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ADS5296A: Sample order in interleaved mode

user5959173
Prodigy 40 points
Part Number: ADS5296A

In interleaved mode, two adjacent LVDS output streams deliver simultaneously the values of two successive samples.  According to Figure 82 of the data sheet "Interleaving Mode Latency Timing Diagram", the lower-numbered output stream (e.g., OUT1) delivers the earlier sample (N), and the higher-numbered stream (e.g., OUT2) delivers the next sample (N+1).  However, we very clearly observe the opposite in our tests:  The higher-numbered output has the earlier sample, and the lower-numbered output has the next one.

Could the data sheet be wrong on this point?  Might we be inadvertently operating in an obscure mode in which the order is reversed?

--Larry

  • 0
    TI__Expert 4661 points

    Are you applying SYNC pulse to synchronize the device? Refer to the section "SYNCHRONIZATION USING THE SYNC PIN". If SYNC signal is not applied then the observation you are having is possible and it can change from device to device.

    Thanks!

    Regards,

    Shabbir

  • 0 in reply to Shabbir Amjhera Wala
    Prodigy 40 points

    Shabbir,

    Yes, we are certainly applying the SYNC pulse.  It's working, since it produces the expected effect of synchronizing all the channels within a device as well as synchronizing across the multiple devices that we have.  Even after SYNC, the order of samples in interleaved mode is as I described:  the higher-numbered output has the earlier sample.

    However, the data sheet strongly implies that SYNC should not affect the order of samples within a single channel -- i.e., between the two output streams of the same channel in interleaved mode.  It should affect only the synchronization among channels.

    Regards,

    Larry