400 MSPS, 14-Bit, 1.8 V CMOS, Direct Digital Synthesizer

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.

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

* 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 input/output (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

* PLL-based REFCLK multiplier

* Internal oscillator, can be driven by a single crystal

* Phase modulation capability

* Multichip synchronization