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AD9219 Clock Sources

lukeabela38
on Dec 17, 2019

Good day,

I am currently developing a board based on the AD9219, and am seeking to design a clock input. Could the clock be provided by a low jitter analogue sine wave? or must be the clock be digital?

Regards,

Luke

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    •  Analog Employees 
    on Dec 17, 2019 3:32 PM

    Hi, 

    We often use a sine source to clock our high-speed ADCs.  You will see a description of that recommendation on page 37, and on page 41 there is a schematic of how we use a transformer and some Schottky diodes to transform to a differential signal and clip the sine source.   This preserves the high slew rate portion of the sine input without overdriving the clock input, thereby providing a low jitter clock to the ADC.  

    Good luck with your design, 

    David

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    •  Analog Employees 
    on Dec 17, 2019 3:32 PM

    Hi, 

    We often use a sine source to clock our high-speed ADCs.  You will see a description of that recommendation on page 37, and on page 41 there is a schematic of how we use a transformer and some Schottky diodes to transform to a differential signal and clip the sine source.   This preserves the high slew rate portion of the sine input without overdriving the clock input, thereby providing a low jitter clock to the ADC.  

    Good luck with your design, 

    David

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