Well, here is response from ADI:
Quote:
If I remember correctly, this part implements a differential DAC current
source, but only one of the outputs is bonded externally.
In this case, the current settle by Rset should be divided by 2...,
which explain your results.
I'll update the DS as soon
Bruce, I assume you are talking about Figure 12 of UG-313.
If an LCD scope is not in single shot mode it will show a composite of many
cycles which will hide the stairsteps (especially if the frequency control
word is not a nice round binary number) in the fuzz.
I think the 0.1uF capacitor on IOU
There is something wrong with the example. The output is single-ended,
so using info from the AD9832 data sheet with Rset=3.9K and Rload=300
ohms as shown in the EVB schematic, it should go from 0 to 3.88mA and 0
to 1.16V. Figure 12 shows only half this, including only about .3V DC
bias inste
rich...@karlquist.com said:
> 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?
Don't overlook a bug in the data sheet.
The data sheet for the actual part at
http://www
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
wrote:
Trying to figure out what "Iout Full Scale" means on the
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
