LM224KD - Quad 1.2MHz Op Amp, 32V, 14-SOIC | Texas Instruments
Артикул: LM224KD ✓ АктивенLM224KD Обзор
An operational amplifier is an analog signal-conditioning semiconductor that uses high open-loop gain and negative feedback to amplify small voltage differences. The LM224 belongs to the operational-amplifier, analog-amplifier, and signal-conditioning IC hierarchy. Four amplifiers in one package can support independent gain stages, differential measurements, active filters, sensor conditioning, and general analog signal chains without requiring four separate packages.
Key features include four amplifier circuits, a 1.2 MHz gain-bandwidth product, operation across a broad supply-voltage range, and 2 kV ESD protection. The amplifiers are internally frequency compensated, which simplifies the implementation of stable inverting, non-inverting, summing, and feedback-controlled circuits. The 14-SOIC package also provides a familiar leaded footprint for through-hole assembly and conventional surface-mount production.
The LM224KD's single-supply capability is particularly useful in systems where a negative rail is unavailable. Its broad supply range permits operation from low-voltage analog systems as well as higher-voltage industrial and instrumentation circuits. Because it is a general-purpose device rather than a low-noise precision amplifier, designers should confirm input offset, input bias current, noise, and output-swing requirements for the specific measurement.
Typical applications include sensor-signal conditioning, test and measurement equipment, industrial control interfaces, current-loop signal processing, audio preamplification, and four-channel analog monitoring. The device is also suitable for low-frequency filter stages where the 1.2 MHz bandwidth provides useful signal-path headroom.
Design with the input common-mode range and output swing in mind, especially near the supply rails. Decoupling capacitors should be placed close to the supply pins, input and feedback resistors should preserve suitable noise and bias-current balance, and unused amplifier inputs must be tied to a defined potential rather than left floating.
This product page combines manufacturer specifications, replacement cross-reference information, package-level guidance, and application-oriented design notes to support faster component selection and PCB implementation.
Аналоги без доработки для LM224KD — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
LM224KAD
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LM224KD Максимальные параметры и электрические характеристики
| Amplifier Circuit Count | 4 circuits |
| Gain-Bandwidth Product | 1.2 MHz |
| Supply Voltage Range | 3 V to 32 V |
| Total Supply Voltage | 32 V |
| Dual-Supply Operating Range | ±16 V |
| Корпус | 14-SOIC |
| Package Width | 3.90 mm |
| Package Width | 0.154 inch |
| ESD Protection | 2 kV |
| Amplifier Type | General-purpose operational amplifier |
| Compensation | Internally frequency compensated |
| Supply Configuration | Single or split supply |
| Shipping Package | Tube |
Конфигурация выводов LM224KD
| Контакт 1 | OUT1 — Output of amplifier 1 |
| Контакт 2 | -IN1 — Inverting input of amplifier 1 |
| Контакт 3 | +IN1 — Non-inverting input of amplifier 1 |
| Контакт 4 | V- — Negative supply connection |
| Контакт 5 | +IN2 — Non-inverting input of amplifier 2 |
| Контакт 6 | -IN2 — Inverting input of amplifier 2 |
| Контакт 7 | OUT2 — Output of amplifier 2 |
| Контакт 8 | OUT3 — Output of amplifier 3 |
| Контакт 9 | -IN3 — Inverting input of amplifier 3 |
| Контакт 10 | +IN3 — Non-inverting input of amplifier 3 |
| Контакт 11 | V+ — Positive supply connection |
| Контакт 12 | -IN4 — Inverting input of amplifier 4 |
| Контакт 13 | +IN4 — Non-inverting input of amplifier 4 |
| Контакт 14 | OUT4 — Output of amplifier 4 |
Типичное применение
LM224KD подходит для 6 применениеs: Industrial Sensor Signal Conditioning, Test and Measurement Front End, Single-Supply Data Acquisition, Active Audio and Control Amplification, Current and Voltage Loop Conditioning, Portable IoT Sensor Interface.
Industrial Sensor Signal Conditioning
The LM224KD fits industrial sensor-conditioning modules that need several amplified channels in a compact 14-SOIC package. Its four independent, internally compensated amplifiers can support non-inverting sensor stages, differential buffers, gain stages, and active filtering, while operation from 3 V to 32 V covers both compact control electronics and wider industrial rails. The 1.2 MHz gain-bandwidth product gives low-frequency loops useful bandwidth headroom. Design each channel around the sensor's output range, verify the input common-mode limits, and use local supply bypassing to prevent switching equipment or long sensor cables from adding noise and instability.
