Recently, I have debugged the acquisition circuit of AC small signal current to voltage. As shown in the figure below, connect pin 2 to ground and input a sine wave with an amplitude of about 20mV to pin 3. Set R23=500R, gain G=1+50K/R23, that is, put about 100 The load RL(2K) connected to the output terminal measures a sine wave of less than 2V. I tried several of them. The same is true after changing +5V to +15V and -5V to -15V. Change 5 pin REF The pin is grounded and there is no response, the more fuzzy you feel about the amplifier?
Ricardo 發表於 January 20, 2021
Are there any waveforms on pins 1, 8?
Nora 發表於 January 20, 2021
Connect a capacitor to pin 5 to test it. REF can't be empty. The input signal needs to be differential. Is your input satisfied?
Piper 發表於 January 20, 2021
According to your connection method, the simulation can be enlarged 100 times. In addition, the 8-pin package in your picture is not 16-pin, and 16-pin has a pin to output.
