AD9852AST datasheet(1/42 Pages) AD

Part #	AD9852AST

Description	CMOS 300 MHz Complete-DDS

PDF	42 Pages

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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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.

a

AD9852

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

Tel: 781/329-4700

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

Fax: 781/326-8703

CMOS 300 MHz

Complete-DDS

FUNCTIONAL BLOCK DIAGRAM

PHASE/OFFSET

MODULATION

INV.

SINC

FILTER

14-BIT PHASE

OFFSET/

MODULATION

48-BIT

FREQUENCY

TUNING WORD

FREQUENCY TUNING WORD/PHASE WORD

MULTIPLEXER AND RAMP START STOP LOGIC

RAMP-UP/-DOWN

CLOCK/LOGIC

AND

MULTIPLEXER

12-BIT

DATA

PROGRAMMABLE RATE

AND UPDATE CLOCKS

12

COMPARATOR

AMPLITUDE

MODULATION

DATA

12-BIT CONTROL

DAC

PROGRAMMING REGISTERS

4 –20

REF CLK

MULTI-

PLEXER

AD9852

DIFF/SINGLE

SELECT

REFERENCE

CLOCK IN

FSK/BPSK/HOLD

DATA IN

BIDIRECTIONAL

I/O UPDATE

READ

WRITE

SERIAL/PARALLEL

SELECT

6-BIT ADDRESS

OR SERIAL

PROGRAMMING

LINES

8-BIT PARALLEL

LOAD

MASTER

RESET

+VS

GND

CLOCK OUT

ANALOG IN

SHAPED

ON/OFF KEYING

ANALOG OUT

DAC RSET

ANALOG OUT

300MHz

DDS

I

Q

DIGITAL

MULTIPLIER

12-BIT DDS

DAC

I/O PORT BUFFERS

FEATURES

300 MHz Internal Clock Rate

Integrated 12-Bit Output DACs

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

Single Pin FSK and PSK Data Interface

Linear or Nonlinear FM Chirp Functions with Single

Pin Frequency “Hold” Function

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

3.3 V Single Supply

Multiple Power-Down Functions

Single-Ended or Differential Input Reference Clock

Small 80-Lead LQFP Packaging

APPLICATIONS

Agile, L.O. Frequency Synthesis

Programmable Clock Generator

FM Chirp Source for Radar and Scanning Systems

Test and Measurement Equipment

Commercial and Amateur RF Exciter

GENERAL DESCRIPTION

The AD9852 digital synthesizer is a highly integrated device

that uses advanced DDS technology, coupled with an internal

high-speed, high-performance D/A converters and a comparator

to form a digitally-programmable agile synthesizer function. When

referenced to an accurate clock source, the AD9852 generates a

highly stable, frequency-phase amplitude-programmable sine

wave output that can be used as an agile L.O. in communications,

radar, and many other applications. The AD9852’s innovative

high-speed DDS core provides 48-bit frequency resolution

(1 microHertz tuning steps). Phase truncation to 17 bits assures

excellent SFDR. The AD9852’s circuit architecture allows the

(continued on page 13)

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