ADS7863
www.ti.com
SBAS383–JUNE 2007
PSEUDO-DIFFERENTIAL MODE I
(Not ADS7861-Compatible)
For more details, see the Serial Data Input section.
Data are available on both output terminals, SDOA
and SDOB.
In Mode I, the ADS7863 input multiplexers can also
operate in a pseudo-differential manner. In this case,
SDI bits C[1:0] are used to choose the channels
accordingly.
The input multiplexer cannot be used for
pseudo-differential signals in Mode III or Mode IV.
16
1
16
1
16
1
16
1
16
1
1
1
CLOCK
CONVST
SDI
C[1:0] = '00' ® CHx0+/CHx0- C[1:0] = '01' ® CHx1-/CHx0- C[1:0] = '10' ® CHx1+/CHx0- C[1:0] = '00' ® CHx0+/CHx0- C[1:0] = '01' ® CHx1-/CHx0- C[1:0] = '10' ® CHx1+/CHx0-
P[1:0] = '00' ® Features OFF
P[1:0] = '11' ® Features OFF P[1:0] = '00' ® Features OFF
P[1:0] = '00' ® Features OFF
P[1:0] = '11' ® Features OFF
P[1:0] = '00' ® Features OFF
M0
M1
RD
CS
12-Bit Data
12-Bit Data
12-Bit Data
12-Bit Data
12-Bit Data
Previous 12-Bit
Data CHAx
SDOA
CHA0+/CHA0-
CHA1-/CHA0-
CHA1+/CHA0+
CHA0+/CHA0-
CHA1-/CHA0-
12-Bit Data
12-Bit Data
12-Bit Data
12-Bit Data
12-Bit Data
Previous 12-Bit
Data CHBx
SDOB
BUSY
CHB0+/CHB0-
CHB1-/CHB0-
CHB1+/CHB0+
CHB0+/CHB0-
CHB1-/CHB0-
Conversion of Both
Conversion of Both
Conversion of Both
Conversion of Both
Conversion of Both
Previous Conversion
of Both CHxx
CHx0+/CHx0-
CHx1-/CHx0-
CHx1+/CHx0-
CHx0+/CHx0-
CHx1-/CHx0-
0ms
0.5ms
1.0ms
1.5ms
2.0ms
2.5ms
3.0ms
Figure 22. Pseudo-Differential Mode I (M0 = 0; M1 = 0)
20
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