AD8513AR

Overview

The AD8513AR is a quad precision JFET operational amplifier from Analog Devices, designed for high-impedance sensor amplification and precise current measurements. It features low offset voltage (400 μV max), very low input bias current (25 pA typical at ±15 V), and low noise (8 nV/√Hz). The device offers fast settling time (500 ns to 0.1%) and operates on dual supplies ranging from ±5 V to ±15 V. It maintains stability with substantial capacitive loads and avoids output phase reversal when inputs exceed the common-mode range.

Feature Summary

• Very low input bias current suitable for high impedance sources
• Fast settling time with excellent stability under capacitive loads
• No output phase reversal when input voltages exceed common-mode limits

Applications

• Instrumentation
• Multipole filters
• Precision current measurement
• Photodiode amplifiers
• Sensors

Procurement Notes

Verify the specific grade (A or B) required for offset voltage specifications, as performance varies between grades. Confirm the package suffix matches the desired footprint (SOIC_N vs TSSOP). Ensure supply voltages remain within the ±5 V to ±15 V operating range to maintain specified electrical characteristics across the full temperature spectrum.

Selection Notes

Select this component for applications requiring low noise and high input impedance. The quad configuration reduces board space compared to single units. Consider the A grade for tighter offset voltage tolerances if system accuracy demands it. Verify thermal resistance requirements for the chosen package type in enclosed environments.

Part Context

This part belongs to the AD8510/AD8512/AD8513 family of precision, very low noise, low input bias current JFET operational amplifiers. While the AD8510 is a single and AD8512 is a dual, the AD8513 provides four amplifiers in one package. All share identical electrical characteristics regarding speed, noise, and precision.

Replacement Considerations

Direct substitutes include other quad JFET op-amps with similar low bias current and bandwidth specifications. Verify pinout compatibility and package dimensions before swapping. Check that replacement parts offer comparable phase margin and capacitive load drive capabilities.