AD9851 Analog Devices, AD9851 Datasheet

AD9851

Manufacturer Part Number

AD9851

Description

CMOS 180 MHz DDS/DAC Synthesizer

Manufacturer

Analog Devices

Datasheet

1.AD9851.pdf (23 pages)

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GENERAL DESCRIPTION

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 .

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.

FEATURES

180 MHz Clock Rate with Selectable 6

On-Chip High Performance 10-Bit DAC and High Speed

SFDR >43 dB @ 70 MHz A

32-Bit Frequency Tuning Word

Simplified Control Interface: Parallel or Serial

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

APPLICATIONS

Frequency/Phase-Agile Sine Wave Synthesis

Clock Recovery and Locking Circuitry for Digital

Digitally Controlled ADC Encode Generator

Agile L.O. Applications in Communications

Quadrature Oscillator

CW, AM, FM, FSK, MSK Mode Transmitter

Comparator with Hysteresis

Multiplier

Asynchronous Loading Format

Communications

OUT

Reference Clock

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 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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

UPDATE/DATA

FREQUENCY

WORD LOAD

CLOCK IN

MASTER

CLOCK

RESET

REF

FUNCTIONAL BLOCK DIAGRAM

SERIAL

LOAD

AND CONTROL DATA INPUT

40 LOADS

MULTIPLIER

TUNING

1 BIT

DATA INPUT REGISTER

32-BIT

WORD

FREQUENCY/PHASE

FREQUENCY, PHASE

REFCLK

World Wide Web Site: http://www.analog.com

DATA REGISTER

DDS/DAC Synthesizer

PARALLEL

HIGH SPEED

AD9851

CONTROL

8 BITS

5 LOADS

WORDS

LOAD

PHASE

AND

DDS

CMOS 180 MHz

GND

COMPARATOR

10-BIT

DAC

AD9851

ANALOG

OUT

ANALOG

CLOCK OUT

DAC R

SET

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