LT1114S - Quad Low Power Precision Op Amp | Analog Devices
Артикул: LT1114S ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $12.5 | $12,50 |
| 10 | $11.2 | $112,00 |
| 100 | $9.85 | $985,00 |
| 500 | $8.4 | $4.200,00 |
| 1.000 | $7.1 | $7.100,00 |
LT1114S Обзор
A precision op amp is a linear integrated circuit that amplifies low-level analog signals with high accuracy, characterized by low input offset voltage, low input bias current, low noise, and high open-loop gain. The LT1114S belongs to the operational amplifier family within the amplifier IC hierarchy, which falls under the broader category of analog signal conditioning ICs in mixed-signal semiconductor design. Quad packages integrate four independent op amps for channel-dense applications such as multi-sensor signal conditioning, instrumentation front-ends, and active filter banks.
The LT1114S achieves 60 µV maximum offset voltage on the prime grade and 75 µV on the low-cost grade, with picoampere input bias current and low supply current per amplifier. It operates from ±1 V to ±20 V supplies, has a 750 kHz gain-bandwidth product, and 0.27 V/µs slew rate. The device includes industry-standard pinout in the SOIC-16 (S16) package, enabling direct drop-in upgrades of legacy quad precision op amps such as the OP-400, OP-497, and AD704.
The LT1114S uses a bipolar input stage with bias-current cancellation that delivers picoampere input bias current without the noise penalty of CMOS JFET inputs. Its trimmed input stage and on-chip temperature compensation keep offset voltage low across the -40 °C to +85 °C industrial temperature range, supporting precision measurement systems that must hold calibration over thermal cycling.
Typical applications include precision instrumentation amplifiers, strain-gauge and thermocouple signal conditioning, multi-channel data-acquisition front-ends, medical instrumentation, and active analog filters. The wide supply range also supports ±15 V industrial systems.
When designing with the LT1114S, choose the prime grade when offset voltage and drift directly impact system accuracy; choose the low-cost grade when budget dominates and 75 µV offset is acceptable. The LT1114S is pin-compatible with the OP-400, OP-497, and AD704 quads, allowing board-level upgrades with no PCB rework.
This page synthesizes distributor pricing, drop-in upgrade alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers select and source the LT1114S for precision analog designs.
Аналоги без доработки для LT1114S — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с LT1114S (тот же форм-фактор и посадочное место) — отличается по Amplifier Type, Mounting Type, Number of Channels, RoHS Status, Supply Voltage Range.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
LT1114S#PBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LT1114IS#PBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LT1114CS#PBF
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
OP-400
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD704TQ/883B
✅ Прямая замена✓ В наличии
$16.5 / шт.
Открыть даташит →OP-497
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LT1114S Максимальные параметры и электрические характеристики
| Amplifier Type | Precision Operational Amplifier |
| Number of Channels | 4 (Quad) |
| Корпус | 16-SOIC (S16) |
| Supply Voltage Range | ±1 V to ±20 V |
| Gain-Bandwidth Product | 750 kHz |
| Slew Rate | 0.27 V/µs (typ), 0.3 V/µs (per datasheet header) |
| Input Offset Voltage (Prime Grade, max) | 60 µV |
| Input Offset Voltage (Low Cost Grade, max) | 75 µV |
| Input Bias Current | Picoampere range |
| Pinout | Industry-standard quad SOIC |
| Статус RoHS | Compliant (Pb-free #PBF suffix) |
| Тип монтажа | Surface Mount |
| Industry Pin-Compatible Replacements | OP-400, OP-497, AD704 |
Конфигурация выводов LT1114S
| Контакт 1 | OUT A — Output, amplifier A |
| Контакт 2 | -IN A — Inverting input, amplifier A |
| Контакт 3 | +IN A — Non-inverting input, amplifier A |
| Контакт 4 | V- — Negative supply |
| Контакт 5 | +IN B — Non-inverting input, amplifier B |
| Контакт 6 | -IN B — Inverting input, amplifier B |
| Контакт 7 | OUT B — Output, amplifier B |
| Контакт 8 | OUT C — Output, amplifier C |
| Контакт 9 | -IN C — Inverting input, amplifier C |
| Контакт 10 | +IN C — Non-inverting input, amplifier C |
| Контакт 11 | NC / Trim C — No-connect or offset trim, amplifier C (no-connect on 'S' grade) |
| Контакт 12 | +IN D — Non-inverting input, amplifier D |
| Контакт 13 | -IN D — Inverting input, amplifier D |
| Контакт 14 | OUT D — Output, amplifier D |
| Контакт 15 | NC / Trim D — No-connect or offset trim, amplifier D (no-connect on 'S' grade) |
| Контакт 16 | V+ — Positive supply |
Типичное применение
LT1114S подходит для 7 применениеs: Strain-Gauge Signal Conditioning, Thermocouple Front-End Amplifier, Multi-Channel Data Acquisition Front-End, Active Analog Filter Implementation, Medical Instrumentation Amplifiers, Precision Instrumentation Buffer, Photodiode Transimpedance Amplifier.
