LM2904FV-E2 - Dual Ground-Sense Op Amp, 3-32V | ROHM
部品番号: LM2904FV-E2 ✗ 生産終了LM2904FV-E2 概要
A ground-sense operational amplifier is an analog amplifier optimized for signals near the supply-ground rail. In the broader semiconductor hierarchy, an operational amplifier is a linear amplifier IC used to amplify voltage differences, and a ground-sense amplifier adds input and output common-mode characteristics suited to low-side sensing. It can therefore process small signals without requiring a negative supply rail when the input and output remain within the specified common-mode range.
The LM2904FV-E2 provides two independent amplifier channels, low current consumption, and a wide operating supply range. Its ground-sense architecture supports signal acquisition in circuits where one input is close to 0 V and the other input represents a small voltage change. The 8-pin SSOP-B format also provides a compact surface-mount option for industrial and consumer control equipment. ROHM identifies the LM2904FV family as not recommended for new designs, so the device is primarily appropriate for maintenance, repair, and continuation of an established design.
Internally, the dual amplifier combines two standard operational-amplifier channels with ground-sense capability and a common supply architecture. The two channels can amplify related measurements, such as two halves of a differential signal, or operate independently when each channel has its own feedback network. The wide 3 V to 32 V supply span permits use from low-voltage battery-powered systems through industrial control rails without requiring a separate low-voltage regulator for the amplifier itself.
Typical uses include low-side shunt-current measurement, battery-voltage monitoring, sensor-interface circuits, industrial process controls, and portable test equipment. In a low-side current-sense design, the shunt produces a small voltage proportional to current; the amplifier boosts that differential signal while its ground-sense behavior supports operation near the lower rail. The dual configuration can also provide signal conditioning for paired sensors or implement two independent gain stages.
Designers should verify the exact input and output common-mode limits, output-current capability, input-bias current, offset voltage, and noise specifications against the manufacturer datasheet before fixing gain or bias networks. Input bias-current error can be significant when sensing very low-resistance shunts, so resistor values should be selected to balance bias error against bandwidth and stability. Decoupling capacitors should be placed close to the supply pins, and the unused channel should be configured according to the datasheet rather than left floating.
This product page combines the manufacturer lifecycle status with package, voltage, and application information, while also providing procurement guidance, comparison structure, and practical engineering notes. Those additions help engineers evaluate whether the established LM2904FV-E2 fits a legacy or maintenance design and what electrical and PCB checks are required before substitution.
ドロップイン代替品: LM2904FV-E2 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
この製品に利用可能なドロップイン代替品はありません。
代替品をリクエストLM2904FV-E2 最大定格＆電気的特性
| Amplifier Type | Dual general-purpose operational amplifier |
| Ground-Sense Architecture | Input/output ground-sense operation |
| Number of Channels | 2 circuits |
| Single-Supply Operating Voltage | 3 V to 32 V |
| パッケージ | 8-pin SSOP-B |
| 実装タイプ | Surface mount |
| Current Consumption | Low current consumption |
| Lifecycle Recommendation | Not recommended for new designs |
LM2904FV-E2 8-pin ssop-b ピン配置ガイド
LM2904FV-E2 (8-pin ssop-b パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: LM2904FV-E2.
詳細は データシート をご参照ください。
主な用途
LM2904FV-E2 の用途: 6 件s: Low-Side Shunt Current Sensing, Battery Voltage Monitoring, Industrial Sensor Signal Conditioning, Portable Measurement Equipment, Audio and Communication Interface Circuits, Legacy Control-System Maintenance.
Low-Side Shunt Current Sensing
The LM2904FV-E2 fits low-side shunt sensing because its two channels provide ground-sense operational-amplifier capability and operate from 3 V to 32 V on a single supply. Place one amplifier across a shunt in the return path so the small differential voltage is amplified for an ADC or comparator. The 8-pin SSOP-B package keeps the sensing section compact, while the second channel can condition a reference or monitor another shunt. Check the manufacturer limits for input bias current, offset voltage, common-mode range, and output swing against the shunt value before finalizing the gain.
おすすめ
Battery Voltage Monitoring
The LM2904FV-E2 is appropriate for battery-monitoring circuits that operate near ground and need a wide supply range. Its dual architecture can amplify a divided battery voltage on one channel while the other handles a scaled pack voltage, temperature reference, or current-sense signal. Operation from 3 V to 32 V allows the same amplifier family to serve low-energy and higher-voltage packs. The low current-consumption design is particularly useful in portable equipment, but the input divider, protection network, and ADC interface must be designed around the exact common-mode and accuracy limits stated in the manufacturer datasheet.
