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AD693

更新时间: 2024-10-27 22:29:11
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亚德诺 - ADI /
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12页 499K
描述
Loop-Powered 4.20 mA Sensor Transmitter

AD693 数据手册

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Loop-Powered 4–20 mA  
Sensor Transmitter  
a
AD693  
FUNCTIONAL BLOCK DIAGRAM  
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  
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 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.  
1. The AD693 is a complete monolithic low-level voltage-to-  
current loop signal conditioner.  
2. Precalibrated output zero and span options include  
4–20 mA, 0–20 mA, and 12 ± 8 mA in two- and three-wire  
configurations.  
3. Simple resistor programming adds a continuum of ranges  
to the basic 30 mV and 60 mV input spans.  
4. The common-mode range of the signal amplifier input  
extends from ground to near the device’s operating voltage.  
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 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.  
5. Provision for transducer excitation includes a 6.2 V  
reference output and an auxiliary amplifier which may be  
configured for voltage or current output and signal  
amplification.  
6. The circuit configuration permits simple linearization of  
bridge, RTD, and other transducer signals.  
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.  
7. A monitored output is provided to drive an external pass  
transistor. This feature off-loads power dissipation to  
extend the temperature range of operation, enhance  
reliability, and minimize self-heating errors.  
8. Laser-wafer trimming results in low unadjusted errors and  
affords precalibrated input and output spans.  
9. Zero and span are independently adjustable and noninteractive  
to accommodate transducers or user defined ranges.  
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.  
10. Six precalibrated temperature ranges are available with a  
100 RTD via pin strapping.  
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.  
REV. A  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, nor for any infringements of patents or other rights of third parties  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 617/329-4700  
Fax: 617/326-8703  

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