AD8620ARZ - Precision JFET Dual Op Amp | Analog Devices
MPN： AD8620ARZ ✓ 啟用中AD8620ARZ 概覽
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.
直接替換替代品，適用於 AD8620ARZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD8620ARZ （相同外形與佔位） — 差異在於 Slew Rate, Amplifier Type, Gain Bandwidth Product, Current - Output / Channel, Current - Supply.
AD8620BRZ
✅ 直接替換📋 參考替代品（不在目錄中）
AD8620ARZ-REEL7
✅ 直接替換📋 參考替代品（不在目錄中）
ADA4610-2ARZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →OPA2134
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD8620ARZ 最大額定值與電氣特性
| Amplifier Type | J-FET |
| Number of Circuits | 2 |
| 輸出類型 | 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 |
| 工作溫度 | -40°C to +125°C |
| 封裝 / 外殼 | 8-SOIC (0.154", 3.90mm Width) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
AD8620ARZ 腳位配置
| 腳位 1 | OUT A — Output of amplifier A |
| 腳位 2 | -IN A — Inverting input of amplifier A |
| 腳位 3 | +IN A — Non-inverting input of amplifier A |
| 腳位 4 | V- — Negative supply voltage |
| 腳位 5 | +IN B — Non-inverting input of amplifier B |
| 腳位 6 | -IN B — Inverting input of amplifier B |
| 腳位 7 | OUT B — Output of amplifier B |
| 腳位 8 | V+ — Positive supply voltage |
典型應用
AD8620ARZ 適用於 6 應用s: 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.
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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.
推薦
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.
推薦
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.
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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.
推薦
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.
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推薦產品摘要
工程參考資料，適用於 AD8620ARZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Ultra-low input bias current of 1 pA (對比AD8512ARZ)
- Wide bandwidth of 25 MHz (對比ADA4610-2ARZ)
- Lower noise than OPA2134 (對比OPA2134)
設計說明
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.
合規資訊
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
