AD8625AR

Overview

The AD8625AR is a quad precision JFET input operational amplifier manufactured by Analog Devices Inc. It features true single-supply operation with a supply voltage range of 5 V to 26 V, or dual supplies from ±2.5 V to ±13 V. The device offers rail-to-rail output capability and maintains stability with capacitive loads exceeding 500 pF. Key electrical specifications include a maximum offset voltage of 500 µV, an input bias current of 1 pA, and a gain-bandwidth product of 5 MHz. Supply current is typically 630 µA per amplifier. The component operates within an industrial temperature range of −40°C to +85°C.

Feature Summary

• JFET input stage providing ultra-low input bias current for minimal signal loading
• Rail-to-rail output swing maximizing dynamic range in single-supply systems
• True single-supply operation allowing inputs to extend below the negative rail
• Unity gain stable design ensuring reliable performance across various configurations

Applications

• Photodiode transimpedance amplification
• ATE reference level drivers
• Battery management systems
• Remote sensor signal conditioning including automotive sensors
• Precision active filters

Procurement Notes

Verify the specific package suffix (R-8 for SOIC) against the required footprint. Confirm that the ordering code matches the quad configuration. Ensure environmental compliance requirements align with the datasheet specifications. Check for any specific handling precautions related to the JFET input sensitivity during assembly.

Selection Notes

Select this component when low input bias current and high input impedance are critical. The rail-to-rail output makes it suitable for buffering wide-swing devices like DACs. Consider the 5 MHz bandwidth for applications requiring faster settling times compared to older single-supply JFET amplifiers. Verify power dissipation limits if driving heavy loads near the supply rails.

Part Context

The AD8625AR belongs to the AD862x family of precision low-power single-supply JFET amplifiers. This series includes the AD8626 (dual) and AD8627 (single). The AD8625 specifically provides four independent amplifiers in a 14-lead SOIC package. The family shares common characteristics such as low noise, low offset, and high common-mode rejection ratios.

Replacement Considerations

Direct pin-compatible substitutes within the same family include the AD8626AR and AD8627AR, depending on channel count requirements. Cross-family replacements should be evaluated based on matching supply voltage ranges, input bias current specifications, and package dimensions.