Other Parts Discussed in Thread: INA159, REF5025
Hi,
I have a sensor with a voltage output of plus-minus 10 V.
In order to use it I bought an INA 159 and an ADS1256.
The Ads is part of a raspberry pi hat, called waveshare ad/da precision board :
The setup works, however I have a problem with the reference voltage for the INA. I put Ref 1 on ground, ref2 I connected with the VCC of the raspberry pi hat. This makes no sense, I guess, because this is just the voltage of the USB power. Actually, the adc gets its reference voltage from a LM285, which outputs 2.5 v on vrefP which goes in pin 4 of the ADS1256.
Should i connect ref 2 to pin 4 of the Ads to use vrefP as reference for the INA? Should I connect ref 1 and 2 together in this case?
Is there any other way to get independent from the reference voltage?
Cheers
Nils