ISO122JUE4 - 50 kHz Precision Isolation Amp | Texas Instruments
Teilenummer: ISO122JUE4 ✓ AktivISO122JUE4 Übersicht
An isolation amplifier is a specialized amplifier that transfers a low-level analog measurement across a galvanic-isolated barrier while minimizing electrical coupling between the sensed side and the output side. Within the signal-chain hierarchy, the ISO122 belongs to the amplifier family and provides signal conditioning plus reinforced isolation for industrial, medical, and test equipment. Its digital transmission across the capacitive barrier reduces sensitivity to barrier-characteristic changes and improves high-frequency transient immunity.
Key features include a maximum nonlinearity of 0.020%, a 50 kHz signal bandwidth, and a 200 V/°C input-offset-voltage drift specification. The power-supply range is 4.5 V to 18 V, with a reported quiescent current of 5 mA on VS1 and ±5.5 mA on VS2. The single-ended input architecture simplifies measurement interfaces where a differential source is not available, while the 8-SOIC format supports compact surface-mount construction.
Internally, the ISO122 converts the analog input into a duty-cycle-modulated signal and demodulates it on the output side. The signal therefore crosses the isolation barrier digitally rather than as a continuously varying analog voltage. The verified product information identifies a 2 pF differential capacitive barrier, and a Partstack listing reports a maximum common-mode voltage of 1500 V. Designers must still verify the complete isolation rating, package details, creepage, clearance, and certification requirements against the current manufacturer documentation before applying the device to a safety-critical interface.
Typical applications include industrial sensor isolation, current-shunt measurement, high-voltage sensing interfaces, test and measurement equipment, and isolated process-control inputs. The 50 kHz bandwidth is appropriate for relatively low-frequency process signals rather than high-speed data acquisition. The 4.5 V to 18 V supply range also permits operation from common laboratory and industrial rails, although each isolated side must be powered independently according to the manufacturer application guidance.
When designing around the ISO122JUE4, treat the barrier capacitance, input common-mode range, supply arrangement, and isolation return path as system-level constraints. Confirm that the selected protection network does not introduce unacceptable input impedance or gain error, and place the supply-return and output-reference layout according to the manufacturer guidance. The 50 kHz bandwidth and 0.020% maximum nonlinearity should be included in the complete error budget rather than treating the isolation amplifier as an ideal gain stage.
Drop-in-Alternativen für ISO122JUE4 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ISO122JUE4 (gleiche Bauform und Footprint) – abweichend in Isolation Method, Maximum Nonlinearity, Package, Product Type, VS1 Quiescent Current.
ISO124U
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →ISO122JUE4 Grenzwerte & elektrische Eigenschaften
| Product Type | Single-circuit precision isolation amplifier |
| Input Architecture | Single-ended analog input |
| Maximum Nonlinearity | 0.020% |
| Signal Bandwidth | 50 kHz |
| 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 |
| Differential Capacitive Barrier | 2 pF |
| Maximum Common-Mode Voltage | 1500 V |
| Maximum Analog Input Voltage | 10 V |
| Isolation Method | Duty-cycle modulation and demodulation across a capacitive barrier |
| Gehäuse | 8-SOIC |
| Terminal Count | 8 terminals |
| Montageart | Surface mount |
ISO122JUE4 8-soic Pinbelegungsleitfaden
Pinbelegung für ISO122JUE4 (8-soic-Gehäuse). Dieses analoge Bauteil verfügt über Eingangs-, Ausgangs- und Versorgungspins. Offset-Null-, Kompensations- und Enable-Pin-Konfigurationen entnehmen Sie dem Herstellerdatenblatt. Ideal für Signalaufbereitung und Verstärkerschaltungen.
Keine detaillierten Pinbelegungsdaten verfügbar für ISO122JUE4.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
ISO122JUE4 ist geeignet für 6 Anwendungs: Industrial Current-Shunt Measurement, High-Voltage Sensing Interface, Test and Measurement Equipment, Isolated Process-Control Input, Medical Equipment Signal Isolation, Data Acquisition and Sensor Interface.
Industrial Current-Shunt Measurement
The ISO122JUE4 fits industrial shunt monitoring because it combines a single-ended input architecture with 0.020% maximum nonlinearity and a 50 kHz signal bandwidth. The amplifier can condition a low-level voltage proportional to current before transferring it across the 2 pF differential capacitive barrier to a protected controller domain. Its 4.5 V to 18 V supply range supports common industrial rails, while the 5 mA VS1 and ±5.5 mA VS2 quiescent currents simplify power budgeting. The shunt bandwidth, isolation capacitance, input protection, and common-mode transient energy must be included in a complete system surge design.
Empfohlen
High-Voltage Sensing Interface
The ISO122JUE4 is appropriate for a high-voltage sensing interface that requires the measurement to be electrically separated from a low-voltage controller. A Partstack listing reports a 1500 V maximum common-mode voltage for this family, while the Texas Instruments product information identifies a 2 pF differential capacitive barrier and duty-cycle modulation architecture. The verified 50 kHz bandwidth suits power-frequency and slowly changing voltage measurements. Creepage, clearance, input protection, insulation coordination, and the complete isolation qualification must be confirmed from current manufacturer documentation rather than inferred from the package outline.
