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ADS1261: Start to DRDY time

Part Number: ADS1261

Dear Sirs

My initial setup for the ADS1261 is : sample rate = 7200sps, filter = SINC3, delay to sample = 50uS, CHOP mode off, conversion = continuous, internal reference = enabled, internal reference is AVDD and AVSS, both IMUXs are connected to AINCOM, current output = 500uA from IMAG1 and 100uA from IMAG2, input pins are AIN6 for positive and AIN7 for negative, gain = 16.  Everything seem to be working OK.  In continuous sampling mode, I measure 139uS between DRDYs.  I've measured the time from the rising edge of the start pin to the fall edge of the DRDY pin (844uS).  I would of thought the time delay would have been in the 190uS range.  What do you think is going on?