ALD2721PB

Overview

The ALD2721PB is a dual monolithic rail-to-rail precision CMOS operational amplifier featuring integrated user-programmable EPAD offset voltage adjustment. It operates on a single supply of 2V to 10V or dual supplies of ±1V to ±5V, with a typical supply current of 200µA. Key electrical parameters include a bandwidth of 700KHz, a slew rate of 0.7V/µs, and an input bias current as low as 0.01pA. The device offers high open-loop gain and tolerance to over-voltage input spikes up to 300mV beyond the supply rails.

Feature Summary

• Integrates Electrically Programmable Analog Device (EPAD) technology for in-system programming of offset voltage without external components.
• Features rail-to-rail input and output voltage ranges suitable for low voltage applications.
• Provides extremely low input bias currents and high open-loop voltage gain for precision signal conditioning.
• Supports computer-assisted trimming to compensate for system-level errors such as PSRR, CMRR, and temperature drift.

Applications

• Sensor interface circuits
• Transducer biasing circuits
• Capacitive and charge integration circuits
• Biochemical probe interfaces
• Precision sample and hold amplifiers

Procurement Notes

Verify that the specific part number suffix corresponds to the 14-pin Plastic DIP package variant. Confirm the operating temperature range matches the application requirements, as this suffix typically denotes the commercial grade range. Ensure compatibility with standard EPAD programmers if in-system programming capabilities are required for the design.

Selection Notes

Select this component when high precision is required alongside micropower consumption in low voltage systems. The EPAD feature allows for post-assembly calibration, making it suitable for applications where external trimming potentiometers are impractical. Consider the limited offset voltage program range compared to the 'E' variant if extensive electrical trimming is necessary.

Part Context

This device belongs to the ALD2721 family of dual micropower CMOS operational amplifiers manufactured by Advanced Linear Devices. It shares architectural similarities with the ALD1721 but provides two independent channels in a single package. The PB suffix specifically identifies the 14-pin Plastic DIP package configuration within the broader product line.

Replacement Considerations

ALD2721EPB

FAQ

How does the EPAD technology function for offset voltage adjustment?

EPAD technology uses internal CMOS FETs as programmable in-circuit elements. Users can inject charge into these elements via specific pins (VE1A, VE2A, etc.) using a programmer to permanently store offset voltage adjustments, even after power-down.

What is the difference between the ALD2721 and ALD2721E variants?

The ALD2721E features a wider offset voltage program range compared to the standard ALD2721. Both devices offer similar performance characteristics, but the E variant is designed for applications requiring more extensive electrical offset voltage programming.