Low Power 250 MSPS 10-Bit DAC 1.8 V

CMOS Direct Digital Synthesizer

Data Sheet

AD9913

Rev. E

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FEATURES

50 mW at up to 250 MSPS internal clock speed

100 MHz analog output

Integrated 10-bit DAC

0.058 Hz or better frequency resolution

0.022° phase tuning resolution

Programmable modulus in frequency equation

Phase noise ≤ –135 dBc per Hz @ 1 kHz offset (DAC output)

(<115 dBc per Hz when using on-board PLL multiplier)

Excellent dynamic performance

>80 dB SFDR @ 100 MHz (±100 kHz offset) AOUT

Automatic linear frequency sweeping capability

8 frequency or phase offset profiles

1.8 V power supply

Software and hardware controlled power-down

Parallel and serial programming options

32-lead LFCSP package

Optional PLL REF_CLK multiplier

Internal oscillator (can be driven by a single crystal)

Phase modulation capability

APPLICATIONS

Portable and handheld equipment

Agile LO frequency synthesis

Programmable clock generator

FM chirp source for radar and scanning systems

GENERAL DESCRIPTION

The AD9913 is a complete direct digital synthesizer (DDS)

designed to meet the stringent power consumption limits of

portable, handheld, and battery-powered equipment. The

AD9913 features a 10-bit digital-to-analog converter (DAC)

operating up to 250 MSPS. The AD9913 uses advanced DDS

technology, coupled with an internal high speed, high

performance DAC to form a complete, digitally-program-

mable, high frequency synthesizer capable of generating a

frequency agile analog output sinusoidal waveform at up to

100 MHz.

The AD9913 provides fast frequency hopping and fine tuning

resolution. The AD9913 also offers fine resolution phase offset

control. Control words are loaded into the AD9913 through the

serial or parallel I/O port. The AD9913 also supports a user-

defined linear sweep mode of operation for generating highly

linearized swept waveforms of frequency. To support various

methods of generating a system clock, the AD9913 includes an

oscillator, allowing a simple crystal to be used as the frequency

reference, as well as a high speed clock multiplier to convert the

reference clock frequency up to the full system clock rate. For

power saving considerations, many of the individual blocks of

the AD9913 can be powered down when not in use.

The AD9913 operates over the extended industrial temperature

range of −40°C to +85°C.

FUNCTIONAL BLOCK DIAGRAM

REF_CLK INPUT

CIRCUITRY

TIMING AND

CONTROL LOGIC

DDS

10-BIT

DAC

USER INTERFACE

AD9913

Figure 1.