®

INA103

1

Low Noise, Low Distortion

INSTRUMENTATION AMPLIFIER

FEATURES

q LOW NOISE: 1nV/

√Hz

q LOW THD+N: 0.0009% at 1kHz, G = 100

q HIGH GBW: 100MHz at G = 1000

q WIDE SUPPLY RANGE:

q HIGH CMRR: >100dB

q BUILT-IN GAIN SETTING RESISTORS:

G = 1, 100

q UPGRADES AD625

APPLICATIONS

q HIGH QUALITY MICROPHONE PREAMPS

(REPLACES TRANSFORMERS)

q MOVING-COIL PREAMPLIFIERS

q DIFFERENTIAL RECEIVERS

q AMPLIFICATION OF SIGNALS FROM:

Strain Gages (Weigh Scale Applications)

Thermocouples

Bridge Transducers

DESCRIPTION

The INA103 is a very low noise, low distortion mono-

lithic instrumentation amplifier. Its current-feedback

circuitry achieves very wide bandwidth and excellent

dynamic response. It is ideal for low-level audio

signals such as balanced low-impedance microphones.

The INA103 provides near-theoretical limit noise per-

formance for 200

Ω source impedances. Many indus-

trial applications also benefit from its low noise and

wide bandwidth.

Unique distortion cancellation circuitry reduces dis-

tortion to extremely low levels, even in high gain. Its

balanced input, low noise and low distortion provide

superior performance compared to transformer-coupled

microphone amplifiers used in professional audio

equipment.

The INA103’s wide supply voltage (

±9 to ±25V) and

high output current drive allow its use in high-level

audio stages as well. A copper lead frame in the plastic

DIP assures excellent thermal performance.

The INA103 is available in 16-pin plastic DIP and

SOL-16 surface-mount packages. Commercial and In-

dustrial temperature range models are available.

–Input

+Input

+Gain Sense

3k

Ω

60.6

Ω

G = 100

–R

–Gain Drive

+Gain Drive

Ref

Sense

Output

6k

Ω

6k

Ω

6k

Ω

3k

Ω

G

+

–

–

+

–

+

+R

G

16

15

2

1

6

13

14

12

5

7

11

10

V–

9

8

V+

3

4

Offset

Null

Offset

Null

–Gain Sense

A

1

A

2

A

3

6k

Ω

®

INA103

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

INA103

INA103

PDS-1016H

Printed in U.S.A. March, 1998

SBOS003