AD604 as front end

I am interested in use AD604 as the front end to an instrument, this instrument will work up to 1Mhz, I need lowest noise possible and Input Impedance of 20K

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  • Hi Jstaley:

    thanks for your answer, let me explain what I am trying to do:

    It is an instrument with a 2 o 3 feet coaxial cable probe, therefore length is not the problem, but I can not load the circuit I am measuring, therefore I am just guessing 20K will do, the measurements are from mV to 40 V rms, this are my questions:

    1. Can I add a decoupling capacitor in series to PAI to have just AC measurements?
    2. I see the input resistance is 300K, can I input the low voltage signal (+- 400mV) to be measured straight to PAI without an input resistor 
    3. For the higher voltages up to 40V rms can I just use a simple resistor divider? in order to be below the +-400mV?

    Thanks

Reply
  • Hi Jstaley:

    thanks for your answer, let me explain what I am trying to do:

    It is an instrument with a 2 o 3 feet coaxial cable probe, therefore length is not the problem, but I can not load the circuit I am measuring, therefore I am just guessing 20K will do, the measurements are from mV to 40 V rms, this are my questions:

    1. Can I add a decoupling capacitor in series to PAI to have just AC measurements?
    2. I see the input resistance is 300K, can I input the low voltage signal (+- 400mV) to be measured straight to PAI without an input resistor 
    3. For the higher voltages up to 40V rms can I just use a simple resistor divider? in order to be below the +-400mV?

    Thanks

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