ISO122U/1K - Precision 50kHz Isolation Amp | Texas Instruments
MPN: ISO122U/1K ✓ AktifISO122U/1K Ringkasan
An isolation amplifier is a precision analog signal-conditioning IC that electrically separates an input measurement from its output and ground domains. Within the product hierarchy, the ISO122U/1K is an isolation amplifier, a voltage-sensing signal conditioner, an analog amplifier IC, and ultimately a semiconductor. Its capacitive isolation barrier helps protect personnel and downstream circuitry when monitoring high-voltage process-control signals.
Key specifications include a maximum nonlinearity of 0.020%, input-offset voltage drift of 200 V/°C, and signal bandwidth of 50 kHz. The power supply range is 4.5 V to 18 V, while the verified manufacturer data identifies approximately ±10 V bipolar operation. These characteristics make the ISO122U/1K appropriate for precision voltage sensing, current-shunt measurement, industrial instrumentation, and isolated data acquisition.
Internally, the ISO122U/1K transmits information digitally across the differential capacitive isolation barrier through duty-cycle modulation and demodulation. Although the information crosses the barrier digitally, the external signal remains an analog voltage presented by the isolation amplifier. The 2 pF barrier and 1500 Vrms working isolation rating distinguish it from conventional non-isolated operational amplifiers.
Typical applications include industrial process-control loops, motor-drive monitoring, power-supply feedback isolation, high-voltage sensor interfaces, and isolated measurement systems. The 50 kHz bandwidth is suitable for relatively slow control and instrumentation signals rather than high-frequency communications. In a shunt-measurement circuit, the amplifier can preserve ground separation between a high-side or floating sensor and the controller ground.
Designers should place input and output bypassing capacitors close to their respective supply pins, maintain the isolation barrier clear of conductive PCB features, and verify creepage, clearance, and working-voltage requirements against the completed system. The 50 mV input-offset maximum and 0.020% nonlinearity should also be included in the end-to-end measurement error budget.
This page combines verified manufacturer specifications, distributor availability and pricing references, package information, design guidance, and traceable source links. It distinguishes documented electrical limits from application-level calculations and avoids treating merely similar isolation products as guaranteed drop-in replacements.
Pilihan pengganti yang segera untuk ISO122U/1K — sama paket, pin-pin kompatibel. Bahagian paket yang berbeza memerlukan kerja ulang PCB diasingkan.
Varietas dalam siri ini
Model serupa yang kompatibel dengan pengganti yang segera ISO122U/1K (sama faktor bentuk dan kaki) — berbeza dalam Package, Product Type.
ISO122U
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →ISO122JU
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →ISO122U/1K Penilaian maksimum & Ciri-ciri Elektrik
| Product Type | Precision voltage-sensing isolation amplifier |
| Number of Channels | 1 circuit |
| Input Signal Range | ±10 V |
| Peak-to-Peak Input Voltage Range | 10 V |
| Signal Bandwidth | 50 kHz |
| Maximum Nonlinearity | 0.020% |
| Input Offset Voltage | ±50 mV maximum |
| Input Offset Voltage Drift | 200 V/°C |
| Working Isolation Voltage | 1500 Vrms |
| Isolation Barrier | 2 pF differential capacitive barrier |
| Power Supply Range | 4.5 V to 18 V |
| VS1 Quiescent Current | 5 mA |
| VS2 Quiescent Current | ±5.5 mA |
| Kemasan | 8-pin SOIC (DVA) |
| Jenis Pemasangan | Surface mount |
Panduan Konfigurasi Pin ISO122U/1K 8-pin soic (dva)
Konfigurasi pin untuk ISO122U/1K (8-pin soic (dva) pakai). Komponen analog ini mempunyai pin masukan, keluaran, dan kuasa. Rujuk dokumen pengeluar untuk konfigurasi pengecualian, pemulihan, dan pin aktifkan. Ideal untuk pengawasan isyarat dan litar pengukur.
Tiada data garisan pin yang diperoleh untuk ISO122U/1K.
Rujuk kepada lembaran data untuk konfigurasi pin penuh.
Aplikasi Biasa
ISO122U/1K patut untuk 6 aplikasis: Industrial Process-Control Isolation, High-Voltage Shunt Measurement, Isolated Power-Supply Feedback, Motor-Drive Current Monitoring, High-Voltage Sensor Instrumentation, Isolated Data-Acquisition System.
Industrial Process-Control Isolation
The ISO122U/1K fits isolated process-control inputs that use bipolar voltage signals and require protected separation between a field circuit and the controller. Its ±10 V input range accommodates suitable sensor and shunt outputs, while 0.020% maximum nonlinearity supports precision measurement. The 50 kHz bandwidth is suitable for many closed-loop control and monitoring signals. Place the amplifier between the protected input domain and the grounded controller, provide bypassing on both supply domains, and preserve the isolation barrier with adequate creepage and clearance.
Disebarkan
High-Voltage Shunt Measurement
The ISO122U/1K is appropriate for measuring the voltage across a current shunt when the shunt is near a high-voltage or floating node. Its ±10 V input range provides a practical interface for common bipolar shunt amplifiers, and the specified 50 mV maximum offset and 0.020% maximum nonlinearity should be included in the measurement error budget. The 1500 Vrms working isolation rating separates the measurement domain from the electronics ground. A differential input arrangement and carefully placed return connections are essential for accurate current measurement.
