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ADS54J40: about LVPECL input amplitude

Part Number: ADS54J40
Other Parts Discussed in Thread: LMK04828


I desghined like a below figure.
Received clock Amplitude between PN pin is about 900mV(frequency is 737.28MHz)
LMK04828 outputs LVPECL 1600mV when I removed both ac-coupled capacitor.
Would you please teach me why amplitude reduced?

Thank you