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REF43 Trim pin function

Question asked by paulaei on Aug 9, 2016
Latest reply on Aug 10, 2016 by paulaei

The simplified schematic in the REF43 datasheet shows a resistor divider between the VOUT pin and GROUND pin. There is also a resistance from the TRIM pin to the middle of the resistor divider.

 

I want to calculate the worst case output voltage range when the TRIM pin is connected to the VOUT pin however the datasheet only specifies the output voltage range when the TRIM pin is left open.

 

In order to calculate the worst case output voltage range I need to know the variation of the resistances of the resistor divider and the TRIM pin resistance. Does anyone know a good rule of thumb to use for the variation of the resistances?

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