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®
INA157
INA157
For most current data sheet and other product
information, visit www.burr-brown.com
High-Speed, Precision
DIFFERENCE AMPLIFIER
FEATURES
q DESIGNED FOR LOW COST
q LOW OFFSET VOLTAGE: ±500µV max
q LOW OFFSET DRIFT: ±2µV/°C
q LOW GAIN ERROR: ±0.05% max
q WIDE BANDWIDTH: 3MHz
q HIGH SLEW RATE: 14V/µs
q FAST SETTLING TIME: 3µs to 0.01%
q WIDE SUPPLY RANGE: ±4V to ±18V
q LOW QUIESCENT CURRENT: 2.4mA
q SO-8 SURFACE-MOUNT PACKAGE
APPLICATIONS
q DIFFERENTIAL INPUT AMPLIFIER
q INSTRUMENTATION AMPLIFIER
BUILDING BLOCK
q G = 1/2 AMPLIFIER
q G = 2 AMPLIFIER
q DIFFERENTIAL CURRENT RECEIVER
q VOLTAGE-CONTROLLED CURRENT SOURCE
q GROUND LOOP ELIMINATOR
q CURRENT SHUNT MONITOR
DESCRIPTION
The INA157 is a high slew rate, G = 1/2 or G = 2
difference amplifier consisting of a precision op amp
with a precision resistor network. The on-chip resis-
tors are laser trimmed for accurate gain and high
common-mode rejection. Excellent TCR tracking of
the resistors maintains gain accuracy and common-
mode rejection over temperature. The input common-
mode voltage range extends beyond the positive and
negative supply rails. It operates on ±4V to ±18V
supplies.
The difference amplifier is the foundation of many
commonly used circuits. The INA157 provides this
circuit function without using an expensive precision
resistor network. The INA157 is available in a SO-8
surface-mount package and is specified for operation
over the extended industrial temperature range, –40°C
to +85°C.
12k
–In 2
V+
7
6k
5 Sense
12k
3
+In
6k
4
V–
6 Output
1 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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1999 Burr-Brown Corporation
PDS-1483B
Printed in U.S.A. March, 1999

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SPECIFICATIONS: VS = ±15V
At TA = +25°C, VS = ±15V, RL = 2kconnected to ground, and reference pin connected to ground, unless otherwise noted.
INA157U
INA157UA
PARAMETER
CONDITIONS
MIN TYP
OFFSET VOLTAGE(1)
Initial(1)
vs Temperature
vs Power Supply
vs Time
RTO
VS = ±4V to ±18V
±100
±2
±5
0.25
INPUT IMPEDANCE(2)
Differential
Common-Mode
24
18
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Positive
Negative
Common-Mode Rejection Ratio
OUTPUT VOLTAGE NOISE(3)
f = 0.1Hz to 10Hz
f = 1kHz
VO = 0V
VO = 0V
VCM = –37.5V to 37.5V, RS = 0
RTO
3(V+)–7.5
3(V–)+7.5
86
3(V+)–6
3(V–)+3
96
1.3
26
GAIN
Initial
Error
vs Temperature
Nonlinearity
OUTPUT
Voltage, Positive
Negative
Current Limit, Continuous to Common
Capacitive Load (stable operation)
VO = –10V to +10V
VO = –10V to +10V
0.5
±0.01
±1
±0.0001
(V+)–2
(V–)+2
(V+)–1.8
(V–)+1.6
±60
500
FREQUENCY RESPONSE
Small-Signal Bandwidth
Slew Rate
Settling Time: 0.1%
0.01%
Overload Recovery Time
–3dB
10V Step, CL = 100pF
10V Step, CL = 100pF
50% Overdrive
4
14
2
3
3
POWER SUPPLY
Rated Voltage
Operating Voltage Range
Quiescent Current
TEMPERATURE RANGE
Specified
Operation
Storage
Thermal Resistance, ΘJA
SO-8 Surface-Mount
IO = 0mA
±15
±4
±2.4
–40
–55
–55
150
MAX
±500
±20
±60
±0.05
±10
±0.001
±18
±2.9
+85
+125
+125
MIN
V
V
80
V
V
V
V
V
V
TYP
V
V
V
V
V
V
MAX
±1000
V
V
UNITS
µV
µV/°C
µV/V
µV/mo
k
k
VV
VV
V dB
V µVp-p
V nV/Hz
V V/V
V ±0.1
%
V V ppm/°C
V
±0.002
% of FS
VV
VV
V mA
V pF
V MHz
V V/µs
V µs
V µs
V µs
VV
VV
V V mA
V °C
V °C
V °C
V °C/W
VSpecifications the same as INA157U.
NOTES: (1) Includes effects of amplifier’s input bias and offset currents. (2) Internal resistors are ratio matched but have ±20% absolute value. (3) Includes effects
of amplifier’s input current noise and thermal noise contribution of resistor network.
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.
®
INA157
2

