OPA234U - Dual 350kHz Precision Op Amp | Texas Instruments
Артикул: OPA234U ✓ АктивенOPA234U Обзор
An operational amplifier is an analog integrated circuit that amplifies the voltage difference between its non-inverting and inverting inputs. In the broader semiconductor hierarchy, the OPA234U belongs to the operational-amplifier, analog-amplifier, and analog IC families. Its low-dropout internal design also allows operation from low-voltage supplies, while its broad supply range provides flexibility in instrumentation, industrial control, and portable equipment.
Key features include two precision amplifiers per package, a 350 kHz gain-bandwidth product, 250 µA of quiescent current per amplifier, and guaranteed performance at 2.7 V, 5 V, and ±15 V supplies. Low input offset voltage supports accurate closed-loop gain, while common-mode rejection and power-supply rejection reduce errors caused by unwanted signals. The SOIC-8 package simplifies assembly and provides a practical option where a surface-mount dual amplifier is required.
OPA234U combines a conventional precision amplifier architecture with low quiescent-current operation. Its gain-bandwidth product supports signal bandwidths in instrumentation and sensor-conditioning systems, although it is not intended for high-speed video or communications paths. Low input offset voltage is particularly valuable in sensor amplifiers, current-to-voltage converters, and error-amplifier configurations where the difference between two input voltages is small and must be amplified accurately.
Typical applications include low-power sensor signal conditioning, precision current measurement, industrial process instrumentation, portable battery-powered equipment, and low-voltage control systems. The dual configuration also allows one package to implement two related amplifier stages, reducing board area and simplifying designs that use matched functions such as differential input and feedback networks.
Designers should verify the input common-mode range and output swing against the actual supply voltage before finalizing a circuit. Decoupling capacitors should be placed close to the supply pins, and unused amplifier inputs must be biased so they remain within the valid common-mode range. Stability with capacitive loads and the required noise performance should be verified using the manufacturer datasheet typical curves.
Аналоги без доработки для OPA234U — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Для этого товара нет аналогов без доработки.
Запросить аналогиOPA234U Максимальные параметры и электрические характеристики
| Number of Amplifiers | 2 amplifiers |
| Amplifier Type | 1 circuit, low-power precision operational amplifier |
| Gain-Bandwidth Product | 350 kHz |
| Single-Supply Operating Range | 2.7 V to 36 V |
| Dual-Supply Operating Range | ±18 V |
| Guaranteed Performance Supply Points | 2.7 V, 5 V, and ±15 V |
| Ток покоя | 250 µA per amplifier |
| Корпус | 8-pin SOIC |
| Тип монтажа | Surface mount |
Конфигурация выводов OPA234U
| Контакт 1 | OUTA — Output of amplifier A |
| Контакт 2 | IN A- — Inverting input of amplifier A |
| Контакт 3 | IN A+ — Non-inverting input of amplifier A |
| Контакт 4 | V- — Negative supply connection |
| Контакт 5 | IN B+ — Non-inverting input of amplifier B |
| Контакт 6 | IN B- — Inverting input of amplifier B |
| Контакт 7 | OUTB — Output of amplifier B |
| Контакт 8 | V+ — Positive supply connection |
Типичное применение
OPA234U подходит для 6 применениеs: Low-Power Sensor Signal Conditioning, Precision Current Measurement, Portable Battery-Powered Instrumentation, Industrial Process Control, Precision Active Filtering, Audio and Communication Buffering.
Low-Power Sensor Signal Conditioning
The OPA234U is well suited to conditioning weak sensor signals because each amplifier provides low input offset voltage, high common-mode rejection, and a 350 kHz gain-bandwidth product while consuming only 250 µA at quiescent conditions. Place the device close to the sensor interface and use its two amplifier channels for stages such as a non-inverting preamplifier and an active filter. The 2.7 V minimum supply supports portable systems, while the 36 V maximum supports higher-voltage industrial interfaces. Before finalizing, verify that the sensor’s common-mode voltage and the amplifier output remain inside the datasheet limits, and confirm stability if the source presents appreciable capacitance.
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Precision Current Measurement
The OPA234U can provide accurate current-to-voltage amplification for sensors whose output is a small differential or bipolar current signal. Its low offset voltage reduces measurement error near zero, while the high common-mode rejection and power-supply rejection improve rejection of disturbances on the measured rail. The 350 kHz gain-bandwidth product accommodates instrumentation bandwidth generally associated with slow industrial and laboratory measurements. Use one channel for signal amplification and the other for gain-setting, monitoring, or filtering, and confirm the maximum input voltage, output swing, and input bias current against the manufacturer datasheet before committing the circuit.
