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®
INA145
INA145
For most current data sheet and other product
information, visit www.burr-brown.com
Programmable Gain
DIFFERENCE AMPLIFIER
FEATURES
q DIFFERENTIAL GAIN = 1V/V TO 1000V/V:
Set with External Resistors
q LOW QUIESCENT CURRENT: 570µA
q WIDE SUPPLY RANGE:
Single Supply: 4.5V to 36V
Dual Supplies: ±2.25V to ±18V
q HIGH COMMON-MODE VOLTAGE:
+8V at VS = +5V
±28V at VS = ±15V
q LOW GAIN ERROR: 0.01%
q HIGH CMR: 86dB
q SO-8 PACKAGE
APPLICATIONS
q CURRENT SHUNT MEASUREMENTS
q SENSOR AMPLIFIER
q DIFFERENTIAL LINE RECEIVER
q BATTERY POWERED SYSTEMS
DESCRIPTION
The INA145 is a precision, unity-gain difference
amplifier consisting of a precision op amp and on-
chip precision resistor network. Two external resistors
set the gain from 1V/V to 1000V/V. The input com-
mon-mode voltage range extends beyond the positive
and negative rails.
On-chip precision resistors are laser-trimmed to achieve
accurate gain and high common-mode rejection. Ex-
cellent TCR tracking of these resistors assures contin-
ued high precision over temperature.
The INA145 is available in the SO-8 surface-mount
package specified for the extended industrial tempera-
ture range, –40°C to +85°C.
VIN– 2
VIN+ 3
V+
R1
40k
7
R2
40k
G=1
R3
40k
A1
R4
40k
4
V–
RG1
RG2
RG 5
R5
10k
(1%)
A2 6 VO
VO = (VI+N – VI–N)(1 + RG2/RG1)
INA145
18
Ref V01
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-11567B
INA145Printed in U.S.A. March, 2000
®

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SPECIFICATIONS: VS = ±2.25V to ±18V
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C
At TA = +25°C, G = 1, RL = 10kconnected to ground and ref pin connected to ground unless otherwise noted.
INA145UA
PARAMETER
OFFSET VOLTAGE, VO
Input Offset Voltage
vs Temperature
vs Power Supply
vs Time
Offset Voltage, V01
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection
Over Temperature
VOS
VOS /T
PSRR
VCM
CMRR
INPUT BIAS CURRENT(2)
Bias Current
Offset Current
INPUT IMPEDANCE
Differential (non-inverting input)
Differential (inverting input)
Common-Mode
IB
IOS
NOISE
Voltage Noise, f = 0.1Hz to 10Hz
Voltage Noise Density, f = 1kHz
GAIN
Gain Equation
Initial(1)
Gain Error
vs Temperature
en
vs Temperature
Nonlinearity
FREQUENCY RESPONSE
Small Signal Bandwidth
Slew Rate
Settling Time, 0.1%
0.01%
Overload Recovery
CONDITION
RTI(1, 2)
VCM = VO = 0V
VS = ±1.35V to ±18V
RTI(1, 2)
(VIN+) – (VIN–) = 0V, VO = 0V
VCM = 2(V–) to 2(V+) – 2V, RS = 0
VS = ±15V
VCM = VS /2
RTI(1, 3)
RL = 100k, VO = (V–)+0.15 to (V+)–1, G = 1
RL = 100k, VO = (V–)+0.25 to (V+)–1, G = 1
RL = 10k, VO = (V–)+0.3 to (V+)–1.25, G = 1
RL = 10k, VO = (V–)+0.5 to (V+)–1.25, G = 1
RL = 10k, VO = (V–)+0.3 to (V+)–1.25, G = 1
G=1
G = 10
G = 1, 10V Step
G = 1, 10V Step
50% Input Overload
MIN TYP MAX
±0.2
See Typical Curve
±20
±0.3
±0.4
±1
±60
2(V–)
76
70
2(V+) –2
86
80
±50
±5
80
27
40
2
90
G = 1 to 1000
G = 1 + RG2 / RG1
1
±0.01
±2
±0.01
±2
±0.0002
±0.1
±10
±0.1
±10
±0.005
500
50
0.45
40
90
40
UNITS
mV
µV/ V
µV/mo
mV
V
dB
dB
nA
nA
k
k
k
µVp-p
nV/Hz
V/ V
V/V
%
ppm /°C
%
ppm /°C
% of FS
kHz
kHz
V/µs
µs
µs
µs
OUTPUT, VO
Voltage Output
Over Temperature
Over Temperature
Short-Circuit Current
Capacitive Load
RL = 100k, G = 1
RL = 100k, G = 1
RL = 10k, G = 1
