11

Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications

at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by

Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any

infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any

patent or patent rights of Intersil or its subsidiaries.

FN6200.3

November 3, 2009

For additional products, see www.intersil.com/product_tree

Strain Gauge

The strain gauge is an ideal application to take

advantage of the moderate bandwidth and high

accuracy of the ISL55001. The operation of the circuit

is very straightforward. As the strain variable

component resistor in the balanced bridge is subjected

to increasing strain, its resistance changes, resulting in

an imbalance in the bridge. A voltage variation from

the referenced high accuracy source is generated and

translated to the difference amplifier through the buffer

stage. This voltage difference as a function of the strain

is converted into an output voltage (see Figure 28).

+

-

V+

V-

5V

1nF

(V1+V2+V3+V4)

1kΩ

5V

1kΩ

1nF

1kΩ

+

-

1kΩ

+

-

+

-

VARIABLE

SUBJECT TO

1kΩ

1kΩ

1kΩ

1kΩ

0V

FIGURE 28. STRAIN GAUGE AMPLIFIER

ISL55001