FEATURES
• Supply voltage range: 6...35V
• Wide operating temperature range:
–40°C...+85°C
• Adjustable voltage reference:
5 to 10V
• Additional current/voltage source
• Instrumentation amplifier input
CMVI: 1.5...Vcc-3V
• Operational amplifier input
Vin: 0...Vcc-5V
• Adjustable gain and offset
• Adjustable output voltage range:
0...Vcc-5V, e.g. 0.5...4.5V, 0...5/10V
• Individually configurable function
modules
• Protection against reverse polarity
• Output current limitation
• Short-circuit protection
• Protection against ESD
• RoHS compliant
GENERAL DESCRIPTION
AM401 and AM401P [2] are universal voltage
transmitters designed for differential bridge signal
conditioning. The two devices differ in their offset
and offset drift values. The ICs are modular and
their functional units individually accessible. Both
ICs consist of a high-precision instrumentation
amplifier for differential input signals and an
operational amplifier for input signals referenced
to ground. A robust reference voltage source
(adjustable between 5 and 10V) can be used to
power external components. An operational
amplifier stage whose gain is also adjustable acts
as an output. The devices also contain an
additional operational amplifier which can be used
as a current or voltage source. The IC is protected
against reverse polarity and has an integrated
output current limit. Standard industrial voltages
(e.g. 0–5/10V, 0.5–4.5V) can be easily generated
using transmitter ICs AM401 and AM401P.
APPLICATIONS
Application 1 – Differential input signal, voltage output signal of 0...5/10V
With applications which require an output voltage of 0...5/10V the pin used to configure the
instrumentation amplifier offset (ZA) is connected to the IC’s Ground. Gain G is set using the two
external resistors R1 and R2: