Burr Brown INA145UA-2K5, INA145UA Datasheet

1

®

INA145

®

INA145

©1999 Burr-Brown Corporation PDS-1567B Printed in U.S.A. March, 2000

Programmable Gain

DIFFERENCE AMPLIFIER

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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

For most current data sheet and other product

information, visit www.burr-brown.com

DESCRIPTION

The INA145 is a precision, unity-gain difference
amplifier consisting of a precision op amp and on­chip precision resistor network. Two external resistors
set the gain from 1V/V to 1000V/V. The input com­mon-mode voltage range extends beyond the positive
and negative rails.

On-chip precision resistors are laser-trimmed to achieve
accurate gain and high common-mode rejection. Ex­cellent TCR tracking of these resistors assures contin­ued high precision over temperature.

The INA145 is available in the SO-8 surface-mount
package specified for the extended industrial tempera­ture range, –40°C to +85°C.

FEATURES

● DIFFERENTIAL GAIN = 1V/V TO 1000V/V:

Set with External Resistors

● LOW QUIESCENT CURRENT: 570µA

● WIDE SUPPLY RANGE:

Single Supply: 4.5V to 36V
Dual Supplies: ±2.25V to ±18V

● HIGH COMMON-MODE VOLTAGE:

+8V at VS = +5V

±28V at V

S

= ±15V

● LOW GAIN ERROR: 0.01%

● HIGH CMR: 86dB

● SO-8 PACKAGE

APPLICATIONS

● CURRENT SHUNT MEASUREMENTS

● SENSOR AMPLIFIER

●

DIFFERENTIAL LINE RECEIVER

● BATTERY POWERED SYSTEMS

INA145

R

5

10kΩ

(1%)

A1

V

IN

INA145

V

O

R

2

40kΩ

R

1

40kΩ

V

IN

R

3

40kΩ

R

4

40kΩ

R

G1

R

G

R

G2

A2

V

01

RefV–

V+

G = 1

+

–

2

5

7

418

6

3

V

O

= (VIN – VIN)(1 + RG2/RG1)

+–

2

®

INA145

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.

INA145UA
PARAMETER CONDITION MIN TYP MAX UNITS
OFFSET VOLTAGE, V

O

RTI

(1, 2)

Input Offset Voltage V

OS

V

CM

= VO = 0V ±0.2 ±1mV

vs Temperature ∆V

OS

/∆T See Typical Curve

vs Power Supply PSRR V

S

= ±1.35V to ±18V ±20 ±60 µV/V
vs Time ±0.3 µV/mo
Offset Voltage, V

01

RTI

(1, 2)

±0.4 mV

INPUT VOLTAGE RANGE

Common-Mode Voltage Range V

CM

(VIN+) – (VIN–) = 0V, VO = 0V 2(V–) 2(V+) –2 V

Common-Mode Rejection CMRR V

CM

= 2(V–) to 2(V+) – 2V, RS = 0Ω 76 86 dB

Over Temperature V

S

= ±15V 70 80 dB

INPUT BIAS CURRENT

(2)

VCM = VS/2

Bias Current I

B

±50 nA

Offset Current I

OS

±5nA

INPUT IMPEDANCE

Differential (non-inverting input) 80 kΩ
Differential (inverting input) 27 kΩ
Common-Mode 40 kΩ

NOISE RTI

(1, 3)

Voltage Noise, f = 0.1Hz to 10Hz 2 µVp-p
Voltage Noise Density, f = 1kHz e

n

90 nV/√Hz

GAIN

G = 1 to 1000

Gain Equation G = 1 + RG2/R

G1

V/V

Initial

(1)

