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ADS7953: Analog Input Section

Kumar Sivaraman
Prodigy 60 points

Part Number: ADS7953

Hi Texas Team,

I have selected ADS7953SBDBT TSSOP Package 38Pin in my design where i need to read 16Channel Input from Gas Sensors which are ADC inputs (0.1VDC, 0.25VDC, 0.5VDC and 3VDC) interface to MicroController via SPI.

Find the attached Analog Input Schematic which i had designed for this 16Channels.

Clarify whether any OPAmp circuit is required in the input Stage for this specified voltages.Waiting for your reply as earliest .

Regards

S.Kumar

  • 0
    TI__Mastermind 25070 points

    Hello,

    If all the inputs are DC inputs, an op amp should not be needed.

    the Capacitor selections looks reasonable at 270pF, but I would like to confirm that what the value of the resistor value is

    Is the resistor a 33ogm resistor? What sampling rate are you using?

    Are you seeing any issues with the measurements? Or are you looking for a schematic review?

    Regards

    Cynthia