1 GSPS Direct Digital Synthesizer with 14-Bit DAC

The AD9912 is a direct digital synthesizer (DDS) that features an integrated 14-bit digital-to-analog converter (DAC). The AD9912 features a 48-bit frequency tuning word (FTW) that can synthesize frequencies in step sizes no larger than 4 μHz. Absolute frequency accuracy can be achieved by adjusting the DAC system clock.

The AD9912 also features an integrated system clock phase-locked loop (PLL) that allows for system clock inputs as low as 25 MHz.

The AD9912 operates over an industrial temperature range, spanning −40°C to +85°C.

APPLICATIONS

* Agile LO frequency synthesis

* Low jitter, fine tune clock generation

* Test and measurement equipment

* Wireless base stations and controllers

* Secure communications

* Fast frequency hopping

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

* Integrated 1 GSPS 14-bit DAC

* 48-bit frequency tuning word with 4 μHz resolution

* Differential HSTL comparator

* Flexible system clock input accepts either crystal or external reference clock

* On-chip low noise PLL REFCLK multiplier

* 2 SpurKiller channels

* Low jitter clock doubler for frequencies up to 750 MHz

* Single-ended CMOS comparator; frequencies of <150 MHz