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AD9901

Part Number	AD9901
Manufacturer	Analog Devices
Description	Ultrahigh Speed Phase/Frequency Discriminator
Published	Mar 24, 2005
Detailed Description	a FEATURES Phase and Frequency Detection ECL/TTL/CMOS Compatible Linear Transfer Function No “Dead Zone” MIL-STD-883 Com...
Datasheet	AD9901 PDF File

Overview

a FEATURES Phase and Frequency Detection ECL/TTL/CMOS Compatible Linear Transfer Function No “Dead Zone” MIL-STD-883 Compliant Versions Available APPLICATIONS Low Phase Noise Reference Loops Fast-Tuning “Agile” IF Loops Secure “Hopping” Communications Coherent Radar Transmitter/Receiver Chains Ultrahigh Speed Phase/Frequency Discriminator AD9901 PHASE-LOCKED LOOP REFERENCE INPUT AD9901 LOWPASS FILTER VCO OSCILLATOR OUTPUT 1/N OPTIONAL 1/N PRESCALER TYPICAL OF DIGITAL PLLs GENERAL DESCRIPTION The AD9901 is a digital phase/frequency discriminator capable of directly comparing phase/frequency inputs up to 200 MHz.
Processing in a high speed trench-oxide isolated process, combined with an innovative design, gives the AD9901 a linear detection range, free of indeterminate phase detection zones common to other digital designs.
With a single +5 V supply, the AD9901 can be configured to operate with TTL or CMOS logic levels; it can also operate with ECL inputs when operated with a –5.
2 V supply.
The open-collector outputs allow the output swing to be matched to post-filtering input requirements.
A simple current setting resistor controls the output stage current range, permitting a reduction in power when operated at lower frequencies.
A major feature of the AD9901 is its ability to compare phase/frequency inputs at standard IF frequencies without prescalers.
Excessive phase uncertainty which is common with standard PLL configurations is also eliminated.
The AD9901 provides the locking speed of traditional phase/frequency discriminators, with the phase stability of analog mixers.
The AD9901 is available as a commercial temperature range device, 0°C to +70°C, and as a military temperature device, –55°C to +125°C.
The commercial versions are packaged in a 14-lead ceramic DIP and a 20-lead PLCC.
The AD9901 Phase/Frequency Discriminator is available in versions compliant with MIL-STD-883.
Refer to the Analog Devices Military Products Databook or current AD9901/883B da...

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