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Image AD9850
型号: AD9850
厂商: Analog Devices Inc Analog Devices Inc
标准:
分类: 半导体
描述: cmos, 125 mhz complete dds synthesizer
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CMOS, 125 MHz  
Complete DDS Synthesizer  
a
AD9850  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
125 MHz Clock Rate  
+V  
GND  
S
On-Chip High Performance DAC and High Speed  
Comparator  
DAC SFDR > 50 dB @ 40 MHz AOUT  
32-Bit Frequency Tuning Word  
Simplified Control Interface: Parallel Byte or Serial  
Loading Format  
Phase Modulation Capability  
+3.3 V or +5 V Single Supply Operation  
Low Power: 380 mW @ 125 MHz (+5 V)  
Low Power: 155 mW @ 110 MHz (+3.3 V)  
Power-Down Function  
DAC R  
SET  
REF  
HIGH SPEED  
DDS  
CLOCK IN  
10-BIT  
DAC  
ANALOG  
OUT  
MASTER  
RESET  
PHASE  
32-BIT  
TUNING  
WORD  
AND  
ANALOG  
IN  
CONTROL  
WORDS  
FREQUENCY  
UPDATE/  
DATA REGISTER  
RESET  
FREQUENCY/PHASE  
DATA REGISTER  
CLOCK OUT  
CLOCK OUT  
WORD LOAD  
CLOCK  
COMPARATOR  
DATA INPUT REGISTER  
SERIAL  
LOAD  
AD9850  
PARALLEL  
LOAD  
Ultrasmall 28-Lead SSOP Packaging  
1-BIT  
40 LOADS  
8-BITS  
APPLICATIONS  
5 LOADS  
Frequency/Phase–Agile Sine-Wave Synthesis  
Clock Recovery and Locking Circuitry for Digital  
Communications  
FREQUENCY, PHASE, AND CONTROL  
DATA INPUT  
Digitally Controlled ADC Encode Generator  
Agile Local Oscillator Applications  
combination thereof. The AD9850 also contains a high speed  
comparator that can be configured to accept the (externally)  
filtered output of the DAC to generate a low jitter square wave  
output. This facilitates the device’s use as an agile clock gen-  
erator function.  
GENERAL DESCRIPTION  
The AD9850 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 com-  
plete digitally programmable frequency synthesizer and clock  
generator function. When referenced to an accurate clock  
source, the AD9850 generates a spectrally pure, frequency/  
phase-programmable, analog output sine wave. This sine wave  
can be used directly as a frequency source or converted to a  
square wave for agile-clock generator applications. The AD9850’s  
innovative high speed DDS core provides a 32-bit frequency  
tuning word, which results in an output tuning resolution of  
0.0291 Hz, for a 125 MHz reference clock input. The  
AD9850’s circuit architecture allows the generation of output  
frequencies of up to one-half the reference clock frequency (or  
62.5 MHz), and the output frequency can be digitally changed  
(asynchronously) at a rate of up to 23 million new frequencies  
per second. The device also provides five bits of digitally  
controlled phase modulation, which enables phase shifting of its  
output in increments of 180°, 90°, 45°, 22.5°, 11.25° and any  
The frequency tuning, control, and phase modulation words are  
loaded into the AD9850 via a parallel byte or serial loading  
format. The parallel load format consists of five iterative loads  
of an 8-bit control word (byte). The first byte controls phase  
modulation, power-down enable, and loading format; bytes 2–5  
comprise the 32-bit frequency tuning word. Serial loading is  
accomplished via a 40-bit serial data stream on a single pin. The  
AD9850 Complete-DDS uses advanced CMOS technology to  
provide this breakthrough level of functionality and performance  
on just 155 mW of power dissipation (+3.3 V supply).  
The AD9850 is available in a space saving 28-lead SSOP, sur-  
face mount package. It is specified to operate over the extended  
industrial temperature range of –40°C to +85°C.  
REV. E  
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  
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