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® INA101
High Accuracy
INSTRUMENTATION AMPLIFIER
FEATURES
q LOW DRIFT: 0.25µV/°C max
q LOW OFFSET VOLTAGE: 25µV max
q LOW NONLINEARITY: 0.002%
q LOW NOISE: 13nV/Hz
q HIGH CMR: 106dB AT 60Hz
q HIGH INPUT IMPEDANCE: 1010
q 14-PIN PLASTIC, CERAMIC DIP,
SOL-16, AND TO-100 PACKAGES
APPLICATIONS
q STRAIN GAGES
q THERMOCOUPLES
q RTDs
q REMOTE TRANSDUCERS
q LOW-LEVEL SIGNALS
q MEDICAL INSTRUMENTATION
DESCRIPTION
The INA101 is a high accuracy instrumentation ampli-
fier designed for low-level signal amplification and
general purpose data acquisition. Three precision op
amps and laser-trimmed metal film resistors are inte-
grated on a single monolithic integrated circuit.
The INA101 is packaged in TO-100 metal, 14-pin
plastic and ceramic DIP, and SOL-16 surface-mount
packages. Commercial, industrial and military tem-
perature range models are available.
–Input
10
1
1k
RG
4
5
+Input
1k
Offset
Adj.
23
A1
20k
20k
A2
96
+VCC –VCC
TO-100 PACKAGE
10k
10k
INA101
10k
A3
10k
Output
8
Common
7
–Input
Gain Sense 1
Gain Set 1
RG
Gain Set 2
Gain Sense 2
+Input
3
1k
4
5
10
11
1k
12
Offset
Adj. A1 Output
67
8
DIP PACKAGE
INA101
A1
20k
10k
20k
A2
10k
10k
A3
Output
1
10k
Common
14
2 13
+VCC –VCC
9
A2 Output
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
©1981 Burr-Brown Corporation
PDS-454K
Printed in U.S.A. July, 1998

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SPECIFICATIONS
ELECTRICAL
At +25°C with ±15VDC power supply and in circuit of Figure 1, unless otherwise noted.
INA101AM, AG
INA101SM, SG
INA101CM, CG
INA101HP, KU
PARAMETER
MIN TYP
MAX
MIN TYP
MAX MIN
TYP
MAX MIN
TYP
MAX UNITS
GAIN
Range of Gain
Gain Equation
Error from Equation, DC(1)
Gain Temp. Coefficient(3)
G=1
G = 10
G = 100
G = 1000
Nonlinearity, DC(2)
1
G = 1 + (40k/RG)
±(0.04 + 0.00016G
–0.02/G)
1000
±(0.1 + 0.0003G
–0.05/G)
*
*
*
2
20
22
22
±(0.002 + 10–5 G)
5
100
110
110
±(0.005 + 2 x 10–5 G)
*
*
*
*
±(0.001
+10–5 G)
*
*
*
*
*
*
±(0.002
+10–5 G)
*
*
*
*
10
11
11
±(0.001
+10–5 G)
**
* V/V
* V/V
*
±(0.1 +
±(0.3 +
%
0.00015G)
0.0002G)
–0.05/G
–0.10/G
*
*
*
*
±(0.002
+10–5 G)
* * ppm/°C
* * ppm/°C
* * ppm/°C
* * ppm/°C
* * % of p-p FS
RATED OUTPUT
Voltage
Current
Output Impedance
Capacitive Load
±10 ±12.5
±5 ±10
0.2
1000
**
**
*
*
**
**
*
*
**
**
*
*
V
mA
pF
INPUT OFFSET VOLTAGE
Initial Offset at +25°C
vs Temperature
vs Supply
vs Time
±(25 + 200/G)
±(1 + 20/G)
±(1 + 20/G)
±(50 + 400/G)
±(2 + 20/G)
±10+
100/G)
*
*
±(25
+200/G)
±(0.75
+ 10/G)
±(10+
100/G)
*
*
±(25 +
200/G)
±(0.25 +
10/G)
±(125 +
450/G)
±(2 + 20/G)
*
*
±(250 +
900/G)
µV
µV/°C
µV/V
µV/mo
INPUT BIAS CURRENT
Initial Bias Current
(each input)
vs Temperature
vs Supply
Initial Offset Current
vs Temperature
±15 ±30
±0.2
±0.1
±15 ±30
±0.5
±10 *
*
*
±10 *
*
±5 ±20
*
*
±5 ±20
*
* * nA
* nA/°C
* nA/V
* * nA
* nA/°C
INPUT IMPEDANCE
Differential
Common-mode
1010 || 3
1010 || 3
* * * || pF
* * * || pF
INPUT VOLTAGE RANGE
Range, Linear Response
CMR with 1kSource Imbalance
DC to 60Hz, G = 1
DC to 60Hz, G = 10
DC to 60Hz, G = 100 to 1000
±10
80
96
106
±12
90
106
110
**
**
**
**
**
**
**
**
**
65 85
90 95
100 105
V
dB
dB
dB
INPUT NOISE
Input Voltage Noise
fB = 0.01Hz to 10Hz
Density, G = 1000
fO = 10Hz
fO = 100Hz
fO = 1kHz
Input Current Noise
fB = 0.01Hz to 10Hz
Density
fO = 10Hz
fO = 100Hz
fO = 1kHz
DYNAMIC RESPONSE
Small Signal, ±3dB Flatness
G=1
G = 10
G = 100
G = 1000
Small Signal, ±1% Flatness
G=1
G = 10
G = 100
G = 1000
Full Power, G = 1 to 100
Slew Rate, G = 1 to 100
