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LTC6957-3 voltage level drop in clock input

Question asked by sachin.np on Jun 14, 2018

We are using the recommended circuit in typical application of the datasheet in page 38 for LTC6957. the 10MHz REF IN clock from source is at 3.3V level without any load. The moment we connect this 10MHz clock to our circuit the voltage is dropping to less than 1V even before the first capacitor (C649). What might be the issue? Attached is the schematics for reference

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