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INA326 and 100mV reference voltage (using LM111)

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Hi Pete el al,

In this topic: 

We are using the INA326 device, to convert range (0V-5V) to (0V-3.3V). And in this version, we decided to ignore the non-linear region of output INA326.

And for preparing the next one, I want to update the schematic, so we can fully convert (0V-5V) to (0.1V-3.3V).

1. Solution 1: I use a LM111 device for creating the low reference voltage, please see the simulation attached file and help give me advice or suggest me a better device.

INA326_LM111.TSC

2. Solution 2: Can I supply the negave voltage for INA326 at V- pin, which means INA326 will be operated with +-5V, and the linear region of output will be widen. And the output will be linear in 0V-3.3V. Do you think this solution is okay for implement?

Thanks and Best Regards,

Hoang

  • Hello Hoang,

    I recommend using the LM7705. Please take a look at TI Precision Design TIPD129 as a reference.

    Regards,

    Pete Semig

    General Purpose Amplifier Applications

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