ISO122U/1K - Precision 50kHz Isolation Amp | Texas Instruments
MPN: ISO122U/1K ✓ פעילISO122U/1K סקירה
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.
חלופות תחליף ישיר עבור ISO122U/1K — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ISO122U/1K (אותו גורם צורה וטביעת רגל) — שונים ב Package, Product Type.
ISO122U
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ISO122JU
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ISO122U/1K דירוגים מרביים ומאפיינים חשמליים
| 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 |
| מארז | 8-pin SOIC (DVA) |
| סוג הרכבה | Surface mount |
מדריך תצורת פינים של ISO122U/1K 8-pin soic (dva)
תצורת פינים עבור ISO122U/1K (מארזת 8-pin soic (dva)). רכיב אנלוגי זה כולל פיני כניסה, יציאה ואספקת מתח. יש לעיין בגיליון הנתונים של היצרן לתצורות פיני איפוס היסט, פיצוי והפעלה. אידיאלי למעגלי עיצוב אותות ומגברים.
אין נתוני פריסת פינים מפורטים עבור ISO122U/1K.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
ISO122U/1K מתאים עבור 6 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ISO122U/1K — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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 |
מבדילים עיקריים
- High working isolation rating in an 8-pin SOIC (לעומתISO122U)
- Precision transfer characteristic (לעומתISO122JU)
- Direct bipolar voltage sensing (לעומתISO1211DR)
הערות תכנון
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.
מידע על תאימות
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.
