INA155EA BURR-BROWN [Burr-Brown Corporation], INA155EA Datasheet - Page 9

• Manufacturer Part Number: INA155EA
• Description: Single-Supply, Rail-to-Rail Output, CMOS INSTRUMENTATION AMPLIFIER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

FIGURE 1. Basic Connections.
APPLICATIONS INFORMATION
Figure 1 shows the basic connections required for operation
of the INA155. Applications with noisy or high impedance
power supplies may require decoupling capacitors close to
the device pins as shown.
The output is referred to the output reference terminal, Ref,
which is normally set to V
ance connection to ensure good common-mode rejection. A
resistance of 200
typical device to degrade to approximately 80dB CMRR.
In addition, for the G = 50 configuration, the connection
between pins 1 and 8 must be low-impedance. A connection
impedance of 20
FIGURE 2. Single-Supply Bridge Amplifier.
Single Supply
0.1 F
Ref
V
V
(2)
IN
IN
–
+
5
2
3
Sensor
Bridge
7
200k
can cause a 0.2% shift in gain error.
V+
INA155
in series with the Ref pin will cause a
4
V–
1
S
/2. This must be a low-imped-
V
V
5k
IN
IN
+
–
0.1 F
+5V
Dual Supply
Gain Pins Connected:
External Resistor R
22.2k
A1
Gain Pins Open:
10 < G < 50
G = 50
G = 10
1
8
3
2
INA155
V
5
REF
22.2k
(1)
G
:
7
4
6
8
5k
200k
A2
V
OUT
9
= 0.01V to 4.99V
NOTES: (1) V
keeping in mind that the value of V
input range. See Typical Performance Curve. (2) For best
performance, the common-mode input voltage should be kept away
from the transition range of (V+) – 1.8V to (V+) –0.8V.
OPERATING VOLTAGE
The INA155 is fully specified and guaranteed over the supply
range +2.7V to +5.5V, with key parameters guaranteed over
the temperature range of –55 C to +125 C. Parameters that
vary significantly with operating voltages, load conditions or
temperature are shown in the Typical Performance Curves.
The INA155 can be operated from either single or dual
power supplies. By adjusting the voltage applied to the
reference terminal, the input common-mode voltage range
and the output range can be adjusted within the bounds
shown in the Typical Performance Curves. Figure 2 shows
a bridge amplifier circuit operated from a single +5V power
supply. The bridge provides a relatively small differential
voltage on top of an input common-mode voltage near 2.5V.
6
V
REF
OUT
should be adjusted for the desired output level,
= (V
IN
+
V
V
– V
IN
IN
+
–
IN
–
) • G + V
DESIRED GAIN
Also drawn in simplified form:
REF
(V/V)
3
1
8
2
G = 10 +
REF
10
20
30
40
50
affects the common-mode
INA155
INA155
V–
V+
4
10k + R
7
400k
Ref
5
6
Open
G
Short
3.3k
30k
10k
R
( )
G
V
OUT
®