1
16
CLOCK
CONVST
A0
M1 = 1 and 1st CONVST
Conversion
M1 = 1 and 2nd CONVST
No Conversion
M1 = 1 and 1st CONVST
Conversion
M1 = 1 and 2nd CONVST
No Conversion
Conversion of Chx
A0 HIGH
A0 LOW
Next Conversion Ch0
A0 LOW
Next Conversion Ch0
Next Conversion Ch1
M1 HIGH
M1
RD
Only Serial Data A Used as Output Starting with 1st Conversion
RD Connected with CONVST
CS LOW Output Active
CS
C
h
A
C
h
B
C
h
A
C
h
B
SERIAL
DATA A
12-Bit Data of ChAx
12-Bit Data of ChBx
M1 = 1 and 1st CONVST
Data of ChA
M1 = 1 and 2nd CONVST
Data of ChB
M1 = 1 and 1st CONVST
Data of ChA
M1 = 1 and 2nd CONVST
Data of ChB
M1 = 1 Serial Data B in Tri-state
SERIAL
DATA B
Conversion of Chx
M1 = 1 and 1st CONVST
Conversion
M1 = 1 and 2nd CONVST
No Conversion
M1 = 1 and 1st CONVST
Conversion
M1 = 1 and 2nd CONVST
No Conversion
BUSY
TIME 0
5µ
10µ
Time (seconds)
FIGURE 11. Mode II, Timing Diagram for M0 = 0 and M1 = 1.
1
16
CLOCK
CONVST
A0
4-Ch Operation and 1st Conversion Ch0
M0 = 1 A0 Ignored
4-Ch Operation and 2nd Conversion Ch1
M0
M0 = 1, 4-Ch Operation Starts with Next Conversion
RD Connected with CONVST
RD
CS
CS LOW, Output is Active
12-Bit Data of ChA0
C
h
0
C
h
1
SERIAL
DATA A
12-Bit Data of ChA1
12-Bit Data of ChB1
12-Bit Data of ChAx
C
h
0
C
h
1
SERIAL
DATA B
12-Bit Data of ChBx
12-Bit Data of ChB0
BUSY
TIME
0
1µ
2µ
3µ
4µ
5µ
6µ
Time (seconds)
FIGURE 12. Mode III, Timing Diagram for M0 = 1 and M1 = 0.
®
ADS7861
14
BB [ BURR-BROWN CORPORATION ]
