
a
CMOS 300 MHz
Complete-DDS Synthesizer
PRODUCT CONCEPT
AD9852
ADI Proprietary and Confidential
FEATURES
300 MHz Internal Clock Rate
On-chip 12-bit DAC
& High-speed Comparator
Excellent Dynamic Performance:
84 dB SFDR @ 100 MHz (
±
1 MHz) Aout
4-20X PLL Reference Clock Multiplier
32-bit Frequency/14-bit Phase Tuning Words
Two Programmable Frequency/Phase
Registers
FMChirp Function
SIN X/X Correction
Simplified Control Interface: Serial & Parallel
+3 V Single Supply
Low Power: 500 mW @ 300 MHz
Power-down Function
Ultra-Small 44-pin TQFP Packaging
APPLICATIONS
Agile L.O. Frequency Synthesis in Amateur
Radio Tuners
Cellular/DCS/GSMBasestation
Programmable Clock Generator
FMChirp Source for Acousto-optic Laser
Scanning System
Master
Reset
Frequency
Update/
Data Register
Reset
300 MHz DDS
MPU Interface
+V
GND
8-bit Byte
Parallel
32-bit
Word
Frequency/Phase Data Registers
Word
Load
Clock
Ref
Clock
I
n
Control Words
VINP
VINN
Qout
Qout
12-
bit
Analog
Out
DAC
Rset
4-20X
PLL
Inverse
Sinc
Filter
Comparator
-
+
Analog
Out
1-bit
Serial
Serial
Load
Chirp
Control
Freq
Select
Register
Address
Phase
Select
Frequency, Phase, and Control Data
AD9852 FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The AD9852 digital synthesizer is a highly integrated device that
uses advanced DDS technology, coupled with an internal high-
speed, high performance D/A converter and comparator to form a
digitally-programmable synthesizer function.When referenced to
an accurate clock source, the AD9852 generates a highly stable,
frequency/phase-programmable output sinewave that can be used
as an agile L.O. in communications, radar, and many other
applications. The AD9852's innovative high-speed DDS core
provides a 32-bit frequency tuning word, which results in an
output tuning resolution of .07 Hz, for a 300 MHz internal
reference clock input. The AD9852's circuit architecture allows
the generation of an output sinewave at up to one-third the clock
frequency, or 100 MHz, which can be digitally changed up to a
rate of 25 million new frequencies per second. The device also
provides 14-bits of digitally-controlled phase modulation.
The on-board 12-bit DAC, coupled with the innovative DDS
architecture, provides excellent output wideband and narrowband
SFDR. The AD9852’s programmable 4-20X reference clock PLL
generates the 300 MHz clock internally, from an external
reference clock. This saves the user the expense and difficulty of
implementing a 300 MHz clock source. The AD9850 uses
advanced CMOS technology to provide this high level of
functionality on <500 mW of power dissipation, at a maximum
internal clock rate of 300 MHz.
The AD9852 is available in a space-saving 44-pin TQFP surface
mount package. It is specified to operate over the extended
industrial temperature range of -40° to +85°C.
Information furnished by Analog Devices is believed to be accurate
and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights
of third parties which may result from its use. No license is granted by
implication or otherwise under any patent or patent rights of Analog
Devices.
One Technology Way; P.O. Box 9106; Norwood, MA 02062-9106
Tel: 617/329-4700
West Coast
Central
714/641-9391
214/231-5094
TWX: 710/394-6577
Atlantic
215/643-7790
2/17/98