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INA183: INA183 output

Mark Chen52
Expert 6495 points
Part Number: INA183

Hi Expert,

About the INA183 50V/V, customer was thinking if  can use a voltage divider at the output of INA183.

The voltage divider ratio is set to 50% so that the Vout will be half of its original value.

Is there any concerns for you?

Regards,

Mark

  • 0
    Guru 140200 points

    Hi Mark,

    no. It only has to be kept in mind, that the resistances of voltage divider can act with stray capacitances and input capacitance of following electronics (appearing at the Vout pin) and form a low pass filter. And if the following electronics shows a relevant input bias current, a voltage drop can occur across the 5k source resistance (the two 10k resistor appearing in parallel) resulting in an unwanted offset voltage.

    So it can be necessary to decrease the resistance values.

    Kai

  • 0
    TI__Mastermind 29555 points

    Hello Mark,

    It is perfectly acceptable to use a resistor divider on the output. The main downsides are system related. They are increased thermal noise, increased overall Vshunt gain error and drift due to resistor tolerances, and increased output current leakage (power loss if Rout is low). Additionally, when you add resistance to output you can create additional error if directly being measured by SAR ADC. As long as you balance these factors and consider them with your error allowance of measurement error it is acceptable and reliable.

    Sincerely,

    Peter