[time-nuts] Question about AD9832 "I out Full Scale" (what does it mean?)

Bruce Griffiths bruce.griffiths at xtra.co.nz
Thu Nov 17 23:49:49 EST 2016


With no internal PLL to generate a higher internal frequency than the 25MHz MCLK, that 1MHz waveform looks a bit too smooth for an unfiltered 1MHz output.
Bruce 

    On Friday, 18 November 2016 5:12 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
 

 Trying to figure out what "Iout Full Scale" means on the AD9832.
Some time nuts may have used this one.

On page 7 of this doc:

http://www.analog.com/media/en/technical-documentation/user-guides/UG-313.pdf

It shows the AD9832 output as 572 mV peak to peak
across 300 ohms.  This works out to 1.9 mA peak to
peak current through the resistor.  But Rset on the
board is 3.9K, which is supposed to give a value
for so-called "Iout Full Scale" of 3.878 mA.

I would have thought (just guessing) that peak to
peak output current would be equal to Iout Full
Scale, but it appears to be only half of that.

Can anyone clarify this?

Rick
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