Datasheet Analog Devices AD693AD

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FEATURES
Instrumentation Amplifier Front End
Loop-Powered Operation
Precalibrated 30 mV or 60 mV Input Spans
Independently Adjustable Output Span and Zero
Precalibrated Output Spans: 4–20 mA Unipolar
0–20 mA Unipolar
12 6 8 mA Bipolar
Precalibrated 100 V RTD Interface
6.2 V Reference with Up to 3.5 mA of Current Available
Uncommitted Auxiliary Amp for Extra Flexibility
Optional External Pass Transistor to Reduce
Self-Heating Errors PRODUCT DESCRIPTION Loop-Powered 4–20 mA
Sensor Transmitter
AD693
FUNCTIONAL BLOCK DIAGRAM 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 mA, two-wire current loop. An on-chip voltage
reference and auxiliary amplifier are provided for transducer
excitation; up to 3.5 mA 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 …