©1992 Burr-Brown Corporation

PDS-1169B

Printed in U.S.A. October, 1993

INA115

Precision

INSTRUMENTATION AMPLIFIER

A

1

A

2

A

3

12

11

10

25k

Ω

25k

Ω

25k

Ω

25k

Ω

13

7

5

4

V

IN

V

IN

R

G

V+

V–

INA115

Ref

V

O

G = 1 +

50k

Ω

R

G

–

+

Over-Voltage

Protection

25k

Ω

25k

Ω

Over-Voltage

Protection

Feedback

15

14

3

2

8

V

O2

V

O1

1

FEATURES

q LOW OFFSET VOLTAGE: 50

µV max

q LOW DRIFT: 0.25

µV/

°C max

q LOW INPUT BIAS CURRENT: 2nA max

q HIGH COMMON-MODE REJECTION:

115dB min

q INPUT OVER-VOLTAGE PROTECTION:

±40V

q WIDE SUPPLY RANGE:

±2.25 TO ±18V

q LOW QUIESCENT CURRENT: 3mA max

q SOL-16 SURFACE-MOUNT PACKAGE

APPLICATIONS

q SWITCHED-GAIN AMPLIFIER

q BRIDGE AMPLIFIER

q THERMOCOUPLE AMPLIFIER

q RTD SENSOR AMPLIFIER

q MEDICAL INSTRUMENTATION

q DATA ACQUISITION

DESCRIPTION

The INA115 is a low cost, general purpose instrumen-

tation amplifier offering excellent accuracy. Its versa-

tile three-op amp design and small size make it ideal

for a wide range of applications. Similar to the model

INA114, the INA115 provides additional connections

to the input op amps, A

1 and A2, which improve gain

accuracy in high gains and are useful in forming

switched-gain amplifiers.

A single external resistor sets any gain from 1 to

10,000. Internal input protection can withstand up to

±40V without damage.

The INA115 is laser trimmed for very low offset

voltage (50

µV), drift (0.25µV/˚C) and high common-

mode rejection (115dB at G=1000). It operates with

power supplies as low as

±2.25V, allowing use in

battery operated and single 5V supply systems. Quies-

cent current is 3mA maximum.

The INA115 is available in the SOL-16 surface-mount

package, specified for the –40

°C to +85°C tempera-

ture range.

®

INA115

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

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