1V/V

Gain Error R

L

= 100kΩ, VO = (V–)+0.15 to (V+)–1, G = 1 ±0.01 ±0.1 %

vs Temperature R

L

= 100kΩ, VO = (V–)+0.25 to (V+)–1, G = 1 ±2 ±10 ppm/°C

R

L

= 10kΩ, VO = (V–)+0.3 to (V+)–1.25, G = 1 ±0.01 ±0.1 %

vs Temperature R

L

= 10kΩ, VO = (V–)+0.5 to (V+)–1.25, G = 1 ±2 ±10 ppm/°C

Nonlinearity R

L

= 10kΩ, VO = (V–)+0.3 to (V+)–1.25, G = 1 ±0.0002 ±0.005 % of FS

FREQUENCY RESPONSE

Small Signal Bandwidth G = 1 500 kHz

G = 10 50 kHz
Slew Rate 0.45 V/µs
Settling Time, 0.1% G = 1, 10V Step 40 µs

0.01% G = 1, 10V Step 90 µs

Overload Recovery 50% Input Overload 40 µs

OUTPUT, V

O

Voltage Output RL = 100kΩ, G = 1 (V–) + 0.15 (V+) – 1 V

Over Temperature R

L

= 100kΩ, G = 1 (V–) + 0.25 (V+) – 1 V

R

L

= 10kΩ, G = 1 (V–) + 0.3 (V+) – 1.25 V

Over Temperature R

L

= 10kΩ, G = 1 (V–) + 0.5 (V+) – 1.25 V

Short-Circuit Current Continuous to Common ±15 mA
Capacitive Load Stable Operation 1000 pF

POWER SUPPLY

Specified Voltage Range, Dual Supplies ±2.25 ±18 V
Operating Voltage Range ±1.35 ±18 V
Quiescent Current V

IN

= 0, IO = 0 ±570 ±700 µA

Over Temperature

±800 µA

TEMPERATURE RANGE

Specified Range –40 +85 °C
Operating Range –55 +125 °C
Storage Range –55 +125 °C
Thermal Resistance

θ

JA

150 °C/W

NOTES: (1) Referred to input pins (VIN+ and VIN–), Gain = 1V/V. Specified with 10kΩ in feedback of A2. (2) Input offset voltage specification includes effects of amplifier’s
input bias and offset currents. (3) Includes effects of input bias current noise and thermal noise contribution of resistor network.

SPECIFICATIONS: VS = ±2.25V to ±18V

Boldface limits apply over the specified temperature range, TA = –40°C to +85°C

At TA = +25°C, G = 1, RL = 10kΩ connected to ground and ref pin connected to ground unless otherwise noted.

3

®

INA145

INA145UA
PARAMETER CONDITION MIN TYP MAX UNITS
OFFSET VOLTAGE, V

O

RTI

(1, 2)

Input Offset Voltage V

OS

V

CM

= VO = 2.5V ±0.35 ±1mV

vs Temperature ∆V

OS

/∆T See Typical Curve

vs Power Supply Rejection Ratio PSRR V

S

= ±1.35V to ±18V ±20 ±60 µV/°C
vs Time ±0.3 µV/mo
Offset Voltage, V

01

RTI

(1, 2)

±0.55 mV

INPUT VOLTAGE RANGE

Common-Mode Voltage Range

(3)

V

CM

VIN+ – VIN– = 0V, VO = 2.5V –2.5 5.5 V

Common-Mode Rejection Ratio CMRR V

CM

= –2.5V to +5.5V, RS = 0Ω 76 86 dB

Over Temperature 80 dB

INPUT BIAS CURRENT

(2)

Bias Current I

B

±50 nA

Offset Current I

OS

±5nA

INPUT IMPEDANCE

Differential (non-inverting input) 80 kΩ
Differential (inverting input) 27 kΩ
Common-Mode 40 kΩ

NOISE RTI

(1, 4)

Voltage Noise, f = 0.1Hz to 10Hz 2 µVp-p
Voltage Noise Density, f = 1kHz e

n

90 nV/√Hz

GAIN

G = 1 to 1000

V/V

Gain Equation G = 1 + R

G2/RG1

V/V

Initial

(1)

