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DAC38J84: Is SYNCb used?

Pablo Lázaro
Prodigy 20 points
Part Number: DAC38J84

Tool/software:

In the DAC38J84 specification, it is mentioned that only JESD204B subclass 1 is supported. Since the SYNCb signal is exclusively used by subclass 2, does this mean that this signal and all related configurations are currently unused?

Additionally, in config72, bits 3:1 allow selecting the JESD204B subclass, but as i mentioned, the documentation states that only subclass 1 is supported. Does this imply that the DAC38J84 was initially designed to support all three JESD204B subclasses, but at some point, this was discontinued? For instance, were signals like SYNCb (used by subclass 2) left with no functionality in the final implementation?

I find this a bit confusing and would appreciate clarification.

  • +1
    TI__Guru* 78624 points

    Hi Pablo,

    In general, all JESD204B subclasses need the physical SYNC signal. The below sentence is not a correct understanding

    Pablo Lázaro said:
    Since the SYNCb signal is exclusively used by subclass 2, does this mean that this signal and all related configurations are currently unused?

    DAC38J84 only supports subclass 1, basically using SYSREF to synchronize the LMFS.