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Inquiry about the design of the AD9258 and the ADA4937-1


My customer will use ADA4937-1 and AD9258 at repeater application.

1. Input voltage range of the Vocm pin in the ADA4937-1 is min 1.2V to max 3.8V. However, the VCM output of the AD9258 is 0.9V.

    The voltage ranges between the Vocm pin and the VCM pin do not match each other.

    Is there a problem with the optimum performance of the AD9258 when two pins are connected to each other like the example application below ?


2. The figure below shows an applicaton example in ADA4937-1 data sheet. Can we replace the AD9246 with the AD9258 ?