INA
212
8
INA2128
INA
212
8
SBOS035A – DECEMBER 1995 – REVISED APRIL 2007
Dual, Low Power
INSTRUMENTATION AMPLIFIER
FEATURES
q
LOW OFFSET VOLTAGE: 50
µ
V max
q
LOW DRIFT: 0.5
µ
V/
°
C max
q
LOW INPUT BIAS CURRENT: 5nA max
q
HIGH CMR: 120dB min
q
q
q
q
INPUTS PROTECTED TO
±
40V
WIDE SUPPLY RANGE:
±
2.25V to
±
18V
LOW QUIESCENT CURRENT: 700
µ
A / IA
16-PIN PLASTIC DIP, SOL-16
DESCRIPTION
The INA2128 is a dual, low power, general purpose instrumen-
tation amplifier offering excellent accuracy. Its versatile
3-op amp design and small size make it ideal for a wide range
of applications. Current-feedback input circuitry provides wide
bandwidth even at high gain (200kHz at G = 100).
A single external resistor sets any gain from 1 to 10,000.
Internal input protection can withstand up to
±40V
without
damage.
The INA2128 is laser-trimmed for very low offset voltage
(50µV), drift (0.5µV/°C) and high common-mode rejection
(120dB at G
≥
100). It operates with power supplies as low as
±2.25V,
and quiescent current is only 700µA per IA—ideal for
battery-operated and multiple-channel systems.
The INA2128 is available in SOL-16 packages, specified
for the –40°C to +85°C temperature range.
APPLICATIONS
q
SENSOR AMPLIFIER
THERMOCOUPLE, RTD, BRIDGE
q
MEDICAL INSTRUMENTATION
q
MULTIPLE-CHANNEL SYSTEMS
q
BATTERY OPERATED EQUIPMENT
V+
9
V
INA
–
1
3
Over-Voltage
Protection
INA2128
A
1A
40kΩ
25kΩ
A
3A
6
40kΩ
7
G
A
= 1 + 50kΩ
R
GA
V
OA
R
GA
4
+
V
INA
–
25kΩ
Over-Voltage
Protection
Over-Voltage
Protection
2
A
2A
40kΩ
40kΩ
5
Ref
A
V
INB
16
14
A
1B
40kΩ
25kΩ
A
3B
40kΩ
10
G
B
= 1 +
11
50kΩ
R
GB
R
GB
13
+
V
INB
V
OB
25kΩ
Over-Voltage
Protection
15
A
2B
40kΩ
8
V–
40kΩ
12
Ref
B
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1995-2007, Texas Instruments Incorporated
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage ..................................................................................
±18V
Analog Input Voltage Range .............................................................
±40V
Output Short-Circuit (to ground) .............................................. Continuous
Operating Temperature .................................................. –40°C to +125°C
Storage Temperature ..................................................... –55°C to +125°C
Junction Temperature .................................................................... +150°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. Texas Instru-
ments 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.
PIN CONFIGURATION
Top View
SOIC
–
V
INA
+
V
INA
1
2
3
4
5
6
7
8
–
16 V
INB
+
15 V
INB
ORDERING INFORMATION
(1)
PACKAGE
TEMPERATURE
DESIGNATOR
RANGE
DW
DW
–40°C to +85°C
–40°C to +85°C
R
GA
R
GA
Ref
A
V
OA
Sense
A
V–
14 R
GB
13 R
GB
12 Ref
B
11 V
OB
10 Sense
B
9
V+
PRODUCT
INA2128UA
INA2128U
PACKAGE-LEAD
SOIC-16
SOIC-16
NOTES: (1) For the most current package and ordering information, see the
Package Option Addendum at the end of this document, or see the TI web site
at www.ti.com.
2
INA2128
www.ti.com
SBOS035A
ELECTRICAL CHARACTERISTICS
At T
A
= +25°C, V
S
=
±15V,
R
L
= 10kΩ, unless otherwise noted.
