[quote user="Atsushi Okui"]
=> Actually, they would like to add offset on output voltage. The important thing for considering offset and gain error between each channels is to add accurate offset voltage on output.
[/quote]
So, you are not interested in true zero, but only in matching the channels to each other. Correct?
Can you share the details of the application?
I have a few questions that will help me make better recommendations.
- What is the voltage output range of interest?
- What is the code range of interest?
- Why is channel matching important? What is the type of application this is used in?
- Are you planning to individually measure each DAC output and then calibrate from the resulting value?
- Why is software calibration not an option?
- Do they already have a working design with 4 single output DACs? How are they matching these devices?
If you need to discuss any of this in private, we can move this conversation off the forum and have a private email conversation. If this is the case, is it okay to use your registered E2E forum email?