RL = 10k, G = 1
Continuous to Common
Stable Operation
(V–) + 0.15
(V–) + 0.25
(V–) + 0.3
(V–) + 0.5
±15
1000
(V+) – 1
(V+) – 1
(V+) – 1.25
(V+) – 1.25
V
V
V
V
mA
pF
POWER SUPPLY
Specified Voltage Range, Dual Supplies
Operating Voltage Range
Quiescent Current
Over Temperature
VIN = 0, IO = 0
±2.25
±1.35
±570
±18
±18
±700
±800
V
V
µA
µA
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
θJA
–40 +85 °C
–55
+125
°C
–55
+125
°C
150 °C/W
NOTES: (1) Referred to input pins (VIN+ and VIN–), Gain = 1V/V. Specified with 10kin feedback of A2. (2) Input offset voltage specification includes effects of amplifier’s
input bias and offset currents. (3) Includes effects of input bias 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.
®
INA145
2

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SPECIFICATIONS: VS = +5V Single Supply
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C
At TA = +25°C, G = 1, RL = 10kconnected to ground and ref pin connected to 2.5V unless otherwise noted.
INA145UA
PARAMETER
OFFSET VOLTAGE, VO
Input Offset Voltage
VOS
vs Temperature
VOS /T
vs Power Supply Rejection Ratio PSRR
vs Time
Offset Voltage, V01
INPUT VOLTAGE RANGE
Common-Mode Voltage Range(3)
Common-Mode Rejection Ratio
Over Temperature
VCM
CMRR
CONDITION
RTI(1, 2)
VCM = VO = 2.5V
VS = ±1.35V to ±18V
RTI(1, 2)
VIN+ – VIN– = 0V, VO = 2.5V
VCM = –2.5V to +5.5V, RS = 0
MIN TYP
MAX
±0.35
See Typical Curve
±20
±0.3
±0.55
±1
±60
–2.5
76
86
80
5.5
UNITS
mV
µV/ °C
µV/mo
mV
V
dB
dB
INPUT BIAS CURRENT(2)
Bias Current
Offset Current
INPUT IMPEDANCE
Differential (non-inverting input)
Differential (inverting input)
Common-Mode
NOISE
Voltage Noise, f = 0.1Hz to 10Hz
Voltage Noise Density, f = 1kHz
GAIN
Gain Equation
Initial(1)
Gain Error
vs Temperature
vs Temperature
Nonlinearity
FREQUENCY RESPONSE
Small Signal Bandwidth
Slew Rate
Settling Time, 0.1%
0.01%
Overload Recovery
IB
IOS
RTI(1, 4)
en
RL = 100k, VO = 0.15V to 4V, G = 1
RL = 100k, VO = 0.25V to 4V, G = 1
RL = 10k, VO = 0.3V to 3.75V, G = 1
RL = 10k, VO = 0.5V to 3.75V, G = 1
RL = 10k, VO = +0.3 to +3.75, G = 1
G = 0.1
G=1
G = 1, 10V Step
G = 1, 10V Step
50% Input Overload
±50
±5
80
27
40
2
90
G = 1 to 1000
G = 1 + RG2 / RG1
1
±0.01
±2
±0.01
±2
±0.001
±0.1
±10
±0.1
±10
±0.005
500
50
0.45
40
90
40
nA
nA
k
k
k
µVp-p
nV/Hz
V/V
V/V
V/V
%
ppm /°C
%
ppm /°C
% of FS
kHz
kHz
V/µs
µs
µs
µs
OUTPUT, VO
Voltage Output
Over Temperature
Over Temperature
Short-Circuit Current
Capacitive Load
RL = 100k, G = 1
RL = 100k, G = 1
RL = 10k, G = 1
RL = 10k, G = 1
Continuous to Common
Stable Operation
0.15
0.25
0.3
0.5
±15
1000
4
4
3.75
3.75
V
V
V
V
mA
pF
POWER SUPPLY
Specified Voltage Range, Single Supply
Operating Voltage Range
Quiescent Current
Over Temperature
VIN = 0, IO = 0
+4.5
+2.7
550
+36
+36
700
800
V
V
µA
µA
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
θJA
–40 +85 °C
–55
+125
°C
–55
+125
°C
150 °C/W
NOTES: (1) Referred to input pins (VIN+ and VIN–), Gain = 1V/V. Specified with 10kin feedback of A2. (2) Input offset voltage specification includes effects of
amplifier’s input bias and offset currents. (3) Common-mode voltage range with single supply is 2(V+) – 2V – VREF to –VREF. (4) Includes effects of input current
noise and thermal noise contribution of resistor network.