INA2128U
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
INA2128UA
TYP
MAX
UNITS
INPUT
Offset Voltage, RTI
Initial
T
A
= +25°C
vs Temperature
T
A
= T
MIN
to T
MAX
vs Power Supply
V
S
=
±2.25V
to
±18V
Long-Term Stability
Impedance, Differential
Common-Mode
V
O
= 0V
Common-Mode Voltage Range
(1)
Safe Input Voltage
Common-Mode Rejection
V
CM
=
±13V, ∆R
S
= 1kΩ
G=1
G=10
G=100
G=1000
(V+) – 2
(V–) + 2
±10 ±100/G
±0.2 ±
2/G
±0.2 ±20/G
±0.1 ±3/G
10
10
|| 2
10
11
|| 9
(V+) – 1.4
(V–) + 1.7
±50 ±500/G
±0.5 ±
20/G
±1 ±100/G
±40
✻
✻
±25 ±100/G ±125 ±1000/G
±0.2 ±
5/G
±1 ±
20/G
✻
±2 ±200/G
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
±10
±10
µV
µV/°C
µV/V
µV/mo
Ω
|| pF
Ω
|| pF
V
V
V
dB
dB
dB
dB
nA
pA/°C
nA
pA/°C
nV/√Hz
nV/√Hz
nV/√Hz
µV
PP
pA/√Hz
pA/√Hz
pA
PP
V/V
V/V
%
%
%
%
ppm/°C
ppm/°C
% of FSR
% of FSR
% of FSR
% of FSR
V
V
pF
mA
MHz
kHz
kHz
kHz
V/µs
µs
µs
µs
µs
µs
80
100
120
120
86
106
125
130
±2
±30
±1
±30
±5
±5
73
93
110
110
BIAS CURRENT
vs Temperature
Offset Current
vs Temperature
NOISE VOLTAGE, RTI
f = 10Hz
f = 100Hz
f = 1kHz
f
B
= 0.1Hz to 10Hz
Noise Current
f=10Hz
f=1kHz
f
B
= 0.1Hz to 10Hz
GAIN
Gain Equation
Range of Gain
Gain Error
G = 1000, R
S
= 0Ω
10
8
8
0.2
0.9
0.3
30
1 + (50kΩ/R
G
)
1
G=1
G=10
G=100
G=1000
G=1
V
O
=
±13.6V,
G=1
G=10
G=100
G=1000
R
L
= 10kΩ
R
L
= 10kΩ
(V+) – 1.4
(V–) + 1.4
±0.01
±0.02
±0.05
±0.5
±1
±25
±0.0001
±0.0003
±0.0005
±0.001
(V+) – 0.9
(V–) + 0.8
1000
+6/–15
1.3
700
200
20
4
7
7
9
80
4
±2.25
V
IN
= 0V
–40
–40
80
±15
±1.4
±18
±1.5
85
125
✻
10000
±0.024
±0.4
±0.5
±1
±10
±100
±0.001
±0.002
±0.002
(Note 4)
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
Gain vs Temperature
(2)
50kΩ Resistance
(2, 3)
Nonlinearity
✻
±0.1
±0.5
±0.7
±2
✻
✻
±0.002
±0.004
±0.004
✻
OUTPUT
Voltage: Positive
Negative
Load Capacitance Stability
Short-Circuit Current
FREQUENCY RESPONSE
Bandwidth, –3dB
Slew Rate
Settling Time, 0.01%
Overload Recovery
POWER SUPPLY
Voltage Range
Current, Total
TEMPERATURE RANGE
Specification
Operating
θ
JA
G=1
G=10
G=100
G=1000
V
O
=
±10V,
G=10
G=1
G=10
G=100
G=1000
50% Overdrive
✻
✻
✻
✻
V
mA
°C
°C
°C/W
✻
✻
✻
✻
Specification same as INA2128P, U.
NOTE: (1)
(2)
(3)
(4)
Input common-mode range varies with output voltage—see Electrical Characteristics.
Ensured by wafer test.
Temperature coefficient of the
50k
Ω
term in the gain equation.
Nonlinearity measurements in G = 1000 are dominated by noise. Typical nonlinearity is
±0.001%.
