LT1124/LT1125

20

11245ff

For more information www.linear.com/LT1124

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LINEAR TECHNOLOGY CORPORATION 1992

LT 0114 REV F • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

relaTeD parTs

Typical applicaTion

PART NUMBER

DESCRIPTION

COMMENTS

LT1007

Single Low Noise, Precision Op Amp

2.5nV/√Hz 1kHz Voltage Noise

LT1028/LT1128

Single Low Noise, Precision Op Amps

0.85nV/√Hz Voltage Noise

LT1112/LT1114

Dual/Quad Precision Picoamp Input

LT1113

Dual Low Noise JFET Op Amp

4.5nV/√Hz Voltage Noise, 10fA/√Hz Current Noise

LT1126/LT1127

Decompensated LT1124/LT1125

11V/µs Slew Rate

LT1169

Dual Low Noise JFET Op Amp

LT1792

Single LT1113

4.2nV/√Hz Voltage Noise, 10fA/√Hz Current Noise

LT1793

Single LT1169

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

BRIDGE

1µF

301k*

0V TO 10V

OUTPUT

499*

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 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

Strain Gauge Signal Conditioner with Bridge Excitation