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