AMPLIFIER AND PROTECTION IC

AM461

analog microelectronics

October 2002

3/8

FEATURES

• Supply Voltage Range: 6...35V

• Wide Operating Temperature Range:

–40°C...+85°C

• Voltage Reference: 5V

• Additional Voltage/Current Source

• Operational Amplifier Stage with Inte-

grated Driver Output

• Adjustable Gain

• Adjustable Output Voltage Range e.g.

0...5/10V, others

• Reverse Polarity Protection

• Short Circuit Protection

• Output Current Limitation

• Low-Cost: Replaces a Multitude Number

of Discrete Components

DESCRIPTION

The AM461 is a universal useable amplifier and

protection IC with a multitude of additional func-

tions. The IC contains of an externally adjustable

operational amplifier for conditioning of single

ended input signals. This amplifier has an inte-

grated output driver stage with the ability to source

up to 5mA without the need of any external tran-

sistor. In addition, a voltage reference for the supply

of external components and another operational

amplifier that can be used as current/voltage source

or comparator is integrated.

Basic features of the IC are the wide range inte-

grated of protection functions. The IC is protected

against reverse polarity and has a build-in output

current limitation. Using the amplifier IC AM461 it

is possible to generate stable standard voltages ranges

(e.g. 0-5/10V) in an easy and low-cost way.

BLOCK DIAGRAM

VREF

VOUT

GND

INN

VCC

CVREF

CVSET

V

BG

Voltage Reference

AM461

OP2

OP1

INP

1

2

3

7

4

5

6

8

Figure 1: Block diagram AM461