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TMP36 easily be impacted by RFI?

Question asked by phychem on Apr 26, 2012
Latest reply on May 8, 2012 by jtowey

Hi,

 

I used a TMP36 as temperature sensor. The chip was mounted on an aluminium block using glue.  However I found it is very easily to be drifted by something, such as when I put my fingers closed to the wires (about 2 inches), and the value is different when the case is open or closed.

 

Bypass caps, bead, R/C filter on Vcc, have little improvements. adding a 1kohm resistor between the output and ground stabilizes the output, but according to the datasheet the 1kohm load is too much for the device.

 

I tested the AD22100 and it has no such problem.

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