Image AD9851
型号: AD9851
厂商: Analog Devices Inc Analog Devices Inc
标准:
分类: 半导体
描述: cmos 180 mhz dds/dac synthesizer
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CMOS 180 MHz  
a
DDS/DAC Synthesizer  
AD9851  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
180 MHz Clock Rate with Selectable 6
؋
 Reference Clock  
Multiplier  
GND  
+V  
S
On-Chip High Performance 10-Bit DAC and High Speed  
Comparator with Hysteresis  
SFDR >43 dB @ 70 MHz AOUT  
32-Bit Frequency Tuning Word  
Simplified Control Interface: Parallel or Serial  
Asynchronous Loading Format  
5-Bit Phase Modulation and Offset Capability  
Comparator Jitter <80 ps p-p @ 20 MHz  
+2.7 V to +5.25 V Single Supply Operation  
Low Power: 555 mW @ 180 MHz  
Power-Down Function, 4 mW @ +2.7 V  
Ultrasmall 28-Lead SSOP Packaging  
AD9851  
DAC R  
SET  
REF  
6
؋
 REFCLK  
CLOCK IN  
MULTIPLIER  
10-BIT  
DAC  
ANALOG  
OUT  
HIGH SPEED  
DDS  
MASTER  
RESET  
PHASE  
AND  
CONTROL  
WORDS  
32-BIT  
TUNING  
WORD  
ANALOG  
IN  
FREQUENCY  
UPDATE/DATA  
REGISTER  
FREQUENCY/PHASE  
DATA REGISTER  
CLOCK OUT  
RESET  
WORD LOAD  
CLOCK  
CLOCK OUT  
DATA INPUT REGISTER  
SERIAL  
LOAD  
COMPARATOR  
PARALLEL  
LOAD  
1 BIT 
؋
 
40 LOADS  
8 BITS 
؋
 
5 LOADS  
APPLICATIONS  
FREQUENCY, PHASE  
AND CONTROL DATA INPUT  
Frequency/Phase-Agile Sine Wave Synthesis  
Clock Recovery and Locking Circuitry for Digital  
Communications  
Digitally Controlled ADC Encode Generator  
Agile L.O. Applications in Communications  
Quadrature Oscillator  
CW, AM, FM, FSK, MSK Mode Transmitter  
GENERAL DESCRIPTION  
The AD9851 contains an internal high speed comparator that  
can be configured to accept the (externally) filtered output of  
the DAC to generate a low jitter output pulse.  
The AD9851 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 frequency synthesizer and clock generator func-  
tion. When referenced to an accurate clock source, the AD9851  
generates a stable frequency and phase-programmable digitized  
analog output sine wave. This sine wave can be used directly as  
a frequency source, or internally converted to a square wave for  
agile-clock generator applications. The AD9851’s innovative  
high speed DDS core accepts a 32-bit frequency tuning word,  
which results in an output tuning resolution of approximately  
0.04 Hz with a 180 MHz system clock. The AD9851 contains a  
unique 6× REFCLK Multiplier circuit that eliminates the need  
for a high speed reference oscillator. The 6× REFCLK Multiplier  
has minimal impact on SFDR and phase noise characteristics.  
The AD9851 provides five bits of programmable phase modula-  
tion resolution to enable phase shifting of its output in incre-  
ments of 11.25°.  
The frequency tuning, control and phase modulation words are  
asynchronously loaded into the AD9851 via parallel or serial  
loading format. The parallel load format consists of five itera-  
tive loads of an 8-bit control word (byte). The first 8-bit byte  
controls output phase, 6× REFCLK Multiplier, power-down  
enable and loading format; the remaining bytes comprise the  
32-bit frequency tuning word. Serial loading is accomplished  
via a 40-bit serial data stream entering through one of the parallel  
input bus lines. The AD9851 uses advanced CMOS technology  
to provide this breakthrough level of functionality on just 555 mW  
of power dissipation (+5 V supply), at the maximum clock rate of  
180 MHz.  
The AD9851 is available in a space-saving 28-lead SSOP, sur-  
face mount package that is pin-for-pin compatible with the  
popular AD9850 125 MHz DDS. It is specified to operate over  
the extended industrial temperature range of –40°C to +85°C at  
>3.0 V supply voltage. Below 3.0 V, the specifications apply  
over the commercial temperature range of 0°C to +85°C.  
REV. 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, 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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