ALD2321PCL

Overview

The ALD2321PCL is a monolithic dual precision voltage comparator utilizing advanced silicon gate CMOS technology. It features integrated dual complementary output drivers and on-chip e-trim technology for ultra-low offset voltage. The device operates with a supply voltage range of 4V to 10V, supporting both single (+5V) and dual (±5V) power configurations. Key electrical characteristics include a typical input bias current of 0.01pA, a maximum offset voltage of 0.2mV for the ALD2321B variant, and a typical response time of 300ns for TTL inputs. It provides high-speed detection for low-level signals without requiring external amplification stages.

Feature Summary

• Ultra-low signal power detection capability down to 4 femtowatts
• Integrated electronic trimming for minimal input offset voltage
• Dual complementary outputs enabling flexible push-pull or open-drain configurations
• High input impedance virtually eliminating source impedance effects

Applications

• Dual limit window comparators
• Power supply voltage monitoring
• Photo-detector sensor circuits
• Battery operated instruments
• Remote signal detection

Procurement Notes

Verify the specific suffix designation when ordering. The 'L' suffix indicates a lead-free version. Confirm the temperature grade required for the application, as the PCL package is rated for 0°C to +70°C. Ensure that the E-Trim pins are handled according to layout guidelines to prevent noise coupling.

Selection Notes

Select the ALD2321A, B, or standard ALD2321 based on the required offset voltage specification. The ALD2321B offers tighter offset voltage limits compared to the standard version. Consider the output drive requirements; the sink output can handle up to 50mA, suitable for direct relay or LED driving. Verify compatibility with CMOS, NMOS, and TTL logic levels if interfacing with digital systems.

Part Context

This component belongs to the ALD2321 family of precision analog voltage comparators manufactured by Advanced Linear Devices. The family includes variants with different offset voltage grades and packaging options such as SOIC, DIP, and CERDIP. These devices are designed for applications requiring high sensitivity and fast response times in low-power environments.

Replacement Considerations

Direct replacements must match the dual comparator architecture and CMOS input characteristics. Check for equivalent offset voltage specifications and output drive capabilities. Verify pinout compatibility, particularly regarding the complementary output structure and E-Trim pins, before substituting.