LT1112S8 - Dual Picoamp Op Amp, 750kHz | Analog Devices
部品番号: LT1112S8 ✗ 生産終了LT1112S8 概要
An operational amplifier is an analog integrated circuit that amplifies the voltage difference between its non-inverting and inverting inputs while using negative feedback to establish closed-loop gain. The dual LT1112 contains two amplifiers in one package. In the broader semiconductor hierarchy, it is an operational amplifier, an analog amplifier IC, and a low-power precision signal-conditioning component designed for accurate signal conditioning rather than high-current power delivery.
The verified LT1112 family emphasizes a combination of low cost and precision. Its low bias current reduces measurement error in high-impedance sources, while low input noise supports resolution-sensitive measurements. The 750 kHz gain-bandwidth product is sufficient for many low-frequency precision loops and modest signal-bandwidth requirements. Standard pinout, surface-mount availability, and the low-cost grade are specifically identified in the retrieved LT1112S8 information.
The family description states that the LT1112 dual and LT1114 quad amplifiers combine low cost with outstanding precision specifications. The verified S8 package information and standard pinout support use in compact analog circuits. The specified offset voltage and drift are important when measuring small differential signals because input-referred offset can appear directly as measurement error, while drift changes that error with temperature.
Typical uses include photodiode and other high-impedance sensor interfaces, precision current-to-voltage conversion, low-level signal amplification, instrumentation, and audio or analog test equipment. The low input bias current is especially useful when source leakage would otherwise disturb the measured node. The 750 kHz bandwidth should be checked against required signal bandwidth and closed-loop stability requirements.
When laying out the circuit, use short input traces, clean grounding, and supply bypassing close to the device. Do not infer input common-mode, supply, or absolute maximum limits from the snippets; consult the manufacturer datasheet before final design release. The retrieved distributor result confirms the purchasable leaded, tape-and-reel ordering code LT1112S8#PBF, while the base MPN remains LT1112S8.
ドロップイン代替品: LT1112S8 — 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。
LT1112S8#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1112S8#TR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1112IS8#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1112IS8#TR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1112MPS8#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1112S8 最大定格＆電気的特性
| Amplifier Type | Dual precision operational amplifier |
| Number of Channels | 2 |
| Gain-Bandwidth Product | 750 kHz |
| Maximum Offset Voltage, Prime Grade | 60 µV |
| Maximum Offset Voltage, Low-Cost Grade | 75 µV |
| Maximum Offset Voltage Drift | 0.5 µV/°C |
| Maximum Input Bias Current | 250 pA |
| 0.1-to-10 Hz Input Noise | 0.3 µVP-P |
| Maximum Supply Current per Amplifier | 400 µA |
| パッケージ | 8-pin SO |
| Pinout | Standard pinout |
| 実装タイプ | Surface mount |
| Packaging | Tape and reel |
LT1112S8 8-pin so ピン配置ガイド
LT1112S8 (8-pin so 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: LT1112S8.
詳細は データシート をご参照ください。
主な用途
LT1112S8 の用途: 6 件s: Photodiode Signal Conditioning, Precision Current-to-Voltage Conversion, High-Impedance Instrumentation, Low-Level Analog Signal Conditioning, Audio and Measurement Preamplification, Battery-Powered Precision Circuits.
Photodiode Signal Conditioning
The LT1112S8 fits photodiode and other high-impedance source interfaces because the verified family specification reaches only 250 pA maximum input bias current. Place one dual-channel device in a transimpedance or guarded-input configuration, with the sensor node kept short and protected from leakage and ESD. The 0.3 µVP-P 0.1-to-10 Hz noise figure can help preserve low-frequency signal resolution, while the 60 µV prime-grade maximum offset and 0.5 µV/°C drift constrain input-referred error. This is a precision measurement use case; the 750 kHz gain-bandwidth product should be checked against the intended detector bandwidth.
おすすめ
Precision Current-to-Voltage Conversion
Use the LT1112S8 as a transimpedance amplifier when a small sensor current must be converted into a measurable voltage. Its verified 250 pA maximum input bias current reduces unwanted current injected into a high-impedance sensing node, and the 0.5 µV/°C maximum offset drift limits temperature-dependent error in the amplifier itself. The 750 kHz gain-bandwidth product supports low-frequency precision loops and many practical sensor bandwidths. Feedback resistor and capacitor values must be selected against the target transimpedance, input capacitance, stability requirements, and the complete manufacturer electrical limits.
