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AD9838 DDS Amplitude adjustment

Hi, is it possible to adjust the amplitude of the sine wave in the AD9838. It is described as a waveform generator and the App note shows that a typical DDS has a 12 bit AM (Amplitude modulation) adjustment. Any help would be much appreciated. Thanks

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  • We did manage to achieve a really nice ramp on the waveform by applying a PWM signal through a RC network to generate a linear ramp. Since we are working with 130dB of audio gain, we did have to add some tricky firmware to adjust the ramp to be non-linear when starting the output ramp to remove an audio click. Works very well now- boards due back this week. Thanks

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