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REF3212 Datasheet Temperature

Other Parts Discussed in Thread: REF3212

All,

In the datasheet for the REF3212 under absolute maximums it mentions an operating temperature of -55 to +135C, but everywhere else on the website and in the beginning of the datasheet mentions a temperature range of -40 to +125C. Can you clarify on which is correct?

  • Reagan, 

    There is an essential difference between operating and specified temperature range; operating temperature range of -55C to 135C means only that the part will function as intended (look like a voltage reference) BUT the max/min datasheet (PDS) specifications may NOT be met; in the case of specified temperature range of -40C to 125C, all the PDS specs over temperature should be met. 

    BTW, operating REF3212 above 135C or below -55C may cause a permanent damage to IC - see below note (1) while exposure to absolute maximum rated conditions  for an extended period of time may degrade the device performance and shorten its functional life.

  • Marek,

    On this device, instead of seeing the 1.25V +/- 0.0025V output, we're seeing some results up to 1.4-1.42V @ -41C. Per your answers above, this doesn't seem like it should be happening. What would your thoughts be here?

    The test scenario is with a simple breadboard setup with the schematic below, and per the datasheet requirements, a rise time of 5000V/s on the input voltage. That last note is per the <2ms rise time requirement mentioned in the datasheet for when IN and EN are tied together. 

  • Reagan,

    C1 capacitor (as shown in the REF32xx schematic above) may only be needed for supply voltage rise time longer than 2ms; since you state IN pin voltage rise is greater than 5000V/s (t<2ms), please remove the C1 capacitor since it should NOT be needed but it may cause other issues especially at cold temperature.