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PIN CONFIGURATION
TOP VIEW
SO-8
Ref 1
–In 2
+In 3
V– 4
8 NC
7 V+
6 Output
5 Sense
NC = No Connection
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, V+ to V– .................................................................... 40V
Input Voltage Range .......................................................................... ±80V
Output Short Circuit (to ground) ............................................. Continuous
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ..................................................... –55°C to +125°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.
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.
PACKAGE/ORDERING INFORMATION
PRODUCT
INA157U
"
INA157UA
"
PACKAGE
SO-8 Surface-Mount
"
SO-8 Surface-Mount
"
PACKAGE
DRAWING
NUMBER(1)
182
"
182
"
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
"
–40°C to +85°C
"
PACKAGE
MARKING
INA157U
"
INA157UA
"
ORDERING
NUMBER(2)
INA157U
INA157U/2K5
INA157UA
INA157UA/2K5
TRANSPORT
MEDIA
Rails
Tape and Reel
Rails
Tape and Reel
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) 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 “INA157U/2K5” will get a single
2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.
®
3 INA157

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TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, and G = 1/2, unless otherwise noted.
10
0
–10
–20
–30
1k
GAIN vs FREQUENCY
10k 100k 1M
Frequency (Hz)
10M
COMMON-MODE REJECTION RATIO vs FREQUENCY
100
80
60
40
1k
RTO
10k 100k
Frequency (Hz)
1M
POWER SUPPLY REJECTION RATIO vs FREQUENCY
120
RTO
100
80 –PSRR
60
40
+PSRR
20
0
100
1k 10k 100k
Frequency (Hz)
1M
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
40
30
20
10
0
100 1k 10k 100k 1M 10M
Frequency (Hz)
INPUT COMMON-MODE VOLTAGE
vs OUTPUT VOLTAGE
80
G = 1/2
60 VS = ±15V
40
20
0
–20
–40
–60 VREF = 0V
RL = 2k
–80
–20 –15 –10
–5
0
5 10 15 20
Output Voltage (V)
0.1
0.010
0.001
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
VO = 5Vrms
RL = 100k
RL = 2k
0.0001
20
100 1k
Frequency (Hz)
RL = 600
10k 20k
®
INA157
4

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TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, and G = 1/2, unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
4
3
2
1
0
–75 –50 –25
0
25 50
Temperature (°C)
75 100 125
SLEW RATE vs TEMPERATURE
16
–SR
14
+SR
12
10
8
–75 –50 –25
0
25 50
Temperature (°C)
75 100 125
SHORT-CIRCUIT CURRENT vs TEMPERATURE
80
60
40
+ISC
20
0
–20
–ISC
–40
–60
–80
–75 –50 –25
0
25 50
Temperature (°C)
75 100 125
OUTPUT VOLTAGE NOISE SPECTRAL DENSITY
vs FREQUENCY
10k
1k
100
10
1
10 100 1k 10k 100k 1M
Frequency (Hz)
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
14
13
12
11 125°C
10
85°C
9
–55°C
25°C
–9
–10
–11
–12
–13
–14
0
125°C
85°C
25°C
–55°C
±20 ±40 ±60
Output Current (mA)
±80
OUTPUT NOISE VOLTAGE
vs NOISE BANDWIDTH
100
10
1
0.1
1
10 100 1k 10k 100k
Frequency (Hz)
®
5 INA157