Datasheet

®
INA114
10
INA114
V
IN
–
V
IN
+
OPA602
511Ω
22.1kΩ
22.1kΩ
Ref
V
O
For G = 100
R
G
= 511Ω // 2(22.1kΩ)
effective R
G
= 505Ω
100Ω
Shield is driven at the
common-mode potential.
current limit behavior. The inputs are protected even if no
power supply voltage is present.
OUTPUT VOLTAGE SENSE (SOL-16 package only)
The surface-mount version of the INA114 has a separate
output sense feedback connection (pin 12). Pin 12 must be
connected to the output terminal (pin 11) for proper opera-
tion. (This connection is made internally on the DIP version
of the INA114.)
The output sense connection can be used to sense the output
voltage directly at the load for best accuracy. Figure 5 shows
how to drive a load through series interconnection resis-
tance. Remotely located feedback paths may cause instabil-
ity. This can be generally be eliminated with a high
frequency feedback path through C
1
. Heavy loads or long
lines can be driven by connecting a buffer inside the feed-
back path (Figure 6).
FIGURE 4. Voltage Swing of A
1
and A
2
.
FIGURE 5. Remote Load and Ground Sensing. FIGURE 6. Buffered Output for Heavy Loads.
FIGURE 7. Shield Driver Circuit.
A
1
A
2
A
3
25kΩ25kΩ
25kΩ25kΩ
R
G
V+
V–
INA114
V
O
= G • V
D
G = 1 +
50kΩ
R
G
25kΩ
25kΩ
V
CM
–
G • V
D
2
V
D
2
V
D
2
V
CM
V
CM
+
G • V
D
2
Over-Voltage
Protection
Over-Voltage
Protection
INA114
R
G
V
IN
–
V
IN
+
Load
Equal resistance here preserves
g
ood common-mode re
j
ection.
C
1
1000pF
Output
Sense
Ref
Surface-mount package
version only.
INA114
R
G
V
IN
–
V
IN
+
I
L
: ±100mA
Output
Sense
Ref
Surface-mount package
version only.
OPA633
R
L
180Ω