ALD2706APAL

Overview

The ALD2706APAL is a dual monolithic CMOS micropower operational amplifier manufactured by Advanced Linear Devices, Inc. It features rail-to-rail input and output voltage ranges, making it suitable for low-voltage single or dual supply systems ranging from +2V to +10V single supply or ±1V to ±5V dual supplies. The device offers a unity gain bandwidth of 200kHz, a slew rate of 0.1V/µs, and extremely low input bias currents typically at 0.1pA. Designed with an enhanced ACMOS silicon gate process, it provides high open-loop voltage gain and is specified for operation within a temperature range of 0°C to +70°C in the 8-pin plastic DIP package.

Feature Summary

• Rail-to-rail input and output voltage capability allows signal voltages to equal positive and negative supply rails, facilitating flexible input biasing and serial analog stages.
• Extremely low input bias current of 0.1pA ensures minimal distortion of analog signals from high source impedance sensors.
• Internally compensated for unity gain stability using a novel scheme without nulling resistors, providing clean frequency response and phase margin.
• Robust design includes full static discharge protection and minimized latch-up susceptibility for rugged environments.

Applications

• Voltage follower and buffer circuits
• Photodiode amplifiers
• Charge integrators
• Data acquisition systems
• Picoammeters

Procurement Notes

Verify the specific suffix 'PAL' corresponds to the 8-pin Plastic DIP package and lead-free (RoHS) compliance as indicated in the ordering information. Confirm that the operating temperature range aligns with the 0°C to +70°C specification for this package variant. Ensure the application voltage requirements fall within the +2V to +10V single supply or ±1V to ±5V dual supply limits defined in the datasheet.

Selection Notes

Select the ALD2706APAL when designing circuits requiring ultra-low power consumption alongside rail-to-rail signal handling capabilities. It is appropriate for battery-operated systems where supply voltages are limited. Consider its high input impedance for interfacing with high-impedance sources like photodiodes. Note that internal switching occurs near the positive supply rail; ensure common mode voltages do not exceed this threshold if offset stability is critical in unity gain configurations.

Part Context

The ALD2706 series includes variants such as ALD2706ASAL (SOIC), ALD2706ADA (CERDIP), and their B-grade counterparts. These devices share identical electrical characteristics but differ in package type and operating temperature ranges. The ALD2706APAL specifically denotes the plastic DIP version intended for general-purpose analog applications in standard commercial temperature ranges.

Replacement Considerations

Direct pin-compatible replacements include other dual rail-to-rail CMOS op-amps with similar micropower specifications. Verify that any substitute maintains the 0.1pA input bias current and 200kHz bandwidth. Ensure the replacement supports the required supply voltage range and operates within the 0°C to +70°C environment if the package remains unchanged.

FAQ

How does the rail-to-rail input feature affect offset voltage in unity gain buffers?

Internal switching between p-channel and n-channel differential stages occurs approximately 1.5V below the positive supply. In unity gain buffers, this switching can cause input offset voltage variations; designers should account for this if precise offset performance is required near the upper supply rail.

What is the maximum capacitive load the ALD2706APAL can drive?

The output stage is designed to typically drive up to 25pF of capacitive load while maintaining stability, combined with resistive loads up to 20kΩ.