Empfohlen
Test and Measurement Equipment
The ISO122JUE4 can isolate analog inputs in test and measurement equipment while preserving a useful 50 kHz signal bandwidth and 0.020% maximum nonlinearity. Its single-ended input simplifies instrumentation channels driven from a common-referenced sensor or attenuator. The device transfers the measurement across a capacitive isolation barrier using duty-cycle modulation and demodulation, reducing direct analog coupling between the source and instrument domains. Designers should budget 4.5 V to 18 V supply compatibility, account for the specified 5 mA and ±5.5 mA quiescent currents, and verify calibration stability rather than assuming the full amplifier error is only nonlinearity.
Empfohlen
Isolated Process-Control Input
The ISO122JUE4 supports isolated process-control inputs where a field sensor produces a single-ended voltage and the controller must remain separated from the measured process. Its 50 kHz bandwidth is more than adequate for many temperature, pressure, and position signals, while the 0.020% maximum nonlinearity helps preserve measurement fidelity. The 4.5 V to 18 V operating range allows integration with established supply rails, but both isolated domains require correct grounding and decoupling. Input filtering, surge protection, diagnostic behavior, and the final safety case must be validated as a complete interface.
Empfohlen
Medical Equipment Signal Isolation
The ISO122JUE4 may be evaluated for low-frequency medical equipment signal paths that require an isolated measurement interface, particularly where the source is single-ended and the required bandwidth is well below 50 kHz. The Texas Instruments architecture transmits a digitally modulated representation across a 2 pF differential capacitive barrier, which supports isolation and transient-immunity objectives. However, the supplied web data does not establish medical certification, maximum working voltage, or reinforced-insulation suitability. Those requirements must be verified in the current datasheet and applicable certification documentation before use in patient-connected equipment.
Empfohlen
Data Acquisition and Sensor Interface
The ISO122JUE4 can serve as the isolated front end of a moderate-speed sensor or data-acquisition channel because its 50 kHz bandwidth accommodates many slowly changing sensor signals and its 0.020% maximum nonlinearity limits amplitude-transfer error. The single-ended input reduces the need for a differential source, and the capacitive isolation barrier helps prevent ground-potential problems between the sensor and acquisition hardware. The designer should establish the complete input-referred error, including 200 V/°C offset drift, and confirm that the selected bandwidth does not introduce excessive noise or settling time for the acquisition sequence.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ISO122JUE4 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ISO124U |
|---|---|---|
| Package | 8-SOIC | 8-SOIC - same package family |
| Brand | Texas Instruments | Texas Instruments |
| Product Type | Precision isolation amplifier | Precision low-cost isolation amplifier |
| Input Architecture | Single-ended | Differential-input isolation amplifier |
| Signal Bandwidth | 50 kHz | 50 kHz-class isolation amplifier performance |
| Isolation Architecture | Duty-cycle modulation and demodulation across a capacitive barrier | Duty-cycle modulation and demodulation across a capacitive barrier |
Wichtigste Unterscheidungsmerkmale
- Single-ended input simplifies the source interface (vs. ISO124U)
- Verified precision and bandwidth targets (vs. ISO124U)
- Duty-cycle-modulated capacitive isolation (vs. ISO124U)
Designhinweise
Treat the isolated input, isolated output, and their returns as separate circuit domains. Route the barrier and isolation-side copper according to the current TI isolation-layout guidance, keep input and output copper apart as far as practical, and provide the specified supply bypassing on each side. The verified material does not include exact terminal names or capacitor values, so PCB implementation must use the manufacturer pinout and recommended schematic rather than values inferred from general isolation-amplifier practice.
Include the ISO122's 0.020% maximum nonlinearity and 200 V/°C input-offset-voltage drift in the complete measurement error budget. The 50 kHz bandwidth indicates suitability for many low-frequency sensor signals, but the actual settling time and usable bandwidth also depend on the source impedance, protection network, isolation capacitance, and output filter. Measure the full transfer function after adding input protection so that leakage, capacitance, and filtering do not consume the available precision margin.
Power VS1 and VS2 independently within their documented operating arrangement and include the reported 5 mA VS1 and ±5.5 mA VS2 quiescent currents in each domain's budget. Do not assume the two isolated supplies share a common ground. Because the verified data does not provide complete bypass capacitance, output loading, or quiescent-current conditions, use the current manufacturer application circuit for the selected supply polarity and operating range.
Do not treat the ISO124U name as proof that it can replace the ISO122JUE4 without a schematic and pinout review. The closest identified alternative differs in input arrangement, and the verified cross-reference results do not explicitly establish pin-to-pin equivalence. Review the gain equation, input common-mode range, output reference, supply pins, package dimensions, isolation rating, and intended electrical performance before approving a substitution or reusing a PCB.
Compliance-Informationen
The supplied verified results do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations for ISO122JUE4. Obtain current compliance and qualification documentation from Texas Instruments before production release.
