AD9901_15 Datasheet, PDF (1/8 Pages) Analog Devices – Ultrahigh Speed Phase/Frequency Discriminator

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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
LOW-
PASS
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, com-
bined 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 resis-
tor controls the output stage current range, permitting a reduc-
tion 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 dis-
criminators, 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
data sheet for specifications.
FUNCTIONAL BLOCK DIAGRAM
REFERENCE
INPUT
OSCILLATOR
INPUT
D
Q
REFERENCE
INPUT
FLIP-FLOP
Q
D
Q
OSCILLATOR
INPUT
FLIP-FLOP
Q
XOR
D
Q
REFERENCE
FREQUENCY
DISCRIMINATOR
FLIP-FLOP
R
Q
D
S
Q
OSCILLATOR
FREQUENCY
DISCRIMINATOR
FLIP-FLOP
Q
OUTPUT
OUTPUT
REV. B
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© Analog Devices, Inc., 1999