how to connect REF_SEL of AD9516-3 when the REFIN is differential pair?

hello,

Recently I make the AD9516-3 to output 1G ,250M and 200M from the REF_SEL 200MHz. I plan to connect the REF_SEL of AD9516-3 to 200M difference clock from external chip.but How do I connect the REF_SEL? The datasheet only tells me about REF_SEL that select REF1(low) or REF2(high),what about differential pair REF1IN? thanks.

                                                                                                                                                                                                                                                                                                Best wishes.

                                                                                                                                                                                                                                                                                                yours

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  • 0
    •  Analog Employees 
    on Dec 2, 2019 4:16 PM

    It appears that you want to send in a 2nd reference on the Ref_Sel pin.  This is not possible.  The AD9516 only supports a differential input OR 2 single-ended inputs.  Ref_Sel can be used to manually select the preferred single-ended input.  Ref_Sel is not an additional reference input. 

    For multiple differential reference inputs, consider the AD9523 family.

    Please clarify your requirement if my assumptions on how you want to use Ref_Sel are not correct.

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  • 0
    •  Analog Employees 
    on Dec 2, 2019 4:16 PM

    It appears that you want to send in a 2nd reference on the Ref_Sel pin.  This is not possible.  The AD9516 only supports a differential input OR 2 single-ended inputs.  Ref_Sel can be used to manually select the preferred single-ended input.  Ref_Sel is not an additional reference input. 

    For multiple differential reference inputs, consider the AD9523 family.

    Please clarify your requirement if my assumptions on how you want to use Ref_Sel are not correct.

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