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Re: Request the schematic review with AD9251-80 and ADA4937-1

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Hi Se-woong,

 

I am looking more at the ADC portion of the schematic. I think it looks pretty good, with the following comments/questions.

  • The CLK+/- pins are internally biased, so they should be AC coupled to the clock source. I do not see AC coupling capacitors in the schematic, for the clock.
  • The VCM pin on the AD9251 is connected directly to R328, R306, R317 and R308. This is OK. One additional thing I would consider is adding pads for additional series resistors after the fanout to channel A and channel B. These could be populated with 0Ohms initially. The intention is to give the flexibility to add some resistance for isolation between channels, if desired.

AD9251_VCM_resistors.png

 

 

  • What are the differences between this schematic and the one that was used before for the AD9251-65?
  • What is the supply voltage for the ADA4937?
  • What is the amplitude of the analog input to the ADA4937?

 

Thank you.

 

Doug


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