INA131
Precision G = 100
INSTRUMENTATION AMPLIFIER
DESCRIPTION
The INA131 is a low cost, general purpose G = 100
instrumentation amplifier offering excellent accuracy.
Its 3-op amp design and small size make it ideal for
a wide range of applications.
On-chip laser trimmed resistors accurately set a fixed
gain of 100. The INA131 is laser trimmed to achieve
very low offset voltage (50
V max), drift (0.25
V/
C
max), and high CMR (110dB min). Internal input
protection can withstand up to
40V inputs without
damage.
The INA131 is available in a 8-pin plastic DIP. They
are specified over the 40
C to +85
C temperature
range.
FEATURES
q
LOW OFFSET VOLTAGE: 50
V max
q
LOW DRIFT: 0.25
V/
C max
q
LOW INPUT BIAS CURRENT: 2nA max
q
HIGH COMMON-MODE REJECTION:
110dB min
q
INPUT OVERVOLTAGE PROTECTION:
40V
q
WIDE SUPPLY RANGE:
2.25 to
18V
q
LOW QUIESCENT CURRENT: 3mA
q
8-PIN PLASTIC DIP
APPLICATIONS
q
BRIDGE AMPLIFIER
q
THERMOCOUPLE AMPLIFIER
q
RTD SENSOR AMPLIFIER
q
MEDICAL INSTRUMENTATION
q
DATA ACQUISITION
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
Over-Voltage
Protection
A
1
A
2
A
3
6
25k
5k
25k
25k
25k
5k
7
4
3
8
1
2
V
IN
V
IN
V+
V
INA131
DIP
Ref
V
O
= 100 (V
IN
V
IN
)
+
+
5
2.63k
Over-Voltage
Protection
INA131
1992 Burr-Brown Corporation
PDS-1144E
Printed in U.S.A. March, 1998
SBOS016
INA131
2
SPECIFICATIONS
At T
A
= +25
C, V
S
=
15V, R
L
= 2k
, unless otherwise noted.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
T
Specification same as INA131BP.
NOTES: (1) R
L
= 10k
. (2) Absolute value of internal gain-setting resistors. (Gain depends on resistor ratios.)
INA131BP
INA131AP
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
INPUT
Offset Voltage, RTI
Initial
T
A
= +25
C
10
50
25
125
V
vs Temperature
T
A
= T
MIN
to T
MAX
0.1
0.25
0.25
1
V/
C
vs Power Supply
V
S
=
2.25V to
18V
0.5
3
T
T
V/V
Long-Term Stability
0.2
T
V/mo
Impedance, Differential
10
10
|| 6
T
|| pF
Common-Mode
10
10
|| 6
T
|| pF
Input Common-Mode Range
11
13.5
T
T
V
Safe Input Voltage
40
T
V
Common-Mode Rejection
V
CM
=
10V,
R
S
= 1k
110
120
106
110
dB
BIAS CURRENT
0.5
2
T
5
nA
vs Temperature
8
T
pA/
C
OFFSET CURRENT
0.5
2
T
5
nA
vs Temperature
8
T
pA/
C
NOISE VOLTAGE, RTI
R
S
= 0
f = 10Hz
16
T
nV/
Hz
f = 100Hz
12
T
nV/
Hz
f = 1kHz
12
T
nV/
Hz
f = 10kHz
12
T
nV/
Hz
f
B
= 0.1Hz to 10Hz
0.4
T
Vp-p
Noise Current
f = 10Hz
0.4
T
pA/
Hz
f= 1kHz
0.2
T
pA/
Hz
f
B
= 0.1Hz to 100Hz
18
T
pAp-p
GAIN
Gain Error
(1)
0.01
0.024
T
0.1
%
Resistor Value
(2)
10
40
T
T
%
Gain vs Temperature
5
10
T
20
ppm/
C
Nonlinearity
0.0003
0.002
T
0.004
% of FSR
OUTPUT
Voltage
I
O
= 5mA, T
MIN
to T
MAX
13.5
13.7
T
T
V
V
S
=
11.4V, R
L
= 2k
10
10.5
T
T
V
V
S
=
2.25V, R
L
= 2k
1
1.5
T
T
V
Load Capacitance, max
Stable Operation
1000
T
pF
Short Circuit Current
+20/15
T
mA
FREQUENCY RESPONSE
Bandwidth, 3dB
70
T
kHz
Slew Rate
V
O
=
10V
0.3
0.7
T
T
V/
s
Settling Time, 0.01%
100
T
s
Overload Recovery
50% Overdrive
20
T
s
POWER SUPPLY
Voltage Range
2.25
15
18
T
T
T
V
Current
V
IN
= 0V
2.2
3
T
T
mA
TEMPERATURE RANGE
Specification
40
85
T
T
C
Operating
40
125
T
T
C
JA
100
T
C/W
INA131
3
PIN CONFIGURATION
Top View
P-Package/8-Pin DIP
R
G
V
IN
V
+
IN
V
R
G
V+
V
O
Ref
1
2
3
4
8
7
6
5
PACKAGE/ORDERING INFORMATION
PACKAGE
DRAWING
TEMPERATURE
PRODUCT
PACKAGE
NUMBER
(1)
RANGE
INA131AP
8-Pin Plastic DIP
006
40
C to +85
C
INA131BP
8-Pin Plastic DIP
006
40
C to +85
C
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
Supply Voltage ..................................................................................
