CMOS 300 MHz Quadrature
Complete-DDS
a
AD9854
FEATURES
300 MHz Internal Clock Rate
Integrated 12-Bit Output DAC
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, 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
Single Pin FSK and PSK Data Interface
Linear or Nonlinear FM Chirp Functions with Single
Pin Frequency “Hold” Function
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-
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
tion to 17 bits assures excellent SFDR. The AD9854’s circuit
(continued on page 14)
FUNCTIONAL BLOCK DIAGRAM
DAC R
SET
DIGITAL
MULTIPLIERS
300MHz
DDS
DIFF/SINGLE
SELECT
INV.
SINC
12-BIT "I"
DAC
I
ANALOG OUT
ANALOG OUT
FILTER
REF CLK
MULTI-
REFERENCE
CLOCK IN
PLEXER
INV.
SINC
FILTER
12-BIT
"Q" OR
CONTROL DAC
MUX
Q
PHASE/OFFSET
MODULATION
SYSTEM
CLOCK
RAMP-UP/-DOWN
CLOCK/LOGIC
AND
SHAPED
ON/OFF KEYING
FSK/BPSK/HOLD
DATA IN
FREQUENCY TUNING WORD/PHASE WORD
MULTIPLEXER AND RAMP START STOP LOGIC
MULTIPLEXER
12-BIT CONTROL
DAC DATA
48-BIT
FREQUENCY
TUNING WORD
14-BIT PHASE
OFFSET/
MODULATION
12-BIT
AM
MOD
AD9854
ANALOG IN
CLOCK OUT
BIDIRECTIONAL
I/O UPDATE
PROGRAMMING REGISTERS
READ
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
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, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 1999
5秒后页面跳转
74LS32芯片参数、引脚图及功能真值表
全球首块英伟达H200交付 黄仁勋“送货上门”
常用8脚开关电源芯片型号大全
74HC04芯片引脚图及功能、应用电路图讲解
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