Strain-Gauge Signal Conditioning
The LT1114S's picoampere input bias current and 60 µV prime-grade offset voltage make it well-suited to bridge-amplifier signal conditioning for strain gauges and load cells. The 750 kHz gain-bandwidth product is more than sufficient for the DC-to-low-frequency bandwidth typical of strain-gauge measurement (typically <10 kHz). The quad package allows a single IC to handle four bridges for multi-axis force measurement. Use the LT1114S with 1% thin-film gain-setting resistors to preserve precision; expect thermal drift around 0.5 µV/°C typical. Per the Analog Devices datasheet 111214fb, this is one of the design's primary target applications.
Рекомендуется
Thermocouple Front-End Amplifier
The LT1114S serves as an excellent cold-junction compensation and thermocouple amplifier front-end due to its picoampere input bias current, which avoids self-heating bias errors on high-impedance thermocouple junctions. The 60 µV prime-grade offset is well below the typical K-type thermocouple Seebeck coefficient of ~40 µV/°C, preserving accurate temperature readings. Four channels in one SOIC-16 enable multi-zone temperature data acquisition. Use the prime grade for sub-°C accuracy; the low-cost grade (75 µV) suits ±1 °C systems. The datasheet 111214fb shows typical thermocouple conditioning circuits using the LT1114S.
Рекомендуется
Multi-Channel Data Acquisition Front-End
The LT1114S integrates four precision amplifiers in a single 16-SOIC package, making it ideal for multi-channel 16-bit and 18-bit SAR ADC front-ends where each channel needs its own buffer or instrumentation amplifier. The 750 kHz gain-bandwidth product supports the settling requirements of ADCs sampling up to 100 kSPS, while the 0.27 V/µs slew rate handles full-scale input steps. The picoampere input bias current is essential for direct connection to high-impedance sensor sources such as pH electrodes and photodiodes. Per the ADI datasheet 111214fb, this is a primary application.
Рекомендуется
Active Analog Filter Implementation
The LT1114S is well-suited to active analog filter implementations such as Sallen-Key low-pass, high-pass, and band-pass filters up to ~100 kHz cutoff, leveraging its 750 kHz gain-bandwidth product. The quad package enables four simultaneous filter channels for audio crossover networks, anti-aliasing filters, or telecommunications channel filters. Low bias current keeps resistor values high (100 kΩ to 1 MΩ) without introducing DC error. The datasheet 111214fb includes typical filter circuits. Compensation capacitor layout is critical - keep traces short to maintain stability.
Рекомендуется
Medical Instrumentation Amplifiers
The LT1114S delivers the precision required for medical instrumentation such as ECG front-ends, EEG amplifiers, and patient monitoring where picoampere input bias current and low noise are critical for high-impedance biopotential electrodes. The 750 kHz GBW comfortably supports the 0.05 Hz to 1 kHz ECG signal band and the 0.5 Hz to 100 Hz EEG band with ample headroom for filtering. The quad form factor enables multi-lead ECG (RA, LA, RL, LL) using a single IC, reducing board area in wearable monitors. Choose the LT1114IS#PBF industrial temp grade for medical-grade designs. The datasheet 111214fb cites this use case.
Рекомендуется
Precision Instrumentation Buffer
The LT1114S serves as a precision buffer between high-impedance sensors and downstream signal chains such as ADCs, sample-and-hold circuits, or long cable runs. The unity-gain buffer configuration leverages the 750 kHz GBW and 0.27 V/µs slew rate for faithful signal transfer. Picoampere input bias current is critical when buffering photodiodes, pH probes, or any source with source impedance above 100 kΩ. The quad package enables four-channel buffer banks. Place input traces away from digital lines to prevent crosstalk. The datasheet 111214fb details typical unity-gain buffer applications.
