Hi,
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?
Thanks.
AD7768-1
Recommended for New Designs
The AD7768-1 is a low power, high performance, S-? analog-to-digital converter (ADC), with a S-? modulator and digital
filter for precision conversion...
Datasheet
AD7768-1 on Analog.com
Hi,
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?
Thanks.
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,
Nikko