1 GSPS, 14-Bit, 3.3 V CMOS Direct Digital Synthesizer

The AD9910 is a direct digital synthesizer (DDS) featuring an integrated 14-bit DAC and supporting sample rates up to 1 GSPS. The AD9910 employs an advanced, proprietary DDS technology that provides a significant reduction in power consumption without sacrificing performance. The DDS/DAC combination forms a digitally programmable, high frequency, analog output synthesizer capable of generating a frequency agile sinusoidal waveform at frequencies up to 400 MHz.

The user has access to the three signal control parameters that control the DDS: frequency, phase, and amplitude. The DDS provides fast frequency hopping and frequency tuning resolution with its 32-bit accumulator. With a 1 GSPS sample rate, the tuning resolution is ~0.23 Hz. The DDS also enables fast phase and amplitude switching capability.

The AD9910 is controlled by programming its internal control registers via a serial I/O port. The AD9910 includes an integrated static RAM to support various combinations of frequency, phase, and/or amplitude modulation. The AD9910 also supports a user defined, digitally controlled, digital ramp mode of operation. In this mode, the frequency, phase, or amplitude can be varied linearly over time. For more advanced modulation functions, a high speed parallel data input port is included to enable direct frequency, phase, amplitude, or polar modulation.

The AD9910 is specified to operate over the extended industrial temperature range.

Applications

* Agile local oscillator (LO) frequency synthesis

* Programmable clock generators

* FM chirp source for radar and scanning systems

* Test and measurement equipment

* Acousto-optic device drivers

* Polar modulators

* Fast frequency hopping

* 1 GSPS internal clock speed (up to 400 MHz analog output)

* Integrated 1 GSPS, 14-bit DAC

* 0.23 Hz or better frequency resolution

* Phase noise ≤ −125 dBc/Hz at 1 kHz offset (400 MHz carrier)

* Excellent dynamic performance with >80 dB narrow-band SFDR

* Serial input/output (I/O) control

* Automatic linear or arbitrary frequency, phase, and amplitude sweep capability

* 8 frequency and phase offset profiles

* Sin(x)/(x) correction (inverse sinc filter)

* 1.8 V and 3.3 V power supplies

* Software and hardware controlled power-down

* 100-lead TQFPEP package

* Integrated 1024 word × 32-bit RAM

* PLL REFCLK multiplier

* Parallel datapath interface

* Internal oscillator can be driven by a single crystal

* Phase modulation capability

* Amplitude modulation capability

* Multichip synchronization