AD9954| Datasheet

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)

400 MSPS, 14-Bit, 1.8 V CMOS, Direct Digital Synthesizer AD9954
FEATURES
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 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 Support for 5 V input levels on most digital inputs PLL-based REFCLK multiplier Internal oscillator, can be driven by a single crystal Phase modulation capability Multichip synchronization

GENERAL DESCRIPTION
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 frequencyagile 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 (see Table 2).

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

BASIC BLOCK DIAGRAM
AD9954
400MSPS DDS CORE 14-BIT DAC DIGITAL SINE WAVE

COMPARATOR REF CLOCK INPUT CIRCUITRY TIMING AND CONTROL

USER INTERFACE

Figure 1.

Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

03374-038