Datasheet

5
4
3
2
1
0
-1
CommonVoltageRange(V)
0 0.5 1.0 1.5
2.0 2.5
V (V)
REF
Single-EndedInput
V =5V
DD
3.8
2.8
2.2
-0.3
0
0.2
5
4
3
2
1
0
-1
CommonVoltageRange(V)
0 0.5 1.0 1.5
2.0 2.5
V (V)
REF
DifferentialInput
V =5V
DD
3.8
2.75
0.95
-0.3
3.0
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0
CommonVoltageRange(V)
0.10 0.35 0.60 0.85
1.10 1.35
V (V)
REF
Single-EndedInput
1.5 1.5
1.05
-0.2
V =2.7V
DD
0.5
0.2
3.0
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0
CommonVoltageRange(V)
0 0.25 0.50 0.75
1.00 1.25
V (V)
REF
DifferentialInput
V =2.7V
DD
1.5 1.5
0.5
-0.3
0
ADS8317
www.ti.com .................................................................................................................................................... SBAS356D –JUNE 2007–REVISED OCTOBER 2009
Figure 38. Single-Ended 5V Input, Figure 40. Differential 5V Input,
Common Voltage Range vs V
REF
Common Voltage Range vs V
REF
Figure 39. Single-Ended 2.7V Input, Figure 41. Differential 2.7V Input,
Common Voltage Range vs V
REF
Common Voltage Range vs V
REF
When the input is differential, the amplitude of the In each case, care should be taken to ensure that the
input is the difference between the +IN and –IN input, output impedance of the sources driving the +IN and
or +IN – (–IN). A voltage or signal is common to both –IN inputs are matched. If this matching is not
of these inputs. The peak-to-peak amplitude of each observed, the two inputs could have different settling
input is V
REF
about this common voltage. However, times. This difference may result in offset error, gain
since the inputs are 180° out-of-phase, the error, and linearity error that change with both
peak-to-peak amplitude of the difference voltage is 2 temperature and input voltage. If the impedance
× V
REF
. The value of V
REF
also determines the range cannot be matched, the errors can be lessened by
of the voltage that may be common to both inputs, as giving the ADS8317 additional acquisition time.
shown in Figure 41 and Figure 40.
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