ALD2702APAL

Overview

The ALD2702APAL is a dual monolithic CMOS operational amplifier from Advanced Linear Devices, housed in an 8-pin PDIP package. It features rail-to-rail input and output voltage ranges, making it suitable for +5V single supply or ±5V dual supply systems. Key electrical parameters include a unity gain bandwidth of 1.5 MHz, a slew rate of 1.9 V/µs, and typical input bias current below 1 pA. The device offers high voltage gain (typically 85 V/mV at ±2.5V) and low offset voltage drift (<7 µV/°C). Operating temperature range is 0°C to +70°C.

Feature Summary

• Rail-to-rail input and output voltage ranges allow implementation of numerous analog serial stages without losing operating voltage margin.
• Extremely low input bias currents (less than 1.0pA typical) make the device ideal for high source impedance applications.
• Internally compensated for unity gain stability with more than 70 degrees of phase margin, eliminating the need for external frequency compensation.
• Robust design includes output short circuit protection and suitability for operation in temperature-extreme environments.

Applications

• Voltage follower/buffer
• Photodiode amplifier
• Data acquisition systems
• Active filters
• Picoammeter

Procurement Notes

Verify that the specific part number suffix 'PAL' corresponds to the 8-pin Plastic DIP package and lead-free (RoHS) compliance as indicated by the ordering information. Confirm the operating temperature range requirements match the 0°C to +70°C specification for this package variant. Ensure static control procedures are followed during handling due to ESD sensitivity.

Selection Notes

Select the ALD2702APAL when a dual precision op-amp with rail-to-rail capabilities is required for 5V systems. Its low input bias current and high input resistance minimize signal distortion from high source impedance sensors. The internal compensation simplifies design by ensuring stability in unity gain configurations without external components.

Part Context

The ALD2702 series includes variants like ALD2702ASAL (SOIC) and ALD2702ADA (CERDIP). The ALD2702APAL specifically denotes the plastic DIP package version. The 'L' suffix indicates lead-free construction. The device is fabricated using silicon gate CMOS technology designed for mixed digital/analog 5V power supply applications.

Replacement Considerations

Direct substitutes may include other dual rail-to-rail CMOS op-amps with similar pinouts and electrical characteristics. Verify compatibility regarding input bias current, bandwidth, and package dimensions before substitution.

FAQ

Does the ALD2702APAL require external frequency compensation?

No, the device is internally compensated for unity gain stability using a novel scheme, providing more than 70 degrees of phase margin at the unity gain frequency.

What is the maximum load capacitance the ALD2702APAL can drive?

In a non-inverting unity gain connection, it can typically drive up to 400pF of external load capacitance. In the inverting unity gain configuration, it can drive up to 800pF.

How does the ALD2702APAL handle common mode input voltages near the supply rails?

It uses complementary p-channel and n-channel input differential stages connected in parallel to accomplish rail-to-rail input common mode voltage range. One stage switches off internally when the voltage is close to the supplies, but this does not affect many standard amplifier configurations.