AD693AE - Loop-Powered 4-20mA Transmitter | Analog Devices
MPN： AD693AE ✓ 啟用中AD693AE 概覽
A transmitter interface is an analog signal-conditioning IC placed between a sensor and a two-wire industrial current loop. The sensor produces a low-voltage representation of the measured variable, the interface amplifies and calibrates that signal, and the transmitter converts it into a standardized current. Because the AD693AE derives operating power from the loop, it supports compact remote instrumentation without a separate local supply.
The AD693AE includes a precalibrated 60 mV input span and precalibrated output spans covering 4-20 mA unipolar, 0-20 mA unipolar, and 8 mA bipolar operation. Its output span and zero can be adjusted independently, allowing the same device to support different transducer sensitivities and measurement ranges. The manufacturer also identifies a precalibrated 100 Ω RTD interface capability.
Loop-powered operation constrains both circuit design and power availability. The transmitter must operate over a broad loop-supply range while retaining accurate output-current control, and its signal-conditioning circuitry must reject disturbances coupled through the long two-wire cable. Low-level sensor inputs also require attention to grounding, filtering, reference accuracy, and the relationship between input span and output calibration.
Typical uses include industrial process-pressure transmitters, temperature transmitters with resistance-based sensors, load-cell measurement systems, and other remote instrumentation that communicates through a 4-20 mA loop. A 100 Ω RTD interface can simplify thermocouple-free temperature measurement when the sensor and wiring meet the applicable electrical requirements.
When implementing the AD693AE, follow the manufacturer datasheet wiring and calibration procedures, verify the loop supply and burden voltage at both minimum and maximum load, and place filtering close to the input pins. Check the selected two-wire and three-wire sensor connection carefully because common-mode voltage and lead resistance can affect accuracy.
This page combines the manufacturer device description, verified package information, engineering-use guidance, and a qualification-focused comparison framework. It helps designers distinguish a true pin-compatible replacement from a merely similar transmitter before committing an existing PCB to a new source.
直接替換替代品，適用於 AD693AE — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD693AE （相同外形與佔位） — 差異在於 Mounting Type, Output Current Range, Package, Product Type.
AD693AR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD693AE 規格
| Product Type | Loop-powered 4-20 mA sensor transmitter |
| Signal Input | Low-level transducer voltage |
| Input Interface | Instrumentation amplifier front end |
| Precalibrated Input Span | 60 mV |
| Output Current Range | 4-20 mA |
| Precalibrated Output Span | 4-20 mA unipolar; 0-20 mA unipolar; 8 mA bipolar |
| Loop Supply | Loop-powered operation |
| Loop Configuration | Two-wire current loop |
| On-Chip Features | Voltage reference and auxiliary amplifier |
| RTD Interface | Precalibrated 100 ohm RTD interface |
| Calibration | Independently adjustable output span and zero |
| 封裝 | 20-CLCC (9 x 9 mm) |
| 安裝類型 | Surface mount |
AD693AE 20-clcc (9 x 9 mm) 腳位配置指南
AD693AE（20-clcc (9 x 9 mm) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： AD693AE.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD693AE 適用於 6 應用s: Industrial Pressure Transmitters, RTD Temperature Measurement, Load-Cell Signal Conditioning, Remote Process Instrumentation, Current-Loop Signal Conditioning, Environmental Monitoring Sensors.
Industrial Pressure Transmitters
The AD693AE fits low-level pressure-bridge or pressure-sensor interfaces that ultimately require a standardized 4-20 mA field signal. Its instrumentation-amplifier front end and precalibrated 60 mV input span provide a defined starting point for common millivolt-level sensors, while independent output-span and zero adjustment supports final calibration. The device is placed between the sensor and the two-wire loop, with the loop supplying operating power. Designers must still verify excitation voltage, bridge output range, loop-supply margin, and receiver burden voltage.
推薦
RTD Temperature Measurement
The AD693AE can support a compatible 100 Ω RTD measurement path because the Analog Devices AD693 family includes a precalibrated 100 Ω RTD interface. This can simplify remote temperature instrumentation that must transmit over a two-wire 4-20 mA loop. The transmitter derives power from the loop and converts the resistance-derived signal into current suitable for a remote receiver. For reliable results, use the manufacturer’s connection diagram, account for lead resistance and insulation, confirm the sensor’s excitation and accuracy limits, and verify adequate loop voltage at the end of the cable.
推薦
Load-Cell Signal Conditioning
The AD693AE is appropriate when a load cell produces a low-level differential signal and the installation requires a remote, two-wire current output. The instrumentation-amplifier front end supports the 60 mV precalibrated span, reducing the amount of front-end conditioning required for common strain-gauge bridges. Independent span and zero controls permit calibration after mechanical installation. The complete system must remain within the input limits of the selected configuration, and excitation drift, bridge symmetry, lead resistance, grounding, and loop-supply variation should be included in the error budget.
