ISO122JU/1K - 50kHz Isolation Amp | Texas Instruments
Артикул: ISO122JU/1K ✓ АктивенISO122JU/1K Обзор
An isolation amplifier is a specialized signal-conditioning IC that combines input amplification, electrical isolation, and output amplification in one package. In the broader semiconductor hierarchy, it belongs to the analog amplifier family and the industrial signal-chain category. Its capacitive barrier separates the input side from the output side, allowing measured voltages to be transferred safely while minimizing common-mode interference and ground-potential errors.
The ISO122JU/1K offers maximum nonlinearity of 0.020%, input offset-voltage drift of 200 V/°C, and a nominal 2 pF differential capacitive barrier. Its fixed unity-gain architecture simplifies implementation by avoiding an external feedback network. The 50 kHz bandwidth supports rapidly changing process-control and instrumentation signals, although it is not intended for high-frequency communications waveforms.
Operationally, the ISO122 uses a novel duty-cycle modulation and demodulation technique to transmit the input signal digitally across the differential capacitive barrier. This architecture supports bipolar input operation and fixed unity gain while maintaining a compact 8-pin SOIC footprint. The verified manufacturer listing identifies 5 mA quiescent current on VS1 and ±5.5 mA on VS2, with a 4.5 V to 18 V power-supply range.
Typical uses include industrial process-control loops, motor and solenoid current monitoring, power-supply feedback isolation, high-voltage sensor interfaces, data-acquisition systems, and isolated communications front ends. The 1500 Vrms working isolation rating and high-frequency common-mode rejection are particularly useful when a sensor ground differs substantially from the measurement-system ground.
Designers should verify the complete power-supply arrangement, input common-mode range, isolation boundary, and output-load requirements against the manufacturer datasheet. The input and output grounds must remain isolated from one another; joining them would bypass the principal safety function. Decoupling should be placed directly at the supply pins, while the analog input path should minimize leakage and high-impedance contamination around the sensitive input node.
This product data combines verified manufacturer specifications, distributor availability, package information, and explicitly qualified replacement analysis. It also distinguishes genuine drop-in alternatives from merely similar isolation amplifiers, helping engineers avoid substitutions that change pin functions, supply requirements, signal bandwidth, or isolation architecture.
Аналоги без доработки для ISO122JU/1K — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
ISO122U/1K
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Открыть даташит →ISO122JU/1K Максимальные параметры и электрические характеристики
| Product Type | Precision isolation amplifier |
| Number of Circuits | 1 circuit |
| Input Signal Range | ±10 V |
| Signal Bandwidth | 50 kHz |
| Working Isolation Voltage | 1500 Vrms |
| Maximum Nonlinearity | 0.020% |
| Input Offset Voltage Drift | 200 V/°C |
| Power Supply Range | 4.5 V to 18 V |
| VS1 Quiescent Current | 5 mA |
| VS2 Quiescent Current | ±5.5 mA |
| Gain Configuration | Fixed unity gain |
| Input Operation | Bipolar operation |
| Differential Capacitive Barrier | 2 pF |
| Signal Transfer Method | Duty-cycle modulation and demodulation |
| Корпус | 8-pin SOIC |
| Тип монтажа | Surface mount |
| High-Voltage Breakdown Testing | 100% tested to 1500 Vrms |
Руководство по цоколевке ISO122JU/1K в корпусе 8-pin soic
Цоколевка для ISO122JU/1K (корпус 8-pin soic). Этот аналоговый компонент имеет выводы входа, выхода и питания. Обратитесь к техническому описанию производителя для конфигураций выводов балансировки нуля, коррекции и разрешения. Идеально подходит для схем обработки сигналов и усилителей.
Нет подробных данных о распиновке для ISO122JU/1K.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
ISO122JU/1K подходит для 6 применениеs: Industrial Process-Control Sensing, Power-Supply Feedback Isolation, Motor and Solenoid Monitoring, High-Voltage Sensor Interfaces, Data-Acquisition Systems, Isolated Communications Front Ends.
Industrial Process-Control Sensing
The ISO122JU/1K fits industrial process-control loops that measure a bipolar voltage from a field sensor while the controller is connected to a different ground potential. Its ±10 V input range directly accommodates many analog process signals, while the 1500 Vrms working isolation limit helps maintain separation across the barrier. The 50 kHz bandwidth is sufficient for many temperature, pressure, and position feedback loops, and fixed unity gain avoids external feedback components. Designers should keep the input return isolated from the output return and verify the sensor’s common-mode limits before connection.
Рекомендуется
Power-Supply Feedback Isolation
The ISO122JU/1K can transfer a power-converter feedback voltage across an isolation boundary without connecting the primary and secondary grounds. The fixed unity gain provides a direct signal path from a ±10 V sensing range, and the 50 kHz bandwidth can follow control-loop and supervisory signals that are not high-frequency. The 4.5 V to 18 V supply range accommodates conventional isolated-side rails. Because this is a voltage-sensing amplifier rather than a dedicated shunt amplifier, the source impedance and input filtering must be selected so that the sensing network does not disturb the power stage.
