AM457 is a high-precision integrated amplifier whichhas been developed to condition signals from smalldifferential input voltages within a range of a fewmillivolts (±5 to ±100mV FS). The chief componentof the IC is a highly accurate, low-noise amplifiercircuit (AMP). An additional integrated operationalamplifier (OP) can be used to supply a sensingelement with current or record temperature for sensorbridges powered by voltage, for example. The entiresystem (sensing element plus amplifier) is monitoredby the integrated diagnostic unit which logs anysensing element errors or defects, systemundervoltage, AMP overloads and excessivetemperature. The various function groups are notmutually dependent on one another; the AMP can beoperated independently of the OP, for example. Thefunctionality of both component groups (AMP andOP) is autonomous with regard to the diagnostic unit.AM457 is a combination of high-impedance precisionamplifier, additional OP and extensive diagnostic unit,enabling a self-monitoring sensor system to beassembled using very few components.
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