INA131BP [TI]
Precision G = 100 INSTRUMENTATION AMPLIFIER;
| 型号： | INA131BP |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Precision G = 100 INSTRUMENTATION AMPLIFIER 放大器 |
| 文件： | 总11页 (文件大小：136K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
INA131
INA131
Precision G = 100
INSTRUMENTATION AMPLIFIER
DESCRIPTION
FEATURES
The INA131 is a low cost, general purpose G = 100
instrumentation amplifier offering excellent accuracy.
Its 3-op amp design and small size make it ideal for
a wide range of applications.
● LOW OFFSET VOLTAGE: 50µV max
● LOW DRIFT: 0.25µV/°C max
● LOW INPUT BIAS CURRENT: 2nA max
● HIGH COMMON-MODE REJECTION:
On-chip laser trimmed resistors accurately set a fixed
gain of 100. The INA131 is laser trimmed to achieve
very low offset voltage (50µV max), drift (0.25µV/°C
max), and high CMR (110dB min). Internal input
protection can withstand up to ±40V inputs without
damage.
110dB min
● INPUT OVERVOLTAGE PROTECTION:
±40V
● WIDE SUPPLY RANGE: ±2.25 to ±18V
● LOW QUIESCENT CURRENT: 3mA
● 8-PIN PLASTIC DIP
The INA131 is available in a 8-pin plastic DIP. They
are specified over the –40°C to +85°C temperature
range.
APPLICATIONS
● BRIDGE AMPLIFIER
● THERMOCOUPLE AMPLIFIER
● RTD SENSOR AMPLIFIER
● MEDICAL INSTRUMENTATION
● DATA ACQUISITION
V+
7
INA131
–
VIN
2
1
Over-Voltage
Protection
A1
5kΩ
25kΩ
25kΩ
25kΩ
6
5
+
–
A3
VO = 100 (VIN – VIN
)
2.63kΩ
8
3
A2
Ref
+
VIN
Over-Voltage
Protection
5kΩ
25kΩ
4
DIP
V–
International Airport Industrial Park
•
Mailing Address: PO Box 11400, Tucson, AZ 85734
FAXLine: (800) 548-6133 (US/Canada Only)
•
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
©1992 Burr-Brown Corporation
PDS-1144E
Printed in U.S.A. March, 1998
SBOS016
SPECIFICATIONS
At TA = +25°C, VS = ±15V, RL = 2kΩ, unless otherwise noted.
INA131BP
TYP
INA131AP
TYP
PARAMETER
CONDITIONS
MIN
MAX
MIN
MAX
UNITS
INPUT
Offset Voltage, RTI
Initial
vs Temperature
vs Power Supply
Long-Term Stability
Impedance, Differential
Common-Mode
Input Common-Mode Range
Safe Input Voltage
T
A = +25°C
A = TMIN to TMAX
S = ±2.25V to ±18V
±10
±0.1
0.5
±50
±0.25
3
±25
±0.25
✻
✻
✻
±125
±1
✻
µV
µV/°C
µV/V
µV/mo
Ω || pF
Ω || pF
V
T
V
0.2
1010 || 6
1010 || 6
±13.5
✻
✻
±11
✻
±40
±2
✻
±5
±5
V
dB
Common-Mode Rejection
V
CM = ±10V, ∆RS = 1kΩ
110
120
106
110
BIAS CURRENT
vs Temperature
±0.5
±8
✻
✻
nA
pA/°C
OFFSET CURRENT
vs Temperature
±0.5
±8
±2
✻
✻
nA
pA/°C
NOISE VOLTAGE, RTI
f = 10Hz
f = 100Hz
f = 1kHz
f = 10kHz
RS = 0Ω
16
12
12
12
0.4
✻
✻
✻
✻
✻
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
µVp-p
f
B = 0.1Hz to 10Hz
Noise Current
f = 10Hz
f= 1kHz
0.4
0.2
18
✻
✻
✻
pA/√Hz
pA/√Hz
pAp-p
f
B = 0.1Hz to 100Hz
GAIN
Gain Error(1)
Resistor Value(2)
±0.01
±10
±0.024
±40
✻
✻
±0.1
✻
%
%
Gain vs Temperature
Nonlinearity
±5
±0.0003
±10
±0.002
✻
✻
±20
±0.004
ppm/°C
% of FSR
OUTPUT
Voltage
I
V
V
O = 5mA, TMIN to TMAX
S = ±11.4V, RL = 2kΩ
S = ±2.25V, R L= 2kΩ
Stable Operation
±13.5
±10
±1
±13.7
10.5
1.5
1000
+20/–15
✻
✻
✻
✻
✻
✻
✻
✻
V
V
V
pF
mA
Load Capacitance, max
Short Circuit Current
FREQUENCY RESPONSE
Bandwidth, –3dB
Slew Rate
Settling Time, 0.01%
Overload Recovery
70
0.7
100
20
✻
✻
✻
✻
kHz
V/µs
µs
V
O = ±10V
0.3
✻
✻
50% Overdrive
µs
POWER SUPPLY
Voltage Range
Current
±2.25
±15
±2.2
±18
±3
✻
✻
✻
✻
V
mA
V
IN = 0V
TEMPERATURE RANGE
Specification
Operating
–40
–40
85
125
✻
✻
✻
✻
°C
°C
θJA
100
✻
°C/W
✻ Specification same as INA131BP.