Settling Time (0.1%)
G=1
G = 100
G = 1000
Settling Time (0.01%)
G=1
G = 100
G = 1000
0.2
0.8
18
15
13
50
0.8
0.46
0.35
300
140
25
2.5
20
10
1
200
6.4
0.4
30
40
350
30
50
500
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
**
40 *
55 *
470 *
45 *
70 *
650 *
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
µV, p-p
nV/Hz
nV/Hz
nV/Hz
pA, p-p
pA/Hz
pA/Hz
pA/Hz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
Hz
kHz
V/µs
* µs
* µs
* µs
* µs
* µs
* µs
POWER SUPPLY
Rated Voltage
Voltage Range
Current, Quiescent(2)
±15
±5
±6.7
*
±20 *
±8.5 *
**
*
*
*
**
*
*
*
V
*V
* mA
TEMPERATURE RANGE(5)
Specification
Operation
Storage
–25
–55
–65
+85 –55
+125 *
+150 *
+125 *
**
**
*0
* –25
* –40
+70 °C
+85 °C
+85 °C
* Specifications same as for INA101AM, AG.
NOTES: (1) Typically the tolerance of RG will be the major source of gain error. (2) Nonlinearity is the maximum peak deviation from the best straight-line as a percentage of peak-to-peak full scale output. (3) Not including the TCR of RG. (4) Adjustable
to zero at any one gain. (5) θJC output stage = 113°C/W, θJC quiescent circuitry = 19°C/W, θCA = 83°C/W.
®
INA101
2

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PIN CONFIGURATIONS
Top View
TO-100
M Package
–In
Gain Set
1
10
9 +VCC
Offset 2
Adjust
8 Output
Offset 3
Adjust
7 Common
Gain 4 5 6 –VCC
Set
+In
Output 1
+VCC 2
–Input 3
Gain Sense 1 4
Gain Set 1 5
Offset Adj. 6
Offset Adj. 7
NC 8
SOIC
U Package
DIP
G and P Package
Output 1
+VCC 2
–Input 3
Gain Sense 1 4
Gain Set 1 5
16 Common
15 –VCC
14 +Input
Offset Adj. 6
Offset Adj. 7
13 Gain Sense 2
12 Gain Set 2
11 A2 Output
10 A1 Output
9 NC
14 Common
13 –VCC
12 +Input
11 Gain Sense 2
10 Gain Set 2
9 A2 Output
8 A1 Output
ORDERING INFORMATION
PRODUCT
INA101AM
INA101CM
INA101AG
INA101CG
INA101HP
INA101KU
INA101SG
INA101SM
PACKAGE
10-Pin Metal TO-100
10-Pin Metal TO-100
14-Pin Ceramic DIP
14-Pin Ceramic DIP
14-Pin Plastic DIP
SOL-16 Surface-Mount
14-Pin Ceramic DIP
10-Pin Metal TO-100
TEMPERATURE RANGE
–25°C to +85°C
–25°C to +85°C
–25°C to +85°C
–25°C to +85°C
0°C to +70°C
0°C to +70°C
–55°C to +125°C
–55°C to +125°C
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ................................................................................... ±20V
Power Dissipation .......................................................................... 600mW
Input Voltage Range .......................................................................... ±VCC
Output Short Circuit (to ground) ............................................... Continuous
Operating Temperature M, G Package ........................... –55°C to +125°C
P, U Package ................................................................. –25°C to +85°C
Storage Temperature M, G Package .............................. –65°C to +150°C
P, U Package ................................................................. –40°C to +85°C
Lead Temperature (soldering, 10s) M, G, P Package ................... +300°C
Lead Temperature (wave soldering, 3s) U Package ...................... +260°C
PACKAGE INFORMATION
PRODUCT
PACKAGE
PACKAGE DRAWING
NUMBER(1)
INA101AM
INA101CM
INA101AG
INA101CG
INA101HP
INA101KU
INA101SG
INA101SM
10-Pin Metal TO-100
10-Pin Metal TO-100
14-Pin Ceramic DIP
14-Pin Ceramic DIP
14-Pin Plastic DIP
SOL-16 Surface-Mount
14-Pin Ceramic DIP
10-Pin Metal TO-100
007
007
169
169
010
211
169
007
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
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.
