ADA4505-1ACBZ-RL

Overview

The ADA4505-1ACBZ-RL is a single-channel micropower operational amplifier from Analog Devices, featuring rail-to-rail input and output swings. It operates on a single supply of 1.8 V to 5 V or dual supplies of ±0.9 V to ±2.5 V. Key electrical parameters include a maximum offset voltage of 3 mV, typical input bias current of 0.5 pA, and supply current of 10 μA per amplifier. The device offers a gain-bandwidth product of 50 kHz, slew rate of 6 mV/µs, and minimum PSRR of 100 dB.

Feature Summary

• Zero input crossover distortion achieved through an internal charge pump technology that powers the input differential pair.
• Rail-to-rail input and output capability ensures full common-mode dynamic range without signal degradation near supply rails.
• Ultra-low power consumption with supply current under 10 μA per amplifier for extended battery life.
• High precision performance characterized by low offset voltage drift and minimal input bias current.

Applications

• Pulse oximeter red and infrared current sources
• Four-pole Butterworth filters in glucose meters
• Pressure and position sensors
• Remote security systems

Procurement Notes

Verify the specific package type and tape-and-reel configuration against the official ordering guide before procurement. Confirm temperature range specifications match the application environment requirements. Ensure compatibility with existing PCB footprints for the WLCSP package. Check for any recent revision updates in the datasheet that may affect pinout or electrical characteristics.

Selection Notes

Select this component for applications requiring high precision in low-voltage, battery-powered environments. The zero crossover distortion feature makes it suitable for signals swinging across the entire supply range. Consider the 6-ball WLCSP package for space-constrained designs. Evaluate the trade-off between the low bandwidth and the ultra-low power consumption based on system speed requirements.

Part Context

This part belongs to the ADA4505 family of micropower amplifiers, which includes single (ADA4505-1), dual (ADA4505-2), and quad (ADA4505-4) variants. The family shares core technologies such as the charge pump-based input stage and CMOS architecture. It is designed to address errors caused by battery voltage decay and rail-to-rail input distortion in portable instrumentation.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer's selection guide for alternative devices within the zero crossover distortion portfolio, such as the AD8505 series, while verifying pinout and electrical parameter compatibility.

FAQ

How does the ADA4505-1 eliminate crossover distortion?

It uses an on-chip charge pump to power the input differential pair, allowing the input voltage to vary from one supply extreme to the other without the need for a second differential pair that causes distortion.

What is the typical input bias current for this amplifier?

The typical input bias current is 0.5 pA, which remains very low across the operating temperature range.