AD8620BR-REEL

Overview

The AD8620BR-REEL is a dual-channel, 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 wide bandwidth (25 MHz gain-bandwidth product). The device operates on dual supplies ranging from ±5 V to ±13 V and is specified over an extended industrial temperature range of −40°C to +125°C. It offers fast settling times (600 ns to 0.01%) and high output drive capability, making it suitable for driving capacitive loads exceeding 1000 pF without external compensation.

Feature Summary

• JFET input architecture providing extremely low input bias current across the entire operating temperature range
• Unconditional stability with large capacitive loads, eliminating the need for external compensation components
• No phase reversal behavior when inputs are forced beyond the common-mode voltage range
• High output drive capability allowing operation with heavy resistive and capacitive loads

Applications

• Photodiode amplifiers
• Automated test equipment (ATE) signal conditioning
• Medical instrumentation including CAT, MRI, and ultrasound systems
• Fast precision integrator circuits
• High-performance audio applications

Procurement Notes

Verify that the ordering suffix matches the required package type and reel configuration. Confirm the specific grade (e.g., B-grade for tighter offset specifications) aligns with design requirements. Ensure the component is sourced from authorized distributors to guarantee authenticity and traceability. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component for designs requiring high precision combined with wide bandwidth and low noise. Consider the dual-channel configuration for space-constrained applications where two identical amplifiers are needed. Evaluate the supply voltage range to ensure compatibility with the system power rails. Account for PCB layout requirements to minimize leakage currents due to the ultra-low input bias current specification.

Part Context

The AD8620 is the dual-channel counterpart to the single-channel AD8610 within the same family of precision JFET amplifiers. Both devices share identical electrical characteristics and are fabricated using the XFCB process. The AD8620 provides two independent channels in an 8-lead SOIC package, whereas the AD8610 is available in both 8-lead SOIC and 8-lead MSOP packages.

Replacement Considerations

Direct functional substitutes include the AD8610 for single-channel applications or other parts within the AD86xx series. Verify pinout compatibility and package dimensions before substitution. Ensure that any replacement meets the specific offset voltage and bias current requirements of the original design.

FAQ

Is the AD8620 stable when driving large capacitive loads?

Yes, the AD8620 is unconditionally stable with capacitive loads well in excess of 1 nF and can safely drive up to 10 nF without external compensation.

Does the AD8620 exhibit phase reversal?

No, the AD8620 is designed to prevent phase reversal even when one or both inputs are forced beyond their input common-mode voltage range.

What is the maximum operating supply voltage?

The maximum operating supply voltage is specified at ±13 V, with an absolute maximum rating of 27.3 V total supply voltage.