Hello Dear Respected Sir/ Ma'am,
I am trying to use instrumentation amplifier with part number of INA 818ID to amplify and denoise the output of GMR current sensor. My sensor is able to generate max 400mV and its output impedance is 2.5kohm. Gain resistor that I am using with this IA is a 1kohm to generate voltage gain of 6. I have couple of questions about your product as:
1. Is this device suitable for the GMR sensor with the mentioned specifications?
2. When I am implementing small voltages around 20mV till 250mV directly to input of the IA, I am not getting gain of 6 always. In other words, according to the voltage I am giving as signal to IA, gain is not fixed. Is there any reason and solution for this problem?
Please let me know if further information is needed to reply these questions.
Sincerely Yours,
Sama Salehi Vala