Sound and Vibration Measurement: MCC172 DAQ Hat - analogue front end

RE: Sound and Vibration Measurement: MCC172 DAQ Hat - analogue front end

Jan Cumps — Mon, 11 Apr 2022 18:53:21 GMT

Probe, 50 Hz, 1 Vpp. Yellow is input signal at channel 0, blue is probe point:

Output OPA2774

output + THS4531

output - of the same IC :

ADC AIN +

and AIN- :

RE: Sound and Vibration Measurement: MCC172 DAQ Hat - analogue front end

Jan Cumps — Mon, 11 Apr 2022 18:36:47 GMT

User action photo: probing with the right hand, taking a photo with the left one:

I've been probing if the analysis above makes sense. I think it's correct: Channel input appears inverted after the buffer, then differential on both diff-amp outputs, then differential on ADC inputs AIN+ and AIN-