FEATURES

• Instrumentation amplifier with a wide

input voltage range

• Adjustable gain and offset

• Parallel analog voltage (e.g. 0...5/10V)

and current (e.g. 0/4...20mA) output

• Two and three-wire operation

• Protection against reverse polarity and

short-circuiting

• Output current limitation

• Integrated current source

• Adjustable integrated reference voltage

source: 4.5 to 10V

• Supply voltage: 6...35V

• Wide operating temperature range:

-40°C...+85°C

• Individually accessible function modules

• RoHS compliant

• Two package variants: SOP and SSOP

GENERAL DESCRIPTION

AM400 is a monolithically integrated measuring

amplifier with a parallel current and voltage

output which has been specifically developed for

the processing of differential input signals.

AM400 consists of various functional modules.

It contains both an instrumentation amplifier

input and an input for signals referenced to

ground. One particular feature of the device is

the current and voltage outputs which can be

used simultaneously. The output ranges can be

selected using external resistors, enabling

AM400 to be configured for the analog

0/4...20mA and 0...5/10V industrial power network, for example. Integrated voltage and

current sources covering a wide range of values

can be used to power external components.

AM400 has been designed for ideal use with

external processors (such as a microprocessor,

for example, for signal correction [1])

APPLICATIONS

1) Typical 3-wire application with a differential input signal

In 3-wire operation (cf. Figure 5, for example) the IC ground (pin GND) is connected up to the

external ground of the system (Ground). The system’s supply voltage VS is connected to pin VCC

and pin VCC to pin RS+.