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TLV3502: Input offset voltage vs. overdrive voltage

Ray Vincent Aranzaso
Genius 17150 points
Part Number: TLV3502

Hi,

Good Day. My customer is considering using TLV3502 in a new design, and he found the specified input offset voltage max is +/-6.5mV, while the specified overdrive voltage can be 5mV(less than 6.5mV). Seems these two parameter is conflict with each other? His understanding is V_OD should be >= Vos to steadily flip the output, right? if not, could you help clarify? Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Guru 55056 points

    Hi Ray,

    The prop delay specification does include offset contributions. You must cross the set reference voltage plus offset.

    When testing at the mV overdrive levels, we have to adjust for the offset.

    So you need to measure the offset first, then adjust for it when setting the prop delay input levels, so that the overdrive is correct over the threshold.

    So the effects of offset must be taken into account when driving at low (<10mV) levels, as that may affect the prop delay and phase.