Difference between ADAU1328 and AD1938

I´m working on a project where I initially wanted to use the AD1938. Because of inavailability I was looking for alternatives and found the ADAU1328, which seems to be pretty much the same as AD1938.

My questions are:
- Are there any differences between AD1938 and ADAU1328?
- if not, is it possible to switch between AD1938 and ADAU1328 in case one of them is not available?

Thanks and best regards


  • 0
    •  Analog Employees 
    on Oct 15, 2021 8:32 PM

    Hello Josef,

    Besides the obvious from the block diagram the ADAU1328 only has two ADCs. The pinout shows two others but those are not tested and not guaranteed. Otherwise, yes you can drop them into a design for the AD1938 and they will work. The register set is the same and the pinout is the same. 

    If you are only using two of the ADCs on the AD1938 then no issues at all. If you are using all four then there is no guarantee that the additional two function or meet specifications since they are not tested. 

    Dave T

  • Hi Dave,

    thanks for your quick reply.

    What are the two differences in pinout? If it is the SPI pins, I don´t see a difference. It is only the names of the pins. Functionality should be the same regarding SPI and standalone mode.

    I also don´t understand the difference in ADCs. Both codecs are in 2 x stereo-pair configuration. I cannot find any difference in the description regarding the functionality of the ADCs. How can ADAU1328 with 2 ADCs do the same job as AD1938 with 4 ADCs?

    Maybe I am missing something, but in my eyes both codecs have the same functionality. So why do both exist? As I already said I would like to have one of them for backing up the other IC, so I wanna be very sure about the possibility to do so.

    Thanks for your help and best regards