Overview
Features and Benefits
- Instrumentation Amplifier Front End
- Loop-Powered Operation
- Independently Adjustable Output Span and Zero
- Precalibrated Output Spans:
4-20 mA Unipolar
0-20 mA Unipolar
12 ± 8mA Bipolar - Precalibrated 20 mV or 60mV Input Spans
- Precalibrated 100 O 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 Details
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 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. The auxiliary amplifier may be used in combination with on-chip voltages to provide six precalibrated ranges for 100 (ohm) RTDs. Output span and zero are also determined by pin strapping to obtain the standard ranges: 4-20mA, 12 ± 8 mA and 0-20 mA.
Active laser trimming of the AD693's thin-film resistors result in high levels of accuracy without the need for additional adjustments and calibration. Total unadjusted error is tested on every device to be less than 0.5% of full scale at +25°C, and less than 0.75% over the industrial temperature range. Residual nonlinearity is under 0.05%. The AD693 also allows for the use of an external pass transistor to further reduce errors caused by self-heating.
For transmission of low-level signals from RTDs, bridges and pressure transducers, the AD693 offers a cost-effective signal conditioning solution. It is recommended as a replacement for discrete designs in a variety of applications in process control, factory automation and system monitoring.
The AD693 is packaged in a 20-pin ceramic side-brazed DIP, 20-pin Cerdip, and 20-pin LCCC and is specified over the -40°C to +85°C industrial temperature range.
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Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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Auto-Zero Amplifiers3/1/2010
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High-performance Adder Uses Instrumentation Amplifiers9/3/2009
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| AD693AD | Material Declaration | Reliability Data | 20-Lead CerDIP (Side Brazed) | |
| AD693AE | Material Declaration | Reliability Data | 20-Lead LCC | |
| AD693AQ | Material Declaration | Reliability Data | 20-Lead CerDIP | |
| Wafer Fabrication Data |
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