400 MSPS, 14-Bit, 1.8 V CMOS,

Direct Digital Synthesizer

AD9954

Rev. B

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FEATURES

400 MSPS internal clock speed

Integrated 14-bit DAC

Programmable phase/amplitude dithering

32-bit frequency tuning accuracy

14-bit phase tuning accuracy

Phase noise better than –120 dBc/Hz

Excellent dynamic performance

>80 dB narrowband SFDR

Serial I/O control

Ultrahigh speed analog comparator

Automatic linear and nonlinear frequency sweeping

4 frequency/phase offset profiles

1.8 V power supply

Software and hardware controlled power-down

48-lead TQFP

Integrated 1024 word × 32-bit RAM

Support for 5 V input levels on most digital inputs

PLL-based REFCLK multiplier

Internal oscillator, can be driven by a single crystal

Phase modulation capability

Multichip synchronization

APPLICATIONS

Agile LO frequency synthesis

Programmable clock generators

FM chirp source for radar and scanning systems

Automotive radars

Test and measurement equipment

Acousto-optic device drivers

GENERAL DESCRIPTION

The AD9954 is a direct digital synthesizer (DDS) that uses

advanced technology, coupled with an internal high speed, high

performance DAC to form a complete, digitally programmable,

high frequency synthesizer capable of generating a frequency-

agile analog output sinusoidal waveform at up to 160 MHz.

The AD9954 enables fast frequency hopping coupled with fine

tuning of both frequency (0.01 Hz or better) and phase (0.022°

granularity).

The AD9954 is programmed via a high speed serial I/O port.

The device includes static RAM to support flexible frequency

sweep capability in several modes, plus a user-defined linear

sweep mode of operation. Also included is an on-chip high

speed comparator for applications requiring a square wave

output. An on-chip oscillator and PLL circuitry provide users

with multiple approaches to generate the device’s system clock.

The AD9954 is specified to operate over the extended industrial

temperature range (see Table 2).

BASIC BLOCK DIAGRAM

COMPARATOR

400MSPS

DDS CORE

14-BIT

DAC

REF CLOCK

INPUT CIRCUITRY

TIMING AND

CONTROL

DIGITAL

SINE

WAVE

USER INTERFACE

AD9954

Figure 1.