推薦
Remote Process Instrumentation
The AD693AE supports remote process instrumentation where field sensors are connected over long two-wire cables and communicate using 4-20 mA. Loop-powered operation removes the need for a separate supply at the sensing point, while the standardized output simplifies connection to control-room receivers and distributed control systems. The design must retain adequate loop power after cable losses and receiver burden are considered. Protection against surge, reverse polarity, and incorrect wiring is also important in industrial environments, so the installed protection network should be checked against the transmitter’s limits.
推薦
Current-Loop Signal Conditioning
The AD693AE can serve as the signal-conditioning element between a low-level voltage sensor and a standardized current-loop transmitter. Its selectable output spans cover 4-20 mA unipolar, 0-20 mA unipolar, and 8 mA bipolar operation, allowing the receiver interface to match the system’s live-zero or bipolar convention. Because the output span and zero are independently adjustable, calibration can compensate for the transducer’s offset and sensitivity. Confirm the receiver scaling, alarm thresholds, loop resistance, and supply range before releasing a production design.
推薦
Environmental Monitoring Sensors
The AD693AE is suitable for compact remote sensing installations using compatible millivolt-level environmental transducers where a two-wire current loop provides both operating power and data transmission. The monolithic transmitter can reduce the amount of discrete analog circuitry in the field enclosure. Its 20-CLCC package supports surface-mount assembly but requires a dedicated footprint and careful thermal management. The design should validate the sensor output against the 60 mV precalibrated span, provide input filtering appropriate to the interference environment, and ensure that the available loop voltage remains adequate at maximum current.
推薦
推薦產品摘要
工程參考資料，適用於 AD693AE — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD693AR | AD693 |
|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-CLCC (9 x 9 mm) | 20-CLCC (9 x 9 mm) | 20-CLCC (9 x 9 mm) |
| Product Type | Loop-powered 4-20 mA sensor transmitter | Loop-powered 4-20 mA sensor transmitter | Loop-powered 4-20 mA sensor transmitter |
| Input Interface | Instrumentation amplifier front end | Instrumentation amplifier front end | Instrumentation amplifier front end |
| Precalibrated Input Span | 60 mV | 60 mV | 60 mV |
| Output Span | 4-20 mA unipolar; 0-20 mA unipolar; 8 mA bipolar | 4-20 mA unipolar; 0-20 mA unipolar; 8 mA bipolar | 4-20 mA unipolar; 0-20 mA unipolar; 8 mA bipolar |
| Loop-Powered Operation | Yes | Yes | Yes |
| RTD Interface | Precalibrated 100 ohm RTD interface | Precalibrated 100 ohm RTD interface | Precalibrated 100 ohm RTD interface |
| Output Calibration | Independently adjustable output span and zero | Independently adjustable output span and zero | Independently adjustable output span and zero |
主要差異化特點
- Integrated low-level sensor conditioning (對比AD693AR)
- Multiple factory-calibrated loop-current conventions (對比AD693)
- Loop-powered operation with local 100 ohm RTD support (對比AD693AR)
設計說明
Validate loop power at the transmitter rather than only at the supply. The AD693AE is loop-powered, so its operating margin must include the transmitter requirements, receiver burden, and cable resistance at the highest intended output current. Check both minimum-current and full-scale operating points across temperature. If the calculated loop voltage is insufficient, reduce cable resistance or select a lower-burden receiver instead of assuming that nominal supply voltage is sufficient.
Use the official 20-CLCC footprint and follow the manufacturer’s pin configuration rather than adapting a generic 20-pin SOIC land pattern. Place input filtering and sensor connections close to the device, keep sensitive nodes compact, and provide the calibration access required for span and zero adjustment. Preserve a clear ground-return path and inspect the assembled board for unintended solder bridges between closely spaced ceramic-package leads.
Avoid choosing the output convention from current range alone. The transmitter supports 4-20 mA unipolar, 0-20 mA unipolar, and 8 mA bipolar spans, and the receiving system must interpret zero and full scale consistently. Also confirm whether the sensor uses two-wire or three-wire excitation and whether its output fits the selected input span. Incorrect span selection can create calibration errors that cannot be corrected by trim adjustments.
Evaluate the transmitter’s internal power dissipation at maximum loop voltage and operating current using the manufacturer’s electrical characteristics. Estimated: calculate the excess loop voltage after subtracting the transmitter and receiver requirements, multiply it by the maximum current, and compare the resulting device dissipation with the package and ambient-temperature limits. Use the smallest practical loop voltage and provide suitable copper area around the ceramic package when the installation is enclosed.
合規資訊
Compliance declarations were not identified in the verified product, datasheet, or distributor records for this exact ordering code.
