external CMOS clock of AD7134

Question

In my circuit, the clkvdd is connected to the 1.8V power supply.The circuit diagram is as follows: 
 
 Measure the voltage of XTAL2 with an oscilloscope as follows： 
 
 The maximum voltage of the input sine wave is 2.34V and the minimum voltage is -0.4V. Does the external input clock meet the requirements under this circuit?

JEstayo · Accepted Answer

Hi SunflowerF , 
 
 If the crystal oscillator is not in the specified range, the ODR may vary as well and device performance is no longer guaranteed to be within specs. In the evaluation board for AD7134, SIT1602BC-13-18S-48.000000G was used.

Thanks, Janine)

JEstayo · Answer

Hi SunflowerF , 
 The minimum voltage high is 0.65 x CLKVDD = 0.65 x 1.8V = 1.17 V, while the maximum voltage low is 0.35 x CLKVDD = 0.35 x 1.8V = 0.63 V. 
 The voltage of the input sine wave should be okay but kindly check the frequency as it seems like the frequency is at 48.31MHz, while the maximum frequency specified in the datasheet is 48.1MHz. 
 
 Thanks, 
 Janine

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external CMOS clock of AD7134