DDC232_15 Datasheet, PDF (24/34 Pages) Texas Instruments – 32-Channel, Current-Input Analog-to-Digital Converter

DDC232
SBAS331D – AUGUST 2004 – REVISED APRIL 2010
RETRIEVAL BEFORE AND AFTER CONV
TOGGLES (CONTINUOUS MODE)
For the absolute maximum time for data retrieval,
data can be retrieved before and after CONV toggles.
Nearly all of t_INT is available for data retrieval.
Figure 22 illustrates how this is done by combining
the two previous methods. Pause the retrieval during
CONV toggling to prevent digital noise, as discussed
previously, and finish before the next data are ready.
The maximum number of DDC232s that can be
daisy-chained together with Format = 1 is:
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t_INT * ^ǒt_SDCV ) t_SDCV ) t ^Ǔ _HDDODV
(20 32)t_DCLK
(4)
NOTE: (16 × 32)t_DCLK is used for Format = 0.
For t_INT = 400ms and DCLK = 10MHz, the maximum
number of DDC232s is five (or seven for
Format = 0).
CONV
DVALID
DCLK
DOUT
t_INT
t_SDCV
…
…
…
…
t_INT
t_SDCV
…
t_HDDODV
…
…
…
t_INT
…
…
…
…
Side B
Data
Side A
Data
Figure 22. Readback Before and After CONV Toggles
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