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®
INA118
INA118
INA118
Precision, Low Power
INSTRUMENTATION AMPLIFIER
FEATURES
q LOW OFFSET VOLTAGE: 50µV max
q LOW DRIFT: 0.5µV/°C max
q LOW INPUT BIAS CURRENT: 5nA max
q HIGH CMR: 110dB min
q INPUTS PROTECTED TO ±40V
q WIDE SUPPLY RANGE: ±1.35 to ±18V
q LOW QUIESCENT CURRENT: 350µA
q 8-PIN PLASTIC DIP, SO-8
APPLICATIONS
q BRIDGE AMPLIFIER
q THERMOCOUPLE AMPLIFIER
q RTD SENSOR AMPLIFIER
q MEDICAL INSTRUMENTATION
q DATA ACQUISITION
DESCRIPTION
The INA118 is a low power, general purpose instru-
mentation amplifier offering excellent accuracy. Its
versatile 3-op amp design and small size make it ideal
for a wide range of applications. Current-feedback
input circuitry provides wide bandwidth even at high
gain (70kHz at G = 100).
A single external resistor sets any gain from 1 to 10,000.
Internal input protection can withstand up to ±40V
without damage.
The INA118 is laser trimmed for very low offset voltage
(50µV), drift (0.5µV/°C) and high common-mode re-
jection (110dB at G = 1000). It operates with power
supplies as low as ±1.35V, and quiescent current is only
350µA—ideal for battery operated systems.
The INA118 is available in 8-pin plastic DIP,
and SO-8 surface-mount packages, specified for
the –40°C to +85°C temperature range.
2 Over-Voltage
VIN Protection
1
RG
8
+ 3 Over-Voltage
VIN Protection
A1
25k
25k
A2
V+
7
INA118
60k
60k
A3
60k
4
V–
60k
G = 1 + 50k
RG
6
VO
5
Ref
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
©1994 Burr-Brown Corporation
PDS-11199D
INA118Printed in U.S.A. April, 1998
®

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SPECIFICATIONS
ELECTRICAL
At TA = +25°C, VS = ±15V, RL = 10kunless otherwise noted.
INA118PB, UB
INA118P, U
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
INPUT
Offset Voltage, RTI
Initial
vs Temperature
vs Power Supply
Long-Term Stability
TA = +25°C
TA = TMIN to TMAX
VS = ±1.35V to ±18V
±10 ± 50/G
±0.2 ± 2/G
±1 ±10/G
±0.4 ±5/G
±50 ± 500/G
±0.5 ± 20/G
±5 ± 100/G
±25 ±100/G
±0.2 ± 5/G
T
T
±125±1000/G
±1 ± 20/G
±10 ±100/G
µV
µV/°C
µV/V
µV/mo
Impedance, Differential
1010 || 1
T || pF
Common-Mode
1010 || 4
T || pF
Linear Input Voltage Range
(V+) – 1 (V+) – 0.65
TT
V
(V–) + 1.1 (V–) + 0.95
TT
V
Safe Input Voltage
±40 T V
Common-Mode Rejection
VCM = ±10V, RS = 1k
G=1
80
90
73 T
dB
G = 10
97 110
89 T
dB
G = 100
107 120
98 T
dB
G = 1000
110 125
100 T
dB
BIAS CURRENT
vs Temperature
±1 ±5
±40
T ±10 nA
T pA/°C
OFFSET CURRENT
vs Temperature
±1 ±5
±40
T ±10 nA
T pA/°C
NOISE VOLTAGE, RTI
f = 10Hz
f = 100Hz
f = 1kHz
fB = 0.1Hz to 10Hz
Noise Current
f=10Hz
f=1kHz
fB = 0.1Hz to 10Hz
GAIN
Gain Equation
Range of Gain
Gain Error
Gain vs Temperature
50kResistance(1)
Nonlinearity
G = 1000, RS = 0
G=1
G = 10
G = 100
G = 1000
G=1
G=1
G = 10
G = 100
G = 1000
11
10
10
0.28
2.0
0.3
80
1 + (50k/RG)
1 10000
±0.01
±0.024
±0.02
±0.4
±0.05
±0.5
±0.5
±1
±1 ±10
±25 ±100
±0.0003
±0.001
±0.0005
±0.002
±0.0005
±0.002
±0.002
±0.01
T
T nV/Hz
T nV/Hz
T nV/Hz
T µVp-p
T pA/Hz
T pA/Hz
T pAp-p
T V/V
T V/V
T
±0.1
%
T
±0.5
%
T
±0.7
%
T ±2 %
T ±10 ppm/°C
T T ppm/°C
T
±0.002
% of FSR
T
±0.004
% of FSR
T
±0.004
% of FSR
T
±0.02
% of FSR
OUTPUT
Voltage: Positive
Negative
Single Supply High
Single Supply Low
Load Capacitance Stability
Short Circuit Current
RL = 10k
(V+) – 1
RL = 10k
(V–) + 0.35
VS = +2.7V/0V(2), RL = 10k
1.8
VS = +2.7V/0V(2), RL = 10k
60
(V+) – 0.8
(V–) + 0.2
2.0
35
1000
+5/–12
TT
TT
TT
TT
T
T
V
V
V
mV
pF
mA
FREQUENCY RESPONSE
Bandwidth, –3dB
Slew Rate
Settling Time, 0.01%
Overload Recovery
G=1
G = 10
G = 100
G = 1000
VO = ±10V, G = 10
G=1
G = 10
G = 100
G = 1000
50% Overdrive
800
500
70
7
0.9
15
15
21
210
20
T kHz
T kHz
T kHz
T kHz
T V/µs
T µs
T µs
T µs
T µs
T µs
POWER SUPPLY
Voltage Range
Current
TEMPERATURE RANGE
Specification
Operating
θJA
VIN = 0V
±1.35
–40
–40
±15
±350
80
±18
±385
85
125
T
T
T
T
T
T
TV
T µA
T °C
T °C
°C/W
T Specification same as INA118PB, UB.
NOTE: (1) Temperature coefficient of the “50k” term in the gain equation. (2) Common-mode input voltage range is limited. See text for discussion of low power supply
and single power supply operation.
®
INA118
2

