CMOS 300 MHz
Complete-DDS
a
AD9852
FEATURES
300 MHz Internal Clock Rate
Integrated 12-Bit Output DACs
3.3 V Single Supply
Multiple Power-Down Functions
Single-Ended or Differential Input Reference Clock
Small 80-Lead LQFP Packaging
Ultrahigh-Speed, 3 ps RMS Jitter Comparator
Excellent Dynamic Performance: 80 dB SFDR @ 100 MHz
(؎1 MHz) AOUT
4؋
to 20؋
Programmable Reference Clock Multiplier
Dual 48-Bit Programmable Frequency Registers
Dual 14-Bit Programmable Phase Offset Registers
12-Bit Amplitude Modulation and Programmable
Shaped On/Off Keying Function
APPLICATIONS
Agile, L.O. Frequency Synthesis
Programmable Clock Generator
FM Chirp Source for Radar and Scanning Systems
Test and Measurement Equipment
Commercial and Amateur RF Exciter
Single Pin FSK and PSK Data Interface
Linear or Nonlinear FM Chirp Functions with Single
Pin Frequency “Hold” Function
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 converters and a comparator
to form a digitally-programmable agile synthesizer function. When
referenced to an accurate clock source, the AD9852 generates a
highly stable, frequency-phase amplitude-programmable sine
wave output 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 48-bit frequency resolution
(1 microHertz tuning steps). Phase truncation to 17 bits assures
Frequency-Ramped FSK
<25 ps RMS Total Jitter in Clock Generator Mode
Automatic Bidirectional Frequency Sweeping
SIN(x)/x Correction
Simplified Control Interface
10 MHz Serial, 2-Wire or 3-Wire SPI-Compatible or
100 MHz Parallel 8-Bit Programming
excellent SFDR. The AD9852’s circuit architecture allows the
(continued on page 13)
FUNCTIONAL BLOCK DIAGRAM
300MHz
DDS
DIGITAL
MULTIPLIER
DIFF/SINGLE
SELECT
INV.
SINC
FILTER
12-BIT DDS
DAC
I
ANALOG OUT
12
REF CLK
MULTI-
REFERENCE
CLOCK IN
12
DAC R
SET
PLEXER
RAMP-UP/-DOWN
CLOCK/LOGIC
AND
Q
PHASE/OFFSET
MODULATION
12-BIT
DATA
12-BIT CONTROL
DAC
MULTIPLEXER
ANALOG OUT
AD9852
FSK/BPSK/HOLD
DATA IN
FREQUENCY TUNING WORD/PHASE WORD
MULTIPLEXER AND RAMP START STOP LOGIC
SHAPED
ON/OFF KEYING
12
AMPLITUDE
MODULATION
DATA
48-BIT
FREQUENCY
TUNING WORD
14-BIT PHASE
OFFSET/
MODULATION
ANALOG IN
BIDIRECTIONAL
I/O UPDATE
PROGRAMMING REGISTERS
READ
CLOCK OUT
PROGRAMMABLE RATE
AND UPDATE CLOCKS
I/O PORT BUFFERS
WRITE
COMPARATOR
MASTER
RESET
+V
GND
SERIAL/PARALLEL
SELECT
S
6-BIT ADDRESS
OR SERIAL
8-BIT PARALLEL
LOAD
PROGRAMMING
LINES
REV. 0
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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.
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Tel: 781/329-4700
Fax: 781/326-8703
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© Analog Devices, Inc., 1999