Disebarkan
Isolated Power-Supply Feedback
The ISO122U/1K can transfer a power-converter control or feedback voltage across a boundary where galvanic separation is required. Its 50 kHz bandwidth is suitable for many voltage-mode control loops, while the 0.020% maximum nonlinearity helps preserve feedback accuracy. The 1500 Vrms working isolation rating allows the feedback amplifier to bridge primary and secondary circuitry when the overall design and PCB satisfy applicable separation requirements. Designers must account for offset and drift rather than attributing all measurement error to the power converter.
Disebarkan
Motor-Drive Current Monitoring
The ISO122U/1K supports isolated current or voltage monitoring in motor-drive systems by transferring a bipolar analog measurement across the high-side barrier. Its ±10 V input range works with appropriately scaled shunt signals, and the 50 kHz bandwidth is adequate for many current-control and protection loops. The isolation barrier helps keep the controller away from switching-node voltages. The design must use Kelvin-style measurement routing, short differential traces, adequate bypassing, and barrier clearances suitable for the motor-drive voltage environment.
Disebarkan
High-Voltage Sensor Instrumentation
The ISO122U/1K is useful when a voltage sensor operates in a high-voltage or floating domain and its analog output must reach low-voltage instrumentation. The ±10 V input range supports appropriately conditioned sensor outputs, while 0.020% maximum nonlinearity preserves measurement fidelity. The 50 kHz bandwidth covers many temperature, pressure, and position sensor systems without introducing substantial conversion delay. Front-end protection should limit surge and fault energy before the amplifier, and the PCB isolation zone must remain free of copper, solder, and conductive contamination.
Disebarkan
Isolated Data-Acquisition System
The ISO122U/1K can condition analog sensor channels before they enter an isolated data-acquisition front end. Its 50 kHz bandwidth supports measurement channels whose signal bandwidth remains well below that limit, and the 0.020% maximum nonlinearity is favorable for calibration. The 1500 Vrms working isolation rating provides a substantial separation boundary between measured equipment and downstream electronics. For multichannel systems, pay attention to channel-to-channel grounding, common-mode voltage, connector isolation, and consistent bypass placement because those system-level factors can dominate total measurement accuracy.
Disebarkan
Ringkasan Produk Disebarkan
Data referensi kejuruteraan untuk ISO122U/1K — perbandingan, panduan rancangan, dan maklumat kesediaan
Panduan Pilihan
Perbandingan dengan Gantian
| Parametr | Produk Ini | ISO122U | ISO122JU |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC (DVA) | 8-pin SOIC (DVA) | 8-pin SOIC (DVA) |
| Product Type | Precision voltage-sensing isolation amplifier | ISO122 voltage-sensing isolation amplifier | ISO122 voltage-sensing isolation amplifier |
| Input Signal Range | ±10 V | ±10 V | ±10 V |
| Peak-to-Peak Input Range | 10 V | 10 V | 10 V |
| Signal Bandwidth | 50 kHz | 50 kHz | 50 kHz |
| Working Isolation Voltage | 1500 Vrms | 1500 Vrms | 1500 Vrms |
| Maximum Nonlinearity | 0.020% | 0.020% | 0.020% |
| Power Supply Range | 4.5 V to 18 V | 4.5 V to 18 V | 4.5 V to 18 V |
| Isolation Barrier | 2 pF differential capacitive barrier | 2 pF differential capacitive barrier | 2 pF differential capacitive barrier |
Penyeberangsung Jelas
- High working isolation rating in an 8-pin SOIC (vsISO122U)
- Precision transfer characteristic (vsISO122JU)
- Direct bipolar voltage sensing (vsISO1211DR)
Catatan Desain
Keep the isolation barrier free of copper pours, ground planes, test points, conductive coatings, and nearby high-voltage traces. The manufacturer data identifies a 2 pF differential capacitive barrier, so parasitic coupling from either side can affect accuracy and EMI performance. Route the two barrier-related connections according to the manufacturer recommended layout and preserve the specified creepage and clearance for the complete working voltage. Do not treat the SOIC body outline alone as proof that the assembled PCB satisfies isolation requirements.
Provide local high-frequency bypass capacitance at VS1 and VS2, with the capacitor and grounding arrangement selected using the manufacturer guidance for the ISO122 family. The documented supply range is 4.5 V to 18 V, and quiescent current is 5 mA on VS1 and ±5.5 mA on VS2. Keep the isolated-side and output-side return paths separate. Verify startup behavior, supply sequencing, and the voltage at every device pin during fault conditions rather than assuming all supplies rise together.
Treat the ISO122U/1K input as a precision analog measurement node. Route input traces away from switching nodes and use a symmetric, tightly matched input layout where practical. The 50 kHz bandwidth is adequate for many instrumentation signals but does not make the device immune to high-frequency interference. Include the ±50 mV maximum input offset, 200 V/°C drift, and 0.020% maximum nonlinearity in calibration and error-budget calculations.
Do not substitute the ISO1211DR, AD202-series devices, or HCPL-7800-series devices as direct replacements merely because they provide isolation. The verified evidence does not establish identical pin assignments, packages, input ranges, supply requirements, or output transfer functions. For the listed same-family alternatives, confirm the complete orderable-device table and marking information. For cross-brand products, treat substitution as a redesign and review isolation, bandwidth, accuracy, safety, and layout requirements from scratch.
Maklumat Kesediaan
The supplied manufacturer and distributor excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred.
