ALD1706BPAL

Overview

The ALD1706BPAL is a monolithic CMOS ultra micropower operational amplifier featuring rail-to-rail input and output capabilities. It operates on dual supplies from ±1V to ±5V or single supplies from +2V to +10V, with a maximum supply current of 40 µA at 5V. Key electrical characteristics include a typical input bias current of 1 pA, a unity gain bandwidth of 0.7 MHz, and a slew rate of 0.7 V/µs. The device offers high open-loop voltage gain of 100 V/mV and includes internal offset voltage trimming. It is housed in an 8-pin Plastic DIP package and supports resistive loads down to 10 kΩ.

Feature Summary

• Rail-to-rail input and output voltage ranges enable full signal swing near supply rails.
• Extremely low input bias current of 1 pA typical ensures minimal loading on high-impedance sources.
• Internally compensated for unity gain stability without requiring external frequency compensation components.
• On-chip offset voltage trimming eliminates the need for external nulling circuits in most applications.

Applications

• Photodiode amplifiers
• Charge integrators
• Picoammeters
• High-performance portable instruments
• Active filters

Procurement Notes

Verify that the specific part number suffix 'PAL' corresponds to the 8-pin Plastic DIP package variant. Confirm RoHS compliance status as indicated by the 'L' suffix designation. Ensure the application environment remains within the specified operating temperature range of 0°C to +70°C for this package type. Check for static discharge protection requirements during handling.

Selection Notes

Select this component when designing battery-operated systems requiring low power dissipation and high input impedance. It is suitable for mixed digital-analog environments sharing a common power supply. Consider the 0.7 V/µs slew rate for signal fidelity requirements. Verify that the source impedance does not exceed limits that would degrade noise performance due to the high input resistance.

Part Context

This device belongs to the ALD1706 family of ultra micropower rail-to-rail CMOS operational amplifiers manufactured by Advanced Linear Devices. The family includes variants such as ALD1706A, ALD1706B, and ALD1706G, which differ primarily in input offset voltage specifications. The ALD1706BPAL specifically denotes the B-grade offset version in the PDIP-8 package.

Replacement Considerations

Direct substitutes within the same family include ALD1706APAL and ALD1706GPAL. These share identical pinouts and general functionality but may exhibit different input offset voltage tolerances. Ensure the replacement meets the specific precision requirements of the original design.

FAQ

Does the ALD1706BPAL require external frequency compensation?

No, the device is internally compensated for unity gain stability and does not require external compensation components.

What is the maximum capacitive load the output can drive?

The output stage can typically drive up to 25 pF of capacitive load while maintaining stability.

How does the rail-to-rail feature benefit single-supply operation?

It allows the signal input and output voltages to extend close to or equal the positive and negative supply rails, maximizing dynamic range in low-voltage battery systems.