ALD4706APBL

Overview

The ALD4706APBL is a quad monolithic CMOS ultra micropower operational amplifier manufactured by Advanced Linear Devices. It features rail-to-rail input and output voltage ranges, making it suitable for low-voltage systems. The device operates on a single supply of +2V to +10V or dual supplies of ±1V to ±5V. Key electrical parameters include a unity gain bandwidth of 200 kHz, a slew rate of 0.17 V/µs, and a maximum total supply current of 200 µA at 5V. Input bias current is typically 0.1 pA, with an input offset voltage of up to 10 mV. It is housed in a 14-pin Small Outline Plastic DIP (SOIC) package.

Feature Summary

• Rail-to-rail input and output voltage ranges allow signal voltages to operate near the power supply rails.
• Ultra micropower operation provides extremely low supply current consumption suitable for battery-powered applications.
• High input impedance with typical input bias currents of 0.1 pA minimizes loading effects on high-impedance sources.
• Unity gain stable design ensures stability without external compensation components.

Applications

• Voltage follower and buffer circuits
• Photodiode amplifiers
• Data acquisition systems
• Active filters
• Picoammeters

Procurement Notes

Verify that the specific part number suffix matches the required package type and temperature range. Confirm RoHS compliance status if lead-free construction is mandatory for the assembly process. Ensure the ordering code corresponds to the correct pinout configuration for the target PCB layout. Check for any specific handling requirements related to electrostatic discharge sensitivity during procurement and storage.

Selection Notes

Select this component when designing analog circuits requiring low power consumption and compatibility with single-supply or low-voltage dual-supply systems. The rail-to-rail capability makes it ideal for maximizing dynamic range in portable instruments. Consider the 200 kHz bandwidth and 0.17 V/µs slew rate for applications involving moderate-speed signal processing. Verify that the source impedance remains within limits to maintain the specified low input bias current performance.

Part Context

The ALD4706 series belongs to the family of quad CMOS operational amplifiers from Advanced Linear Devices. These devices are designed as alternatives to standard bipolar or JFET input op-amps where lower power and wider common-mode input ranges are required. The ALD4706APBL specifically denotes the SOIC package variant intended for commercial temperature operation.

Replacement Considerations

The datasheet notes compatibility with industry-standard pin configurations found in LM324 and ICL7641 types. Designers should verify pinout alignment before substitution. Electrical characteristics such as bandwidth and slew rate differ significantly from these legacy parts, requiring circuit re-evaluation.

FAQ

What is the maximum operating supply voltage for the ALD4706APBL?

The absolute maximum supply voltage is 10.6V. For normal operation, the device supports single supplies up to 10V or dual supplies up to ±5V.

Does the ALD4706 require external frequency compensation?

No, the ALD4706 is internally compensated for unity gain stability using a novel scheme that does not require external nulling resistors or capacitors.

How does the rail-to-rail input feature affect offset voltage?

The device uses parallel P-channel and N-channel differential stages. Internal switching occurs approximately 1.5V below the positive supply, which may cause offset voltage variations in unity gain buffer configurations near the upper rail.