Low Power 250 MSPS 10-Bit DAC 1.8 V
CMOS Direct Digital Synthesizer
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) A OUT
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.
ChatNow