AD8620ARZ - Precision JFET Dual Op Amp | Analog Devices
MPN: AD8620ARZ ✓ פעילAD8620ARZ סקירה
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.
חלופות תחליף ישיר עבור AD8620ARZ — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם AD8620ARZ (אותו גורם צורה וטביעת רגל) — שונים ב Slew Rate, Amplifier Type, Gain Bandwidth Product, Current - Output / Channel, Current - Supply.
AD8620BRZ
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD8620ARZ-REEL7
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADA4610-2ARZ
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←OPA2134
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
AD8512ARZ
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←AD8620ARZ דירוגים מרביים ומאפיינים חשמליים
| Amplifier Type | J-FET |
| Number of Circuits | 2 |
| סוג פלט | 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 |
| טמפרטורת פעולה | -40°C to +125°C |
| מארז / Case | 8-SOIC (0.154", 3.90mm Width) |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant |
תצורת פינים של AD8620ARZ
| פין 1 | OUT A — Output of amplifier A |
| פין 2 | -IN A — Inverting input of amplifier A |
| פין 3 | +IN A — Non-inverting input of amplifier A |
| פין 4 | V- — Negative supply voltage |
| פין 5 | +IN B — Non-inverting input of amplifier B |
| פין 6 | -IN B — Inverting input of amplifier B |
| פין 7 | OUT B — Output of amplifier B |
| פין 8 | V+ — Positive supply voltage |
יישומים טיפוסיים
AD8620ARZ מתאים עבור 6 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור AD8620ARZ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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 |
מבדילים עיקריים
- Ultra-low input bias current of 1 pA (לעומתAD8512ARZ)
- Wide bandwidth of 25 MHz (לעומתADA4610-2ARZ)
- Lower noise than OPA2134 (לעומתOPA2134)
הערות תכנון
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.
מידע על תאימות
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