INA2128
SBOS035A
www.ti.com
3
TYPICAL CHARACTERISTICS
At T
A
= +25°C, V
S
=
±15V,
unless otherwise noted.
GAIN vs FREQUENCY
60
G = 1000V/V
COMMON-MODE REJECTION vs FREQUENCY
140
G = 1000V/V
G = 100V/V
G = 10V/V
100
G = 1V/V
80
60
40
20
0
Common-Mode Rejection (dB)
50
40
G = 100V/V
120
Gain (dB)
30
20
10
0
–10
–20
1k
10k
100k
Frequency (Hz)
1M
10M
G = 1V/V
G = 10V/V
10
100
1k
10k
100k
1M
Frequency (Hz)
POSITIVE POWER SUPPLY REJECTION
vs FREQUENCY
140
120
Power Supply Rejection (dB)
140
120
NEGATIVE POWER SUPPLY REJECTION
vs FREQUENCY
G = 1000V/V
G = 100V/V
G = 1000V/V
G = 100V/V
Power Supply Rejection (dB)
100
80
60
40
20
0
10
100
1k
10k
G = 10V/V
G = 1V/V
100
80
60
40
G = 10V/V
20
G = 1V/V
0
100k
1M
10
100
1k
10k
100k
1M
Frequency (Hz)
Frequency (Hz)
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE, V
S
= ±15V
15
Common-Mode Voltage (V)
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE, V
S
= ±5, ±2.5V
G
≥
10
Common-Mode Voltage (V)
G
≥
10
5
4
3
2
1
0
–1
–2
–3
–4
V
S
= ±5V
V
S
= ±2.5V
–4
–3
–2
–1
0
1
2
3
4
5
G=1
G
≥
10
G=1
G=1
G
≥
10
G
≥
10
10
G=1
5
0
–5
–10
–15
–15
+
G=1
–
+
–
+
+15V
V
O
Ref
–15V
V
D/2
V
D/2
V
CM
–10
–5
0
5
10
15
–5
–5
Output Voltage (V)
Output Voltage (V)
4
INA2128
www.ti.com
SBOS035A
TYPICAL CHARACTERISTICS
At T
A
= +25°C, V
S
=
±15V,
unless otherwise noted.
(Continued)
CROSSTALK vs FREQUENCY
G = 1000V/V
G = 10V/V
100
Crosstalk (dB)
80
60
40
20
0
10
100
1k
10k
100k
1M
Frequency (Hz)
G = 1V/V
G = 1000V/V
G = 100V/V
G = 100V/V
INPUT- REFERRED NOISE vs FREQUENCY
Input-Referred Voltage Noise (nV/√ Hz)
140
120
1k
100
G = 1V/V
100
10
G = 10V/V
10
G = 100, 1000V/V
Current Noise
1
1
10
100
Frequency (Hz)
1k
10k
0.1
1
SETTLING TIME vs GAIN
100
0.01%
QUIESCENT CURRENT and SLEW RATE
vs TEMPERATURE
1.7
6
Quiescent Current (µA)
1.6
5
Settling Time (µs)
0.1%
10
1.5
Slew Rate
4
1.4
I
Q
1.3
3
2
1
1
10
Gain (V/V)
100
1000
1.2
–75
–50
–25
0
25
50
75
100
Temperature (°C)
1
125
INPUT OVER-VOLTAGE V/I CHARACTERISTICS
5
4
3
OFFSET VOLTAGE WARM-UP
10
8
Offset Voltage Change (µV)
Input Current (mA)
2
1
0
–1
–2
–3
–4
–5
Flat region represents
normal linear operation.
6
4
2
0
–2
–4
–6
–8
–10
G = 1000V/V
G = 1V/V
G = 1V/V
+15V
1/2
INA2128
G = 1000V/V
V
IN
I
IN
10
–15V
30
40
50
–50 –40 –30
–20 –10
0
20
0
10
20
30
40
50
Input Voltage (V)
Time (ms)
INA2128
SBOS035A
Slew Rate (V/µs)
www.ti.com
Input Bias Current Noise (pA/√ Hz)
5
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