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INA592: Input Voltage Range

Part Number: INA592

I am operating INA592 with Gain 2 configuration adn with a Single Supply of 2.5V.

I am using it to correct the offset and hence the signal is given to REF and the TI DAC 7571 output is given to Sense. With both the inputs at 2.5V I am getting 185mV as output though I expect it to be 0V.

I am also not able to understand the common mode range as in the specification. For a single supply operation at 5V what is the input voltage range?

Would you advise this to work then in Dual Supply +5V and -5V. 

  • Hi Kavitha,

    Thank you for your post, I can help you. 

    You mentioned that you are operating the INA592 with a single supply of 2.5V. The minimum supply on the INA592 is 4.5V. The input common mode voltage range is unique on this device since the input resistors on the non-inverting node of the amplifier form a 1/3 voltage divider. This is why you are able to process input voltages beyond the supply. 

    I can help you put together a circuit, please help answer the following questions:

    • What supplies to you have available?
    • What is the input differential voltage?
    • What is your expected output voltage?
    • What is your reference voltage? The reference voltage is a level-shift voltage seen at the output. Vout = gain * input voltage + ref
    • What is your common mode voltage? (Voltage that is the same on both inputs)

    To learn more about difference amplifiers and how to design for linear behavior, watch this training video: https://training.ti.com/ti-precision-labs-instrumentation-amplifer-topologies-one-amp-theory?context=1139747-1139745-1140241-1147221

  • I am operating with +5V single supply. But I get the output voltage as 180mV when both my inputs are the same. For example 2.5V. I am trying to use this for IA for offset correction for a precision sensor and end up in a offset of 180mV. This stage is followed by a PGA and hence this offset of 180mV is too large for my operation. Can I go ahead with IAN826. My signal offset has to be subtracted from a DAC using the IA

  • Hi,

    Thank you for the additional information. Please send me a picture of your schematic. I understand your supplies are 5V single supply, the inputs are 2.5V and you expect 0V at the output. What is your reference voltage?

    A picture of your schematic would be really helpful, showing all connections.