Industrial V/I Converter and Protector IC

AM462

analog microelectronics

December2006

Analog Microelectronics GmbH

Phone: +49 (0)6131/91 073 - 0

10/20

An der Fahrt 13, D – 55124 Mainz

Fax:

+49 (0)6131/91 073 – 30

Rev. 2.4

Internet: http://www.analogmicro.de

Email:

info@analogmicro.de

The working range resulting from Equation 6 is described in Figure 4. Example calculations and

typical values for the external components can be found in the example applications from page 13

onwards.

Using OP2 as a current source

The additional operational amplifier OP2 can easily be connected up as a constant current source.

Using the circuit in Figure 5 the following applies:

Example : OP2 as courrent source

SET

SET

BG

S

R

R

V

I

V

27

.

1

=

=

(8)

The bridge symbol represents the component to be supplied with current (e.g. a piezoresistive

sensing element or temperature sensor).

Ω

=

=

=

k

27

.

1

mA

1

V

27

.

1

S

BG

SET

I

V

R

V

BG

AM462

OP2

1

R

SET

OP2 connected as

current source

2

I

S

Figure 5: Using OP2 as a constant current source