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The MC100LVEL40 is a phase/frequency detector intended for haselocked loop applications which require a minimum amount of hase and frequency difference at lock. The device is a basic three state hase detector with differential inputs and outputs. The device is esigned to work from either a 3.3V or 5.0V power supply.
When the reference (R) and the feedback (FB) inputs are unequal in requency and/or phase the differential up (U) and down (D) outputs will rovide pulse streams which when subtracted and integrated provide an rror voltage for control of a VCO.