BURR-BROWN INA131 User Manual

®

INA131

Precision G = 100

INSTRUMENTATION AMPLIFIER

INA131

FEATURES

● LOW OFFSET VOLTAGE: 50µV max

● LOW DRIFT: 0.25µV/°C max

● LOW INPUT BIAS CURRENT: 2nA max

● HIGH COMMON-MODE REJECTION:

110dB min

● INPUT OVERVOLTAGE PROTECTION:

±40V

● WIDE SUPPLY RANGE: ±2.25 to ±18V

● LOW QUIESCENT CURRENT: 3mA

● 8-PIN PLASTIC DIP

APPLICATIONS

● BRIDGE AMPLIFIER

● THERMOCOUPLE AMPLIFIER

● RTD SENSOR AMPLIFIER

● MEDICAL INSTRUMENTATION

● DATA ACQUISITION

–

2

V

IN

Over-Voltage

1

8

Protection

2.63kΩ

A

1

25kΩ

25kΩ

DESCRIPTION

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.

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.

The INA131 is available in a 8-pin plastic DIP. They
are specified over the –40°C to +85°C temperature
range.

V+

7

INA131

25kΩ5kΩ

A

3

6

V

O

+–

= 100 (VIN – VIN)

SBOS016

A

+

3

V

IN

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

©

1992 Burr-Brown Corporation PDS-1144E Printed in U.S.A. March, 1998

Over-Voltage

Protection

2

25kΩ5kΩ

4

DIP

V–

5

Ref

SPECIFICATIONS

At TA = +25°C, VS = ±15V, RL = 2kΩ, unless otherwise noted.

INA131BP INA131AP
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
INPUT

Offset Voltage, RTI
Initial T
vs Temperature T
vs Power Supply V
Long-Term Stability 0.2 ✻ µV/mo
Impedance, Differential 10
Common-Mode 10
Input Common-Mode Range ±11 ±13.5 ✻✻ V
Safe Input Voltage ±40 ✻ V
Common-Mode Rejection V

BIAS CURRENT ±0.5 ±2 ✻ ±5nA
vs Temperature ±8 ✻ pA/°C

OFFSET CURRENT ±0.5 ±2 ✻ ±5nA
vs Temperature ±8 ✻ pA/°C

NOISE VOLTAGE, RTI R
f = 10Hz 16 ✻ nV/√Hz
f = 100Hz 12 ✻ nV/√Hz
f = 1kHz 12 ✻ nV/√Hz
f = 10kHz 12 ✻ nV/√Hz
f

= 0.1Hz to 10Hz 0.4 ✻ µVp-p

B

Noise Current
f = 10Hz 0.4 ✻ pA/√Hz
f= 1kHz 0.2 ✻ pA/√Hz
f

= 0.1Hz to 100Hz 18 ✻ pAp-p

B

GAIN

Gain Error
Resistor Value

(1)

(2)

Gain vs Temperature ±5 ±10 ✻ ±20 ppm/°C
Nonlinearity ±0.0003 ±0.002 ✻ ±0.004 % of FSR

OUTPUT

Voltage I

Load Capacitance, max Stable Operation 1000 ✻ pF
Short Circuit Current +20/–15 ✻ mA

FREQUENCY RESPONSE

Bandwidth, –3dB 70 ✻ kHz
Slew Rate V
Settling Time, 0.01% 100 ✻ µs
Overload Recovery 50% Overdrive 20 ✻ µs

POWER SUPPLY

Voltage Range ±2.25 ±15 ±18 ✻✻✻ V
Current V

TEMPERATURE RANGE

Specification –40 85 ✻✻°C
Operating –40 125 ✻✻°C

θ

JA

= +25°C ±10 ±50 ±25 ±125 µV

A

= T

to T

A

MIN

S

MAX

= 0Ω

= ±2.25V to ±18V 0.5 3 ✻✻ µV/V

S

= ±10V, ∆RS = 1kΩ 110 120 106 110 dB

CM

±0.1 ±0.25 ±0.25 ±1 µV/°C

10

|| 6 ✻ Ω || pF

10

|| 6 ✻ Ω || pF

±0.01 ±0.024 ✻ ±0.1 %

±10 ±40 ✻✻ %

= 5mA, T

O

V

= ±11.4V, RL = 2kΩ±10 10.5 ✻✻ V

S

V

= ±2.25V, R L= 2kΩ±1 1.5 ✻✻ V

S

to T

MIN

MAX

= ±10V 0.3 0.7 ✻✻ V/µs

O

= 0V ±2.2 ±3 ✻✻ mA

IN

±13.5 ±13.7 ✻✻ V

100 ✻ °C/W

✻ Specification same as INA131BP.
NOTES: (1) R

= 10kΩ. (2) Absolute value of internal gain-setting resistors. (Gain depends on resistor ratios.)

L

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.

®

INA131

2

PIN CONFIGURATION

Top View P-Package/8-Pin DIP

1

R

G

–

2

V

IN

+

3

V

IN

4

V–

8

R

G

7

V+

6

V

O

5

Ref

ABSOLUTE MAXIMUM RATINGS

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

NOTE: (1) Stresses above these ratings may cause permanent damage.

(1)

ELECTROSTATIC

PACKAGE/ORDERING INFORMATION

PACKAGE
DRAWING TEMPERATURE

PRODUCT PACKAGE NUMBER

INA131AP 8-Pin Plastic DIP 006 –40°C to +85°C
INA131BP 8-Pin Plastic DIP 006 –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.

(1)

RANGE

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.

®

3

INA131

TYPICAL PERFORMANCE CURVES

At 25°C, VS = ±15V, unless otherwise noted.

60

40

20

Gain (dB)

0

–20

100 1k 100k 1M 10M10k

INPUT COMMON-MODE VOLTAGE RANGE

15

10

Limited by A

+ Output Swing

5

0

A3 – Output

–5

Common-Mode Voltage (V)

–10

Swing Limit

Limited by A

– Output Swing

–15

–15 –10 0 5 15–5

GAIN vs FREQUENCY

Frequency (Hz)

vs OUTPUT VOLTAGE

1

–

V

D/2

+
–

V

D/2

+

V

CM

2

Limited by A

+ Output Swing

Output Voltage (V)

2

V

O

A3 + Output

Swing Limit

Limited by A

1

– Output Swing

10

140

COMMON-MODE REJECTION vs FREQUENCY

120

100

80

60

40

Common-Mode Rejection (dB)

20

0

10 100 10k 100k 1M1k

POWER SUPPLY REJECTION

vs FREQUENCY

140

120

100

80

60

Positive SupplyPositive SupplyPositive SupplyPositive Supply

40

Power Supply Rejection (dB)

20

0

10 100 10k 1M1k

Frequency (Hz)

Negative Supply

100k

Frequency (Hz)

INPUT- REFERRED NOISE VOLTAGE

100

10

Input-Referred Noise Voltage (nV/√ Hz)

1

110 1k100

®

INA131

vs FREQUENCY

Frequency (Hz)

10k

6

4

2

0

–2

Offset Voltage Change (µV)

–4

–6

0

4

OFFSET VOLTAGE WARM-UP vs TIME

15 30 45 60 75 90 105 120

Time from Power Supply Turn-on (s)