AD9854 Analog Devices, AD9854 Datasheet
AD9854
Manufacturer Part Number
AD9854
Description
CMOS 300 MHz Quadrature Complete-DDS
Manufacturer
Analog Devices
Datasheet
1.AD9854.pdf
(44 pages)
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a
REV. 0
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.
FSK/BPSK/HOLD
BIDIRECTIONAL
FEATURES
300 MHz Internal Clock Rate
Integrated 12-Bit Output DAC
Ultrahigh-Speed, 3 ps RMS Jitter Comparator
Excellent Dynamic Performance: 80 dB SFDR @ 100 MHz
4
Dual 48-Bit Programmable Frequency Registers
Dual 14-Bit Programmable Phase Offset Registers
12-Bit Amplitude Modulation and Programmable
Single Pin FSK and PSK Data Interface
Linear or Nonlinear FM Chirp Functions with Single
Frequency-Ramped FSK
<25 ps RMS Total Jitter in Clock Generator Mode
Automatic Bidirectional Frequency Sweeping
SIN(x)/x Correction
Simplified Control Interface
REFERENCE
DIFF/SINGLE
CLOCK IN
( 1 MHz) A
Shaped On/Off Keying Function
10 MHz Serial, 2-Wire or 3-Wire SPI-Compatible or
100 MHz Parallel 8-Bit Programming
Pin Frequency “Hold” Function
I/O UPDATE
to 20
DATA IN
SELECT
WRITE
READ
Programmable Reference Clock Multiplier
OUT
REF CLK
PLEXER
SERIAL/PARALLEL
4 –20
SYSTEM
MULTI-
CLOCK
SELECT
MULTIPLEXER AND RAMP START STOP LOGIC
FREQUENCY TUNING WORD/PHASE WORD
TUNING WORD
FREQUENCY
48-BIT
300MHz
6-BIT ADDRESS
PROGRAMMING
I/O PORT BUFFERS
OR SERIAL
LINES
PHASE/OFFSET
MODULATION
14-BIT PHASE
MODULATION
FUNCTIONAL BLOCK DIAGRAM
OFFSET/
PROGRAMMING REGISTERS
8-BIT PARALLEL
DDS
LOAD
Q
AD9854
I
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
GENERAL DESCRIPTION
The AD9854 digital synthesizer is a highly integrated device
that uses advanced DDS technology, coupled with two internal
high-speed, high-performance quadrature D/A converters and a
comparator to form a digitally-programmable I and Q synthesizer
function. When referenced to an accurate clock source, the
AD9854 generates highly stable, frequency-phase-amplitude-
programmable sine and cosine outputs that can be used as an
agile L.O. in communications, radar, and many other applications.
The AD9854’s innovative high-speed DDS core provides 48-bit
frequency resolution (1 microHertz tuning steps). Phase trunca-
tion to 17 bits assures excellent SFDR. The AD9854’s circuit
FILTER
FILTER
SINC
SINC
INV.
INV.
3.3 V Single Supply
Multiple Power-Down Functions
Single-Ended or Differential Input Reference Clock
Small 80-Lead LQFP Packaging
APPLICATIONS
Agile, Quadrature L.O. Frequency Synthesis
Programmable Clock Generator
FM Chirp Source for Radar and Scanning Systems
Test and Measurement Equipment
Commercial and Amateur RF Exciter
MASTER
RESET
RAMP-UP/-DOWN
PROGRAMMABLE RATE
CLOCK/LOGIC
MULTIPLEXER
AND UPDATE CLOCKS
MULTIPLIERS
CMOS 300 MHz Quadrature
DIGITAL
12-BIT
AND
MOD
AM
+V
S
World Wide Web Site: http://www.analog.com
GND
MUX
12-BIT CONTROL
DAC DATA
CONTROL DAC
COMPARATOR
DAC R
12-BIT "I"
"Q" OR
12-BIT
Complete-DDS
DAC
© Analog Devices, Inc., 1999
SET
AD9854
(continued on page 14)
CLOCK OUT
SHAPED
ON/OFF KEYING
ANALOG OUT
ANALOG OUT
ANALOG IN
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