Datasheet

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CM +V
REF
+V
REF
−
V
REF
Single−Ended Inputs
t
+IN
CM Voltage
CM
−
V
REF
CM +1/2V
REF
Differential Inputs
NOTES: Common−Mode Voltage (Differential Mode) = , Common−Mode Voltage (Single−Ended Mode) = IN
−
.
(IN+)
−
(IN
−
)
2
The maximum differential voltage between +IN and
−
IN of the ADS7864 is V
REF
. See Figures 21 and 22 for a further
explanation of the common voltage range for single−ended and differential inputs.
t
+IN
−
IN
CM Voltage
CM
−
1/2V
REF
−
IN = CM Voltage
+V
REF
−
V
REF
1.0 1.5
1.2
2.0 2.5
2.6
3.0
V
REF
(V)
Common Voltage Range (V)
−
1
0
1
2
3
4
5
2.7
2.3
4.1
0.9
V
CC
= 5V
Single−Ended Input
Differential Input
1.0 1.5
1.2
2.0 2.5
2.6
3.0
V
REF
(V)
Common Voltage Range (V)
−
1
0
1
2
3
4
5
4.7
0.3
V
CC
= 5V
4.05
0.90
ADS7864
SBAS141A – SEPTEMBER 2000 – REVISED MARCH 2005
Figure 20. Using the ADS7864 in the Single-Ended and Differential Input Modes
Figure 21. Single-Ended Input: Common-Mode Voltage Figure 22. Differential Input: Common-Mode
Range vs V
REF
Voltage Range vs V
REF
12