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Tool/software:
Hello all,
I need to read Voltage and Current from a device, very precise measurements and I decided to select the ADS1219. Following some reference designs and forum posts, I am not 100% sure if I need tto use a voltage follower or not at all. Neitther if tthe external ref. voltage is okay with 2.5v or 2.048v. I also need to separatet grounds from the measurement side and ucontroller side.
Would you mind to ttake a look to tthe schematic and give some advice of the changes needed?
Tthank you in advance!
Hi Oriol,
if tthe external ref. voltage is okay with 2.5v or 2.048v.
Using an external reference of 2.5V or 2.048V is okay as these are within the acceptable range of the ADC:
The different reference values would simply change weather you can read voltages up to 2.5V or 2.048V, and change the LSB value accordingly:
You could also use the ADC's internal voltage reference.
One thing we typically recommend is to use Anti-aliasing filters at the inputs of the ADC. From section 9.1.4 of the data sheet:
I am not 100% sure if I need tto use a voltage follower or not
As you can see from the block diagram, using an amplifier to the inputs of the ADC should be okay
I would reach out to the amplifier team for additional questions on this part of your circuit.
Best Regards,
Angel
