INA141

INA141

Precision, Low Power, G = 10, 100

INSTRUMENTATION AMPLIFIER

FEATURES

LOW OFFSET VOLTAGE: 50

V max

LOW DRIFT: 0.5

C max

ACCURATE GAIN:

0.05% at G = 10

LOW INPUT BIAS CURRENT: 5nA max

HIGH CMR: 117dB min

INPUTS PROTECTED TO

40V

WIDE SUPPLY RANGE:

2.25 to

18V

LOW QUIESCENT CURRENT: 750

8-PIN PLASTIC DIP, SO-8

DESCRIPTION

The INA141 is a low power, general purpose instru-

mentation 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).

Simple pin connections set an accurate gain of 10 or

100V/V without external resistors. Internal input pro-

tection can withstand up to

40V without damage.

The INA141 is laser trimmed for very low offset

voltage (50

V), drift (0.5

C) and high common-

mode rejection (117dB at G = 100). It operates with

power supplies as low as

2.25V, and quiescent

current is only 750

A—ideal for battery operated

systems.

The INA141 is available in 8-pin plastic DIP, and

SO-8 surface-mount packages, specified for the –40

to +85

C temperature range.

INA141

40k

Ω

40k

Ω

40k

Ω

40k

Ω

V+

V–

INA141

Ref

–

Over-Voltage

Protection

25k

Ω

25k

Ω

Over-Voltage

Protection

G = 10

G =100

252

Ω

5050

Ω

252

Ω

APPLICATIONS

BRIDGE AMPLIFIER

THERMOCOUPLE AMPLIFIER

RTD SENSOR AMPLIFIER

MEDICAL INSTRUMENTATION

DATA ACQUISITION

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

PDS-1297B

INA141

SPECIFICATIONS

At T

= +25

C, V

15V, and R

= 10k

Ω,

unless otherwise noted.

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.

INA141P, U

INA141PA, UA

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

INPUT

Offset Voltage, RTI

G = 100

125

G = 10

100

250

vs Temperature

G = 100

0.2

0.5

1.5

G = 10

(2)

0.5

2.5

vs Power Supply

2.25 to

18V, G = 100

0.4

V/V

G = 10

V/V

Long-Term Stability

G = 100

0.2

V/mo

G = 10

0.5

V/mo

Impedance, Differential

|| 2

Ω

|| pF

Common-Mode

|| 9

Ω

|| pF

Common-Mode Voltage Range

(1)

= 0V

(V+) – 2

(V+) – 1.4

(V–)

+ 2

(V–)

+ 1.7

Safe Input Voltage

Common-Mode Rejection

13V,

∆

= 1k

Ω

G = 100

117

125

110

120

G = 10

100

106

100

BIAS CURRENT

vs Temperature

pA/

Offset Current

vs Temperature

pA/

NOISE VOLTAGE, RTI

f = 10Hz

G = 100, R

= 0

Ω

nV/

√

f = 100Hz

nV/

√

f = 1kHz

nV/

√

= 0.1Hz to 10Hz

0.2

Vp-p

f = 10Hz

G = 10, R

= 0

Ω

nV/

√

f = 100Hz

nV/

√

f = 1kHz

nV/

√

= 0.1Hz to 10Hz

0.6

Vp-p

Noise Current

f = 10Hz

0.9

pA/

√

f = 1kHz

0.3

pA/

√

= 0.1Hz to 10Hz

pAp-p

GAIN

Gain Error

13.6V, G = 100

0.03

0.075

0.15

G = 10

0.01

0.05

0.15

Gain vs Temperature

(2)

G = 10, 100

ppm/

Nonlinearity

G = 100

0.0005

0.002

0.004

% of FSR

G = 10

0.0003

0.001

0.002

% of FSR

OUTPUT

Voltage: Positive

= 10k

Ω

(V+) – 1.4

(V+) – 0.9

Negative

= 10k

Ω

(V–) + 1.4

(V–) + 0.9

Load Capacitance Stability

1000

Short-Circuit Current

+6/–15

FREQUENCY RESPONSE

Bandwidth, –3dB

G = 100

200

kHz

G = 10

MHz

Slew Rate

10V, G = 10

Settling Time, 0.01%

5V, G = 100

G = 10

Overload Recovery

50% Overdrive

POWER SUPPLY

Voltage Range

2.25

Current, Total

= 0V

750

800

TEMPERATURE RANGE

Specification

–40

Operating

–40

125

8-Pin DIP

C/W

SO-8 SOIC

150

C/W

Specification same as INA141P, U.

NOTE: (1) Input common-mode range varies with output voltage—see typical curves. (2) Guaranteed by wafer test.

INA141

–

V–

V+

Ref

Top View

PIN CONFIGURATION

8-Pin DIP and SO-8

Supply Voltage ..................................................................................

18V

Analog Input Voltage Range .............................................................

40V

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

Operating Temperature ................................................. –40

C to +125

Storage Temperature ..................................................... –40

C to +125

Junction Temperature .................................................................... +150

Lead Temperature (soldering, 10s) ............................................... +300

ABSOLUTE MAXIMUM RATINGS

ELECTROSTATIC

DISCHARGE SENSITIVITY

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.

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

INA141PA

8-Pin Plastic DIP

006

–40

C to +85

INA141P

8-Pin Plastic DIP

006

–40

C to +85

INA141UA

SO-8 Surface-Mount

182

–40

C to +85

INA141U

SO-8 Surface-Mount

182

–40

C to +85

NOTE: (1) For detailed drawing and dimension table, please see end of data

sheet, or Appendix C of Burr-Brown IC Data Book.

