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TSUP on MM912J637

Question asked by Ian Wilson on Jun 5, 2013
Latest reply on Jun 18, 2013 by Tomas Vaverka

Hello all,

 

The MM912J637 has a low current voltage output intended to drive an external temperature sensor, TSUP, as well as a dedicated ADC.

 

The specs for TSUP show a +/-5% variation around the nominal 1.25V.

 

I am wondering if I need to account for this voltage tolerance in my temperature accuracy calculations *or* if the TSUP voltage is related to the ADC's VREF.

 

So, in effect my question is, is the ADC doing a ratiometric or absolute measurement on the voltage at VTEMP.

 

How closely does TSUP track VREF is probably the most telling specification (and is not in the datasheet)?

 

Thanks,

Ian

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