AD8620ARZ

Overview

The AD8620ARZ is a dual precision JFET input operational amplifier manufactured by Analog Devices Inc. It features ultralow offset voltage (100 μV maximum), very low input bias current (10 pA maximum), and low noise (6 nV/√Hz). The device operates on dual supplies ranging from ±5 V to ±13 V, with a gain bandwidth product of 25 MHz and a slew rate up to 60 V/μs. It settles to 0.01% accuracy in under 600 ns and is stable with capacitive loads exceeding 1000 pF. The component is housed in an 8-lead narrow SOIC package.

Feature Summary

• JFET input architecture providing extremely low input bias current across the entire operating temperature range
• High-speed dynamic performance with fast settling time and high output drive capability for driving heavy loads
• Unconditional stability in all gains, including operation with large capacitive loads without external compensation
• No phase reversal when inputs are forced beyond the common-mode voltage range

Applications

• Photodiode amplifiers
• Automated test equipment (ATE) amplification and buffering
• Medical instrumentation such as CAT, MRI, and ultrasound systems
• Fast precision integrators and high-performance filters
• High-quality audio circuits

Procurement Notes

Verify that the ordering suffix matches the required package type, as the AD8620 is exclusively available in the 8-lead narrow SOIC format. Confirm the specific grade if offset voltage requirements exceed standard specifications. Ensure the procurement source provides documentation confirming compliance with RoHS standards and the extended industrial temperature range of -40°C to +125°C.

Selection Notes

Select this component for applications requiring high precision combined with wide bandwidth and low power consumption. It is suitable for driving high-performance ADC inputs and buffering DAC outputs. Consider its superior capacitive load driving capability compared to similar amplifiers. Verify that the supply voltage range aligns with system requirements, as it is specified for dual supplies between ±5 V and ±13 V.

Part Context

The AD8620 is part of the AD8610/AD8620 family, which utilizes the XFCB process technology. This manufacturing method combines dielectrically isolated N-channel JFETs with thin-film resistors to achieve high precision and speed. The family offers unconditionally stable operation and low power consumption, making it distinct from competitive JFET amplifiers that may suffer from increased bias currents at elevated temperatures.

Replacement Considerations

The AD8610 serves as the single-channel counterpart within the same family. Designers should verify pin compatibility and electrical specifications when substituting components. No other direct substitute part numbers are confirmed in the provided documentation.