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® INA155
INA155
For most current data sheet and other product
information, visit www.burr-brown.com
INA155
Single-Supply, Rail-to-Rail Output, CMOS
INSTRUMENTATION AMPLIFIER
FEATURES
q RAIL-TO-RAIL OUTPUT SWING: Within 10mV
q LOW OFFSET VOLTAGE: ±200µV
q LOW OFFSET DRIFT: ±5µV/°C
q INTERNAL FIXED GAIN = 10V/V OR 50V/V
q SPECIFIED TEMPERATURE RANGE:
–55°C to +125°C
q LOW INPUT BIAS CURRENT: 0.2pA
q WIDE BANDWIDTH: 550kHz in G = 10
q HIGH SLEW RATE: 6.5V/µs
q LOW COST
q SO-8 AND TINY MSOP-8 PACKAGES
APPLICATIONS
q INDUSTRIAL SENSOR AMPLIFIERS
Bridge, RTD, Thermocouple, Flow, Position
q MEDICAL EQUIPMENT
ECG, EEG, EMG Amplifiers
q DRIVING A/D CONVERTERS
q PCMCIA CARDS
q AUDIO PROCESSING
q COMMUNICATIONS
q TEST EQUIPMENT
q LOW COST AUTOMOTIVE INSTRUMENTATION
DESCRIPTION
The INA155 is a low-cost CMOS instrumentation
amplifier with rail-to-rail output swing optimized for
low voltage, single-supply operation.
Wide bandwidth (550kHz in G = 10) and high slew
rate (6.5V/µs) make the INA155 suitable for driving
sampling A/D converters as well as general purpose
and audio applications. Fast settling time allows use
with higher speed sensors and transducers and rapid
scanning data acquisition systems.
Gain can be set to 10V/V or 50V/V by pin strapping.
Gains between these two values can be obtained with
the addition of a single resistor. The INA155 is fully
specified over the supply range of +2.7 to +5.5V.
The INA155 is available in MSOP-8 and SO-8 sur-
face-mount packages. Both are specified for operation
over the temperature range –55°C to 125°C.
G = 10 pins open
RG G = 50 pins connected
1
5 200k
Ref
5k
22.2k
22.2k
VIN 2
VI+N 3
A1
RG V+
87
INA155
5k
200k
VO = (VI+N – VIN– ) • G + VREF
6
A2 VO
4
V–
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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1999 Burr-Brown Corporation
PDS-1529A
Printed in U.S.A. October, 1999

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SPECIFICATIONS: VS = +2.7V to +5.5V
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C
At TA = +25°C, RL = 10kconnected to VS/2. RG pins open (G = 10), and Ref = VS /2, unless otherwise noted.
INA155E, U
INA155EA, UA
PARAMETER
CONDITION
MIN
TYP MAX
MIN
TYP
MAX
UNITS
INPUT
Offset Voltage, RTI
Over Temperature
Drift
vs Power Supply
Over Temperature
vs Time
VOS
dVOS/dT
PSRR
VS = +5.0V, VCM = VS/2
VS = +2.7V to +6V, VCM = 0.2 • VS
±0.2 ±1
±1.5
±5
±50 ±200
±250
±0.4
V V mV
V mV
V µV/°C
V V µV/V
V µV/V
V µV/mo
INPUT VOLTAGE RANGE
Safe Input Voltage
(V–) – 0.5
(V+) + 0.5
V
VV
Common-Mode Range(1)
VCM
VS = 5.5V
0.3
5.2(2)
V
VV
VS = 2.7V
0.15
2.5(2)
V
VV
Common-Mode Rejection Ratio
CMRR VS = 5.5V, 0.6V < VCM < 3.7V, G = 10
92
100
80 V
dB
Over Temperature
85 79
dB
VS = 5.5V,0.6V < VCM < 3.7V, G = 50
86
90
77 V
dB
Over Temperature
85 76
dB
INPUT IMPEDANCE
Differential
Common-Mode
1013 || 3
1013 || 3
V || pF
V || pF
INPUT BIAS CURRENT
Input Bias Current
Offset Current
NOISE, RTI
Voltage Noise: f = 0.1Hz to 10Hz
Voltage Noise Density: f = 10Hz
f = 100Hz
f = 1kHz
Current Noise: f = 1kHz
IB
IOS
RS = 0, G = 10 or 50
±1 ±10
±1 ±10
4.5
260
99
40
2
V V pA
V V pA
V µV/Vp-p
V nV/Hz
V nV/Hz
V nV/Hz
V fA/Hz
GAIN
Gain Equation
Gain Error(3)
vs Temperature
vs Temperature
10 50 V
V V/V
VS = 5.5V, VO = 0.01V to 5.49V, G = 10
G = 10 + 400k/(10k+ RG)
±0.02
±0.1
±2 ±10
V V/V
VV
%
V V ppm/°C
VS = 5.5V, VO = 0.05V to 5.45V, G = 50
±0.05
±15
±0.25
±30
VV
%
V V ppm/°C
Nonlinearity
Over Temperature
VS = 5.5V, G = 10 or 50
±0.005
±0.05
±0.05
% of FSR
V % of FSR
OUTPUT
Voltage Output Swing from Rail
Over Temperature
Short-Circuit Current
Capacitance Load (stable operation)
RL = 10k, GERR < 0.1%
Short Circuit to Ground
5 10
10
±50
See Typical Curve
V V mV
V mV
V mA
V
FREQUENCY RESPONSE
Bandwidth, –3dB
Slew Rate
