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AMC1100: OPA2388, AMC1100-Q1

Mastik Kumar
Prodigy 130 points
Part Number: AMC1100
Other Parts Discussed in Thread: ADC161S626, OPA2388-Q1

Hi,

I've chosen an operational amplifier (opamp) that can convert a 10V analog signal to a lower voltage, which will be fed into an isolated differential amplifier. The resulting differential signal will then be directed to an ADC. I'm planning to investigate the ADC161S626 further.

Could you please confirm whether this architecture is appropriate for processing low-frequency signals? Specifically, I'm interested in signals within the range of (0-5) Hz and (0-10)V analog signal.

OpAmp: OPA2388-Q1,  Input given 0-10V Sine wave with 5Hz frequency

Isolated Diff Amp: AMC1100-Q1

ADC : ADC161S626

Please let me know if anything is required for this.

  • +1
    TI__Guru**** 153036 points

    Hello Mastic,

    You don't need an op amp (and more supply voltages) for this. However AMC1100-Q1 is a poor choice. The input range is +/-250mV, so input is bi-directional and input is single polarity. Input impedance is typical 28k ohms so a voltage input divider will lose accuracy.

    Below is a better example; input divider reduces 0V-10V to 0-2V ; AMC input is high impedance, so resistors alone set scaling.