Other Parts Discussed in Thread: DAC5681Z, , THS3217, THS3215, THS3491
hi,
I am interfacing Dac5681Z with LMH6702 .Output required is 0v to 3v Unipolar. PL confirm whether circuit attached will work.
Thanks
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hello Seema,
Yes, if you have an AC coupled requirement a balun is best with your DC offset brought into the centertap on the secondary. If you need DC coupled output, LMH6702 is a good solution. I would note that for best HD suppression, you need to use both sides of the DAC output. The THS3217 was developed for this application. What you showed looked reasonable for a single sided DAC output solution.
A range of output solutions was featured in this TI Design,
Well the single op amp complementary to single ended is surprisingly messy algebra wise. Part of the difficutly is that the inverting input side will show an active impedance due the dependent signal from the V+ side. To introduce an offset, that would come in from a wideband buffered DC level on the V+ side that would normally go to ground for a bipolar output signal. There was an update to an earlier app. note I did - let me see if I can find it, that original app note appears to be gone SBAA135
But -
we fixed all these issues with the D2S stage of the THS3215 and THS3217 - it would be much easier (for you) to just use that?