おすすめ
High-Impedance Instrumentation
The LT1112S8 is suitable for instrumentation front ends where leakage from the amplifier could alter the measurement of a high-impedance probe or sensor. Its maximum input bias current of 250 pA is the key parameter for this use, while the low offset and drift help preserve DC accuracy. The dual package provides two matched functional channels for differential or related signal-conditioning paths, subject to final channel-to-channel verification. The 750 kHz bandwidth is appropriate for many measurement signals but not a guarantee of high-speed settling; application-specific frequency and stability checks remain necessary.
おすすめ
Low-Level Analog Signal Conditioning
The LT1112S8 can amplify low-level differential signals in analog measurement chains where offset and noise are important. Its verified prime-grade offset limit is 60 µV, low-cost-grade limit is 75 µV, and 0.1-to-10 Hz noise is 0.3 µVP-P. These specifications help establish the smallest signal that can be resolved before considering resistor noise, source impedance, and downstream conversion. The 750 kHz gain-bandwidth product allows moderate closed-loop bandwidth, so designers should set the desired gain and signal bandwidth together and confirm stability with the chosen feedback network.
おすすめ
Audio and Measurement Preamplification
The LT1112S8 may be used in audio or general measurement preamplifiers when the design requires low offset and low power rather than maximum bandwidth. The verified 400 µA maximum supply current per amplifier helps limit power demand, while the 750 kHz gain-bandwidth product is suitable for many low-frequency and moderate-bandwidth signal paths. Low-frequency noise of 0.3 µVP-P from 0.1 to 10 Hz can be useful for quiet measurement channels. Check input common-mode range, output swing, supply voltage, and slew-rate requirements in the complete datasheet before selecting the device.
おすすめ
Battery-Powered Precision Circuits
The LT1112S8 supports battery-powered precision analog designs because the verified specification lists no more than 400 µA supply current per amplifier. That low-power characteristic can be valuable when every milliamp affects battery life, while the precision input specifications help preserve measurement quality. Use both channels for gain or filtering functions when appropriate, and verify the actual supply range and quiescent-current conditions in the manufacturer datasheet. Board-level leakage, protection diodes, reference circuits, and external sensor current can dominate the final system power budget.
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: LT1112S8 — 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 | LT1112S8#PBF | LT1112S8#TR | LT1112IS8#PBF | LT1112IS8#TR | LT1112MPS8#PBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
主な差別化要因
- Very low input bias current for precision high-impedance measurement （vs OPA2132)
- Low-frequency noise and offset performance （vs OP275)
- Low-power dual precision configuration （vs MCP6022)
設計ノート
Use short, guarded input traces for high-impedance sources because even small parasitic capacitance and board leakage can degrade the benefit of the verified 250 pA maximum input bias current. Keep the sensor return path close to the amplifier ground and avoid routing sensitive inputs beside power or switching nodes. The final layout should be checked against the exact input capacitance, feedback network, and operating common-mode range in the manufacturer datasheet.
Place the required supply-bypass capacitor close to the device pins and keep supply return paths short. The verified maximum supply current is 400 µA per amplifier, but actual current depends on supply voltage, output conditions, input common-mode range, and the selected grade. Confirm quiescent and load-current limits from the datasheet before sizing the rail. External reference, sensor, and protection circuits may dominate the total power budget even when the amplifier itself is low power.
Do not assume that similar LT1112 suffixes are electrically identical. The verified comparison material warns that LT1112S8 and LT1112IS8 can have consistent functional characteristics while differing in important parameters. Before substitution, compare package drawing, channel assignment, offset grade, temperature range, supply limits, common-mode range, output swing, and packaging suffix. The supplied search data does not provide a complete cross-qualification matrix.
For transimpedance applications, minimize the input-node area and place the feedback resistor and compensation capacitor directly at the relevant amplifier pins where practical. This reduces parasitic capacitance and helps preserve stability with the 750 kHz gain-bandwidth product. Calculate the required compensation using the actual sensor capacitance and feedback impedance; the supplied data does not contain enough capacitance or frequency-response data to prescribe a universal component value.
コンプライアンス情報
The verified web snippets identify the device and packaging but do not provide extractable RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. Compliance fields therefore remain unknown.
