FEATURES
• Instrumentation amplifier input for
positive input voltages: 0...200mV
• Adjustable gain
• Common mode input range (CMIR):
1.3…VCC - 2.2V
• Output voltage ratiometric to the
supply: 0.5...4.5V
• Low offset
• Low offset drift
• Supply voltage range:
5V ± 5% (ratiometric range)
• Wide operating temperature range:
-40°C...+125°C
• Ratiometric current source for the
supply of external measuring cells
• Output driver (PNP open collector):
IOUT = +11mA
• No limited resolution
• Output current limitation
• Low internal noise
• Integrated EMC protection
• Small SO8 package
• Low cost
DESCRIPTION
AM417 is a low-cost ratiometric interface IC
which has been specifically designed for the
conditioning of differential signals. The IC is
particularly suitable for the signal evaluation of
sensor elements which have to be powered by
an internal current source (OP). These include
piezoresistive and magnetoresistive silicon
measuring cells and temperature sensing
elements based on a resistor setup. In essence
AM417 consists of a precision instrumentation
amplifier, a ratiometric operational amplifier
and a protected voltage output which has been
configured as a driver stage. The amplifier can
be adjusted across a wide range using two
external resistors and the offset of an additional
resistor affixed to the measuring bridge.
Precision amplifier AM417 has been
engineered in such a way that it can be used as
an instrumentation amplifier for follow-on
processors or A/D converters to make optimum
use of the converter range.