UNIVERSAL AMPLIFIER IC

AM400

analog microelectronics

October 2005

Analog Microelectronics GmbH

Phone:

+49 (0)6131/91 073 – 0

17/21

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

4) Application for the 16-pole version of AM400 (3-wire application)

Figure 8 gives a 3-wire application which uses the 16-pole version of AM400 (Figure 11). The

dimensions of this specific application are no different from those of the 3-wire setup illustrated in

Figure 5; no detailed description shall thus be given here. One difference, however, lies in the fact

that the minimum voltage at the IA output cannot be reduced by connecting up external load resistor

RLIA. Particularly with small differential input signs and the large GOP gain these entail a “correct”

value of 0V cannot be obtained at IC output VOUT (cf. the comments on VOUTIA in the electrical

specifications). For this reason the 20-pole version of AM400 is preferable for small signals.

Ground

V

S

I

OUT

V

OUT

R

1

R

2

R

3

R

4

C

1

R

0

T

1

D

1

R

5

R

L

R

SET

AM400-1

3

4

2

V

BG

13

5

14

12

11

10

9

8

16

V

I

15

5V Reference

OP3

1

7

6

IA

OP1

3-wire connection

V

OUTIA

The minimum voltage

at the IA output is 16mA

OP2

AM400-1

Figure 8:

Typical application for the 16-pole version of AM400 (3-wire)