TEXAS INSTRUMENTS INA145 Technical data

®

For most current data sheet and other product

information, visit www.burr-brown.com

Programmable Gain

DIFFERENCE AMPLIFIER

INA145

INA145

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

= ±15V

S

● LOW GAIN ERROR: 0.01%

● HIGH CMR: 86dB

● SO-8 PACKAGE

APPLICATIONS

● CURRENT SHUNT MEASUREMENTS

● SENSOR AMPLIFIER

●

DIFFERENTIAL LINE RECEIVER

● BATTERY POWERED SYSTEMS

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.

SBOS120

R

G1

V+

R

10kΩ

(1%)

R

5

1

7

R

1

40kΩ

2

–

V

IN

G = 1

R

3

40kΩ

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

R

2

40kΩ

A1

R

4

40kΩ

418

RefV–

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

R

G2

G

5

A2

INA145

V

01

V

6

O

+–

V

= (VIN – VIN)(1 + RG2/RG1)

O

INA145

®

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.

INA145UA
PARAMETER CONDITION MIN TYP MAX UNITS
OFFSET VOLTAGE, V

Input Offset Voltage V

vs Temperature ∆V

vs Power Supply PSRR V

O

OS

/∆T See Typical Curve

OS

vs Time ±0.3 µV/mo
Offset Voltage, V

01

INPUT VOLTAGE RANGE

Common-Mode Voltage Range V
Common-Mode Rejection CMRR V

CM

Over Temperature V

INPUT BIAS CURRENT

Bias Current I
Offset Current I

(2)

B

OS

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

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

CM

INPUT IMPEDANCE

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

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

n

GAIN

Gain Equation G = 1 + RG2/R

(1)

Initial
Gain Error R

vs Temperature R

vs Temperature R

Nonlinearity R

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

L

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

L

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

R

L

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

L

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

L

FREQUENCY RESPONSE

Small Signal Bandwidth G = 1 500 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

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

O

Over Temperature R

Over Temperature R

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

Over Temperature

TEMPERATURE RANGE

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

θ

JA

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.

(1, 2)

RTI

V

= VO = 0V ±0.2 ±1mV

CM

= ±1.35V to ±18V ±20 ±60 µV/V

S

(1, 2)

RTI

= ±15V 70 80 dB

S

±0.4 mV

VCM = VS/2

±50 nA

±5nA

(1, 3)

90 nV/√Hz

G = 1 to 1000

G1

1V/V

V/V

G = 10 50 kHz

= 100kΩ, G = 1 (V–) + 0.25 (V+) – 1 V

L

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

R

L

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

L

= 0, IO = 0 ±570 ±700 µA

IN

±800 µA

150 °C/W

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.

®

INA145

2

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.

INA145UA
PARAMETER CONDITION MIN TYP MAX UNITS
OFFSET VOLTAGE, V

Input Offset Voltage V

vs Temperature ∆V

vs Power Supply Rejection Ratio PSRR V

O

OS

/∆T See Typical Curve

OS

vs Time ±0.3 µV/mo
Offset Voltage, V

INPUT VOLTAGE RANGE

Common-Mode Voltage Range
Common-Mode Rejection Ratio CMRR V

Over Temperature 80 dB

INPUT BIAS CURRENT

Bias Current I
Offset Current I

01

(3)

(2)

V

CM

B

OS

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

= –2.5V to +5.5V, RS = 0Ω 76 86 dB

CM

INPUT IMPEDANCE

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

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

n

GAIN

Gain Equation G = 1 + R

(1)

Initial
Gain Error R

vs Temperature R

vs Temperature R

Nonlinearity R

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

L

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

L

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

R

L

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

L

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

L

FREQUENCY RESPONSE

Small Signal Bandwidth G = 0.1 500 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

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

O

Over Temperature R

Over Temperature R

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

Over Temperature 800 µA

TEMPERATURE RANGE

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

NOTES: (1) Referred to input pins (V
amplifier’s input bias and offset currents. (3) Common-mode voltage range with single supply is 2(V+) – 2V – V

θ

JA

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

IN

noise and thermal noise contribution of resistor network.

(1, 2)

RTI

V

= VO = 2.5V ±0.35 ±1mV

CM

= ±1.35V to ±18V ±20 ±60 µV/°C

S

(1, 2)

RTI

±0.55 mV

±50 nA

±5nA

(1, 4)

90 nV/√Hz

G = 1 to 1000

G2/RG1

1V/V

G = 1 50 kHz

= 100kΩ, G = 1 0.25 4 V

L

= 10kΩ, G = 1 0.3 3.75 V

R

L

= 10kΩ, G = 1 0.5 3.75 V

L

= 0, IO = 0 550 700 µA

IN

150 °C/W

to –V

REF

. (4) Includes effects of input current

REF

V/V
V/V

®

3

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.

INA145UA
PARAMETER CONDITION MIN TYP MAX UNITS
OFFSET VOLTAGE, V

Input Offset Voltage V

vs Temperature ∆V

INPUT VOLTAGE RANGE

Common-Mode Voltage Range V
Common-Mode Rejection Ratio CMRR V

OPEN-LOOP GAIN

Open Loop Gain A

INPUT BIAS CURRENT

Bias Current I
Offset Current I

RESISTOR AT A1 OUTPUT, V

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

O

(2)

O1

OS

/∆T ±1 µV/°C

OS

CM

OL

B

OS

VS = ±15V, V

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

(1, 2)

RTI

= VO = 0V ±0.5 mV

CM

= (V–) to (V+) –1 90 dB

CM

110 dB

±50 nA

±5nA

PIN CONFIGURATION

Top View SO-8

1

Ref

–

2

V

IN
+

3

V

IN

4

V–

ABSOLUTE MAXIMUM RATINGS

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

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

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.

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

8

V

O1

7

V+

6

V

O

5

R

G

(1)

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.

PACKAGE/ORDERING INFORMATION

PACKAGE SPECIFIED

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

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

DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

"""""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.

®

INA145

4

(1)

MEDIA

TYPICAL PERFORMANCE CURVES

GAIN vs FREQUENCY

Frequency (Hz)

Voltage Gain (dB)

100 1K 10K 1M 10M

60

40

20

0

–20

100K

G = 100

G = 10

G = 1

VS = ±15V

C

L

= 200pF 10kΩ

At TA = +25°C, VS = ±15V, G = 1, RL = 10kΩ connected to ground and Ref pin connected to ground, unless otherwise noted.

60

40

20

Voltage Gain (dB)

0

–20

100 1K 10K 1M 10M

100

80

60

COMMON-MODE REJECTION vs FREQUENCY

GAIN vs FREQUENCY

G = 100

G = 10

G = 1

100K

Frequency (Hz)

VS = ±15V

C

= 1000pF

L

100

POWER SUPPLY REJECTION vs FREQUENCY

PSR+

= ±15V)

(V

80

60

S

PSR+

= +5V)

(V

S

40

20

Common-Mode Rejection (dB)

0

10 100 1k 1M 10M

1k

100

Input Voltage Noise (nV/√Hz

10

0.1 1 10 10k 100k

INPUT VOLTAGE NOISE DENSITY

10k 100k

Frequency (Hz)

G = 1

G = 100

G = 10

100 1k

Frequency (Hz)

40

20

Power Supply Rejection (dB)

0

1 10 100 10k 100k

0.1Hz to 10Hz VOLTAGE NOISE (RTI)

500nV/div

PSR–

= ±15V)

(V

S

1k

Frequency (Hz)

500ms/div

®

5

INA145