Raspberry

Hi Paul. I think the problem is in the input section of your schematic. You are using 1Mohm and 100Kohm resistors for a voltage divider. Say, I applied 10.000 volts...

@tardate Have a look at the attachment. I do not see a problem attaching the voltage divider directly onto the LTC2400 input. 

Another interesting point @tardate about DAC is in this video https://www.youtube.com/watch?v=z5Pnw9Xr2ME&feature=youtu.be (start from 31:00) HOWEVER, we should be talking about millivolts. Like 10 millivolts. I have had a much larger...

@zoomx There is a voltage divider (100k / 900k - I have replaced 1m resistor with 900k) before LTC2400. This divides voltage by 10. Therefore, 10V becomes 1V etc.

@ tardate I think you are correct - using AD820 opam or similar is unavoidable. Something like this.  Unfortunately, I do not have a spare LTC2400 to test on...

This is an idea for an analogue daughter board:  Works really precisely.

@tardate Excellent notes I must admit. A week ago I have re-read LTC2400 datasheet and soldered 10uF cap to the voltage divider. To my surprise reading especially on the higher...

I am going to order OPA2388IDGKT now: The OPAx388 (OPA388, OPA2388, and OPA4388) series of precision operational amplifiers are ultra-low noise, fast-settling, zero-drift, zero-crossover devices that provide rail-to-rail input and...

Hi Paul, I have tried using OPA388. Sadly, I cannot see beter performance - on 10.000000V reference I get 9.956889. I’m using precise resistors (0.1%) on the voltage divider. What...

@tardate Hi Paul, Interesting observations. As we are trying to extract everything down to 6th digit, I think there may be a problem using a breadboard. The breadboard is just...