DDC232 Datasheet, PDF (25/28 Pages) Burr-Brown (TI) – 32-Channel, Current-Input Analog-to-Digital Converter

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RETRIEVAL: NON-CONTINUOUS MODE
Retrieving in non-continuous mode is slightly
different as compared with the continuous mode. As
illustrated in Figure 23, DVALID goes low in time
t_NCDR1 after the first integration completes. If t_INT is
shorter than this time, all of t_NCDR2 is available to
retrieve data before the other side data is ready. For
t_INT > t_NCDR1, the first integration data is ready before
the second integration completes. Data retrieval
must be delayed until the second integration
completes, leaving less time available for retrieval.
DDC232
SBAS331C – AUGUST 2004 – REVISED SEPTEMBER 2006
The time available is t_NCDR2 – (t_INT – t_NCDR1). Data
from the second integration must be retrieved before
the next round of integration begins. This time is
highly dependent on the pattern used to generate
CONV. As with the continuous mode, data retrieval
must halt before and after CONV toggles (t_SDCV) and
be completed before new data is ready (t_HDDODV).
CONV
D VALID
DC LK
DOUT
t_INT
t_{IN T}
t_INT
t_{IN T}
t_NCDR1
t_{NC DR2}
…
…
Side A
Data
…
…
Side B
Data
Figure 23. Readback in Non-Continuous Mode
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