AD693
FEATURES
Instrumentation Amplifier Front End Loop-Powered Operation Precalibrated 30 m V or 60 m V Input Spans Independently Adjustable Output Span and Zero Precalibrated Output Spans: 4- 20 m A Unipolar 0- 20 m A Unipolar 12 ؎ 8 m A Bipolar Precalibrated 100 ⍀ RTD Interface 6.2 V Reference with Up to 3.5 m A of Current Available Unmitted Auxiliary Amp for Extra Flexibility Optional External Pass Transistor to Reduce Self-Heating Errors
Loop-Powered 4- 20 m A Sensor Transmitter AD693
FUNCTIONAL BLOCK DIAGRAM
PRODUCT DESCRIPTION
PRODUCT HIGHLIGHTS
The AD693 is a monolithic signal conditioning circuit which accepts low-level inputs from a variety of transducers to control a standard 4- 20 m A, two-wire current loop. An on-chip voltage reference and auxiliary amplifier are provided for transducer excitation; up to 3.5 m A of excitation current is available when the device is operated in the loop-powered mode. Alternatively, the device may be locally powered for three-wire applications when 0- 20 m...
