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LM91002 reference voltage

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Dear Forum memers

Could you please comment on the following?

Using a LMP91002 with a supply voltage of 3.3V what would the ideal external reference voltage be assuming the use of a 3 terminal Electrochemical cell.

The typical ADC resolution will be 12 bit but we might consider 14-16 bit

The TI "Gas sensor reference design" uses 2.5V external reference and a 5V nominal supply, would a reference set to 1/2 of the supply voltage,would it be a good starting point or is there more to consider?

Regards


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