Datasheet

2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
2 4 6 8
10 12 14 16 18 20 22
V
OUT
(V)
V
SENSE
(mV)
24
INA195, INA198 V
OUT
Tested Limit
(1)
V
CM2
V
CM3
V
CM4
V
CM2
, V
CM3
, and V
CM4
illustrate the variance
from part to part of the V
CM
that can cause
maximum V
OUT
with V
SENSE
< 20mV.
V
OUT
tested limit at
V
SENSE
= 0mV, 0
≤
V
CM1
≤
V
S.
NOTE: (1) INA193, INA196 V
OUT
Tested Limit = 0.4V.
INA194, INA197 V
OUT
Tested Limit = 1V.
Ideal
V
CM1
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
2
4 6 8 10 12 14 16 18
V
OUT
(V)
V
SENSE
(mV)
20
Actual
Ideal
INA193A-EP
SBOS400A –MAY 2007–REVISED SEPTEMBER 2013 www.ti.com
Figure 2. Example for Low V
SENSE
Cases 1 and 3
(INA195A, INA198A: Gain = 100)
Low V
SENSE
Case 2: V
SENSE
< 20 mV, 0 V ≤ V
CM
≤ V
S
This region of operation is the least accurate for the INA193A. To achieve the wide input common-mode voltage
range, these devices use two op amp front ends in parallel. One op amp front end operates in the positive input
common-mode voltage range, and the other in the negative input region. For this case, neither of these two
internal amplifiers dominates and overall loop gain is very low. Within this region, V
OUT
approaches voltages
close to linear operation levels for Normal Case 2. This deviation from linear operation becomes greatest the
closer V
SENSE
approaches 0 V. Within this region, as V
SENSE
approaches 20 mV, device operation is closer to that
described by Normal Case 2. Figure 3 illustrates this behavior for the INA195A. The V
OUT
maximum peak for this
case is tested by maintaining a constant V
S
, setting V
SENSE
= 0 mV and sweeping V
CM
from 0 V to V
S
. The exact
V
CM
at which V
OUT
peaks during this test varies from part to part, but the V
OUT
maximum peak is tested to be less
than the specified V
OUT
tested limit.
Figure 3. Example for Low V
SENSE
Case 2
(INA195A, INA198A: Gain = 100)
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