NOTES: (1) RL = 10kΩ. (2) Absolute value of internal gain-setting resistors. (Gain depends on resistor ratios.)
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.
®
2
INA131
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Top View
P-Package/8-Pin DIP
Supply Voltage .................................................................................. ±18V
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
RG
1
2
3
4
8
7
6
5
RG
V+
VO
Ref
V–
IN
IN
V+
NOTE: (1) Stresses above these ratings may cause permanent damage.
V–
ELECTROSTATIC
DISCHARGE SENSITIVITY
PACKAGE/ORDERING INFORMATION
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.
PACKAGE
DRAWING
TEMPERATURE
RANGE
PRODUCT
PACKAGE
NUMBER(1)
INA131AP
INA131BP
8-Pin Plastic DIP
8-Pin Plastic DIP
006
006
–40°C to +85°C
–40°C to +85°C
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.
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
®
3
INA131
TYPICAL PERFORMANCE CURVES
At 25°C, VS = ±15V, unless otherwise noted.
COMMON-MODE REJECTION vs FREQUENCY
GAIN vs FREQUENCY
60
140
120
100
80
40
20
60
40
0
20
0
–20
10
100
1k
10k
100k
1M
100
1k
10k
100k
1M
10M
Frequency (Hz)
Frequency (Hz)
INPUT COMMON-MODE VOLTAGE RANGE
vs OUTPUT VOLTAGE
POWER SUPPLY REJECTION
vs FREQUENCY
15
140
120
100
80
Negative Supply
10
5
–
VD/2
VD/2
VCM
VO
+
–
+
0
Positive Supply
60
A3 – Output
Swing Limit
A3 + Output
Swing Limit
–5
–10
–15
40
20
0
–15
–10
–5
0
5
10
15
10
100
1k
10k
100k
1M
Output Voltage (V)
Frequency (Hz)
INPUT- REFERRED NOISE VOLTAGE
vs FREQUENCY
OFFSET VOLTAGE WARM-UP vs TIME
100
10
1
6
4
2
0
–2
–4
–6
1
10
100
1k
10k
0
15
30
45
60
75
90
105
120
Frequency (Hz)
Time from Power Supply Turn-on (s)
®
4
INA131
TYPICAL PERFORMANCE CURVES (CONT)
At 25°C, VS = ±15V, unless otherwise noted.
INPUT BIAS AND INPUT OFFSET CURRENT
vs TEMPERATURE
INPUT BIAS CURRENT
vs INPUT VOLTAGE
2
1
3
2
1
±IB
Common-Mode
(|IB1| + |IB2|)
0
0
Differential Mode
IOS
–1
–2
–3
–1
–2
–40
–15
10
35
60
85
–45
–30
–15
0
15
30
45
Temperature (°C)
Differential Overload Voltage (V)
MAXIMUM OUTPUT SWING vs FREQUENCY
SLEW RATE vs TEMPERATURE
32
28
24
20
16
12
8
1.2
1.0
0.8
0.6
0.4
0.2
4
0
10
100
1k
10k
100k
1M
–75
–50
–25
0
25
50
75
100
125
Frequency (Hz)
Temperature (°C)
OUTPUT CURRENT LIMIT vs TEMPERATURE
QUIESCENT CURRENT vs TEMPERATURE
30
25
20
15
10
2.8
2.6
2.4
2.2
2.0
1.8
+|ICL
|
–|ICL
|
–40
–15
10
35
60
85
–75
–50
–25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
®
5
INA131
TYPICAL PERFORMANCE CURVES (CONT)
At 25°C, VS = ±15V, unless otherwise noted.
