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AD6672-250EBZ датащи(PDF) 1 Page - Analog Devices |
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AD6672-250EBZ датащи(HTML) 1 Page - Analog Devices |
1 / 32 page IF Receiver AD6672 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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. FEATURES Performance with NSR enabled SNR: 75.2 dBFS in a 55 MHz band to 185 MHz at 250 MSPS SNR: 72.8 dBFS in an 82 MHz band to 185 MHz at 250 MSPS Performance with NSR disabled SNR: 66.4 dBFS up to 185 MHz at 250 MSPS SFDR: 87 dBc up to 185 MHz at 250 MSPS Total power consumption: 358 mW at 250 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 350 MHz bandwidth Serial port control Energy saving power-down modes User-configurable, built-in self test (BIST) capability 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 FUNCTIONAL BLOCK DIAGRAM 1-TO-8 CLOCK DIVIDER SERIAL PORT REFERENCE PIPELINE ADC AVDD SCLK SDIO CSB CLK+ CLK– AGND DRVDD VIN+ VIN– VCM DCO± 0/D0± D9±/D10± OR± AD6672 11 14 NOISE SHAPING REQUANTIZER Figure 1. GENERAL DESCRIPTION The AD6672 is an 11-bit intermediate receiver with sampling speeds of up to 250 MSPS. The AD6672 is designed to support communications applications, where low cost, small size, wide bandwidth, and versatility are desired. The ADC core features a multistage, differential pipelined architecture with integrated output error correction logic. The ADC features wide bandwidth inputs supporting a variety of user-selectable input ranges. An integrated voltage reference eases design considerations. A duty cycle stabilizer is provided to compensate for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance. The ADC core output is connected internally to a noise shaping requantizer (NSR) block. The device supports two output modes that are selectable via the serial port interface (SPI). With the NSR feature enabled, the outputs of the ADCs are processed such that the AD6672 supports enhanced SNR performance within a limited region of the Nyquist bandwidth while maintaining an 11-bit output resolution. The NSR block is programmed to provide a bandwidth of up to 33% of the sample clock. For example, with a sample clock rate of 250 MSPS, the AD6672 can achieve up to 73.6 dBFS SNR for an 82 MHz bandwidth at 185 MHz fIN. With the NSR block disabled, the ADC data is provided directly to the output with an output resolution of 11 bits. The AD6672 can achieve up to 66.6 dBFS SNR for the entire Nyquist bandwidth when operated in this mode. |
Аналогичный номер детали - AD6672-250EBZ |
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Аналогичное описание - AD6672-250EBZ |
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