AD8618ARZ - 20MHz CMOS Quad Rail-to-Rail Op Amp | Analog Devices
Артикул: AD8618ARZ ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $4.35 | $4,35 |
| 10 | $3.92 | $39,20 |
| 100 | $3.49 | $349,00 |
| 500 | $3.14 | $1.570,00 |
| 1.000 | $2.83 | $2.830,00 |
AD8618ARZ Обзор
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output. It is a fundamental building block in analog signal conditioning, used to amplify, filter, or buffer signals. The AD8618 belongs to the precision CMOS op amp family, which combines low power consumption with high accuracy, making it suitable for battery-powered and high-resolution systems.
Key features include a maximum offset voltage of 65 µV, a gain-bandwidth product of 20 MHz, a slew rate of 12 V/µs, and a low noise density of 8 nV/√Hz. The rail-to-rail input and output stages allow the amplifier to operate with the full supply range, maximizing dynamic range in single-supply applications. The device also features a patented trimming technique that ensures low offset and drift over temperature.
The AD8618 uses a CMOS process technology, which provides high input impedance and low input bias current, typically in the picoampere range. This makes it suitable for interfacing with high-impedance sensors and precision integrators. The quad configuration allows for compact designs, reducing board space and component count in multi-channel systems.
Typical applications include portable instrumentation, active filters, analog-to-digital converter (ADC) drivers, and audio signal conditioning. The low noise and wide bandwidth make it suitable for medical and industrial sensing applications where signal integrity is critical.
When designing with the AD8618, ensure proper power supply decoupling with 0.1 µF ceramic capacitors close to the supply pins. The rail-to-rail output stage can drive capacitive loads, but a series resistor may be needed to maintain stability with large load capacitances.
Аналоги без доработки для AD8618ARZ — 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 AD8618ARZ (тот же форм-фактор и посадочное место) — отличается по Gain Bandwidth Product, Package, Supply Voltage Range.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
AD8608ARZ
✅ Прямая замена✓ В наличии
$1.82 / шт.
Открыть даташит →AD8618ARZ Максимальные параметры и электрические характеристики
| Number of Channels | 4 |
| Supply Voltage Range | 2.7 V to 5 V |
| Gain Bandwidth Product | 20 MHz |
| Slew Rate | 12 V/µs |
| Offset Voltage (max) | 65 µV |
| Input Voltage Noise Density | 8 nV/√Hz |
| Input Bias Current | 0.2 pA (typ) |
| Rail-to-Rail Input | Yes |
| Rail-to-Rail Output | Yes |
| Диапазон рабочих температур | -40°C to +125°C |
| Корпус | 14-SOIC |
| Тип монтажа | Surface Mount |
| Статус RoHS | Compliant |
| Amplifier Type | CMOS |
Конфигурация выводов AD8618ARZ
| Контакт 1 | OUT A — Output of amplifier A |
| Контакт 2 | -IN A — Inverting input of amplifier A |
| Контакт 3 | +IN A — Non-inverting input of amplifier A |
| Контакт 4 | V+ — Positive supply |
| Контакт 5 | +IN B — Non-inverting input of amplifier B |
| Контакт 6 | -IN B — Inverting input of amplifier B |
| Контакт 7 | OUT B — Output of amplifier B |
| Контакт 8 | OUT C — Output of amplifier C |
| Контакт 9 | -IN C — Inverting input of amplifier C |
| Контакт 10 | +IN C — Non-inverting input of amplifier C |
| Контакт 11 | V- — Negative supply (ground in single-supply) |
| Контакт 12 | +IN D — Non-inverting input of amplifier D |
| Контакт 13 | -IN D — Inverting input of amplifier D |
| Контакт 14 | OUT D — Output of amplifier D |
Типичное применение
AD8618ARZ подходит для 6 применениеs: Portable Instrumentation, Active Filters, ADC Driver, Audio Signal Conditioning, Medical Sensing, Industrial Control.
Portable Instrumentation
The AD8618ARZ's low power consumption and rail-to-rail operation make it ideal for battery-powered instruments. Its 2.7V to 5V supply range aligns with Li-ion battery outputs, and the low offset voltage (65 µV max) ensures accurate measurements. The quad configuration allows multiple signal conditioning channels in a compact footprint, reducing board space and extending battery life in handheld multimeters and data loggers.
