Analog Devices AD693
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. Active laser trimming of the AD693’s thin-film resistors result in high levels of accuracy without the need for additional adjustments and calibration.| Part No. | AD693 |
|---|---|
| Datasheet | AD693 Download |
| Manufacturer |  Analog Devices |
| Description | Loop-Powered 4.20 mA Sensor Transmitter |
| Buy | Stock & Price |
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 ؎ 8 mA Bipolar Precalibrated 100 ⍀ 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 Loop-Powered 4–20 mA Sensor Transmitter AD693 FUNCTIONAL BLOCK DIAGRAM PRODUCTDESCRIPTION
PRODUCT HIGHLIGHTS 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 0–20 mA operation is desired. Precalibrated 30 mV and 60 mV input spans may be set by simple pin strapping. Other spans from 1 mV to 100 mV may be realized with the addition of external resistors.
