1995 Burr-Brown Corporation
PDS-1296C
Printed in U.S.A. October, 1996
A
1
A
2
A
3
40k
40k
40k
40k
V
IN
2
1
8
3
6
5
V
IN
R
G
V+
V
INA128, INA129
Ref
V
O
INA128:
G = 1 +
50k
R
G
INA129:
G = 1 +
49.4k
R
G
+
Over-Voltage
Protection
25k
(1)
25k
(1)
Over-Voltage
Protection
4
7
NOTE: (1) INA129: 24.7k
FEATURES
q
LOW OFFSET VOLTAGE: 50
V max
q
LOW DRIFT: 0.5
V/
C max
q
LOW INPUT BIAS CURRENT: 5nA max
q
HIGH CMR: 120dB min
q
INPUTS PROTECTED TO
40V
q
WIDE SUPPLY RANGE:
2.25 to
18V
q
LOW QUIESCENT CURRENT: 700
A
q
8-PIN PLASTIC DIP, SO-8
DESCRIPTION
The INA128 and INA129 are low power, general
purpose instrumentation amplifiers offering excellent
accuracy. Their versatile 3-op amp design and small
size make them ideal for a wide range of applications.
Current-feedback input circuitry provides wide band-
width even at high gain (200kHz at G = 100).
A single external resistor sets any gain from 1 to
10,000. INA128 provides an industry standard gain
equation; INA129's gain equation is compatible with
the AD620.
The INA128/INA129 is laser trimmed for very low
offset voltage (50
V), drift (0.5
V/
C) and high com-
mon-mode rejection (120dB at G
100). It operates
with power supplies as low as
2.25V, and quiescent
current is only 700
A--ideal for battery operated
systems. Internal input protection can withstand up to
40V without damage.
The INA128/INA129 is available in 8-pin plastic
DIP, and SO-8 surface-mount packages, specified for
the 40
C to +85
C temperature range. The INA128
is also available in dual configuration, the INA2128.
Precision, Low Power
INSTRUMENTATION AMPLIFIERS
INA128
INA129
APPLICATIONS
q
BRIDGE AMPLIFIER
q
THERMOCOUPLE AMPLIFIER
q
RTD SENSOR AMPLIFIER
q
MEDICAL INSTRUMENTATION
q
DATA ACQUISITION
INA128
INA128
INA129
INA129
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
SPECIFICATIONS
At T
A
= +25
C, V
S
=
15V, R
L
= 10k
,
unless otherwise noted.
INA128P, U
INA128PA, UA
INA129P, U
INA129PA, UA
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
T
Specification same as INA128P, U or INA129P, U.
NOTE: (1) Input common-mode range varies with output voltage--see typical curves. (2) Guaranteed by wafer test. (3) Temperature coefficient of the 50k
(or 49.4k
)
term in the gain equation. (4) Nonlinearity measurements in G = 1000 are dominated by noise. Typical nonlinearity is
0.001%.
INPUT
Offset Voltage, RTI
Initial
T
A
= +25
C
10
100/G
50
500/G
25
100/G
125
1000/G
V
vs Temperature
T
A
= T
MIN
to T
MAX
0.2
2/G
0.5
20/G
0.2
5/G
1
20/G
V/
C
vs Power Supply
V
S
=
2.25V to
18V
0.2
20/G
1
100/G
T
2
200/G
V/V
Long-Term Stability
0.1
3/G
T
V/mo
Impedance, Differential
10
10
|| 2
T
|| pF
Common-Mode
10
11
|| 9
T
|| pF
Common-Mode Voltage Range
(1)
V
O
= 0V
(V+) 2
(V+) 1.4
T
T
V
(V)
+ 2
(V) + 1.7
T
T
V
Safe Input Voltage
40
T
V
Common-Mode Rejection
V
CM
=
13V,
R
S
= 1k
G=1
80
86
73
T
dB
G=10
100
106
93
T
dB
G=100
120
125
110
T
dB
G=1000
120
130
110
T
dB
BIAS CURRENT
2
5
T
10
nA
vs Temperature
30
T
pA/
C
Offset Current
1
5
T
10
nA
vs Temperature
30
T
pA/
C
NOISE VOLTAGE, RTI
G = 1000, R
S
= 0
f = 10Hz
10
T
nV/
Hz
f = 100Hz
8
T
nV/
Hz
f = 1kHz
8
T
nV/
Hz
f
B
= 0.1Hz to 10Hz
0.2
T
Vp-p
Noise Current
f=10Hz
0.9
T
pA/
Hz
f=1kHz
0.3
T
pA/
Hz
f
B
= 0.1Hz to 10Hz
30
T
pAp-p
GAIN
Gain Equation, INA128
1 + (50k
/R
G
)
T
V/V
INA129
1 + (49.4k
/R
G
)
T
V/V
Range of Gain
1
10000
T
T
V/V
Gain Error
G=1
0.01
0.024
T
0.1
%
G=10
0.02
0.4
T
0.5
%
G=100
0.05
0.5
T
0.7
%
G=1000
0.5
1
T
2
%
Gain vs Temperature
(2)
G=1
1
10
T
T
ppm/
C
50k
(or 49.4k
) Resistance
(2, 3)
25
100
T
T
ppm/
C
Nonlinearity
V
O
=
13.6V, G=1
0.0001
0.001
T
0.002
% of FSR
G=10
0.0003
0.002
T
0.004
% of FSR
G=100
0.0005
0.002
T
0.004
% of FSR
G=1000
0.001
(Note 4)
T
T
% of FSR
OUTPUT
Voltage: Positive
R
L
= 10k
(V+) 1.4
(V+) 0.9
T
T
V
Negative
R
L
= 10k
(V) + 1.4
(V) + 0.8
T
T
V
Load Capacitance Stability
1000
T
pF
Short-Circuit Current
+6/15
T
mA
FREQUENCY RESPONSE
Bandwidth, 3dB
G=1
1.3
T
MHz
G=10
700
T
kHz
G=100
200
T
kHz
G=1000
20
T
kHz
Slew Rate
V
O
=
10V, G=10
4
T
V/
s
Settling Time, 0.01%
G=1
7
T
s
G=10
7
T
s
G=100
9
T
s
G=1000
80
T
s
Overload Recovery
50% Overdrive
4
T
s
POWER SUPPLY
Voltage Range
2.25
15
18
T
T
T
V
Current, Total
V
IN
= 0V
700
750
T
T
A
TEMPERATURE RANGE
Specification
40
85
T
T
C
Operating
40
125
T
T
C
JA
8-Pin Dip
80
T
C/W
SO-8 SOIC
150
T
C/W
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.
