ADA4691-4ACPZ-RL

Overview

The ADA4691-4ACPZ-RL is a quad, low-power, rail-to-rail output operational amplifier from Analog Devices. It features a 3.6 MHz gain bandwidth product and a typical supply current of 180 μA per amplifier. The device offers very low input bias currents (0.5 pA typical) and low voltage noise density (16 nV/√Hz). It operates on single supplies from 2.7 V to 5 V or dual supplies from ±1.35 V to ±2.5 V. The quad version includes dual shutdown pins for power management. It is housed in a 16-lead LFCSP package and specified over an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Quad configuration with dual independent shutdown pins controlling pairs of amplifiers
• Rail-to-rail output capability optimized for low-voltage single-supply operation
• Very low input bias current suitable for high-impedance sensor interfaces
• Low distortion and low noise performance for precision signal conditioning

Applications

• Photodiode amplifiers
• Portable audio devices such as MP3 players and smartphones
• ADC drivers and active filters
• Low-side current sense circuits

Procurement Notes

Verify the specific ordering suffix RL indicates reel packaging when sourcing. Confirm the LFCSP-16 package dimensions match your PCB footprint requirements. Ensure the design supports the required logic levels for the shutdown control pins. Check for moisture sensitivity handling instructions during assembly. Validate that the supply voltage remains within the 2.7 V to 5 V range for optimal performance.

Selection Notes

Select this component when multiple channels are needed in a compact form factor. The dual shutdown feature allows for significant power reduction compared to non-shutdown variants. Consider the 16-lead LFCSP package for space-constrained designs. Evaluate the trade-off between the 3.6 MHz bandwidth and the ultra-low power consumption. Ensure the application benefits from the rail-to-rail output swing near the supply rails.

Part Context

This part belongs to the ADA4691 family, which distinguishes itself by including shutdown functionality unlike the ADA4692 series. The quad variant provides four independent amplifiers in a single package. It complements other low-power op-amps by offering higher bandwidth while maintaining microampere-level current consumption. The family is designed for portable applications requiring precision and battery life.

Replacement Considerations

The ADA4692-4ACPZ-RL is a direct functional substitute if shutdown capability is not required. Verify pin compatibility and package dimensions before substitution. Performance differences exist primarily in power-down current and control logic.