Re: AD9850 DAC output current boost
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Yes I have the APP Note on using the FET to modulate the DDC output.
From: PHSNA@... [mailto:PHSNA@...]
Sent: Tuesday, December 08, 2015 2:52 PM
Subject: [PHSNA] Re: AD9850 DAC output current boost
I haven't played with R-set. There is a graph in the data sheet showing that the best spurious free dynamic range is at an I-out of 10 mA. Going to 20 mA degrades SFDR by a couple of dB or so. Would only add 5 mA to the average current, so I doubt heating would be an issue. Given the I-supply is around 80 mA, it would be about a 10% increase in dissipation.