ALD2701BPAL

Overview

The ALD2701BPAL is a dual monolithic CMOS micropower operational amplifier manufactured by Advanced Linear Devices. 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 or ±1V to ±5V. The device offers high open-loop voltage gain of up to 100 V/mV, unity gain stability, and extremely low input bias currents typically at 1.0 pA. It operates within an ambient temperature range of 0°C to +70°C and is housed in an 8-pin Plastic DIP package.

Feature Summary

• Rail-to-rail input and output voltage capability allows signal levels to reach the positive and negative supply rails.
• Extremely low input bias current of 1.0 pA typical value supports high source impedance applications.
• Internally compensated for unity gain stability without requiring external nulling resistors.
• Output short circuit protection ensures robust operation under fault conditions.

Applications

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

Procurement Notes

Verify that the specific part number suffix 'PAL' corresponds to the 8-pin Plastic DIP package variant with the standard commercial operating temperature range of 0°C to +70°C. Confirm RoHS compliance status if required, as leaded versions may exist under different ordering suffixes. Ensure the application environment remains within the specified electrical limits for supply voltage and load capacitance.

Selection Notes

Select this component when designing circuits that require rail-to-rail performance on low voltage supplies such as battery-operated devices. The micropower consumption makes it ideal for portable instruments where energy efficiency is critical. Consider the 1.0 pA input bias current for interfacing with high-impedance sensors like photodiodes. Verify that the 0.7 V/µs slew rate meets the dynamic signal requirements of the target application.

Part Context

The ALD2701 series includes variants A, B, and generic types, differentiated primarily by offset voltage specifications. The ALD2701BPAL specifically denotes the B-grade version packaged in an 8-pin PDIP format. This family utilizes enhanced ACMOS silicon gate process technology to achieve a balance between micropower operation and high slew rate performance compared to older industry standard op-amps.

Replacement Considerations

The datasheet notes compatibility with the µA741 and ICL7621 pin configurations. However, direct replacement requires verifying that the substitute component supports the required rail-to-rail input/output swing and low voltage operation capabilities of the ALD2701BPAL.

FAQ

Does the ALD2701BPAL require external compensation?

No, the device is internally compensated for unity gain stability using a novel scheme that does not utilize a nulling resistor.

What is the maximum capacitive load the output can drive?

The output stage can typically drive up to 50pF of capacitive load while maintaining stability.