LT1057SW - Dual Precision JFET Op Amp | Analog Devices
部品番号: LT1057SW ✓ 生産中LT1057SW 概要
A JFET-input operational amplifier is an analog signal-conditioning IC that uses junction-field-effect-transistor input devices to provide very low input bias current. This places the LT1057SW in the amplifier hierarchy of JFET amplifier, operational amplifier, analog IC, and semiconductor. Unlike a bipolar-input amplifier, a JFET input stage can combine low bias current with high input impedance, making the device useful when measuring signals from high-impedance sources.
According to the Analog Devices product page and LT1057/LT1058 datasheet, the LT1057 is a matched dual amplifier designed to replace popular bipolar and JFET-input dual op amps. The manufacturer specifically identifies upgrades for systems using the LF412A and OP-215. Clear electrical benefits include a 5 MHz minimum gain-bandwidth product, a 10 V/µs minimum slew rate, and a typical 13 V/µs slew rate in the LT1057SW ordering information.
The dual configuration provides two amplifiers in one package, reducing board area compared with two separate single amplifiers. A reported common-mode rejection figure of 96 dB helps suppress differential input offsets and common-mode disturbances. The SW ordering option is associated with a 16-lead SO package and a specified 0°C to 70°C operating-temperature range; higher-temperature and packaging options should be confirmed by part suffix before substitution.
Typical applications include precision signal conditioning, low-frequency instrumentation, active filtering, data acquisition, current-to-voltage conversion, and buffered sensor interfaces. The LT1057SW is particularly appropriate when a source presents high impedance and the input stage must minimize bias-current error while preserving useful slew rate and bandwidth.
Layout should keep sensitive input nodes short, provide a solid ground reference, and place input and feedback components close to the relevant amplifier pins. Confirm the required supply voltage, output-swing limits, input-common-mode range, unity-gain stability, and exact lead assignments in the manufacturer datasheet before finalizing a new layout.
This page organizes the manufacturer specifications, sourcing guidance, qualified drop-in analysis, application guidance, and design checks for engineers evaluating the LT1057SW. It also separates confirmed technical facts from parameters that require schematic-level verification, helping accelerate component selection without replacing careful datasheet review.
ドロップイン代替品: LT1057SW — 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LT1057SW 最大定格＆電気的特性
| Amplifier Type | Dual precision operational amplifier |
| Input Transistor Type | JFET |
| Number of Channels | 2 channels |
| Gain-Bandwidth Product | 5 MHz minimum |
| Slew Rate | 10 V/µs minimum |
| Typical Slew Rate | 13 V/µs |
| Input Offset Voltage | 300 µV |
| Common-Mode Rejection Ratio | 96 dB |
| Input Bias Current | 0.10 µA |
| Supply Voltage for LT1057SW#TR | 15 V |
| Supply Voltage Range | 20 V to 36 V |
| 動作温度 | 0°C to 70°C |
| パッケージ | 16-lead SOIC |
| 実装タイプ | Surface mount |
| Configuration | Matched dual amplifier |
LT1057SW 16-lead soic ピン配置ガイド
LT1057SW (16-lead soic 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: LT1057SW.
詳細は データシート をご参照ください。
主な用途
LT1057SW の用途: 6 件s: Precision Instrumentation Amplifier, High-Impedance Sensor Buffer, Active Audio Filter, Data Acquisition Front End, Precision Current-to-Voltage Conversion, Industrial Control Signal Conditioning.
Precision Instrumentation Amplifier
The LT1057SW fits precision instrumentation front ends that combine high source impedance with moderate signal bandwidth. Its JFET input stage limits bias-current error, with the LT1057SW#TR ordering information listing 0.10 µA input bias current, while the 5 MHz minimum gain-bandwidth product supports useful closed-loop bandwidth in amplifier configurations. Two matched channels can support gain, filtering, or buffering stages while keeping the board compact. The 16-lead SO package simplifies surface-mount assembly, although output swing, input common-mode range, and supply limits must be checked against the actual instrumentation front-end signal range.
おすすめ
High-Impedance Sensor Buffer
The LT1057SW is appropriate for buffering sensor outputs where input bias current can create measurement errors. A JFET input minimizes current drawn from the sensed source, while the 10 V/µs minimum and 13 V/µs typical slew rates allow the buffer to follow changing signals more effectively than a slow precision-only amplifier. The 96 dB common-mode rejection figure also helps reduce errors from common-mode voltage present at the sensor interface. Use guarding and careful grounding because high-impedance nodes amplify leakage and capacitance effects, and verify the sensor output remains inside the amplifier input common-mode range.
