RATIOMETRIC VOLTAGE TRANSMITTER

AM417

analog microelectronics

April 99

6/6

APPLICATION FOR OUTPUT VOLTAGE 0.5...4.5V

The current application shows the basic functions of the AM417. With the given values of the ex-

ternal components (see List of External Components) the following application features are ad-

justed:

LIST OF EXTERNAL COMPONENTS

Symbol

Description

Value

Unit

BCW68H, BC557C (or similar)

low drop, high

β at10mA

PNP

500

Ω

15

Ω

Span (Gain adjustment)

500

Ω

1.5

k

Ω

typical transducer resistor

3.0 (typ.)

k

Ω

TC span compensation

10 – 120

k

Ω

Offset adjustment

0 – 500

Ω

TC offset adjustment

0.1 – 10.0

M

Ω

330

nF

± 10%

4.7

nF

± 10%

1.0

nF

C

1

C

2

R

1

R

4

R

3

C

3

R

O1

R

O2

R

TCS

R

TCO1

V

OUT

V

S

Ground

R

TCO2

V

IN

R

R

IA

4

5

8

7

1

AM417

2

Output

Stage

6

3

9R

1R

I

BR

OP

V

CC

T

1

R

2

Figure 5

The information provided herein is believed to be reliable; however, Analog Microelectronics assumes no responsibility for inaccuracies or omissions. Analog Microelectronics assumes no responsibility

for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licences to any of

the circuits described herein are implied or granted to any third party. Analog Microelectronics does not authorise or warrant any Analog Microelectronics product use in life support devices and/or

systems.

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