AD8620ARZ - Precision JFET Dual Op Amp | Analog Devices
MPN: AD8620ARZ ✓ NakahandaAD8620ARZ Ulas
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.
Mga alternatibo na pwedeng ilagay na AD8620ARZ — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok AD8620ARZ (parehas na form factor at footprint) — pagkakaiba sa Slew Rate, Amplifier Type, Gain Bandwidth Product, Current - Output / Channel, Current - Supply.
AD8620BRZ
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD8620ARZ-REEL7
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
ADA4610-2ARZ
✅ Drop-In ⚠️ Mga Talaan Hindi NaiwerikmoMagkontak para sa presyo
Tingnan ang Datasheet →OPA2134
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
AD8512ARZ
✅ Drop-In ⚠️ Mga Talaan Hindi NaiwerikmoMagkontak para sa presyo
Tingnan ang Datasheet →AD8620ARZ Mga Pinakamataas na Rating at Electrical Characteristics
| Amplifier Type | J-FET |
| Number of Circuits | 2 |
| Type ng Output | 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 |
| Temperature na Operasyon | -40°C to +125°C |
| Packhaging / Kaso | 8-SOIC (0.154", 3.90mm Width) |
| Uri ng Pagpapasok | Surface Mount |
| Tindminan RoHS | Compliant |
Pin Configuration ng AD8620ARZ
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply voltage |
| Pin 5 | +IN B — Non-inverting input of amplifier B |
| Pin 6 | -IN B — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | V+ — Positive supply voltage |
Tipikal na mga Gamit
AD8620ARZ ay nararapat para sa 6 aplikasyons: 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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for AD8620ARZ — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | 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 |
Pangunahing mga Pagkakaiba
- Ultra-low input bias current of 1 pA (kumpara saAD8512ARZ)
- Wide bandwidth of 25 MHz (kumpara saADA4610-2ARZ)
- Lower noise than OPA2134 (kumpara saOPA2134)
Talaan ng Disenyo
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.
Impormasyon ng Pagsunod sa Kautusan
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
