AD693AQ - Loop-Powered 4-20 mA Sensor Transmitter | ADI
MPN: AD693AQ ✓ نشطAD693AQ نظرة عامة
A sensor transmitter is an interface circuit that conditions a physical measurement into a standardized signal suitable for long-distance industrial wiring. The AD693 belongs to the signal-conditioning IC hierarchy, combining an instrumentation-amplifier front end, voltage-to-current conversion, excitation circuitry, and current-loop control in one device. This integration reduces the number of discrete components required when designing process-control, automation, and monitoring systems.
The AD693AQ offers factory-calibrated input and output ranges. The manufacturer describes preset 30 mV and 60 mV input spans, with intermediate spans supported by the loop-powered specification arrangement. Its precalibrated output configurations include standard 4-20 mA, unipolar 0-20 mA, and an 8 mA bipolar range. The on-chip voltage reference and auxiliary amplifier can supply up to 3.5 mA of transducer excitation when operating in loop-powered mode.
Loop-powered operation allows the transmitter to derive operating power from the same two-wire loop used to carry the measurement current. This topology is valuable where field wiring cannot include a separate supply conductor. The AD693 datasheet states that loop-powered specifications apply when the device operates as a loop-powered transmitter, making supply headroom and loop impedance essential parts of system-level design.
Typical applications include process-control transmitters, factory automation interfaces, remote temperature monitoring, RTD instrumentation, and system-monitoring equipment. The AD693 is particularly appropriate when a transducer produces a low-level millivolt signal and the destination system expects a conventional 4-20 mA input. Its integrated excitation and reference functions can simplify sensor conditioning while preserving a standardized field interface.
Designers should verify the complete electrical configuration for the selected AD693 ordering option before applying a board-level compensation. The 20-pin CDIP package is intended for through-hole assembly, and loop-powered operation imposes minimum voltage-drop and current-budget requirements across the sensor, wiring, and receiver. Component values should be selected from the manufacturer application and pin-description tables rather than inferred from generic current-loop examples.
This page combines the manufacturer’s operating concept, package information, calibrated ranges, and application guidance with practical sourcing and design context. It also distinguishes the verified AD693AD comparison candidate from unverified alternatives, helping engineers avoid treating package similarity or a similar product description as proof of a true drop-in replacement.
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الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع AD693AQ (نفس عامل الشكل والبصمة) — يختلف في Auxiliary Amplifier, Input Signal Type, Package, Powering Method, Product Type.
AD693AD
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عرض ورقة البيانات ←AD693AQ الحدود القصوى والخصائص الكهربائية
| Product Type | Loop-powered 4-20 mA sensor transmitter and signal-conditioning IC |
| Input Signal Type | Low-level voltage from transducers |
| Precalibrated Input Spans | 30 mV and 60 mV |
| Precalibrated 4-20 mA Output Span | 4-20 mA unipolar |
| Alternative Precalibrated Output Spans | 0-20 mA unipolar and 8 mA bipolar |
| RTD Interface | 100 Ω RTD |
| Maximum Transducer Excitation Current | 3.5 mA in loop-powered mode |
| On-Chip Reference | Voltage reference |
| Auxiliary Amplifier | Provided for transducer excitation |
| Front End | Instrumentation amplifier |
| تكوين الخرج | Two-wire current loop |
| Powering Method | Loop-powered operation |
| العلبة | 20-pin CDIP |
| نوع التركيب | Through-hole |
| نطاق درجة حرارة التشغيل | -40 °C to +85 °C |
دليل تكوين أطراف AD693AQ 20-pin cdip
تكوين الأطراف لـ AD693AQ (حزمة 20-pin cdip). يتم تعريف ترقيم الأطراف والوظائف ومخططات التوصيل في ورقة البيانات الفنية من الشركة المصنعة. راجعها للحصول على البصمة الدقيقة وإرشادات اللحام.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ AD693AQ.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
AD693AQ مناسب لـ 6 التطبيقs: Process-Control Sensor Interface, Factory Automation Signal Conditioning, Remote Temperature Monitoring, System Monitoring Instrumentation, Low-Level Voltage Sensor Interface, Industrial Pressure Transmitter.
Process-Control Sensor Interface
The AD693AQ fits process-control equipment that receives a low-level transducer signal and must transmit it over a standardized two-wire current loop. Its instrumentation-amplifier front end accepts the factory-calibrated 30 mV and 60 mV input spans, while the output stage supports 4-20 mA unipolar operation. Loop-powered architecture eliminates a separate supply conductor, making the circuit useful where field wiring is limited. The internal voltage reference and auxiliary amplifier can provide up to 3.5 mA of excitation in loop-powered mode. Designers must still verify the loop voltage budget, sensor loading, output accuracy, and polarity in the final instrumentation schematic.
