GENERAL DESCRIPTION

The AD9837 is a low power, programmable waveform generator capable of producing sine, triangular, and square wave outputs. Waveform generation is required in various types of sensing, actuation, and time domain reflectometry (TDR) applications. The output frequency and phase are software programmable,

allowing easy tuning. The frequency registers are 28 bits wide: with a 16 MHz clock rate, resolution of 0.06 Hz can be achieved; with a 5 MHz clock rate, the AD9837 can be tuned to 0.02 Hz resolution.

FEATURES

Digitally programmable frequency and phase

8.5 mW power consumption at 2.3 V

MCLK speed: 16 MHz (B grade), 5 MHz (A grade)

28-bit resolution: 0.06 Hz at 16 MHz reference clock

Sinusoidal, triangular, and square wave outputs

2.3 V to 5.5 V power supply

3-wire SPI interface

Extended temperature range: −40°C to +125°C

Power-down option

10-lead LFCSP

APPLICATIONS

Frequency stimulus/waveform generation

Liquid and gas flow measurement

Sensory applications: proximity, motion, and defect detection

Line loss/attenuation

Test and medical equipment

Sweep/clock generators

Time domain reflectometry (TDR) applications