18V
Input Voltage Range ..........................................................................
40V
Output Short Circuit (to ground) .............................................. Continuous
Operating Temperature .................................................. 40
C to +125
C
Storage Temperature ..................................................... 40
C to +125
C
Junction Temperature .................................................................... +150
C
Lead Temperature (soldering 10s) .............................................. +300
C
NOTE: (1) Stresses above these ratings may cause permanent damage.
ABSOLUTE MAXIMUM RATINGS
(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with ap-
propriate precautions. Failure to observe proper handling and
installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
INA131
4
TYPICAL PERFORMANCE CURVES
At 25
C, V
S
=
15V, unless otherwise noted.
GAIN vs FREQUENCY
Frequency (Hz)
Gain (dB)
100
1k
100k
1M
10M
10k
60
40
20
0
20
COMMON-MODE REJECTION vs FREQUENCY
Frequency (Hz)
Common-Mode Rejection (dB)
10
100
10k
100k
1M
1k
140
120
100
80
60
40
20
0
INPUT COMMON-MODE VOLTAGE RANGE
vs OUTPUT VOLTAGE
Output Voltage (V)
Common-Mode Voltage (V)
15
10
0
5
15
5
15
10
5
0
5
10
15
10
Limited by A
2
Output Swing
V
D/2
+
+
V
CM
V
O
V
D/2
Limited by A
1
Output Swing
Limited by A
1
+ Output Swing
A
3
+ Output
Swing Limit
Limited by A
2
+ Output Swing
A
3
Output
Swing Limit
POWER SUPPLY REJECTION
vs FREQUENCY
Frequency (Hz)
Power Supply Rejection (dB)
10
100
10k
1M
1k
140
120
100
80
60
40
20
0
100k
Positive Supply
Positive Supply
Positive Supply
Positive Supply
Negative Supply
INPUT- REFERRED NOISE VOLTAGE
vs FREQUENCY
Frequency (Hz)
Input-Referred Noise Voltage (nV/
Hz)
1
10
1k
100
100
10
1
10k
OFFSET VOLTAGE WARM-UP vs TIME
Time from Power Supply Turn-on (s)
Offset Voltage Change (V)
0
6
4
2
0
2
4
6
15
30
45
60
75
90
105
120
INA131
5
TYPICAL PERFORMANCE CURVES
(CONT)
At 25
C, V
S
=
15V, unless otherwise noted.
SLEW RATE vs TEMPERATURE
Slew Rate (V/s)
75
1.2
1.0
0.8
0.6
0.4
0.2
125
Temperature (C)
50
25
0
25
50
75
100
OUTPUT CURRENT LIMIT vs TEMPERATURE
Short Circuit Current (mA)
40
30
25
20
15
10
85
Temperature (C)
15
10
35
60
+|I
CL
|
|I
CL
|
QUIESCENT CURRENT vs TEMPERATURE
Quiescent Current (mA)
75
2.8
2.6
2.4
2.2
2.0
1.8
125
Temperature (C)
50
25
0
25
50
75
100
INPUT BIAS AND INPUT OFFSET CURRENT
vs TEMPERATURE
Temperature (C)
Input Bias and Input Offset Current (nA)
40
2
1
0
1
2
15
10
35
60
85
I
B
I
OS
INPUT BIAS CURRENT
vs INPUT VOLTAGE
Differential Overload Voltage (V)
Input Bias Current (mA)
45
3
2
1
0
1
2
3
30
15
0
15
30
45
Differential Mode
Common-Mode
(|I
B1
| + |I
B2
|)
MAXIMUM OUTPUT SWING vs FREQUENCY
Peak-to-Peak Amplitude (V)
10
32
28
24
20
16
12
8
4
0
100
10k
1M
Frequency (Hz)
100k
1k
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