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Test and Measurement Front End
The LM224KD is useful in test and measurement front ends requiring four general-purpose amplifiers around a 1.2 MHz bandwidth class. Each channel can form an input buffer, differential stage, active gain block, or output driver without relying on external compensation. The broad 3 V to 32 V supply range supports laboratory modules operating from low-voltage rails to split ±16 V systems. For accurate measurements, keep resistor networks low enough to avoid excessive Johnson noise, provide stable reference paths, and compare the actual offset and bias-current requirements with the precision needed by the instrument.
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Single-Supply Data Acquisition
The LM224KD suits single-supply data-acquisition boards where a negative rail is unavailable or costly to generate. Its four amplifier channels can buffer multiplexed sensor inputs, implement gain and filtering, and drive analog inputs, while the 3 V minimum operating voltage supports low-voltage embedded systems. The 1.2 MHz gain-bandwidth product is adequate for many sensor-bandwidth and anti-alias-filter requirements. Check the common-mode input range at the selected supply voltage, keep high-impedance traces short, and provide separate clean ground returns so input buffers do not share noise-producing current paths.
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Active Audio and Control Amplification
The LM224KD can provide low-frequency audio preamplification or general control-signal amplification where a four-channel package reduces board area. The internally compensated amplifiers support stable inverting and non-inverting configurations, and the 1.2 MHz bandwidth covers voice-band and many control-loop applications. Each channel should use an appropriate feedback network and output-loading arrangement, with care taken to prevent oscillation when driving capacitive loads. Compared with a dedicated audio amplifier, the LM224KD is primarily a general-purpose signal-conditioning device, so its noise, offset, output swing, and slew-rate requirements must be evaluated for the intended channel.
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Current and Voltage Loop Conditioning
The LM224KD is appropriate for current-loop and voltage-loop conditioning blocks that require stable gain stages at low frequencies. Four channels can be allocated among input conditioning, error amplification, output buffering, and active filtering, while the 3 V to 32 V range supports both compact electronics and higher-voltage interfaces. The internal frequency compensation simplifies loop implementation, but stability still depends on correct feedback topology and load characteristics. For high-current measurements, use a dedicated current-sense amplifier and connect the LM224KD downstream for filtering or gain adjustment rather than forcing the general-purpose amplifier to perform the precision shunt measurement.
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Portable IoT Sensor Interface
The LM224KD can support compact IoT sensor interfaces that need several analog channels but must operate from a single low-voltage rail. Four independent amplifiers can buffer resistive sensors, scale thermocouple or bridge outputs, and implement filtering around an ADC. The 3 V minimum supply permits integration with 3.3 V systems, while the 14-SOIC package remains compatible with conventional PCB assembly. Low-power designs should account for the amplifier quiescent current and disable unused channels where appropriate. High-impedance sensor nodes also need guarded layouts, low-leakage protection, and careful separation from wireless, switching, and display circuitry.
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Сводка рекомендуемых товаров
Справочные инженерные данные для LM224KD — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LM224KAD |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Package | 14-SOIC (3.90 mm width) | 14-SOIC - same package |
| Amplifier Circuit Count | 4 circuits | 4 circuits |
| Gain-Bandwidth Product | 1.2 MHz | 1.2 MHz |
| Pin Compatibility | 14-pin LM224 pinout | Pin-to-pin replacement according to cross-reference information |
Ключевые отличия
- Four independent general-purpose amplifiers in one package (против LM224KAD)
- Broad supply operation for single- and dual-rail systems (против LM224KAD)
- Internally compensated operation simplifies analog design (против LM224KAD)
Заметки по проектированию
Place the positive-supply bypass capacitor directly beside pin 11 and the negative-supply bypass capacitor beside pin 4. For single-supply operation, connect the negative supply to ground and include local bulk capacitance close to the device. Keep the capacitor return path short and use a continuous ground plane; excessive trace length between the capacitor and supply pin can undermine the high-frequency bypass function.
Route each amplifier's non-inverting input away from switching nodes, relay contacts, inductor connections, and other high-impedance noise sources. Maintain a continuous ground reference beneath analog traces where possible, and avoid routing sensitive inputs between pins carrying supply current. The LM224KD contains four channels in one package, so cross-channel coupling is possible when sensitive and switching signals share the same board region.
Do not assume the full supply voltage is available as signal swing or input common-mode range. Check the LM224 datasheet electrical characteristics for the selected 3 V to 32 V operating condition, especially at low supply voltages. Configure unused channels as voltage followers with the non-inverting input tied to a defined common-mode reference, and do not leave an amplifier output unconnected when it is possible for the channel to saturate.
Информация о соответствии
The manufacturer product page does not state the requested compliance classifications in the indexed information.