ADA4505-4ACBZ-RL

Overview

The ADA4505-4ACBZ-RL is a quad micropower CMOS 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 7 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 14-ball WLCSP package (CB-14-1) with dimensions of 1.46 mm x 2.96 mm.

Feature Summary

• Zero input crossover distortion achieved via an on-chip charge pump that powers the input differential pair, eliminating signal distortion at common-mode transitions.
• Rail-to-rail input and output capability ensures full common-mode dynamic range without phase reversal across the entire supply voltage span.
• High power supply rejection ratio (PSRR) and common-mode rejection ratio (CMRR) minimize errors caused by battery voltage fluctuations over time.

Applications

• Battery-powered consumer equipment
• Remote security systems
• Medical monitors
• Pressure and position sensors

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering suffix matches the required packaging format. Check for end-of-life status or alternative sourcing options as availability may vary. Ensure compliance with RoHS directives and environmental regulations relevant to your region before finalizing procurement decisions.

Selection Notes

Select this component when low quiescent current and high precision are critical for battery-operated designs. The quad configuration reduces board space compared to individual amplifiers. Verify that the 50 kHz bandwidth meets the signal frequency requirements. Consider the thermal resistance characteristics of the WLCSP package for heat dissipation in dense layouts.

Part Context

This part belongs to the ADA4505 family of zero crossover op amps, which includes single (ADA4505-1) and dual (ADA4505-2) variants. The family shares identical electrical specifications but differs in channel count and physical package options. The ACBZ suffix indicates the extended industrial temperature range (-40°C to +125°C) and the specific WLCSP packaging.

Replacement Considerations

Direct substitutes within the same family include ADA4505-1ACBZ-RL and ADA4505-2ACBZ-RL, though channel counts differ. Cross-family alternatives like AD8505 series offer similar performance but may have different noise or speed characteristics. Verify pin compatibility and thermal requirements when considering replacements.

FAQ

How does the ADA4505-4 eliminate crossover distortion?

It uses an on-chip charge pump to power the input differential pair, allowing it to handle wide input voltage ranges without switching between differential pairs, thus preventing distortion.

What is the typical input bias current for this amplifier?

The typical input bias current is 0.5 pA, which increases to 375 pA at the maximum operating temperature of +125°C.