AD8620ARZ - Precision JFET Dual Op Amp | Analog Devices
Артикул: AD8620ARZ ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $11.17 | $11,17 |
| 10 | $10.5 | $105,00 |
| 100 | $9.8 | $980,00 |
| 500 | $9.1 | $4.550,00 |
| 1.000 | $8.5 | $8.500,00 |
AD8620ARZ Обзор
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, used in signal conditioning, filtering, and mathematical operations. The AD8620 is a JFET-input op amp, meaning it uses junction field-effect transistors at the input stage, providing very high input impedance and low bias current. It belongs to the family of precision amplifiers, which prioritize accuracy, low offset, and low noise over raw speed.
Key features include a low input bias current of 1 pA, low offset voltage of 100 µV, and low noise of 6 nV/√Hz. The wide bandwidth of 25 MHz and slew rate of 25 V/µs allow use in high-speed signal paths. The dual configuration provides two independent amplifiers in one package, saving board space and cost. The AD8620 also offers excellent DC precision with low drift over temperature.
The AD8620 uses a proprietary JFET process that achieves low noise without compromising input impedance. The output stage can drive capacitive loads and provides a high output current of 30 mA. The device is fully specified for single or dual supply operation, with a supply range of ±5 V to ±13 V. The SOIC-8 package is widely used and easy to solder, with a standard pinout compatible with many other dual op amps.
Typical applications include precision data acquisition, active filters, audio preamplifiers, and sensor signal conditioning. The low noise and low bias current make it suitable for photodiode amplifiers and high-impedance sensor interfaces. The wide bandwidth supports video and communication applications.
When designing with the AD8620, ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors close to the device. The input common-mode range extends to the negative rail, but for best performance, keep inputs within the specified range. The output can swing close to the rails, but avoid heavy loads that may cause thermal issues.
Аналоги без доработки для AD8620ARZ — 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 AD8620ARZ (тот же форм-фактор и посадочное место) — отличается по Slew Rate, Amplifier Type, Gain Bandwidth Product, Current - Output / Channel, Current - Supply.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
AD8620BRZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD8620ARZ-REEL7
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADA4610-2ARZ
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$2.19 / шт.
Открыть даташит →OPA2134
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
AD8512ARZ
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$2.25 / шт.
Открыть даташит →AD8620ARZ Максимальные параметры и электрические характеристики
| Amplifier Type | J-FET |
| Number of Circuits | 2 |
| Тип выхода | Rail-to-Rail |
| Slew Rate | 25 V/µs |
| Gain Bandwidth Product | 25 MHz |
| Current - Input Bias | 1 pA |
| Voltage - Input Offset | 100 µV |
| Current - Supply | 3.5 mA (x2 channels) |
| Current - Output / Channel | 30 mA |
| Voltage - Supply Span (Min) | ±5 V |
| Voltage - Supply Span (Max) | ±13 V |
| Рабочая температура | -40°C to +125°C |
| Корпус / Типоразмер | 8-SOIC (0.154", 3.90mm Width) |
| Тип монтажа | Surface Mount |
| Статус RoHS | Compliant |
Конфигурация выводов AD8620ARZ
| 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- — Negative supply voltage |
| 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 | V+ — Positive supply voltage |
Типичное применение
AD8620ARZ подходит для 6 применениеs: Precision Data Acquisition, Audio Preamplifier, Active Filters, Sensor Signal Conditioning, Medical Instrumentation, Test and Measurement.
Precision Data Acquisition
The AD8620ARZ's low offset voltage (100 µV), low drift, and low noise (6 nV/√Hz) make it ideal for precision data acquisition systems. It can buffer high-impedance sensors and drive high-resolution ADCs without introducing significant errors. The wide bandwidth supports fast sampling rates, while the low bias current (1 pA) minimizes leakage in sample-and-hold circuits. In a typical DAQ front-end, the AD8620ARZ is used as a buffer or gain stage, providing accurate signal conditioning for industrial and laboratory instrumentation.
Рекомендуется
Audio Preamplifier
With low noise and wide bandwidth, the AD8620ARZ is well-suited for high-fidelity audio preamplifiers. Its JFET input provides high input impedance, preserving the signal from high-impedance sources like guitar pickups and condenser microphones. The low distortion and high slew rate (25 V/µs) ensure clean reproduction of transient signals. In a phono preamp, the AD8620ARZ can provide RIAA equalization with minimal added noise, making it a popular choice for audiophile-grade equipment.
