AD9852ASQ Analog Devices Inc, AD9852ASQ Datasheet - Page 4

• Manufacturer Part Number: AD9852ASQ
• Manufacturer: Analog Devices Inc

Specifications of AD9852ASQ

• Lead Free Status / RoHS Status: Not Compliant

AD9852
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 converter to form a digitally
programmable agile synthesizer function. When referenced to
an accurate clock source, the AD9852 generates a highly stable
frequency-, phase-, and amplitude-programmable cosine output
that can be used as an agile LO in communications, radar, and
many other applications. The AD9852’s innovative high speed
DDS core provides 48-bit frequency resolution (1 μHz tuning
resolution with 300 MHz SYSCLK). Maintaining 17 bits ensures
excellent SFDR.
The AD9852’s circuit architecture allows the generation of
output signals at frequencies up to 150 MHz, which can be
digitally tuned at a rate of up to 100 million new frequencies
per second. The (externally filtered) cosine wave output can be
converted to a square wave by the internal comparator for agile
clock generator applications. The device provides two 14-bit
phase registers and a single pin for BPSK operation. For high
order PSK operation, the I/O interface can be used for phase
changes. The 12-bit cosine DAC, coupled with the innovative
DDS architecture, provides excellent wideband and narrow-
band output SFDR. When configured with the comparator, the
12-bit control DAC facilitates static duty cycle control in the
high speed clock generator applications. The 12-bit digital
multiplier permits programmable amplitude modulation,
shaped on/off keying, and precise amplitude control of the
cosine DAC output. Chirp functionality is also included for
wide bandwidth frequency sweeping applications. The
AD9852’s programmable 4× to 20× REFCLK multiplier cir-
cuit generates the 300 MHz system clock internally from a
lower frequency external reference clock.
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This saves the user the expense and difficulty of implementing a
300 MHz system clock source. Direct 300 MHz clocking is also
accommodated with either single-ended or differential inputs.
Single-pin, conventional FSK and the enhanced spectral
qualities of ramped FSK are supported. The AD9852 uses
advanced 0.35 μ CMOS technology to provide this high level of
functionality on a single 3.3 V supply.
The AD9852 is available in a space-saving 80-lead LQFP surface-
mount package and a thermally enhanced 80-lead LQFP package.
The AD9852 is pin-for-pin compatible with the
tone synthesizer. The AD9852 is specified to operate over the
extended industrial temperature range of −40°C to +85°C.
OVERVIEW
The AD9852 digital synthesizer is a highly flexible device that
addresses a wide range of applications. The device consists of
an NCO with a 48-bit phase accumulator, a programmable
reference clock multiplier, an inverse sinc filter, a digital
multiplier, two 12-bit/300 MHz DACs, a high speed analog
comparator, and an interface logic. This highly integrated
device can be configured to serve as a synthesized LO agile
clock generator and FSK/BPSK modulator. The theory of
operation for the functional blocks of the device and a technical
description of the signal flow through a DDS device is provided
by Analog Devices in the tutorial
Digital Signal
applications information for a variety of digital synthesis
implementations.
Synthesis. ” The tutorial also provides basic
“A Technical Tutorial on
AD9854
single-