LM2904FJ-E2 - Dual Ground-Sense Op Amp | ROHM | Sensors
MPN： LM2904FJ-E2 ✓ 啟用中LM2904FJ-E2 概覽
A ground-sense operational amplifier is a voltage-feedback amplifier designed for applications where the signal and output can operate near the negative supply rail. Within the broader hierarchy, the LM2904FJ-E2 is an operational amplifier, an analog amplifier IC, and a member of the power-management and signal-conditioning component category. The dual configuration provides two independent amplifier channels in one package, reducing board area in instrumentation and sensor-interface circuits that require more than one amplification stage.
The principal device characteristics are its dual-circuit configuration, 3 V to 32 V single-supply range, low current consumption, and input/output ground-sense operation. The 8-SOP-J construction supports conventional surface-mount assembly. Unlike precision, low-noise amplifier families optimized for very small signals, this device is positioned as a general-purpose ground-sense amplifier for cost-conscious industrial and instrumentation designs.
The LM2904FJ-E2 can be placed in non-inverting or inverting signal-conditioning configurations, subject to the stability, input-range, and output-swing limitations described by the manufacturer datasheet. Its broad supply range permits operation from low-voltage systems or from a 24 V industrial rail when the relevant device and package ratings permit. The dual architecture is useful when a design needs paired gain stages, buffering, or independent channels.
Typical applications include current-sense amplifier interfaces, low-side sensor conditioning, industrial control modules, battery-powered instrumentation, and measurement systems referenced near ground. In each case, the ground-sense characteristic can reduce output-swing constraints that would otherwise limit a conventional amplifier at low signal levels. The exact input and output ranges should be checked against the operating voltage before finalizing the signal chain.
PCB design should preserve the manufacturer's recommended bypass capacitance and account for the common-mode and output-swing limits of the selected operating point. Input and output routing should be short, with the ground reference returned cleanly to the device ground pin. Breadboard or long-trace layouts can introduce coupling and stability problems that do not appear in compact, well-decoupled production layouts.
This page combines the confirmed device identity, electrical characteristics, package information, application guidance, sourcing workflow, and engineering checks for LM2904FJ-E2. It is intended to help engineers determine whether the dual ground-sense topology fits a specific PCB before ordering, while clearly separating confirmed specifications from values that must be confirmed in the manufacturer datasheet.
直接替換替代品，適用於 LM2904FJ-E2 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品LM2904FJ-E2 最大額定值與電氣特性
| Product Type | Dual ground-sense operational amplifier |
| Number of Amplifier Circuits | 2 circuits |
| Single-Supply Operating Voltage Range | 3 V to 32 V |
| Input Ground Sense | Supported |
| Output Ground Sense | Supported |
| 封裝 | 8-SOP-J |
| 安裝類型 | Surface Mount |
LM2904FJ-E2 8-sop-j 腳位配置指南
LM2904FJ-E2（8-sop-j 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM2904FJ-E2.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM2904FJ-E2 適用於 6 應用s: Low-Side Current-Sense Amplifier, Industrial Sensor Signal Conditioning, Battery-Powered Measurement Module, Precision Measurement Front End, 24 V Industrial Control Interface, Portable Diagnostic Equipment.
Low-Side Current-Sense Amplifier
The LM2904FJ-E2 fits a low-side current-sense interface that measures a small shunt voltage relative to ground. Its dual ground-sense operational-amplifier design supports signal paths close to the lower supply rail, while the 3 V to 32 V single-supply range covers low-voltage electronics and 24 V industrial systems. Two amplifier channels can be used for gain stages, filtering, or separate measurements when the board area is constrained. Confirm the common-mode input range, output swing, gain-bandwidth limit, and stability requirements for the selected shunt and gain before production release.
Industrial Sensor Signal Conditioning
The LM2904FJ-E2 is suitable for conditioning sensors whose output lies near the lower end of the measurement range. Input/output ground-sense operation can improve usable signal range compared with an amplifier that cannot approach the lower rail, and the low current consumption supports compact instrumentation. The dual package provides two channels for a complete front end, such as amplification followed by filtering. The engineer should verify supply compatibility, input bias behavior, offset requirements, and the exact output voltage needed by the downstream ADC before finalizing the circuit.
