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AD9874EB Datasheet(PDF) 2 Page - Analog Devices

Part # AD9874EB
Description  IF Digitizing Subsystem
PDF  40 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9874EB Datasheet(HTML) 2 Page - Analog Devices

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REV. A
AD9874
–2–
TABLE OF CONTENTS
AD9874—SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 3
ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . 5
PIN CONFIGURATION/DESCRIPTION . . . . . . . . . . . . . 6
DEFINITION OF SPECIFICATIONS/
TEST METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
TYPICAL PERFORMANCE CHARACTERISTICS . . . . . 8
SERIAL PERIPHERAL INTERFACE (SPI) . . . . . . . . . . . 13
SYNCHRONOUS SERIAL INTERFACE (SSI) . . . . . . . . 16
Synchronization Using SYNCB . . . . . . . . . . . . . . . . . . . . 18
Interfacing to DSPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
POWER CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
LO SYNTHESIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Fast Acquire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
CLOCK SYNTHESIZER . . . . . . . . . . . . . . . . . . . . . . . . . . 21
IF LNA/MIXER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
BAND-PASS SIGMA DELTA ( - ) ADC . . . . . . . . . . . . 24
DECIMATION FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . 26
VARIABLE GAIN AMPLIFIER WITH AGC . . . . . . . . . . 28
Variable Gain Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Automatic Gain Control . . . . . . . . . . . . . . . . . . . . . . . . . 29
System NF vs. VGA Control . . . . . . . . . . . . . . . . . . . . . . 31
APPLICATION CONSIDERATIONS . . . . . . . . . . . . . . . 32
Frequency Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Spurious Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
EXTERNAL PASSIVE COMPONENT
REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Superheterodyne Receiver . . . . . . . . . . . . . . . . . . . . . . . . 34
Synchronization of Multiple AD9874s . . . . . . . . . . . . . . . 36
Split Path Rx Architecture . . . . . . . . . . . . . . . . . . . . . . . . 37
Hung Mixer Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
LAYOUT EXAMPLE
EVALUATION BOARD AND SOFTWARE . . . . . . . . . 38
OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . 39
REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40



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