LTC6957-2 output are sinewave

Question

Hi Team, 
 I am trying to drive my LTC6957-2 with a 2v sinewave originated from an OCXO. 
 for some reason I get sinewave and not square wave at the output pins. the levels are LVDS levels but the shape is a sinewave. 
 I tried to load it with 100Ohm resistor as well as with ADCLK944 evalboard set LVDS input. 
 I am using the eval board for LTC6957. 
 what can be the issue? is it expecting a square wave input?

ChrisPearson · Accepted Answer

HI, 
 Something is definitely wrong with your setup or the part. The LVDS edges should have 170ps rise time, with either a sine wave or square wave input. 
 Can you describe your setup? What frequency is the OCXO? What are you FILTA/B settings? 
 Are you measuring the output with 100 ohm differential probe? Or with a single ended probe terminated at 50 ohms? If single ended, how is the unused output terminated? 
 Can you send a picture of your setup? 
 What supply current are you measuring? 
 Thanks 
 Chris)

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LTC6957-2 output are sinewave