ADA4505-1ARJZ-R2

Overview

The ADA4505-1ARJZ-R2 is a single-channel micropower operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output swings, operating from a single 1.8 V to 5 V supply or dual ±0.9 V to ±2.5 V supplies. 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 PSRR of 100 dB minimum. It is housed in a 5-lead SOT-23 package and supports an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Zero input crossover distortion achieved through an on-chip 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.
• Micropower consumption with less than 10 μA per amplifier, optimizing battery life in portable applications.
• High precision performance characterized by low offset voltage drift and high common-mode rejection ratio.

Applications

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

Procurement Notes

Verify component authenticity using official Analog Devices documentation. Confirm the specific ordering suffix matches the required package and reel specifications. Check for any product change notices or end-of-life announcements prior to finalizing procurement plans. Ensure compliance with environmental regulations such as RoHS standards applicable to the manufacturing region.

Selection Notes

Select this component when designing low-voltage, battery-powered instrumentation requiring high precision. The zero crossover distortion feature makes it suitable for applications where standard rail-to-rail amplifiers introduce unacceptable signal errors. Consider the 5-lead SOT-23 package for space-constrained designs. Evaluate the trade-off between the 50 kHz bandwidth and the ultra-low power consumption based on system requirements.

Part Context

This part belongs to the ADA4505 family of micropower amplifiers, which also includes dual (ADA4505-2) and quad (ADA4505-4) variants. The family shares similar electrical characteristics and circuit technologies but differs in channel count and packaging options. It is designed to address challenges in low-voltage battery operation, offering superior PSRR and CMRR compared to conventional CMOS op-amps.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing circuit designs if considering alternative components from other manufacturers.

FAQ

How does the ADA4505-1 eliminate crossover distortion?

It utilizes an on-chip charge pump to power the input differential pair, allowing the input stage to handle a wide range of input signal voltages without switching between differential pairs, thus preventing crossover distortion.

What is the maximum supply voltage for the ADA4505-1?

The absolute maximum supply voltage rating is 5.5 V. Normal operation is specified for single supplies from 1.8 V to 5 V or dual supplies from ±0.9 V to ±2.5 V.