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PIN CONFIGURATION
8-Pin DIP and SO-8
RG 1
V–IN 2
V+IN 3
V– 4
Top View
8 RG
7 V+
6 VO
5 Ref
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .................................................................................. ±18V
Analog 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
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate 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.
ORDERING INFORMATION
PRODUCT
INA118P
INA118PB
INA118U
INA118UB
PACKAGE
8-Pin Plastic DIP
8-Pin Plastic DIP
SO-8 Surface-Mount
SO-8 Surface-Mount
PACKAGE
DRAWING
NUMBER(1)
006
006
182
182
TEMPERATURE
RANGE
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–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.
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.
®
3 INA118

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TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, unless otherwise noted.
60
G = 1000
50
GAIN vs FREQUENCY
40
G = 100
30
20
G = 10
10
0
G=1
–10
–20
1k
10k 100k 1M
Frequency (Hz)
10M
COMMON-MODE REJECTION vs FREQUENCY
140
120
G=1000
100
G=100
80 G=10
60
G=1
40
20
0
1 10 100 1k 10k 100k
Frequency (Hz)
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE
15
G 10
G 10
10
G=1
G=1
5
+15V
0
VD/2
VD/2
+
+
INA118 VO
Ref
–5 VCM –15V
–10
–15
–15
All
Gains
–10 –5
0
All
Gains
5 10
15
Output Voltage (V)
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE
5
G 10
4
G 10
3
2
G=1
G=1
+5V
1
0
VD/2 +
INA118 VO
–1
VD/2
+
Ref
–2 VCM –5V
–3
–4 All
Gains
–5
All
Gains
–5 –4 –3 –2 –1 0 1 2 3
4
Output Voltage (V)
5
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE
5
4 G 10
G=2
3 G=1
Single Supply
2 +5V
1
VD/2
VD/2
+
+
INA118 VO
Ref
VCM
0
0 1 23 45
Output Voltage (V)
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE
3
G 10
2
G=1
1
Single Supply
VD/2
VD/2
+
+
+3V
INA118 VO
Ref
VCM
0
01 2 3
Output Voltage (V)
®
INA118
4

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TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, unless otherwise noted.
160
140
120
100
80
60
40
20
0
1
POSITIVE POWER SUPPLY REJECTION
vs FREQUENCY
G = 1000
G = 100
G = 10
G=1
10 100 1k 10k 100k
Frequency (Hz)
160
140
120
100
80
60
40
20
0
10
NEGATIVE POWER SUPPLY REJECTION
vs FREQUENCY
G = 100
G = 1000
G = 10
G=1
100 1k
Frequency (Hz)
10k
100k
INPUT- REFERRED NOISE VOLTAGE
vs FREQUENCY
1k
100
100
10
1
1
G=1
10
G = 10
G = 100, 1000
G = 1000 BW Limit
1
Current Noise
(All Gains)
0.1
10 100 1k 10k
Frequency (Hz)
1000
100
10
1
SETTLING TIME vs GAIN
RL = 10k
CL = 100pF
0.01%
0.1%
10 100
Gain (V/V)
1000
QUIESCENT CURRENT and SLEW RATE
vs TEMPERATURE
500 1.5
400
Slew Rate
1
IQ VS = ±15V
300 0.5
VS = ±1.35V
200
–75 –50 –25
0 25 50
Temperature (°C)
0
75 100 125
10
8
6
4
2
0
–2
–4 G = 1
–6
–8
–10
–40
INPUT BIAS CURRENT
vs INPUT OVERLOAD VOLTAGE
G = 1000
G = 1000
G=1
0
Overload Voltage (V)
40
®
5 INA118