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Tailoring the AD7173-8 ADC input range

Question asked by jfitzger131 on Aug 10, 2015
Latest reply on Oct 1, 2015 by jfitzger131

I would like to take full advantage of the ADC's input range while using the internal buffers.

I have configured the ADC to run from a single +3.3V supply.

If the internal buffers are turned on, the absolute analog input range become 0 to 2.2V.

If I use a 1.1V external reference, the ADC range will match the absolute analog input range.

 

I don't think I want to use a resistor divider off of the ADR441 to create a 1.1V reference.

Should I buffer this signal with an amplifier for the reference?

 

- James

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