DAC has a lot of offset

Beowulff
Posts: 17
Joined: Fri Mar 01, 2019 2:59 am

DAC has a lot of offset

Postby Beowulff » Thu Jun 04, 2020 11:02 pm

Has anyone else experienced this?
Both DAC channels have between 4 and 10mV of offset when they are supposed to be at zero volts.

This is a problem for me, since I really need the output to go to zero when it is supposed to.

Beowulff
Posts: 17
Joined: Fri Mar 01, 2019 2:59 am

Re: DAC has a lot of offset

Postby Beowulff » Sat Jun 06, 2020 5:56 pm

I wasn't able to find any suggestions on how to fix this, so I added a small positive bias voltage to the non-inverting input of my Op Amp signal conditioner. This fixed the problem, but at the expense of a new board revision, and some reduced dynamic range (zero volts out now starts at a DAC count of 20 or so).

Who is online

Users browsing this forum: No registered users and 15 guests