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ADS1274 Drdy SPI Mode not always working

Other Parts Discussed in Thread: ADS1274

  I have been having some difficulty with getting my ADS1274 itnerfaced with my microcontroller.  The ADC is setup in SPI-mode (Dynmaic: 000).  According to the data sheet I expect to see the Drdy line pulse low and stay low until either it receives the first clock or the next sample is ready.  Unfortunately, sometimes I am getting this behavior, and sometimes it seems like the DRdy line just momentarily pulses and immediately returns back to its previous level.  Attached is a oscilloscope trace of what I am observing.  Can anybody tell me why the Drdy doesn't seem to be behaving properly to specification?