موصى به
Factory Automation Signal Conditioning
AD693AQ is appropriate for factory automation modules that need to convert a weak sensor output into a noise-resistant current-loop signal for a controller or distributed I/O system. The device combines an instrumentation amplifier, voltage-to-current signal path, voltage reference, and excitation amplifier in a 20-pin CDIP package. Precalibrated 4-20 mA and 0-20 mA output spans support conventional industrial receiver inputs. Because the transmitter can operate from loop power, it suits compact field modules with minimal wiring. Engineering validation should include worst-case loop resistance, available compliance voltage, transducer excitation requirements, startup behavior, and isolation strategy before the board is deployed.
موصى به
Remote Temperature Monitoring
The AD693AQ can form the measurement front end of a remote temperature-monitoring transmitter when the selected AD693 configuration supports the required transducer type and calibration. The manufacturer identifies a 100 Ω RTD interface, precalibrated millivolt input spans, and a selectable 4-20 mA output. Loop-powered operation is especially useful in remote field installations because the measurement and transmitter power share the same two conductors. The auxiliary amplifier can supply up to 3.5 mA for transducer excitation in loop-powered mode. Confirm the actual sensor excitation requirements, lead resistance, isolation, and cold-junction or linearization strategy for the specific RTD measurement before releasing the circuit.
موصى به
System Monitoring Instrumentation
AD693AQ is suitable for system-monitoring equipment that needs to bring a low-level sensor measurement into a long-distance industrial data path. Its two-wire 4-20 mA output is designed for transmitters operating from the loop itself, reducing the number of conductors required between a field sensor and monitoring equipment. The device offers precalibrated 30 mV and 60 mV input spans together with 4-20 mA, 0-20 mA, and 8 mA bipolar output options. The 20-pin CDIP construction supports through-hole assembly and serviceable industrial equipment. Validate the transmitter against the receiver’s input range, loop resistance, surge environment, grounding arrangement, and calibration requirements for production deployment.
موصى به
Low-Level Voltage Sensor Interface
The AD693AQ provides a practical interface when a transducer produces a low-level voltage rather than a directly compatible digital measurement. Its instrumentation-amplifier front end and factory-calibrated 30 mV and 60 mV spans reduce the amount of external signal conditioning required before the measurement becomes a standard current-loop output. The internal voltage reference supports repeatable transducer excitation, and the auxiliary amplifier can deliver up to 3.5 mA in loop-powered operation. Engineers should select the proper output span, account for source impedance and sensor loading, and confirm that the available loop voltage can support both transmitter operation and excitation current.
موصى به
Industrial Pressure Transmitter
AD693AQ can form the core of a pressure or force transducer transmitter when the sensor produces a compatible low-level voltage. The device accepts the AD693 family’s precalibrated 30 mV and 60 mV spans and converts the conditioned measurement into a 4-20 mA two-wire output suitable for long cable runs. The on-chip reference and auxiliary excitation amplifier provide up to 3.5 mA of current in loop-powered mode, reducing external sensor-support circuitry. For a pressure-transmitter design, verify sensor excitation sensitivity, bridge or potentiometric output range, loop compliance, electrical isolation, overload protection, and calibration temperature behavior against the mechanical operating environment.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ AD693AQ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | AD693AD |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Product Type | Loop-powered 4-20 mA sensor transmitter | Loop-powered sensor transmitter |
| Maximum Excitation Current | 3.5 mA in loop-powered mode | 3.5 mA |
| Powering Method | Two-wire loop-powered operation | Loop-powered operation |
أبرز الفروقات
- Specified 20-pin CDIP construction (مقابلAD693AD)
- Factory-calibrated output options (مقابلAD693AD)
- Integrated loop-powered transducer excitation (مقابلAD693AD)
- Broad set of calibrated input spans (مقابلAD693AD)
ملاحظات التصميم
Evaluate the complete two-wire loop as a power and signal path. The AD693AQ can operate from loop power and can provide up to 3.5 mA of transducer excitation, so the receiver voltage, cable resistance, transmitter dropout, sensor current, and load resistance must share one compatible budget. Start with the maximum cable length and load used in service rather than a short bench connection. Confirm the selected AD693 configuration’s current consumption and supply limits against the manufacturer electrical table.
Assign the PCB footprint from the exact AD693AQ package drawing and lead numbering, not from the generic AD693 family name. The AD693AQ is a 20-pin CDIP through-hole device, and the manufacturer also lists other package constructions for the AD693 family. Verify pin orientation, notch or ceramic-package orientation, lead pitch, and row spacing on the physical part before routing traces. Use the pin-description table to distinguish supply, signal, reference, excitation, and output-current functions.
Do not assume that AD693AD is interchangeable merely because it belongs to the same family. Confirm its package, lead arrangement, calibration span, electrical limits, and operating-temperature specification against the AD693AQ requirements. Likewise, do not select a generic 4-20 mA transmitter on output-current compatibility alone; loop-powered startup, excitation capability, accuracy, and pin function can differ. Preserve the exact MPN in documentation and incoming-inspection records to prevent package-option mixing.
معلومات الامتثال
No specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration is stated for AD693AQ. The industrial-temperature grade is not presented as an automotive qualification.
