Other Parts Discussed in Thread: LMP2022,
Hi.
I've designed a PCB using ADS131m08 and LMP2022 amplifiers to read 4 load cell outputs.
I've tested it and there is no problem.
But, I want to remove the external amplifier and only use the internal amplifier.
I tested the ADS131m08 eval board and everything is ok and I could read the load cell outputs using the internal amplifier.
Then, I removed the external amplifier from my custom board and tried to read the values. With Gain=1 and Gain=2, everything is ok. But, when I change the gain to 3, values go negative but still change when I change the load.
The offset voltage for the eval board is about 1.2V, and for the custom board is about 500mV.
I wonder if you guide me regarding this issue and solve the problem.
Thanks