Settling Time: 0.1%
0.01%
Overload Recovery
Total Harmonic Distortion + Noise
BW
SR
tS
THD+N
G = 10
G = 50
VS = 5.5V, CL = 100pF
VS = 5.5V, VO = 2V Step, CL = 100pF, G = 10
VS = 5.5V, VO = 2V Step, CL = 100pF, G = 50
VS = 5.5V, VO = 2V Step, CL = 100pF, G = 10
VS = 5.5V, VO = 2V Step, CL = 100pF, G = 50
50% Input Overload
550
110
6.5
5
11
8
15
0.2
See Typical Curve
V kHz
V kHz
V V/µs
V µs
V µs
V µs
V µs
V µs
V
POWER SUPPLY
Specified Voltage Range
Operating Voltage Range
Quiescent Current
Over Temperature
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
MSOP-8 Surface Mount
SO-8 Surface Mount
VIN = 0, IO = 0
VIN = 0, IO = 0
θJA
+2.7 +5.5 V
VV
+2.5 to +6
VV
1.7 2.1
V V mA
2.6 V mA
–40 +85 V
–65
+150
V
–65
+150
V
V °C
V °C
V °C
150 V °C/W
150 V °C/W
V Same as INA155E, U.
NOTES: (1) For further information, refer to typical performance curves on common-mode input range. (2) Operation beyond (V+) – 1.8V (max) results in reduced common-mode
rejection. See discussion and Figure 6 in the text of this data sheet. (3) Does not include error and TCR of additional optional gain-setting resistor in series with RG, if used.
®
INA155
2

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SPECIFICATIONS: VS = +2.7V to +5.5V
Boldface limits apply over the specified temperature range, TA = –55°C to +125°C
At TA = +25°C, RL = 10kconnected to VS/2. RG pins open (G = 10), and Ref = VS /2, unless otherwise noted.
INA155E, U
INA155EA, UA
PARAMETER
CONDITION
MIN
TYP MAX
MIN
TYP
MAX
UNITS
INPUT
Offset Voltage, RTI
Over Temperature
Drift
vs Power Supply
Over Temperature
vs Time
VOS
dVOS/dT
PSRR
VS = +5.0V, VCM = VS/2
VS = +2.7V to +6V, VCM = 0.2 • VS
±0.2 ±1
±2
±5
±50 ±200
±250
±0.4
V V mV
V mV
V µV/°C
V V µV/V
V µV/V
V µV/mo
INPUT VOLTAGE RANGE
Safe Input Voltage
(V–) – 0.5
(V+) + 0.5
V
VV
Common-Mode Range(1)
VCM
VS = 5.5V
0.3
5.2(2)
V
VV
VS = 2.7V
0.15
2.5(2)
V
VV
Common-Mode Rejection Ratio
CMRR VS = 5.5V, 0.6V < VCM < 3.7V, G = 10
92
100
80 V
dB
Over Temperature
82 78
dB
VS = 5.5V, 0.6V < VCM < 3.7V, G = 50
86
90
77 V
dB
Over Temperature
84 76
dB
INPUT IMPEDANCE
Differential
Common-Mode
1013 || 3
1013 || 3
V || pF
V || pF
INPUT BIAS CURRENT
Input Bias Current
Offset Current
NOISE, RTI
Voltage Noise: f = 0.1Hz to 10Hz
Voltage Noise Density: f = 10Hz
f = 100Hz
f = 1kHz
Current Noise: f = 1kHz
IB
IOS
RS = 0, G = 10 or 50
±1 ±10
±1 ±10
4.5
260
99
40
2
V V pA
V V pA
V µV/Vp-p
V nV/Hz
V nV/Hz
V nV/Hz
V fA/Hz
GAIN
Gain Equation
Gain Error(3)
vs Temperature
vs Temperature
10 50 V
V V/V
VS = 5.5V, VO = 0.01V to 5.49V, G = 10
G = 10 + 400k/(10k+ RG)
±0.02
±0.1
±2 ±10
V V/V
VV
%
V V ppm/°C
VS = 5.5V, VO = 0.05V to 5.45V, G = 50
±0.05
±15
±0.25
±30
VV
%
V V ppm/°C
Nonlinearity
Over Temperature
VS = 5.5V, G = 10 or 50
±0.005
±0.05
±0.05
% of FSR
V % of FSR
OUTPUT
Voltage Output Swing from Rail
Over Temperature
Short-Circuit Current
Capacitance Load (stable operation)
RL = 10k, GERR < 0.1%
Short Circuit to Ground
5 10
10
±50
See Typical Curve
V V mV
V mV
V mA
V
FREQUENCY RESPONSE
Bandwidth, –3dB
Slew Rate
Settling Time: 0.1%
0.01%
Overload Recovery
Total Harmonic Distortion + Noise
BW
SR
tS
THD+N
G = 10
G = 50
VS = 5.5V, CL = 100pF
VS = 5.5V, VO = 2V Step, CL = 100pF, G = 10
VS = 5.5V, VO = 2V Step, CL = 100pF, G = 50
VS = 5.5V, VO = 2V Step, CL = 100pF, G = 10
VS = 5.5V, VO = 2V Step, CL = 100pF, G = 50
50% Input Overload
550
110
6.5
5
11
8
15
0.2
See Typical Curve
V kHz
V kHz
V V/µs
V µs
V µs
V µs
V µs
V µs
V
POWER SUPPLY
Specified Voltage Range
Operating Voltage Range
Quiescent Current
Over Temperature
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
MSOP-8 Surface Mount
SO-8 Surface Mount
VIN = 0, IO = 0
VIN = 0, IO = 0
θJA
+2.7 +5.5 V
VV
+2.5 to +6
VV
1.7 2.1
V V mA
2.8 V mA
–55
+125
V
–65
+150
V
–65
+150
V
V °C
V °C
V °C
150 V °C/W
150 V °C/W
V Same as INA155E, U.