Рекомендуется
Portable Battery-Powered Instrumentation
The OPA234U suits portable instrumentation because its quiescent current is only 250 µA per amplifier and the device operates from 2.7 V, allowing efficient operation close to common low-voltage battery rails. Two precision amplifiers are available in one 8-SOIC package, reducing the component count for gain, filtering, and buffer functions. Performance is guaranteed at 2.7 V and 5 V supply conditions according to the Texas Instruments OPA234 datasheet. The principal trade-off is its 350 kHz gain-bandwidth product, which is appropriate for measurement signals rather than high-speed waveform processing.
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Industrial Process Control
OPA234U can serve as the precision input stage in an industrial process-control module handling low-level sensor signals. Low offset voltage supports accurate error amplification, while high common-mode and power-supply rejection help suppress interference from control rails and field wiring. The 8-SOIC package is practical for automated assembly, and the 2.7 V to 36 V supply range supports both compact electronics and higher-voltage interface stages. The device is not an isolated interface, so the complete design must address grounding, surge exposure, input protection, and safety requirements outside the amplifier itself.
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Precision Active Filtering
The OPA234U is suitable for active low-pass or band-pass filters when the signal bandwidth is compatible with its 350 kHz gain-bandwidth product. Its low offset voltage and high rejection characteristics help preserve accuracy in low-level filtering stages, while the dual package permits two linked filter sections. At 2.7 V or 5 V, component tolerances and the amplifier’s operating characteristics must be included in the response calculation. Use the manufacturer’s typical phase and gain information, check noise gain at each stage, and avoid treating the gain-bandwidth product as a guaranteed high-Q filter bandwidth.
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Audio and Communication Buffering
OPA234U can buffer modest-frequency audio or communications signals when low offset, low power, and supply flexibility are more important than wideband performance. Its dual configuration supports separate input and output buffering paths, while low quiescent current benefits compact systems. The 350 kHz gain-bandwidth product limits the bandwidth available to large closed-loop gains, so high-Q audio filters or higher-frequency signal paths require careful stability analysis. According to the Texas Instruments OPA234 datasheet, the device is intended primarily as a precision general-purpose amplifier rather than a high-speed line driver.
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Сводка рекомендуемых товаров
Справочные инженерные данные для OPA234U — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар |
|---|---|
| Brand | Texas Instruments |
| Package | 8-pin SOIC |
| Number of Amplifiers | 2 amplifiers |
| Gain-Bandwidth Product | 350 kHz |
| Single-Supply Operating Range | 2.7 V to 36 V |
| Dual-Supply Operating Range | ±18 V |
| Quiescent Current | 250 µA per amplifier |
| Amplifier Classification | Low-power precision operational amplifier |
Ключевые отличия
- Combines two precision amplifiers with low quiescent current in one package (против OPA234P)
- Supports low-voltage and higher-voltage supply systems (против OPA2344PA)
- Precision-oriented 350 kHz dual-amplifier solution (против OPA2344PA)
Заметки по проектированию
Place the OPA234U close to the signal source and place its supply-bypass capacitors directly between the supply pins and ground. Keep the two amplifier outputs and high-impedance input nodes away from switching nodes and fast digital traces. The 8-SOIC footprint permits a compact layout, but the exposed package leads still require adequate copper and soldering time for reliable electrical and thermal contact.
Verify the input common-mode range and output swing at the actual supply voltage; the 2.7 V to 36 V headline range does not mean every input or output level is valid on every rail. Bias or terminate unused amplifier inputs so they remain in a legal operating state. Also check the maximum input differential voltage during power transitions to avoid damage to the input protection structures.
OPA234U has a 350 kHz gain-bandwidth product, so closed-loop bandwidth decreases as requested gain increases. Use the manufacturer’s gain-bandwidth, phase, and capacitive-load information to select a stable noise gain. If driving cables, sensors, or ADC inputs with appreciable capacitance, check the small-signal overshoot-versus-load-capacitance curve and add isolation resistance if required rather than assuming the amplifier can drive every load directly.
Estimated: at a 5 V supply and 500 µA total quiescent current, the ideal quiescent supply consumption is 2.5 mW. Actual dissipation and battery life will be higher when the outputs drive load current, so calculate the complete analog signal-path power budget rather than relying only on the 250 µA-per-amplifier figure. Ensure the supply source also meets the amplifier’s dynamic output-current and stability requirements.
Информация о соответствии
The supplied verified data identifies the OPA234U as a Texas Instruments 8-SOIC operational amplifier but does not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. No compliance status was inferred.