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REF191 output pulldown resistors

Question asked by bremenpl on Apr 27, 2016
Latest reply on Apr 27, 2016 by bremenpl

Hello there,

I am currently working on an application where REF191 chip is used. I have a question regarding the output state of the chip when the sleep pin is grounded. The datasheet states the the output is high impedance but it doesnt say how high. This is the simplified schematic from the datasheet:

 

ref191.png

I have pointed out with red squares the resistors that pull the output down when sleep is grounded. In my application I would like to take advantage of the high impedance output and connect some series resistance to it. But if the selected resistors resistance is low enough, I might have a significant voltage drop on the resistors connected in series with the output.

So the question is, what is the resistance of those resistors? I would appreciate all help!

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