Amplitude control circuit for the AD9834 waveform generator (DDS) with component data sheet

Photocoupler

Summary:

Circuit function and advantage

The circuit provides an easy way to control the output waveform amplitude of the AD9834, a 75 MHz low power (20 mW) waveform generator (DDS).

DDS (Direct Digital Synthesizer) devices are capable of generating sine, square and triangular output waveforms and can therefore be used as waveform generators.

The AD9834 has built-in phase modulation and frequency modulation. However, to modulate the amplitude of the output signal, a low-power DAC or digital potentiometer is required to set the full-scale current. The amplitude of the full-scale DAC current can be determined by driving a FS ADJUST pin of the AD9834 through a series resistor using a voltage output DAC.

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