おすすめ
Active Audio Filter
The LT1057SW can implement active filters and audio preamplifier stages requiring more bandwidth than a conventional precision amplifier provides. Its minimum 5 MHz gain-bandwidth product and minimum 10 V/µs slew rate reduce distortion risk in filters with moderate-Q sections and low-frequency audio signals. Two amplifiers in one 16-lead SOIC allow compact dual-stage filter or dual-channel preamplifier layouts. Confirm output voltage swing at the selected supply voltage, maintain adequate phase margin, and place feedback components close to the device to minimize parasitic capacitance that could alter filter response.
おすすめ
Data Acquisition Front End
The LT1057SW is suitable for conditioning analog inputs ahead of data-conversion systems, particularly when the source is not low impedance. Low JFET bias current helps preserve sensor accuracy, while 5 MHz minimum gain-bandwidth product leaves adequate bandwidth for many sensor-bandwidth signals. The dual amplifier arrangement can implement differential or single-ended conditioning stages, including gain and filtering functions. The design should include input protection, common-mode-range checks, and careful routing away from digital switching nodes so that high-impedance inputs do not collect unwanted coupling or leakage-induced errors.
おすすめ
Precision Current-to-Voltage Conversion
The LT1057SW can support current-to-voltage conversion when the source current and feedback network are designed around the amplifier input characteristics. JFET inputs reduce the bias-current contribution to the conversion error, while the high slew rate helps the amplifier drive the feedback network and downstream load without compromising small-signal settling. A 5 MHz minimum gain-bandwidth product also supports practical closed-loop bandwidth for many instrumentation channels. Keep the summing node physically compact, use suitable resistor accuracy, and verify output compliance because the converted signal must remain within the amplifier output-swing limits.
おすすめ
Industrial Control Signal Conditioning
The LT1057SW is suitable for industrial control modules that condition sensor, transducer, or low-level command signals close to the acquisition circuitry. Its JFET-input architecture supports high-impedance sources, while the specified 10 V/µs minimum slew rate and 5 MHz minimum gain-bandwidth product provide a useful balance between speed and precision. The 0°C to 70°C range associated with the LT1057SW#TR ordering information fits many commercial industrial environments, but deployments beyond that range require a different temperature-grade option. Robust designs should include input clamping, power sequencing, grounding, and protection against external transients.
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: LT1057SW — 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 |
|---|---|
| Brand | Analog Devices |
| Package | 16-lead SOIC |
| Amplifier Configuration | Dual |
| Input Stage | JFET |
| Gain-Bandwidth Product | 5 MHz minimum |
| Slew Rate | 10 V/µs minimum; 13 V/µs typical |
| Input Offset Voltage | 300 µV |
| Input Bias Current | 0.10 µA |
| Common-Mode Rejection Ratio | 96 dB |
| Operating Temperature | 0°C to 70°C for LT1057SW#TR |
主な差別化要因
- Matched dual JFET input stage in one package （vs LF412A)
- Higher specified performance for upgraded precision designs （vs OP-215)
- Dual-channel integration reduces board area （vs Two discrete single amplifiers)
設計ノート
Keep each high-impedance input node short and minimize the area of exposed copper around it. Connect the two amplifier channels to nearby ground and decoupling structures, and route feedback components directly between their corresponding pins. For guarded inputs, use a continuous guard ring tied to the amplifier's inverting-input potential where appropriate; leakage across the guard is substantially smaller than leakage into an unguarded node.
Confirm supply-voltage requirements against the exact LT1057SW ordering suffix before powering the board. The LT1057SW#TR information lists a 15 V supply test condition and a 20 V to 36 V supply range, while the available component listing also identifies the same range. Place local bypass capacitors at the supply pins with a short return path, and verify both output swing and input common-mode limits across the intended signal range.
Use short feedback paths and avoid adding excessive capacitance to either input. JFET bias current is low, but high-impedance nodes remain sensitive to moisture, contamination, leakage from adjacent circuitry, and switching-node coupling. When working at the upper end of the 5 MHz minimum gain-bandwidth product, evaluate stability with the actual source impedance, load, output network, and parasitic capacitance rather than relying only on nominal closed-loop gain.
コンプライアンス情報
The available manufacturer product page and datasheet do not state explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 qualification is not applicable to this general-purpose precision operational amplifier based on the available ordering information.