おすすめ
Industrial Sensor Signal Conditioning
The LM2904FV-E2 can condition grounded sensor outputs in industrial control equipment because it combines two ground-sense amplifier channels with a 3 V to 32 V supply range. One channel may amplify a temperature or pressure transducer output while the second handles a current signal or diagnostic voltage. Its compact 8-pin SSOP-B package reduces board area compared with separate single amplifiers. Because the family is marked not recommended for new designs, engineers creating new industrial equipment should evaluate modern low-power op amps while preserving this device for established machinery and control cards.
おすすめ
Portable Measurement Equipment
The LM2904FV-E2 suits portable measurement equipment where battery operation, low circuit current, and signal measurement near ground are important. Its dual channels can amplify a sensor bridge or transducer output and a separate voltage reference within one 8-pin package. The 3 V minimum supply permits operation from common low-voltage rails, while the 32 V maximum provides margin for industrial test points and protected inputs. Designers should account for input bias current in high-impedance sensors, confirm output headroom at light and heavy loads, and use the manufacturer recommended decoupling arrangement.
おすすめ
Audio and Communication Interface Circuits
The LM2904FV-E2 can provide low-level amplification in audio and communication interfaces when the signal is referenced to ground and the system does not require rail-to-rail operation. The dual channels can process a pair of related inputs or handle one control signal and one monitor signal. Its low current consumption supports compact powered equipment, and the 8-pin SSOP-B package leaves more board area for signal routing. Audio design must still verify output swing, gain-bandwidth behavior, slew rate, input noise, and channel matching against the manufacturer datasheet before using the device in a new signal path.
おすすめ
Legacy Control-System Maintenance
The LM2904FV-E2 is particularly relevant to maintenance and repair of legacy industrial or consumer control systems that already use the 8-pin SSOP-B footprint. ROHM identifies the LM2904FV family as not recommended for new designs, making it a candidate for sustaining an existing design rather than starting a new platform. The dual ground-sense architecture supports low-level control signals around the ground rail, while the 3 V to 32 V supply range covers many established power rails. Before installation, verify the exact pinout, operating temperature, electrical limits, and required solder-tinning condition from the manufacturer documentation.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LM2904FV-E2 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 |
|---|---|
| Package | 8-pin SSOP-B |
| Brand | ROHM Semiconductor |
| Amplifier Configuration | Dual |
| Architecture | Ground-sense operational amplifier |
| Single-Supply Operating Voltage | 3 V to 32 V |
| Channel Count | 2 circuits |
| Current Consumption | Low current consumption |
| Lifecycle Recommendation | Not recommended for new designs |
| Mounting Type | Surface mount |
| Primary Application | Ground-referenced signal amplification |
主な差別化要因
- Ground-sense operation is the defining functional feature （vs General-purpose LM2904 family variants)
- Two signal channels in a compact surface-mount package （vs Single-channel LM2904 variants)
- Single-supply range supports multiple power-system classes （vs Lower-voltage-only signal-chain amplifiers)
設計ノート
Do not infer a replacement from the LM2904 family name alone. The LM2904FV-E2 uses an 8-pin SSOP-B package, and a valid substitution must match the package dimensions, lead pitch, pin numbering, exposed-thermal-pad arrangement if any, and channel pin assignments. After identifying a candidate, compare supply range, input and output common-mode limits, bias current, offset voltage, output swing, gain-bandwidth product, and slew rate against the manufacturer requirements of the original circuit.
Place the supply bypass capacitor between the amplifier supply pins and ground at the shortest practical route, following the ROHM manufacturer datasheet layout recommendation. Keep the ground return for input, output, and bypass paths close to the relevant device pins to reduce ground-induced error. Because the SSOP-B leads are closely spaced, inspect the selected footprint and pin-one orientation carefully during PCB review, particularly when reusing an older control-board design.
For shunt or high-impedance sensor measurements, calculate the bias-current and offset-voltage contribution at the actual source resistance. Increasing feedback resistance can improve source loading but may increase bias error, noise, and sensitivity to stray capacitance. Select compensation values for the intended closed-loop gain and verify stability using the manufacturer gain-bandwidth and output-capacitance information. The unused channel should be configured according to the datasheet rather than left floating.
The 3 V to 32 V supply range does not mean that every signal can swing across that entire range. Check the input common-mode window and output voltage limits at the actual supply voltage, especially in battery systems where the rail can fall near 3 V. Account for ground-reference offsets, input protection leakage, and load-dependent output current. Use the exact recommended operating limits from the manufacturer datasheet when setting analog signal ranges and protection thresholds.
コンプライアンス情報
ROHM marks the LM2904FV family as not recommended for new designs. No specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status is stated in the verified product information.
