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Why use another FDA (ADA4954-1) in CN0535 as LTC6373 has capability to drive ADC too?

Category: Hardware
Product Number: LTC6373, ADA4954-1, AD7768-1


In the reference design CN0535, between the LTC6373 and AD7768-1, there is another FDA. As PGIA 6373 has differential output too, why use the ADA4954-1 here? Only for the AAF?


  • Hello,

    I have discussed this with one of the hardware designers of this reference design. You are right that it is possible for the LTC6373 to directly drive the AD7768-1 input however, this was not evaluated in the design. The ADA4954-1 was primarily designed for AAF to attenuate frequencies around the sample rate.

    Best Regards,