Battery-Powered Measurement Module
A battery-powered measurement module can use the LM2904FJ-E2 where low current consumption and a 3 V to 32 V single-supply operating range are important. The device provides two amplifier channels for current, temperature, or pressure signals without requiring two separate packages. Ground-sense behavior is useful when sensing small changes around the system ground reference, particularly in portable industrial or diagnostic equipment. Because the LM2904FJ-E2 is not characterized here as a precision or rail-to-rail amplifier, validate offset, noise, common-mode range, and output swing against the measurement accuracy required by the instrument.
Precision Measurement Front End
The LM2904FJ-E2 can form part of a measurement front end when the sensed voltage is close to ground and two signal channels are required. Its dual ground-sense architecture helps preserve signal integrity at low input levels, while the 3 V to 32 V supply range allows operation across multiple industrial voltage plans. A practical implementation may use one channel for gain and the other for filtering or another input. Confirm that the required gain, bandwidth, slew rate, and output common-mode behavior meet the system specifications before treating it as a drop-in choice for a precision signal chain.
24 V Industrial Control Interface
The LM2904FJ-E2 is applicable to 24 V industrial control modules that require signal conditioning close to ground. Its single-supply capability extends to 32 V, providing useful input-voltage headroom for 24 V systems, and its dual-circuit package simplifies multi-channel interface design. Ground-sense inputs and outputs can be advantageous when the control circuit processes small sensor signals referenced to the same ground as high-voltage equipment. Validate the actual operating voltage, transient environment, input range, output swing, and thermal performance at the system's worst-case conditions before deployment.
Portable Diagnostic Equipment
The LM2904FJ-E2 supports portable diagnostic equipment that combines low power consumption, a dual-channel amplifier, and signal operation near ground. These traits are useful in compact devices that acquire low-level sensor information and then condition it for conversion or processing. The 3 V to 32 V single-supply range also provides flexibility across battery-derived and industrial supply systems. Use the manufacturer datasheet to establish the allowed common-mode range, output swing, electrical limits, and package details, then confirm that the final amplifier and filter network meet the diagnostic accuracy target.
工程參考資料，適用於 LM2904FJ-E2 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Product Type | Dual ground-sense operational amplifier |
| Number of Amplifier Circuits | 2 circuits |
| Single-Supply Operating Voltage Range | 3 V to 32 V |
| Package | 8-SOP-J |
| Brand | ROHM Semiconductor |
| Input Ground Sense | Supported |
| Output Ground Sense | Supported |
主要差異化特點
- Ground-sense operation supports signal paths near the lower supply rail (對比Conventional dual operational amplifier without a ground-sense architecture)
- Dual channels reduce the number of amplifier packages in multi-channel designs (對比Single-channel amplifier used in a two-channel implementation)
- Wide single-supply operating range supports low-voltage and industrial rails (對比Low-voltage-only dual operational amplifier)
設計說明
Confirm the common-mode input range and output swing before finalizing a low-level sensing circuit. The 3 V to 32 V supply rating does not mean every input and output voltage is valid at every supply point. Review the manufacturer recommended operating conditions and design the signal so that both amplifier inputs remain in range and the output does not exceed the allowable swing.
Place the manufacturer-recommended bypass capacitors close to the supply and ground pins, and keep input and output traces short to reduce parasitic coupling. Provide a low-impedance ground return so the ground-sense benefit is not lost through PCB resistance. Check the 8-SOP-J land pattern and pin numbering against the manufacturer package drawing before releasing artwork.
Do not assume that the maximum 32 V supply rating is suitable for every implementation. Assess the actual supply tolerance, transient environment, and maximum operating condition while keeping the device within its manufacturer-specified limits. If the source rail can overshoot, add appropriate protection using a design method compatible with the selected package and signal bandwidth.
Treat the two amplifier channels as separate high-gain paths even though they share one package. Route each feedback network close to its channel, maintain symmetry between input and feedback components, and avoid crossing sensitive input nodes beneath switching or digital return currents. Separate grounding may be unnecessary when the circuit is designed correctly, but sensitive measurement loops should still be compact.
合規資訊
The confirmed product information does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Obtain the current manufacturer declaration before using the device in a regulated application.
