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how is the sensitivity and potential of the trim pin of adr444

there is no specification in the datasheet.

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  • Hi Anshul,

    indeed I do not use that pin, but leave it open.

    We have Problems here with the damp heat test and I wondered, whether the trim or the testpins could be sensitive to creeping current on the pcb surface.

    Indeed it seems not so. When I cut off the pins, I still see the sensitivity of about 20ppm to humidity rising from 50 to 85% at 40°C within 8h and the reversal, when I lower the humidity. The Voltage was measured directly at pin6 of the ADR444B.

    How can I get better results? I ordered samples of ADR4540BRZ and will make the test with them.

    Do you have other suggestions?

    Regards

    wrmin

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  • Hi Anshul,

    indeed I do not use that pin, but leave it open.

    We have Problems here with the damp heat test and I wondered, whether the trim or the testpins could be sensitive to creeping current on the pcb surface.

    Indeed it seems not so. When I cut off the pins, I still see the sensitivity of about 20ppm to humidity rising from 50 to 85% at 40°C within 8h and the reversal, when I lower the humidity. The Voltage was measured directly at pin6 of the ADR444B.

    How can I get better results? I ordered samples of ADR4540BRZ and will make the test with them.

    Do you have other suggestions?

    Regards

    wrmin

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