UNIVERSAL AMPLIFIER IC

AM400

analog microelectronics

October 2005

Analog Microelectronics GmbH

Phone:

+49 (0)6131/91 073 – 0

11/21

An der Fahrt 13, D – 55124 Mainz

Fax:

+49 (0)6131/91 073 – 30

Rev.: 4.2

Internet: http://www.analogmicro.de

Email:

info@analogmicro.de

Setting the voltage gain using the voltage output

When using the IA and amplifier stages OP1 and OP2 for further signal conditioning the overall

output voltage is calculated by multiplying Equations 1, 2 and 3 to:

()

OP

GAIN

ZA

IN

IA

OUT

G

G

V

V

G

V

⋅

⋅

+

=

(7)

Setting the output current range and compensating for the offset using the current output

When using the IA together with amplifier stage OP1 and the V/I converter for further signal

conditioning the offset of the output current should first be compensated for. To this end the two IA

electrical specifications on page 5). With the short circuit at the input the values of the output

current according to Equation 4 and an external voltage divider (e.g. Figure 5) are as follows:

()

SET

IN

OUT

I

V

I

=

= 0

with

4

3

4

0

2

R

R

R

R

V

I

REF

SET

+

⋅

=

(8)

SET

I

IN

OUT

I

R

G

V

I

+

=

0

8

with

GAIN

IA

I

G

G

G

⋅

=

and

0

=

ZA

V

(9)

Selecting the supply voltage

operation.

application. The following applies:

V

5

≥

OUT

S

V

V

(10)

min

max

CC

L

OUT

S

V

R

I

V

+

≥

(11)