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+.