INDUSTRIAL VOLTAGE AMPLIFIER IC

AM401

analog microelectronics

Mars 2006

Analog Microelectronics GmbH

Phone:

+49 (0)6131/91 073 – 0

15/21

An der Fahrt 13, D – 55124 Mainz

Fax:

+49 (0)6131/91 073 – 30

Rev. 2.3

Internet: http://www.analogmicro.de

Email:

info@analogmicro.de

Application 4 – Input voltage (referenced to ground) of 0...1V and output voltage of 0...10V

For a signal of VIN = 0...1V at the OP1 input the external components are to be dimensioned in such

a way that there is an output voltage range of VOUT = 0...10V. Using the values in Equation 4 the

settable gain has a value of:

10

V

1

V

10

max

max

1

=

=

=

IN

OUT

OP

V

V

G

where VIN is the voltage at OP1 input pin INOP.

According to Equation 5 the below value is calculated for the resistance ratio of the adjustment

resistors:

9

1

1

2

1

=

−

=

OP

G

R

R

With reference to the boundary conditions for external components given on page 6 the following

values are obtained:

R1 ≈ 90kΩ

R2 = 10kΩ

RREF = 5kΩ

C1 = 2.2µF

C

1

R

2

R

REF

R

1

Ground

V

OUT

INOP = IN

V

CC

1

2

3

4

14

13

5

6

11

15

12

V

BG

CVREF

CVSET

IN+

IN_

GND

ZA

OUTIA

INOP

7

8

GAIN

VOUT

VCC

VREF

VSET

Voltage Reference

AM401

+

_

OP2

+

_OP1

+

_ IA

Figure 6:

AM401 with an OP input stage