Рекомендуется
Active Filters
With a 20 MHz gain bandwidth product and 12 V/µs slew rate, the AD8618ARZ is well-suited for active filter designs in communication and audio systems. The high bandwidth allows implementation of Butterworth or Chebyshev filters up to several megahertz. The low noise (8 nV/√Hz) preserves signal-to-noise ratio, and the rail-to-rail output maximizes dynamic range. Each of the four amplifiers can be used for a different filter stage, enabling compact multi-pole designs.
Рекомендуется
ADC Driver
The AD8618ARZ can drive high-resolution ADCs with its low output impedance and rail-to-rail output. Its 20 MHz bandwidth ensures minimal settling time for fast sampling rates, and the low noise (8 nV/√Hz) does not degrade the ADC's SNR. The quad configuration allows buffering multiple ADC inputs, such as in a data acquisition system. The device's low offset voltage (65 µV) minimizes DC errors in the signal chain.
Рекомендуется
Audio Signal Conditioning
The AD8618ARZ's low noise (8 nV/√Hz) and wide bandwidth (20 MHz) make it suitable for audio preamplifiers and equalizers. The rail-to-rail output allows maximum signal swing without clipping, and the low distortion ensures high-fidelity reproduction. The quad configuration enables stereo channels with additional filtering or mixing stages. Its single-supply operation simplifies audio system design, and the low power consumption is beneficial for portable audio devices.
Рекомендуется
Medical Sensing
In medical devices like ECG and pulse oximeters, the AD8618ARZ provides low-noise amplification of biosignals. Its low input bias current (0.2 pA) minimizes loading on high-impedance electrodes, and the low offset voltage (65 µV) reduces baseline drift. The 2.7V to 5V supply range is compatible with battery-powered medical monitors. The quad configuration allows multiple signal channels for multi-lead ECG, and the wide bandwidth supports fast signal transients.
Рекомендуется
Industrial Control
The AD8618ARZ is used in industrial control systems for signal conditioning of sensors and actuators. Its wide supply range (2.7V to 5V) and rail-to-rail operation interface directly with microcontrollers and ADCs. The low offset voltage ensures accurate process control, and the 20 MHz bandwidth supports fast control loops. The quad configuration reduces component count in multi-channel PLCs and motor controllers, and the -40°C to +125°C temperature range suits harsh environments.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для AD8618ARZ — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | AD8608ARZ | AD8618ARUZ | OPA4227PA |
|---|---|---|---|---|
| Package | 14-SOIC | 14-SOIC | 14-TSSOP | 14-DIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Number of Channels | 4 | 4 | 4 | 4 |
| Gain Bandwidth Product | 20 MHz | 10 MHz | 20 MHz | 8 MHz |
| Slew Rate | 12 V/µs | 5 V/µs | 12 V/µs | 2.3 V/µs |
| Offset Voltage (max) | 65 µV | 65 µV | 65 µV | 75 µV |
| Input Noise Density | 8 nV/√Hz | 12 nV/√Hz | 8 nV/√Hz | 4.5 nV/√Hz |
| Supply Voltage Range | 2.7V to 5V | 2.7V to 5V | 2.7V to 5V | ±2.5V to ±18V |
Ключевые отличия
- Higher bandwidth than AD8608ARZ (против AD8608ARZ)
- Lower noise than AD8608ARZ (против AD8608ARZ)
- Lower offset voltage than OPA4227 (против OPA4227PA)
Заметки по проектированию
The AD8618ARZ operates from a single 2.7V to 5V supply. Use a 0.1 µF ceramic capacitor close to each supply pin (V+ and V-) to decouple high-frequency noise. For optimal performance, a 10 µF tantalum capacitor in parallel is recommended for low-frequency stability. Ensure the supply voltage does not exceed 5V to avoid damage.
For best noise performance, keep the input traces short and shielded from digital signals. Use a ground plane under the op amp to reduce parasitic capacitance and noise pickup. Place the feedback resistors close to the inverting input to minimize stray capacitance, which can cause instability. The 14-SOIC package has a 1.27 mm pitch, allowing standard PCB routing.
The rail-to-rail output stage can drive capacitive loads, but large capacitances ( >100 pF) may cause oscillation. Add a series resistor (e.g., 50Ω) at the output to isolate capacitive loads. Also, avoid exceeding the input common-mode range, even though it extends beyond the rails; doing so may cause phase reversal. Always refer to the datasheet's absolute maximum ratings.
Информация о соответствии
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
