ISL55004IBZ-T7 Intersil, ISL55004IBZ-T7 Datasheet - Page 11

• Manufacturer Part Number: ISL55004IBZ-T7
• Description: IC OPAMP 200MHZ UNITYGAIN 14SOIC
• Manufacturer: Intersil

Specifications of ISL55004IBZ-T7

• Amplifier Type: Voltage Feedback
• Number Of Circuits: 4
• Slew Rate: 300 V/µs
• Gain Bandwidth Product: 70MHz
• -3db Bandwidth: 200MHz
• Current - Input Bias: 600nA
• Voltage - Input Offset: 1200µV
• Current - Supply: 8.5mA
• Current - Output / Channel: 140mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 30 V, ±2.25 V ~ 15 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Other names: ISL55004IBZ-T7TR

Differential Output Instrumentation Amplifier
The addition of a third amplifier to the conventional three
amplifier instrumentation amplifier introduces the benefits of
differential signal realization, specifically the advantage of
using common-mode rejection to remove coupled noise and
ground potential errors inherent in remote transmission. This
configuration also provides enhanced bandwidth, wider
output swing and faster slew rate than conventional three
amplifier solutions with only the cost of an additional
amplifier and few resistors.
e
2
e
1
FIGURE 30. DIFFERENTIAL OUTPUT AMPLIFIER
R
G
R
R
+
+
-
-
A
A
2
2
2
1
V
0V
5
R
+
R
-
3
3
R
R
3
1kΩ
VARIABLE SUBJECT
3
R
11
15
TO STRAIN
1kΩ
1kΩ
R
+
+
-
-
R
R
R
A
A
3
3
1kΩ
3
3
R
3
4
16
REF
+
-
e
e
e
o
o
o
3
4
FIGURE 31. STRAIN GAUGE
R
R
17
18
ISL55004
1kΩ
1kΩ
1kΩ
BW
Strain Gauge
The strain gauge is an ideal application to take advantage of
the moderate bandwidth and high accuracy of the ISL55004.
The operation of the circuit is very straightforward. As the
strain variable component resistor in the balanced bridge is
subjected to increasing strain, its resistance changes,
resulting in an imbalance in the bridge. A voltage variation
from the referenced high accuracy source is generated and
translated to the difference amplifier through the buffer
stage. This voltage difference as a function of the strain is
converted into an output voltage.
R
e
e
F
o3
o
=
+
-
=
=
–
2f
----------------- -
–
2 1
+
-
V+
V-
+
-
A
(
(
C1 2
1nF
1nF
1
C
V
5V
V
5V
Di
C
12
2
4
+
6
+
,
2R
2R
2
2
⁄
⁄
R
R
A
G
G
Di
) e
) e
R
1kΩ
(
(
L
=
1
1
–
–
–
V
(V1+V2+V3+V4)
2 1
e
e
OUT
2
(
2
)
)
+
2R
e
o4
2
⁄
R
=
G
(
)
1
+
2R
2
⁄
R
G
July 27, 2006
) e
(
FN6219.2
1
–
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2
)