16

LT1124/LT1125

©LINEAR TECHNOLOGY CORPORATION 1992

11245fas, sn11245 LT/TP 0699 REV A 2K • PRINTED IN USA

Strain Gauge Signal Conditioner with Bridge Excitation

1124/25 TA05

–

+

–

+

–

+

LT1009

3

2

2.5V

5k

1/4

LT1125

1k

–15V

15V

1

REFERENCE

OUTPUT

15V

–15V

7

4

13

6

5

10k

ZERO

TRIM

301k*

350

Ω

BRIDGE

1

µF

301k*

0V TO 10V

OUTPUT

499

Ω*

GAIN

TRIM

50k

*RN60C FILM RESISTORS

1k

14

–15V

15V

13

12

THE LT1124/LT1125 IS CAPABLE OF PROVIDING EXCITATION CURRENT DIRECTLY

TO BIAS THE 350

Ω BRIDGE AT 5V WITH ONLY 5V ACROSS THE BRIDGE (AS OPPOSED

TO THE USUAL 10V) TOTAL POWER DISSIPATION AND BRIDGE WARM-UP DRIFT IS

REDUCED. THE BRIDGE OUTPUT SIGNAL IS HALVED, BUT THE LT1124/LT1125 CAN

AMPLIFY THE REDUCED SIGNAL ACCURATELY.

1/4

LT1125

1/4

LT1125

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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