INA141

TYPICAL PERFORMANCE CURVES

At T

= +25

C and V

15V, unless otherwise noted.

GAIN vs FREQUENCY

–10

–20

Gain (dB)

Frequency (Hz)

10k

100k

10M

G = 100V/V

G = 10V/V

POSITIVE POWER SUPPLY REJECTION

vs FREQUENCY

Frequency (Hz)

Power Supply Rejection (dB)

140

120

100

10k

100k

G = 100V/V

G = 10V/V

INPUT COMMON-MODE RANGE

vs OUTPUT VOLTAGE, V

= ±5, ±2.5V

Output Voltage (V)

Common-Mode Voltage (V)

–5

–1

–2

–3

–4

–5

–4

–3

–2

–1

= ±5V

= ±2.5V

COMMON-MODE REJECTION vs FREQUENCY

Frequency (Hz)

Common-Mode Rejection (dB)

100

10k

140

120

100

100k

G = 10V/V

G = 100V/V

NEGATIVE POWER SUPPLY REJECTION

vs FREQUENCY

Frequency (Hz)

Power Supply Rejection (dB)

140

120

100

10k

100k

G = 100V/V

G = 10V/V

INPUT COMMON-MODE RANGE

vs OUTPUT VOLTAGE, V

= ±15V

Output Voltage (V)

Common-Mode Voltage (V)

–15

–10

–5

–10

–15

D/2

–

D/2

Ref

–15V

+15V

INA141

INPUT OFFSET VOLTAGE WARM-UP

–2

–4

–6

–8

–10

100

200

300

400

500

Time (µs)

Input Offset Voltage Change (µV)

TYPICAL PERFORMANCE CURVES

(CONT)

At T

= +25

C and V

15V, unless otherwise noted.

OUTPUT VOLTAGE SWING

vs OUTPUT CURRENT

(V+)

(V+)–0.4

(V+)–0.8

(V+)–1.2

(V+)+1.2

(V–)+0.8

(V–)+0.4

V–

Output Current (mA)

Output Voltage (V)

INPUT- REFERRED NOISE vs FREQUENCY

Frequency (Hz)

Input-Referred Voltage Noise (nV/

√

Hz)

100

10k

G = 10V/V

100

0.1

Input Bias Current Noise (pA/

√

Hz)

Current Noise

G = 100V/V

INPUT OVER-VOLTAGE V/I CHARACTERISTICS

–1

–2

–3

–4

–5

Input Current (mA)

Input Voltage (V)

–50

–40

–30

–20

–10

G = 10V/V

G = 100V/V

–15V

+15V

INA141

Flat region represents

normal linear operation.

QUIESCENT CURRENT and SLEW RATE

vs TEMPERATURE

Temperature (°C)

Quiescent Current (µA)

0.9

0.85

0.8

0.75

0.7

0.65

–75

–50

–25

100

125

Slew Rate (V/µs)

Slew Rate

INPUT BIAS CURRENT vs TEMPERATURE

–1

–2

–75

–50

–25

100

125

Temperature (°C)

Input Bias Current (nA)

Typical I

Range

±2nA at 25°C

INA141

TYPICAL PERFORMANCE CURVES

(CONT)

At T

= +25

C and V

15V, unless otherwise noted.

OUTPUT VOLTAGE SWING

vs POWER SUPPLY VOLTAGE

V+

(V+)–0.4

(V+)–0.8

(V+)–1.2

(V–)+1.2

(V–)+0.8

(V–)+0.4

V–

Power Supply Voltage (V)

Output Voltage Swing (V)

+25°C +85°C

–40°C

+25°C

–40°C

+85°C

= 10k

Ω

+85°C

–40°C

SHORT-CIRCUIT OUTPUT CURRENT

vs TEMPERATURE

–75

–50

–25

100

125

Temperature (°C)

Short-Circuit Current (mA)

–I

MAXIMUM OUTPUT VOLTAGE vs FREQUENCY

Frequency (Hz)

Peak-to-Peak Output Voltage (Vpp)

10k

100k

G = 10, 100

TOTAL HARMONIC DISTORTION + NOISE

vs FREQUENCY

Frequency (Hz)

THD+N (%)

100

10k

0.1

0.01

0.001

100k

= 1Vrms

G = 10V/V

= 100k

Ω

G = 100, R

= 100k

Ω

= 10k

Ω

500kHz Measurement

Bandwidth

Dashed Portion

is noise limited.

INA141

APPLICATION INFORMATION

Figure 1 shows the basic connections required for operation

of the INA141. Applications with noisy or high impedance

power supplies may require decoupling capacitors close to

the device pins as shown.

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 8

Ω

in series with the Ref pin will cause a typical

device to degrade to approximately 80dB CMR (G = 1).

SETTING THE GAIN

Gain is selected with a jumper connection as shown in

Figure 1. G = 10V/V with no jumper installed. With a

jumper installed, G = 100V/V. To preserve good gain

accuracy, this jumper must have low series resistance. A

resistance of 0.5

Ω

in series with the jumper will decrease the

gain by 0.1%.

Internal resistor ratios are laser trimmed to assure excellent

gain accuracy. Actual resistor values can vary by approxi-

mately

25% from the nominal values shown.

Gains between 10 and 100 can be achieved by connecting an

external resistor to the jumper pins. This is not recom-

mended, however, because the

25% variation of internal

resistor values makes the required external resistor value

uncertain. A companion model, INA128, features accurately

trimmed internal resistors so that gains from 1 to 10,000 can

be set with an external resistor.

DYNAMIC PERFORMANCE

The typical performance curve “Gain vs Frequency” shows