NOTES: (1) For further information, refer to typical performance curves on common-mode input range. (2) Operation beyond (V+) – 1.8V (max) results in reduced common-mode
rejection. See discussion and Figure 6 in the text of this data sheet. (3) Does not include error and TCR of additional optional gain-setting resistor in series with RG, if used.
®
3 INA155

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PIN CONFIGURATION
Top View
SO-8 (U), MSOP-8 (E)
RG 1
VIN 2
VI+N 3
V– 4
INA155
8 RG
7 V+
6 VOUT
5 Ref
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, V+ to V– ................................................................... 7.5V
Signal Input Terminals, Voltage(2) .................. (V–) – 0.5V to (V+) + 0.5V
Current(2) .................................................... 10mA
Output Short-Circuit(3) .............................................................. Continuous
Operating Temperature .................................................. –65°C to +150°C
Storage Temperature ..................................................... –65°C to +150°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those specified is not implied.
(2) Input terminals are diode-clamped to the power supply rails. Input signals
that can swing more that 0.5V beyond the supply rails should be current limited
to 10mA or less. (3) Short circuit to ground.
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.
PACKAGE/ORDERING INFORMATION
PRODUCT
INA155U
"
INA155UA
"
INA155E
"
INA155EA
"
PACKAGE
SO-8
"
SO-8
"
MSOP-8
"
MSOP-8
"
PACKAGE
DRAWING
NUMBER
182
"
182
"
337
"
337
"
SPECIFIED
TEMPERATURE
RANGE
–55°C to +125°C
"
–55°C to +125°C
"
–55°C to +125°C
"
–55°C to +125°C
"
PACKAGE
MARKING
INA155U
"
INA155UA
"
A55
"
A55
"
ORDERING
NUMBER(1)
INA155U
INA155U/2K5
INA155UA
INA155UA/2K5
INA155E/250
INA155E/2K5
INA155EA/250
INA155EA/2K5
TRANSPORT
MEDIA
Rails
Tape and Reel
Rails
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
NOTES: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces
of “INA155UA/2K5” will get a single 2500-piece Tape and Reel.
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.
®
INA155
4

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TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = 5.5V, RL = 10kconnected to VS/2. RG pins open (G = 10), and Ref = VS /2, unless otherwise noted.
40
35
30
25
20
15
10
5
0
1
GAIN vs FREQUENCY
G = 50
G =10
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
COMMON-MODE REJECTION RATIO vs FREQUENCY
120
G = 10
100
80
G = 50
60
40
20
0
0.1 1 10 100 1k 10k 100k
Frequency (Hz)
POWER SUPPLY REJECTION RATIO vs FREQUENCY
100
90
80
70
60
50
40
30
20
10
0
1
10
100
1k
10k 100k
1M
Frequency (Hz)
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
6
5
4
3
2
1
VS = 5.5V
0
1 10 100 1k 10k
Frequency (Hz)
100k
1M
SHORT-CIRCUIT CURRENT AND QUIESCENT CURRENT
vs POWER SUPPLY
55 1.8
–ISC
50 1.75
+ISC
45 1.7
40 1.65
IQ
35 1.6
30 1.55
25 1.5
2.5 3 3.5 4.0 4.5 5 5.5 6
Supply Voltage (V)
QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT
vs TEMPERATURE
2.5 100
–ISC
2.0
+ISC
1.5
IQ
1.0
80
60
40
0.5 20
0
75 –50 –25
0
0 25 50 75 100 125 150
Temperature (°C)
®
5 INA155