Hello
Would it be possible to effectively use gain factor of about 2000 (5 ohm R8/9)?
Best regards
PecenkA
In principle this is OK.
The only problem is the input offset voltage. Typical value for the TLV274 is 0.5mV.
If you are using gain 2000 this causes 1V error to the output.
You’ll find more details from this datasheet:
ti.com/lit/gpn/tlv274
See p. 44 of this manual how to compensate the offset voltage effect to the output:
focus.ti.com/lit/an/sboa092a/sboa092a.pdf
If I understand the data you provided correctly, 1 V output error would not be a problem if I were to measure only difference in voltage between analog input 1 and 2 - two calibrated sensors of the same type?
Please note, the offset may be different for the analog inputs 1 and 2.
Please note also the 0.5mV is typical value, the max. offset is 5mV.
Thank you for very usefull information.