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 INA101

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TYPICAL PERFORMANCE CURVES
At +25°C, VCC = ±15V unless otherwise noted.
0.01
GAIN NONLINEARITY vs GAIN
0.003
Max
0.001
Typ
0.0003
1
10 100
Gain (V/V)
1000
GAIN vs FREQUENCY
G = 1000
60
G = 100
40
G = 10
20
G=1
0
1% Error
100 1k 10k 100k
Frequency (Hz)
1M
120
G = 100, 1000
CMR vs FREQUENCY
G = 10
100
G=1
80
Balanced
Source
60
1 10 100 1k
Frequency (Hz)
10k
10
8
6
4
2
0
0
WARM-UP DRIFT vs TIME
1 234
Time (Minutes)
5
±9
±8
±7
±6
±5
0
QUIESCENT CURRENT vs SUPPLY
±5 ±10 ±15
Supply Voltage (V)
±20
STEP RESPONSE
G=1
+10
G = 1000
+5
0
–5
–10
0 100 200 300 400 500 600
Time (µs)
®
INA101
4

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TYPICAL PERFORMANCE CURVES (CONT)
At +25°C, VCC = ±15V unless otherwise noted.
1000
100
SETTLING TIME vs GAIN
RL = 2k
CL = 1000pF
0.01%
0.1%
1%
10
1
10 100
Gain (V/V)
1000
30
20
10
0
0
OUTPUT NOISE vs GAIN
RS = 1M
RS = 1000k
RS = 10k
RS = 0
10 100
Gain (V/V)
1000
1000
INPUT NOISE VOLTAGE
vs FREQUENCY (100 GAIN 1000)
100
10
1
0 10 100 1000
Frequency (Hz)
APPLICATION INFORMATION
Figure 1 shows the basic connections required for operation
of the INA101. (Pin numbers shown are for the TO-100
metal package.) Applications with noisy or high impedance
power supplies may require decoupling capacitors close to
the device pins as shown.
The output is referred to the output Common terminal which
is normally grounded. This must be a low-impedance con-
nection to assure good common-mode rejection. A resis-
tance greater than 0.1in series with the Common pin will
cause common-mode rejection to fall below 106dB.
SETTING THE GAIN
Gain of the INA101 is set by connecting a single external
resistor, RG:
G
=
1
+
40k
RG
(1)
The 40kterm in equation (1) comes from the sum of the
two internal feedback resistors. These are on-chip metal film
resistors which are laser trimmed to accurate absolute val-
ues. The accuracy and temperature coefficient of these
resistors are included in the gain accuracy and drift specifi-
cations of the INA101.
The stability and temperature drift of the external gain
setting resistor, RG, also affects gain. RG’s contribution to
gain accuracy and drift can be directly inferred from the gain
equation (1). Low resistor values required for high gain can
make wiring resistance important. Sockets add to the wiring
resistance which will contribute additional gain error (possi-
bly an unstable gain error) in gains of approximately 100 or
greater. The gain sense connections on the DIP and SOL-16
packages (see Figure 2) reduce the gain error produced by
wiring or socket resistance.
®
5 INA101