DDC232_15 Datasheet, PDF (25/34 Pages) Texas Instruments – 32-Channel, Current-Input Analog-to-Digital Converter

DDC232
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RETRIEVAL: NONCONTINUOUS MODE
Retrieving in Noncontinuous 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 are ready. For
t_INT > t_NCDR1, the first integration data are ready
before the second integration completes. Data
retrieval
must
be
delayed
SBAS331D – AUGUST 2004 – REVISED APRIL 2010
until the second integration completes, leaving less
time available for retrieval. 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 are ready (t_HDDODV).
CONV
D VALID
DC LK
DOUT
t_{IN T}
t_INT
t_INT
t_{IN T}
t_NCDR1
t_{NC DR2}
…
…
Side A
Data
…
…
Side B
Data
Figure 23. Readback in Noncontinuous Mode
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