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ADS112C04: input of analog input

ttd
Mastermind 8600 points
Part Number: ADS112C04

Dear Technical Support Team,

Could you show me the detail value of  impedance for analog input?

According to the datasheet, analog input is connected with internal PGA so it's hi-impedance. 

Best Regards,

 ttd

  • +1
    TI__Guru** 113765 points

    Hi ttd,

    There are actually two possible input conditions for the ADS112C04.  One is the high impedance PGA path and the other is with the PGA bypassed for use with single-ended measurements.  There are also two operating modes where the input current can also differ and that is normal mode and turbo mode.  Input voltage and operating temperature can also affect the input current.  So instead of giving an impedance value the input current specifications are given instead.  The input current is given in the ADS112C04 datasheet in section 6.5 at the top of the Electrical Characteristics table.  Also, to give a better overall view of the input currents at the various operating conditions, Figures 4 through 11 are used to show the typical response of the current.

    Best regards,

    Bob B