AD7746: FAQ

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    AD7746 : External excitation and advice on eliminating interference

    Question Is it possible to use an external excitation device to produce a higher excitation frequency i.e. 1Mhz with the AD7746 device? If yes, what would be the setup/setting/precautions needed to…
  • Article

    AD7746 Software to interface AD7746 Eval Board with my own Application

    Question I'd like to be able to read the data the AD7746 Evaluation Board is producing into my own software, but I can't find any information on this? Answer The evaluation system contains our CDC component…
  • Article

    AD7746_input impedance

    Question I am using AD7746 for voltage measurement (along with a capacitance measurement using the other channel.). What is the input impedence of the voltage channel ADC? Answer The voltage inputs…
  • Article

    CDC selection

    Question I would like to be sure I understand well the principle of the AD7746. I have two sensing capacitors with one plate in commun which is grounded. I would like to sense (C2-C1). Is that…
  • Article

    CDC up to 2nF

    Question Is there a capacitance to Digital converter with which I can measure changes in capacity up to 2 nF? Answer The widest input capacitance range is +/-8pF for ADI Capacitance To Digital converters…
  • Article

    EVAL-AD7746EBZ Evaluation Board Software for Matlab Connection

    Question I would like to create my own application in LabWindows based on AD7746 Evaluation Board Software with capacitive humidity sensor, therefore could I ask you for source code of AD7746 Evaluation…
  • Article

    EVAL-AD7746LDZ - Ground electrode connected to liquid

    Question I read your article „Liquid Level Sensing Using Capacitive-to-Digital Converters“ and I’m interested in this form of level sensing. We received the EVAL-AD7746LDZ to make tests. But we have…
  • Article

    external excitation to AD7746

    Question Is it possible to use an external excitation device to produce a higher excitation frequency i.e. 1Mhz with the AD7746 device? If yes, what would be the setup/setting/precautions needed to…
  • Article

    Measure up to 150pF

    Question Is it possible to measure up to 150pF with the AD774x? Answer Here are two tricks to increase the capacitive input range. 1) Connect a known fixed capacitor in series with the sensor. That…
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    The AD7746 capacitance measurement continues to increase and how to avoid manual interference

    In order to measure the change of water level as small as 0.01mm, I made a water level sensor composed of two concentric metal cylinders inside and outside (outer surface insulation treatment), the diameter…

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