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.
ORDERING INFORMATION
PACKAGE
DRAWING
TEMPERATURE
PRODUCT
PACKAGE
NUMBER
(1)
RANGE
INA128PA
8-Pin Plastic DIP
006
40
C to +85
C
INA128P
8-Pin Plastic DIP
006
40
C to +85
C
INA128UA
SO-8 Surface-Mount
182
40
C to +85
C
INA128U
SO-8 Surface-Mount
182
40
C to +85
C
INA129PA
8-Pin Plastic DIP
006
40
C to +85
C
INA129P
8-Pin Plastic DIP
006
40
C to +85
C
INA129UA
SO-8 Surface-Mount
182
40
C to +85
C
INA129U
SO-8 Surface-Mount
182
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.
PIN CONFIGURATION
8-Pin DIP and SO-8
R
G
V
IN
V
+
IN
V
R
G
V+
V
O
Ref
1
2
3
4
8
7
6
5
Top View
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
ABSOLUTE MAXIMUM RATINGS
TYPICAL PERFORMANCE CURVES
At T
A
= +25
C, V
S
=
15V, unless otherwise noted.
COMMON-MODE REJECTION vs FREQUENCY
Frequency (Hz)
Common-Mode Rejection (dB)
10
100
10k
1M
1k
140
120
100
80
60
40
20
0
100k
G = 1V/V
G = 10V/V
G = 100V/V
G = 1000V/V
POSITIVE POWER SUPPLY REJECTION
vs FREQUENCY
Frequency (Hz)
Power Supply Rejection (dB)
140
120
100
80
60
40
20
0
10
100
1k
10k
100k
1M
G = 100V/V
G = 1000V/V
G = 1V/V
G = 10V/V
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE, V
S
= 5, 2.5V
Output Voltage (V)
Common-Mode Voltage (V)
5
5
4
3
2
1
0
1
2
3
4
5
4
3
2
1
0
1
2
3
4
5
V
S
= 5V
V
S
= 2.5V
G = 1
G = 1
G
10
G
10
G
10
G = 1
NEGATIVE POWER SUPPLY REJECTION
vs FREQUENCY
Frequency (Hz)
Power Supply Rejection (dB)
140
120
100
80
60
40
20
0
10
100
1k
10k
100k
1M
G = 100V/V
G = 1000V/V
G = 1V/V
G = 10V/V
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE, V
S
= 15V
Output Voltage (V)
Common-Mode Voltage (V)
15
10
0
5
15
5
15
10
5
0
5
10
15
10
G = 1
G = 1
G
10
G
10
V
D/2
+
+
V
CM
V
O
V
D/2
Ref
15V
+15V
+
GAIN vs FREQUENCY
60
50
40
30
20
10
0
10
20
Gain (dB)
Frequency (Hz)
1k
10k
100k
1M
10M
G = 100V/V
G = 10V/V
G = 1V/V
G = 1000V/V
INPUT OVER-VOLTAGE V/I CHARACTERISTICS
5
4
3
2
1
0
1
2
3
4
5
Input Current (mA)
Input Voltage (V)
50
40
30
20
10
10
20
30
40
0
50
G = 1V/V
G = 1V/V
G = 1000V/V
G = 1000V/V
V
IN
I
IN
15V
+15V
Flat region represents
normal linear operation.
TYPICAL PERFORMANCE CURVES
(CONT)
At T
A
= +25
C, V
S
=
15V, unless otherwise noted.
INPUT- REFERRED NOISE vs FREQUENCY
Frequency (Hz)
Input-Referred Voltage Noise (nV/
Hz)
1
10
1k
100
1k
100
10
1
10k
G = 1V/V
G = 10V/V
100
10
1
0.1
Input Bias Current Noise (pA/
Hz)
Current Noise
G = 100, 1000V/V
SETTLING TIME vs GAIN
Gain (V/V)
Settling Time (s)
100
10
1
1
10
100
1000
0.01%
0.1%
INPUT OFFSET VOLTAGE WARM-UP
10
8
6
4
2
0
2
4
6
8
10
0
100
200
300
400
500
Time (s)
Offset Voltage Change (V)
INPUT BIAS CURRENT vs TEMPERATURE
2
1
0
1
2
75
50
25
0
25
50
75
100
125
Temperature (C)
Input Bias Current (nA)
I
OS
I
B
Typical I
B
and I
OS
Range 2nA at 25C
QUIESCENT CURRENT and SLEW RATE
vs TEMPERATURE
Temperature (C)
Quiescent Current (A)
0.85
0.8
0.75
0.7
0.65
0.6
6
5
4
3
2
1
75
50
25
0
25
50
75
100
125
Slew Rate (V/s)
I
Q
Slew Rate
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