QUIESCENT CURRENT AND POWER DISSIPATION
vs POWER SUPPLY VOLTAGE
POSITIVE SIGNAL SWING vs TEMPERATUE (RL = 2kΩ)
2.6
2.5
2.4
2.3
2.2
2.1
2.0
120
100
80
60
40
20
0
16
14
12
10
8
VS = ±15V
VS = ±11.4V
Power Dissipation
Quiescent Current
6
4
VS = ±2.25V
2
0
0
±3
±6
±9
±12
±15
±18
–75
–50
–25
0
25
50
75
100
125
Power Supply Voltage (V)
Temperature (°C)
LARGE SIGNAL RESPONSE, G = 100
NEGATIVE SIGNAL SWING vs TEMPERATUE (RL = 2kΩ)
–16
–14
–12
–10
–8
VS = ±15V
+10V
0
VS = ±11.4V
–6
–4
–10V
VS = ±2.25V
–2
0
–75
–50
–25
0
25
50
75
100
125
Temperature (°C)
SMALL SIGNAL RESPONSE, G = 100
INPUT-REFERRED NOISE, 0.1 to 10Hz
+200mV
0.1µV/div
0
–200mV
1s/div
®
6
INA131
device. Absolute accuracy of the internal values is ±40%.
The nominal gain with an external RG resistor can be
calculated by:
APPLICATION INFORMATION
Figure 1 shows the basic connections required for operation
of the INA131. Applications with noisy or high impedance
power supplies may require decoupling capacitors close to
the device pins as shown.
250 kΩ
(1)
G = 100 +
RG
The output is referred to the output reference (Ref) terminal
which is normally grounded. This must be a low-impedance
connection to assure good common-mode rejection. A resis-
tance of 5Ω in series with the Ref pin will cause a device
with 110dB CMR to degrade to approximately 106dB CMR.
Where: RG is the external gain resistor.
Accuracy of the 250kΩ term is ±40%.
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).
SETTING THE GAIN
No external resistors are required for G = 100. On-chip
laser-trimmed resistors set the gain, providing excellent gain
accuracy and temperature stability. Gain is distributed be-
tween the input and output stages of the INA131. Bandwidth
is increased by approximately five times (compared to the
INA114 in G = 100). Input common-mode range is also
improved (see “Input Common-Mode Range”).
NOISE PERFORMANCE
The INA131 provides very low noise in most applications.
For differential source impedances less than 1kΩ, the
INA103 may provide lower noise. For source impedances
greater than 50kΩ, the INA111 FET-Input Instrumentation
Amplifier may provide lower noise.
Although the INA131 is primarily intended for fixed
G = 100 applications, the gain can be increased by connect-
ing an external resistor to the RG pins. The internal resistors
are trimmed for precise ratios, not to absolute values, so the
influence of an external resistor will vary from device to
Low frequency noise of the INA131 is approximately
0.4µVp-p measured from 0.1 to 10Hz. This is approxi-
mately one-tenth the noise of state-of-the-art chopper-stabi-
lized amplifiers.
V+
0.1µF
Pin numbers are
for DIP packages.
7
INA131
–
VIN
2
1
Over-Voltage
Protection
A1
5kΩ
25kΩ
VO = 100 • (VI+N – VIN–
)
25kΩ
25kΩ
6
5
A3
2.63kΩ
+
8
3
VO
Load
–
A2
+
VIN
Over-Voltage
Protection
5kΩ
25kΩ
4
0.1µF
Also drawn in simplified form:
V–
–
VIN
INA131
VO
+
Ref
VIN
FIGURE 1. Basic Connections.
®
7
INA131
OFFSET TRIMMING
The INA131 is laser trimmed for very low offset voltage and
drift. Most applications require no external offset adjust-
ment. Figure 2 shows an optional circuit for trimming the
output offset voltage. The voltage applied to Ref terminal is
summed at the output. Low impedance must be maintained
at this node to assure good common-mode rejection. This is
achieved by buffering trim voltage with an op amp as
shown.
Microphone,
Hydrophone
etc.
INA131
47kΩ
47kΩ
Thermocouple
INA131
–
V+
VIN
VO
INA131
100µA
+
10kΩ
VIN
1/2 REF200
Ref
100Ω
100Ω
OPA177
±10mV
Adjustment Range
10kΩ
INA131
Center-tap provides
bias current return.
100µA
1/2 REF200
FIGURE3. ProvidinganInputCommon-ModeCurrent Path.
V–
FIGURE 2. Optional Trimming of Output Offset Voltage.
INA114 and other unity output gain instrumentation ampli-
fiers, the INA131 provides several additional volts of input
common-mode range with full output voltage swing. See the
typical performance curve “Input Common-Mode Range vs
Output Voltage”.
