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AD6672-250EBZ датащи(PDF) 1 Page - Analog Devices

номер детали AD6672-250EBZ
подробное описание детали  IF Receiver
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домашняя страница  http://www.analog.com
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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.


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