Рекомендуется
Active Filters
The AD8620ARZ's 25 MHz gain-bandwidth product allows implementation of high-frequency active filters with accurate cutoff frequencies. Its low offset and drift ensure DC accuracy in integrator and low-pass filter circuits. The high output current (30 mA) enables driving capacitive loads without stability issues. In a 4th-order Butterworth low-pass filter for anti-aliasing, the AD8620ARZ provides the necessary gain and phase response while maintaining low noise, making it suitable for communication and instrumentation systems.
Рекомендуется
Sensor Signal Conditioning
The AD8620ARZ's ultra-low bias current (1 pA) is critical for conditioning high-impedance sensors such as photodiodes, pH probes, and piezoelectric sensors. It minimizes offset errors caused by input bias current flowing through source resistance. The low noise and wide bandwidth allow amplification of small signals with high fidelity. In a photodiode amplifier, the AD8620ARZ can be configured as a transimpedance amplifier with a feedback resistor, providing a voltage output proportional to light intensity with minimal noise.
Рекомендуется
Medical Instrumentation
In medical devices like ECG and EEG monitors, the AD8620ARZ provides the precision and low noise required for biopotential signal acquisition. Its low offset voltage and drift ensure accurate baseline restoration, while the high common-mode rejection ratio rejects interference. The wide bandwidth supports diagnostic frequencies up to 1 kHz. The device's low power consumption (3.5 mA per channel) is suitable for battery-powered portable monitors, and its small SOIC-8 package fits compact PCB designs.
Рекомендуется
Test and Measurement
The AD8620ARZ is used in bench instruments like oscilloscopes, spectrum analyzers, and multimeters for signal conditioning. Its wide bandwidth and fast slew rate preserve waveform integrity, while low offset and drift ensure measurement accuracy. The high input impedance minimizes loading on the device under test. In a digital multimeter's AC/DC converter stage, the AD8620ARZ can provide precision rectification and amplification, enabling accurate readings across a wide frequency range.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для AD8620ARZ — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | AD8620BRZ | AD8620ARZ-REEL7 | ADA4610-2ARZ | OPA2134 | AD8512ARZ |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Gain Bandwidth Product | 25 MHz | 25 MHz | 25 MHz | 10 MHz | 8 MHz | 8 MHz |
| Input Bias Current | 1 pA | 1 pA | 1 pA | 2 pA | 5 pA | 25 pA |
| Voltage - Input Offset | 100 µV | 50 µV | 100 µV | 50 µV | 100 µV | 100 µV |
| Slew Rate | 25 V/µs | 25 V/µs | 25 V/µs | 10 V/µs | 20 V/µs | 8 V/µs |
| Voltage - Supply Span (Max) | ±13 V | ±13 V | ±13 V | ±15 V | ±18 V | ±15 V |
| Current - Supply (per channel) | 3.5 mA | 3.5 mA | 3.5 mA | 1.7 mA | 4 mA | 2.5 mA |
Ключевые отличия
- Ultra-low input bias current of 1 pA (против AD8512ARZ)
- Wide bandwidth of 25 MHz (против ADA4610-2ARZ)
- Lower noise than OPA2134 (против OPA2134)
Заметки по проектированию
The AD8620ARZ operates from ±5V to ±13V supplies. Use 0.1 µF ceramic capacitors close to each supply pin (V+ and V-) to decouple high-frequency noise. For best performance, add 10 µF tantalum capacitors in parallel for bulk decoupling. Ensure the supply voltages are within the absolute maximum ratings to avoid damage.
For optimal 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 resistor and capacitor close to the inverting input to minimize stray capacitance. Avoid routing high-speed digital traces near the input pins.
Do not exceed the input common-mode voltage range, which extends to the negative rail but not beyond. The output can swing close to the rails, but avoid driving loads that require more than 30 mA. Ensure the junction temperature stays below 150°C by providing adequate thermal relief on the PCB. For high-impedance sources, use a guard ring around the input pins to reduce leakage currents.
Информация о соответствии
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