1V/V

Gain Error R

L

= 100kΩ, VO = 0.15V to 4V, G = 1 ±0.01 ±0.1 %

vs Temperature R

L

= 100kΩ, VO = 0.25V to 4V, G = 1 ±2 ±10 ppm/°C

R

L

= 10kΩ, VO = 0.3V to 3.75V, G = 1 ±0.01 ±0.1 %

vs Temperature R

L

= 10kΩ, VO = 0.5V to 3.75V, G = 1 ±2 ±10 ppm/°C

Nonlinearity R

L

= 10kΩ, VO = +0.3 to +3.75, G = 1 ±0.001 ±0.005 % of FS

FREQUENCY RESPONSE

Small Signal Bandwidth G = 0.1 500 kHz

G = 1 50 kHz
Slew Rate 0.45 V/µs
Settling Time, 0.1% G = 1, 10V Step 40 µs

0.01% G = 1, 10V Step 90 µs

Overload Recovery 50% Input Overload 40 µs

OUTPUT, V

O

Voltage Output RL = 100kΩ, G = 1 0.15 4 V

Over Temperature R

L

= 100kΩ, G = 1 0.25 4 V

R

L

= 10kΩ, G = 1 0.3 3.75 V

Over Temperature R

L

= 10kΩ, G = 1 0.5 3.75 V

Short-Circuit Current Continuous to Common ±15 mA
Capacitive Load Stable Operation 1000 pF

POWER SUPPLY

Specified Voltage Range, Single Supply +4.5 +36 V
Operating Voltage Range +2.7 +36 V
Quiescent Current V

IN

= 0, IO = 0 550 700 µA

Over Temperature 800 µA

TEMPERATURE RANGE

Specified Range –40 +85 °C
Operating Range –55 +125 °C
Storage Range –55 +125 °C
Thermal Resistance

θ

JA

150 °C/W

NOTES: (1) Referred to input pins (V

IN

+ and VIN–), Gain = 1V/V. Specified with 10kΩ in feedback of A2. (2) Input offset voltage specification includes effects of

amplifier’s input bias and offset currents. (3) Common-mode voltage range with single supply is 2(V+) – 2V – V

REF

to –V

REF

. (4) Includes effects of input current

noise and thermal noise contribution of resistor network.

SPECIFICATIONS: VS = +5V Single Supply

Boldface limits apply over the specified temperature range, TA = –40°C to +85°C

At TA = +25°C, G = 1, RL = 10kΩ connected to ground and ref pin connected to 2.5V unless otherwise noted.

4

®

INA145

AMPLIFIER A1, A2 PERFORMANCE

Boldface limits apply over the specified temperature range, TA = –40°C to +85°C

At TA = +25°C, G = 1, RL = 10kΩ connected to ground and ref pin connected to ground unless otherwise noted.

PIN CONFIGURATION

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.

Supply Voltage, V+ to V– .................................................................... 36V

Signal Input Terminals, Voltage ........................................................±80V

Current .......................................................±1mA

Output Short Circuit (to ground) .............................................. Continuous

Operating Temperature .................................................. –55 °C to +125°C

Storage Temperature ..................................................... –55 °C to +150°C

Junction Temperature .................................................................... +150°C

Lead Temperature (soldering, 10s) ............................................... +240°C

NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.

ABSOLUTE MAXIMUM RATINGS

(1)

Top View SO-8

PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

(1)

MEDIA

INA145UA SO-8 182 –40°C to +85°C INA145UA INA145UA Rails

"""""INA145UA/2K5 Tape and Reel

NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces
of “INA145UA/2K5” will get a single 2500-piece Tape and Reel.

PACKAGE/ORDERING INFORMATION

INA145UA
PARAMETER CONDITION MIN TYP MAX UNITS
OFFSET VOLTAGE, V

O

RTI

(1, 2)

Input Offset Voltage V

OS

VS = ±15V, V

CM

= VO = 0V ±0.5 mV

vs Temperature ∆V

OS

/∆T ±1 µV/°C

INPUT VOLTAGE RANGE

Common-Mode Voltage Range V

CM

VIN+ – VIN– = 0V, VO = 0V (V–) to (V+) –1 V

Common-Mode Rejection Ratio CMRR V

CM

= (V–) to (V+) –1 90 dB

OPEN-LOOP GAIN

Open Loop Gain A

OL

110 dB

INPUT BIAS CURRENT

(2)

Bias Current I

B

±50 nA

Offset Current I

OS

±5nA

RESISTOR AT A1 OUTPUT, V

O1

Initial 10 kΩ
Error ±0.2 %
Temperature Drift Coefficient ±50 ppm/°C

Ref

V

IN

V

IN

V–

–

+

V

O1

V+
V

O

R

G

1
2
3
4

8
7
6
5