Рекомендуется
Motor and Solenoid Monitoring
The ISO122JU/1K is appropriate for monitoring scaled motor-drive or solenoid-control voltages where the measurement ground is electrically noisy or at a different potential. Its 1500 Vrms working isolation supports a reinforced separation between the sensed power circuit and low-voltage control electronics, while the 50 kHz bandwidth captures transient-control information more effectively than a very slow instrumentation amplifier. The ±10 V input range is useful for conditioned shunt or control-node measurements. The circuit should use short, guarded input routing and separate supply decoupling so switching transients do not couple across the barrier.
Рекомендуется
High-Voltage Sensor Interfaces
The ISO122JU/1K can serve as the isolation stage between a high-voltage sensor network and a low-voltage data-acquisition or processing system. Its working isolation voltage of 1500 Vrms and 100% high-voltage breakdown testing provide defined manufacturing assurance, while the fixed unity gain simplifies conditioning of a bipolar sensor output. A 50 kHz bandwidth allows measurement of moderately varying sensor signals without relying on a slow isolated amplifier. Designers must still confirm the input common-mode range, creepage, clearance, barrier layout, and applicable insulation requirements because those details cannot be inferred from the package rating alone.
Рекомендуется
Data-Acquisition Systems
The ISO122JU/1K is useful in data-acquisition systems where an analog voltage must be digitized on equipment grounds separated from the source. Its ±10 V bipolar input directly supports industrial sensor ranges, and its fixed unity gain avoids a feedback network that could complicate board-level isolation routing. The 50 kHz bandwidth is adequate for many multiplexed measurement channels and supervisory signals. When designing the front end, verify input impedance, output settling behavior, channel switching requirements, and the ADC interface; the isolation amplifier protects the barrier but does not replace an antialiasing filter or input protection network.
Рекомендуется
Isolated Communications Front Ends
The ISO122JU/1K can provide the analog measurement channel in an isolated communications or industrial interface that accepts command feedback or sensor information. Its 50 kHz bandwidth handles many supervisory and analog-control signals, while 1500 Vrms working isolation maintains separation between field wiring and system electronics. The fixed unity-gain architecture keeps the analog path compact, and the ±10 V range is compatible with common bipolar interface levels after appropriate scaling. The application should not be treated as a high-speed communications modem; designers must separately evaluate communication bandwidth, ESD protection, and isolation requirements for the digital transceiver.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ISO122JU/1K — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ISO122U/1K |
|---|---|---|
| Product Type | Precision isolation amplifier | Precision isolation amplifier |
| Brand | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC |
| Input Signal Range | ±10 V | ±10 V |
| Signal Bandwidth | 50 kHz | 50 kHz |
| Working Isolation Voltage | 1500 Vrms | 1500 Vrms |
| Power Supply Range | 4.5 V to 18 V | 4.5 V to 18 V |
| Gain Configuration | Fixed unity gain | Fixed unity gain |
Ключевые отличия
- Verified 50 kHz signal bandwidth (против ISO122U/1K)
- Direct bipolar voltage-sensing range (против ISO122U/1K)
- Fixed isolated measurement architecture (против AD210KN)
Заметки по проектированию
Provide separate, correctly polarized supplies for VS1 and VS2 within the verified 4.5 V to 18 V range. The verified quiescent currents are 5 mA on VS1 and ±5.5 mA on VS2. Place low-ESR decoupling capacitors directly beside each supply and ground pin, keep the two return paths physically separate, and avoid routing output-side copper beneath or across the input-side isolation boundary. This preserves the intended galvanic separation and limits switching-current coupling.
Treat the input side as a high-impedance analog region. Keep the ±10 V input route short, minimize area around the input and isolation-barrier region, and use a solid, uninterrupted ground reference on each isolated domain. Do not add a copper path or test-point return that bridges the two sides. Because the verified 50 kHz bandwidth is much higher than many slow process-control signals, input filtering should be deliberate rather than accidental.
Do not substitute a generic isolated amplifier merely because both products are isolation amplifiers. The supplied cross-reference evidence states that an AD210KN has precision references and differential current-loop inputs and is not a direct replacement for the single-ended voltage-sensing ISO122JU/1K. Validate pin functions, input topology, supply arrangement, bandwidth, and isolation rating before approving any replacement. For ISO122U/1K, also verify the manufacturer ordering suffix against the required tape-and-reel configuration.
Информация о соответствии
The supplied product and distributor snippets do not explicitly establish RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The part is an analog isolation amplifier rather than an automotive-qualified AEC-Q100 device in the provided evidence.