Burr Brown INA2128UA-1K, INA2128UA, INA2128U-1K, INA2128U Datasheet

©

1994 Burr-Brown Corporation PDS-1243C Printed in U.S.A. January, 1996

FEATURES

● LOW OFFSET VOLTAGE: 50µV max

● LOW DRIFT: 0.5

µV/°C max

● LOW INPUT BIAS CURRENT: 5nA max

● HIGH CMR: 120dB min

● INPUTS PROTECTED TO

±40V

● WIDE SUPPLY RANGE:

±2.25V to ±18V

● LOW QUIESCENT CURRENT: 700

µA / IA

● 16-PIN PLASTIC DIP, SOL-16

DESCRIPTION

The INA2128 is a dual, low power, general purpose
instrumentation 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 common­mode 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 16-pin plastic DIP, and
SOL-16 surface-mount packages, specified for the
–40°C to +85°C temperature range.

APPLICATIONS

● SENSOR AMPLIFIER

THERMOCOUPLE, RTD, BRIDGE

● MEDICAL INSTRUMENTATION

● MULTIPLE-CHANNEL SYSTEMS

● BATTERY OPERATED EQUIPMENT

Dual, Low Power

INSTRUMENTATION AMPLIFIER

INA2128

A

1A

A

2A

A

3A

40kΩ40kΩ

40kΩ40kΩ

V

INA

1

3

4

2

16

14

13

15

7

6

5

10

11

12

V

INA

R

GA

V+

V–

INA2128

Ref

A

V

OA

GA = 1 +

50kΩ

R

GA

–

+

Over-Voltage

Protection

25kΩ

25kΩ

Over-Voltage

Protection

A

1B

A

2B

A

3B

40kΩ40kΩ

8

9

40kΩ40kΩ

V

INB

V

INB

R

GB

Ref

B

V

OB

GB = 1 +

50kΩ

R

GB

–

+

Over-Voltage

Protection

25kΩ

25kΩ

Over-Voltage

Protection

®

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

INA2128

INA2128

®

INA2128

2

SPECIFICATIONS

At TA = +25°C, VS = ±15V, RL = 10kΩ, unless otherwise noted.

INA2128P, U INA2128PA, UA
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
INPUT

Offset Voltage, RTI

Initial T

A

= +25°C ±10 ±100/G ±50 ±500/G ±25 ±100/G ±125 ±1000/G µV

vs Temperature T

A

= T

MIN

to T

MAX

±0.2 ± 2/G ±0.5 ± 20/G ±0.2 ± 5/G ±1 ± 20/G µV/°C

vs Power Supply V

S

= ±2.25V to ±18V ±0.2 ±20/G ±1 ±100/G ✻ ±2 ±200/G µV/V

Long-Term Stability ±0.1 ±3/G ✻ µV/mo

Impedance, Differential 10

10

|| 2 ✻ Ω || pF

Common-Mode 10

11

|| 9 ✻ Ω || pF

Common-Mode Voltage Range

(1)

VO = 0V (V+) – 2 (V+) – 1.4 ✻✻ V

(V–)

+ 2 (V–) + 1.7 ✻✻ V
Safe Input Voltage ±40 ✻ V
Common-Mode Rejection V

CM

= ±13V, ∆RS = 1kΩ

G=1 80 86 73 ✻ dB

G=10 100 106 93 ✻ dB

G=100 120 125 110 ✻ dB

G=1000 120 130 110 ✻ dB

BIAS CURRENT ±2 ±5 ✻ ±10 nA

vs Temperature ±30 ✻ pA/°C

Offset Current ±1 ±5 ✻ ±10 nA

vs Temperature ±30 ✻ pA/°C

NOISE VOLTAGE, RTI G = 1000, R

S

= 0Ω
f = 10Hz 10 ✻ nV/√Hz
f = 100Hz 8 ✻ nV/√Hz
f = 1kHz 8 ✻ nV/√Hz
f

B

= 0.1Hz to 10Hz 0.2 ✻ µVp-p

Noise Current

f=10Hz 0.9 ✻ pA/√Hz
f=1kHz 0.3 ✻ pA/√Hz
f

B

= 0.1Hz to 10Hz 30 ✻ pAp-p

GAIN

Gain Equation 1 + (50kΩ/R

G

) ✻ V/V
Range of Gain 1 10000 ✻✻V/V
Gain Error G=1 ±0.01 ±0.024 ✻ ±0.1 %

G=10 ±0.02 ±0.4 ✻ ±0.5 %

G=100 ±0.05 ±0.5 ✻ ±0.7 %

G=1000 ±0.5 ±1 ✻ ±2%

Gain vs Temperature

(2)

G=1 ±1 ±10 ✻✻ppm/°C

50kΩ Resistance

(2, 3)

±25 ±100 ✻✻ppm/°C

Nonlinearity V

O

= ±13.6V, G=1 ±0.0001 ±0.001 ✻ ±0.002 % of FSR

G=10 ±0.0003 ±0.002 ✻ ±0.004 % of FSR
G=100 ±0.0005 ±0.002 ✻ ±0.004 % of FSR

G=1000 ±0.001 (Note 4) ✻✻% of FSR

OUTPUT

Voltage: Positive R

L

= 10kΩ (V+) – 1.4 (V+) – 0.9 ✻✻ V

Negative R

L

= 10kΩ (V–) + 1.4 (V–) + 0.8 ✻✻ V
Load Capacitance Stability 1000 ✻ pF
Short-Circuit Current +6/–15 ✻ mA

FREQUENCY RESPONSE

Bandwidth, –3dB G=1 1.3 ✻ MHz

G=10 700 ✻ kHz

G=100 200 ✻ kHz

G=1000 20 ✻ kHz

Slew Rate V

O

= ±10V, G=10 4 ✻ V/µs

Settling Time, 0.01% G=1 7 ✻ µs

G=10 7 ✻ µs

G=100 9 ✻ µs

G=1000 80 ✻ µs

Overload Recovery 50% Overdrive 4 ✻ µs

POWER SUPPLY

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

IN

= 0V ±1.4 ±1.5 ✻✻mA

TEMPERATURE RANGE

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

θ

JA

80 ✻ °C/W

✻ Specification same as INA2128P, U.
NOTE: (1) Input common-mode range varies with output voltage—see typical curves. (2) Guaranteed by wafer test. (3) Temperature coefficient of the “50kΩ” term in

the gain equation. (4) Nonlinearity measurements in G = 1000 are dominated by noise. Typical nonlinearity is ±0.001%.

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.

®

INA2128

3

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

PIN CONFIGURATION

Top View DIP

SOL-16

V

INA

V

INA

R

GA

R

GA

V

INB

V

INB

R

GB

R

GB

1
2
3
4

Ref

A

V

OA

Sense

A

V–

5
6
7
8

16
15
14
13

Ref

B

V

OB

Sense

B

V+

12
11
10

9

–

+

–

+

ELECTROSTATIC
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.

ORDERING INFORMATION

PACKAGE
DRAWING TEMPERATURE

PRODUCT PACKAGE NUMBER

(1)

RANGE

INA2128PA 16-Pin Plastic DIP 180 –40°C to +85°C
INA2128P 16-Pin Plastic DIP 180 –40°C to +85°C
INA2128UA SOL-16 Surface-Mount 211 –40°C to +85°C
INA2128U SOL-16 Surface-Mount 211 –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.