®
3 INA145

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AMPLIFIER A1, A2 PERFORMANCE
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C
At TA = +25°C, G = 1, RL = 10kconnected to ground and ref pin connected to ground unless otherwise noted.
PARAMETER
OFFSET VOLTAGE, VO
Input Offset Voltage
vs Temperature
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
OPEN-LOOP GAIN
Open Loop Gain
INPUT BIAS CURRENT(2)
Bias Current
Offset Current
RESISTOR AT A1 OUTPUT, VO1
Initial
Error
Temperature Drift Coefficient
VOS
VOS /T
VCM
CMRR
AOL
IB
IOS
CONDITION
RTI(1, 2)
VS = ±15V, VCM = VO = 0V
VIN+ – VIN– = 0V, VO = 0V
VCM = (V–) to (V+) –1
INA145UA
MIN TYP
MAX
±0.5
±1
(V–) to (V+) –1
90
110
±50
±5
10
±0.2
±50
UNITS
mV
µV/°C
V
dB
dB
nA
nA
k
%
ppm/°C
PIN CONFIGURATION
Top View
Ref 1
VI–N 2
VI+N 3
V– 4
8 VO1
7 V+
6 VO
5 RG
SO-8
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, V+ to V– .................................................................... 36V
Signal Input Terminals, Voltage ........................................................ ±80V
Current ....................................................... ±1mA
Output Short Circuit (to ground) .............................................. Continuous
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ..................................................... –55°C to +150°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +240°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
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
INA145UA
"
PACKAGE
SO-8
"
PACKAGE
DRAWING
NUMBER
182
"
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
"
PACKAGE
MARKING
INA145UA
"
ORDERING
NUMBER(1)
INA145UA
INA145UA/2K5
TRANSPORT
MEDIA
Rails
Tape and Reel
NOTE: (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 “INA145UA/2K5” will get a single 2500-piece Tape and Reel.
®
INA145
4

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TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, G = 1, RL = 10kconnected to ground and Ref pin connected to ground, unless otherwise noted.
60
40
20
0
–20
100
GAIN vs FREQUENCY
G = 100
VS = ±15V
CL = 1000pF
G = 10
G=1
1K
10K 100K
1M
10M
Frequency (Hz)
60
40
20
0
–20
100
GAIN vs FREQUENCY
G = 100
VS = ±15V
CL = 200pF 10k
G = 10
G=1
1K 10K 100K 1M 10M
Frequency (Hz)
COMMON-MODE REJECTION vs FREQUENCY
100
80
60
40
20
0
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
POWER SUPPLY REJECTION vs FREQUENCY
100
PSR+
(VS = ±15V)
80
PSR+
60 (VS = +5V)
40
20
0
1
PSR–
(VS = ±15V)
10 100 1k 10k 100k
Frequency (Hz)
INPUT VOLTAGE NOISE DENSITY
1k
G=1
100
G = 100
G = 10
10
0.1 1 10 100 1k 10k 100k
Frequency (Hz)
0.1Hz to 10Hz VOLTAGE NOISE (RTI)
500ms/div
®
5 INA145