Рекомендуется
Photodiode Transimpedance Amplifier
The LT1114S functions effectively as a multi-channel photodiode transimpedance amplifier (TIA) in spectroscopy, optical communications, and light-measurement instrumentation. The picoampere input bias current minimizes dark-current errors when amplifying low-light photodiode signals with transimpedance gains of 100 kΩ to 10 MΩ. Four independent channels in a 16-SOIC enable four-color optical detector front-ends or multi-pixel imaging arrays. Use 1% metal-film feedback resistors and guard rings around the inverting input to minimize leakage. The datasheet 111214fb describes typical TIA configurations.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LT1114S — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LT1114S#PBF | LT1114IS#PBF | LT1114CS#PBF | OP-400 | AD704 | OP-497 |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 16-SOIC | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same |
| Channels | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Gain-Bandwidth Product | 750 kHz | 750 kHz | 750 kHz | 750 kHz | 500 kHz | 800 kHz | 500 kHz |
| Slew Rate | 0.27 V/µs | 0.27 V/µs | 0.27 V/µs | 0.27 V/µs | 0.15 V/µs | 0.3 V/µs | 0.15 V/µs |
| Input Offset Voltage (max) | 60 µV (prime) / 75 µV (low-cost) | 60 µV / 75 µV | 60 µV / 75 µV | 60 µV / 75 µV | 60 µV | 50 µV | 80 µV |
| Supply Voltage Range | ±1 V to ±20 V | ±1 V to ±20 V | ±1 V to ±20 V | ±1 V to ±20 V | ±2.5 V to ±20 V | ±1 V to ±18 V | ±2 V to ±20 V |
| RoHS Status | Compliant (#PBF variant) | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
| Input Bias Current | Picoampere range | Picoampere | Picoampere | Picoampere | Picoampere | Picoampere | Picoampere |
Ключевые отличия
- Lowest-cost prime-grade quad precision op amp with 60 µV offset (против OP-400)
- Higher GBW than AD704 with comparable offset drift (против AD704)
- Quad form factor for channel density (против LT1112 (dual))
- Pin-compatible direct replacement for legacy quad precision op amps (против OP-497)
Заметки по проектированию
Use a ground plane to keep ground impedance low and provide shielding. Place 0.1 µF ceramic bypass capacitors within 5 mm of each supply pin (V+ pin 16, V- pin 4) to suppress high-frequency noise. For the quad LT1114S, ensure each supply trace is wide enough to carry the combined quiescent current of four amplifiers without significant IR drop. Per the Analog Devices datasheet 111214fb, supply decoupling is critical to achieve the specified 750 kHz GBW without oscillation.
Estimated: at maximum ±20 V supply and 1 mA quiescent per amplifier, four amplifiers dissipate roughly (40 V × 1 mA × 4) = 160 mW total. The 16-SOIC package has a thermal resistance theta_JA of approximately 100 C/W, yielding a junction temperature rise of 16 °C above ambient at full supply - well within the -40 °C to +85 °C industrial operating range. For high-density designs, place copper pours on both top and bottom layers under the SOIC to reduce junction temperature. Estimated input values used.
Do not exceed the absolute maximum supply voltage of ±22 V or the differential input voltage of ±30 V, per the Analog Devices datasheet 111214fb. When using the LT1114S in transimpedance or high-impedance sensor applications, add a guard ring around the inverting input trace to eliminate leakage currents from the PCB. Avoid routing digital signals near the inverting inputs to prevent EMI rectification. For the 'S' grade (no offset trim), do not connect anything to pins 11 and 15.
Keep input traces short and symmetric to minimize offset error from thermoelectric EMFs (Seebeck effect) at junctions of dissimilar metals. For precision thermocouple and strain-gauge applications, use a Kelvin connection at the sensor with traces of equal length and thermal mass. Place feedback and gain-setting resistors as close as possible to the inverting input pin. Avoid running input traces parallel to noisy supply or digital lines; if crossing is unavoidable, cross at 90 degrees. Per the ADI datasheet 111214fb PCB layout guidelines.
Информация о соответствии
RoHS compliance applies to the LT1114S#PBF lead-free variant. Non-#PBF LT1114S (leaded finish) is available for legacy applications. REACH, halogen-free, and conflict minerals status not explicitly stated in the provided web data; marked unknown.
