ADS7863
www.ti.com
SBAS383–JUNE 2007
PSEUDO-DIFFERENTIAL MODE II
(Not ADS7861-Compatible)
Channel switching is performed by setting the C[1:0]
bits in the SDI Register accordingly (see also the
Serial Data Input section).
In Mode II, the ADS7863 input multiplexers can also
operate in a pseudo-differential configuration. In this
case, output data are available on terminal SDOA
only, while SDOB is held in tri-state.
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
Every 2nd
Every 2nd
Every 2nd
CONVST
Is Ignored
CONVST
Is Ignored
CONVST
Is Ignored
C[1:0] = '00' ® CHx0+/CHx0-
P[1:0] = '00' ® Features OFF
C[1:0] = '01' ® CHx1-/CHx0-
P[1:0] = '11' ® Features OFF
C[1:0] = '10' ® CHx1+/CHx0-
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-
CHB0+/CHA0-
CHA1-/CHA0-
CHB1-/CHB0-
CHA1+/CHA0-
High-Z
Previous 12-Bit
Data CHBx
SDOB
BUSY
Conversion of Both
Conversion of Both
Conversion of Both
Previous Conversion
of Both CHxx
No Conversion,
Read Data Only
No Conversion,
Read Data Only
CHx0+/CHx0-
CHx1+/CHx0-
CHx1+/CHx0-
0ms
0.5ms
1.0ms
1.5ms
2.0ms
2.5ms
3.0ms
Figure 23. Pseudo-Differential Mode II (M0 = 0; M1 = 1)
21
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