference : AD6643 Cross Reference
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Shortcut : AD664  AD6640  AD6640AST  AD6640PCB  AD6640ST  AD6640ST/PCB  AD6641  AD6642  AD6643  AD6644  AD6644AST-40  AD6644AST-65  AD6644PCB  AD6644ST  AD6644ST/PCB  AD6645  AD6645/PCB  AD6645ASQ-80  AD6645PCB  AD6649  AD664AD-BIP  AD664AD-UNI  AD664AJ  AD664BD-BIP  AD664BD-UNI  AD664BE  AD664BJ  AD664JN-BIP  AD664JN-UNI  AD664JP  AD664KN-BIP  AD664KN-UNI  AD664KP  AD664SD-BIP  AD664SD-UNI  AD664TD-BIP  AD664TD-UNI 

Product Information

www.DataSheet4U.net Dual IF Receiver AD6643 FEATURES Performance with NSR enabled SNR: 76.1 dBFS in a 40 MHz band to 90 MHz at 185 MSPS SNR: 73.6 dBFS in a 60 MHz band to 90 MHz at 185 MSPS Performance with NSR disabled SNR: 66.5 dBFS up to 90 MHz at 185 MSPS SFDR: 88 dBc up to 185 MHz at 185 MSPS Total power consumption: 706 mW at 200 MSPS 1.8 V supply voltages LVDS (ANSI-644 levels) outputs Integer 1-to-8 input clock divider (625 MHz maximum input) Internal ADC voltage reference Flexible analog input range 1.4 V p-p to 2.0 V p-p (1.75 V p-p nominal) Differential analog inputs with 400 MHz bandwidth 95 dB channel isolation/crosstalk Serial port control Energy saving power-down modes User-configurable, built-in self test (BIST) capability FUNCTIONAL BLOCK DIAGRAM AVDD AGND DRVDD AD6643 VIN+A VIN–A VCM VIN+B VIN–B PIPELINE ADC 14 NOISE SHAPING REQUANTIZER 11 PIPELINE ADC 14 NOISE SHAPING REQUANTIZER 11 DATA MULTIPLEXER AND LVDS DRIVERS DCO± D0± D10± OEB REFERENCE CLOCK DIVIDER SYNC PDWN SERIAL PORT SCLK SDIO CSB CLK+ CLK– NOTES 1. THE D0± TO D10± PINS REPRESENT BOTH THE CHANNEL A AND CHANNEL B LVDS OUTPUT DATA. Figure 1. APPLICATIONS Communications Diversity radio and smart antenna (MIMO) systems Multimode digital receivers (3G) WCDMA, LTE, CDMA2000 WiMAX, TD-SCDMA I/Q demodulation systems General-purpose software radios GENERAL DESCRIPTION The AD6643 is an 11-bit, 200 MSPS, dual-channel intermediate frequency (IF) receiver specifically designed to support multiantenna systems in telecommunication applications where high dynamic range performance, low power, and small size are desired. The device consists of two high performance analog-to-digital converters (ADCs) and noise shaping requantizer (NSR) digital blocks. Each ADC consists of a multistage, differential pipelined architecture with integrated output error correction logic, and each ADC features a wide bandwidth switched capacitor sampling network within the first stage of the differential pipeline. An integrated voltage reference eases design considerations. A duty cycle stabilizer (DCS) compensates for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance. Each ADC output is connected internally to an NSR block. The integrated NSR circuitry allows for improved SNR performance in a smaller frequency band within the Nyquist bandwidth. The device supports two different output modes selectable via the SPI. With the NSR feature enabled, the outputs of the ADCs are processed such that the AD6643 supports enhanced SNR performance within a limited portion of the Nyquist bandwidth while maintaining an 11-bit output resolution. The NSR block can be programmed to provide a bandwidth of either 22% or 33% of the sample clock. For example, with a sample clock rate of 185 MSPS, the AD6643 can achieve up to 75.5 dBFS SNR for a 40 MHz bandwidth in the 22% mode and up to 73.7 dBFS SNR for a 60 MHz bandwidth in the 33% mode. (continued on Page 3) 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 ©2011 Analog Devices, Inc. All rights reserved. 09638-001 AD6643 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ........................................................................

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