ADS7863
www.ti.com
SBAS383–JUNE 2007
MODE III
Output data consist of a channel indicator ('0' for
CHx0 or '1' for CHx1), followed by a '0', 12 bits of
conversion results, and another '00'.
With M0 set to '1' and M1 = 0, the ADS7863
automatically cycles between the multiplexer inputs
(ignoring the SDI pin) while offering the conversion
result of CHAx on SDOA and the conversion result of
CHBx on SDOB (see Figure 18).
1
16
1
16
CLOCK
CONVST
SDI
C[1:0] is ignored
P[1:0] = ‘00’ ® SDI features are not used
C[1:0] is ignored
P[1:0] = ‘11’ ® SDI features are not used
C[1:0] is ignored
P[1:0] = ‘11’ ® SDI features are not used
Both channel 0s are converted first,
followed by conversion of both channel 1s.
M0
M1
RD
CS
CH1
SDOA
Previous 12-Bit Data CHAx
CH0
CH0
12-Bit Data CHA0
12-Bit Data CHA1
CH1
SDOB
BUSY
Previous 12-Bit Data CHBx
Previous 12-Bit Data CHB0
Conversion of Both CHx0
Previous 12-Bit Data CHB1
Conversion of Both CHx1
Previous Conversion of Both CHxx
0ms
0.5ms
1.0ms
Figure 18. Mode III Timing Diagram (M0 = 1; M1 = 0)
16
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