INPUT BIAS CURRENT RETURN PATH
The input impedance of the INA131 is extremely high—
approximately 1010Ω. However, a path must be provided for
the input bias current of both inputs. This input bias current
is typically less than ±1nA (it can be either polarity due to
cancellation circuitry). High input impedance means that
this input bias current changes very little with varying input
voltage.
Input-overload often produces an output voltage that appears
normal. For example, an input voltage of +20V on one input
and +40V on the other input will obviously exceed the linear
common-mode range of both input amplifiers. Since both
input amplifiers are saturated to the nearly the same output
voltage limit, the difference voltage measured by the output
amplifier will be near zero. The output of the INA131 will
be near 0V even though both inputs are overloaded.
Input circuitry must provide a path for this input bias current
if the INA131 is to operate properly. Figure 3 shows various
provisions for an input bias current path. Without a bias
current return path, the inputs will float to a potential which
exceeds the common-mode range of the INA131 and the
input amplifiers will saturate. If the differential source resis-
tance is low, bias current return path can be connected to one
input (see thermocouple example in Figure 3). With higher
source impedance, using two resistors provides a balanced
input with possible advantages of lower input offset voltage
due to bias current and better common-mode rejection.
INPUT PROTECTION
The inputs of the INA131 are individually protected for
voltages up to ±40V. For example, a condition of –40V on
one input and +40V on the other input will not cause
damage. Internal circuitry on each input provides low series
impedance under normal signal conditions. To provide
equivalent protection, series input resistors would contribute
excessive noise. If the input is overloaded, the protection
circuitry limits the input current to a safe value (approxi-
mately 1.5mA). The typical performance curve “Input Bias
Current vs Input Voltage” shows this input current limit
behavior. The inputs are protected even if no power supply
voltage is present.
INPUT COMMON-MODE RANGE
The linear common-mode range of the input op amps of the
INA131 is approximately ±13.75V (or 1.25V from the
power supplies). As the output voltage increases, however,
the linear input range is limited by the output voltage swing
of the input amplifiers, A1 and A2. The 5V/V output stage
gain of the INA131 reduces this effect. Compared to the
®
8
INA131
VI–N
VI+N
VO
1MΩ
1MΩ
INA131
Ref
Shield is driven at the
common-mode potential.
100Ω
Common-mode resistors have
approximately 0.1% effect
on gain.
OPA602
FIGURE 4. Shield Driver Circuit.
V+
V+
REF200
100µA
Equal line resistance here creates
a small common-mode voltage
which is rejected by INA131.
1
VO
RTD
INA131
Ref
2
RZ
3
VO = 0V at RRTD = RZ
Resistance in this line causes
a small common-mode voltage
which is rejected by INA131.
FIGURE 5. RTD Temperature Measurement Circuit.
V+
2
10.0V
R4
6
REF102
R1
27kΩ
80.6kΩ
4
R(72)
1N4148
R2
(1)
1MΩ
5.23k
Ω
VO
Cu
Cu
INA131
Ref
K
R5
R3
50Ω
100Ω
R6
SEEBECK
COEFFICIENT
(µV/°C)
100Ω
Zero Adj
ISA
R2
R4
TYPE
MATERIAL
(R3 = 100Ω)
(R5 + R6 = 100Ω)
E
J
Chromel
Constantan
58.5
50.2
39.4
38.0
3.48kΩ
56.2kΩ
Iron
Constantan
4.12kΩ
5.23kΩ
5.49kΩ
64.9kΩ
80.6kΩ
84.5kΩ
K
T
Chromel
Alumel
Copper
Constantan
NOTES: (1) –2.1mV/°C at 200µA. (2) R7 provides down-scale burn-out indication.
FIGURE 6. Thermocouple Amplifier with Cold Junction Compensation.
9
®
INA131
+10V
100 • VIN
R
–
R
IO
=
VIN
+
INA131
Ref
Bridge
IB
VO
INA131
A1
IO
Ref
Load
FIGURE 7. Bridge Transducer Amplifier.
A1
IB Error
OPA177
OPA602
OPA128
±1.5nA
1pA
75fA
–
VO
VIN
+
INA131
Ref
FIGURE 9. Differential Voltage to Current Converter.
R1
1MΩ
C1
0.1µF
1
f–3dB
=
2πR1C1
= 1.59Hz
OPA602
FIGURE 8. AC-Coupled Instrumentation Amplifier.
®
10
INA131
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 2000, Texas Instruments Incorporated
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