ALD2321BPCL

Overview

The ALD2321BPCL is a dual precision CMOS analog voltage comparator manufactured by Advanced Linear Devices Inc. It utilizes EPAD® electronic-trimming technology to achieve ultra-low offset voltages and input bias currents, enabling the detection of signals as low as 4fW without external amplification. The device features separate push-pull outputs (Source and Sink) for flexible configuration, including open-drain or wired-OR modes. It operates on a single +5V supply or dual ±5V supplies within a 4V to 10V range. Key electrical parameters include a maximum input offset voltage of 0.5mV at 5V, typical input bias current of 0.01pA, and a typical response time of 300ns for TTL inputs.

Feature Summary

• Ultra-low signal power detection capability down to 4 femtowatts using integrated e-trim technology.
• Dual complementary output drivers allowing configurable push-pull, open-drain, or wired-OR connections.
• High-speed response with minimal delay even at very small overdrive voltages.
• CMOS, NMOS, and TTL compatible logic levels with high fanout capacity.

Applications

• Dual limit window comparators
• Power supply voltage monitoring
• Photo-detector sensor circuits
• Relay or LED driver interfaces
• Battery operated instruments

Procurement Notes

Verify that the ordering suffix 'PCL' corresponds to the 16-pin Plastic DIP package and lead-free composition as specified in the manufacturer's ordering information. Confirm that the component meets RoHS3 standards and check the specific temperature grade requirements against the datasheet specifications for the PCL package variant before finalizing procurement.

Selection Notes

Select this component when application requirements demand the resolution of extremely low-level signals directly from high-impedance sources without intermediate amplification stages. The dual complementary output architecture provides design flexibility for driving various load types, including relays and LEDs, while maintaining low supply current consumption suitable for battery-operated systems.

Part Context

The ALD2321BPCL belongs to the ALD2321 family of precision dual voltage comparators. This series is distinguished by its advanced silicon gate CMOS construction and factory-trimmed offset characteristics. The BPCL designation specifically identifies the B-grade version housed in a 16-pin plastic DIP package, offering a balance of high performance and standard through-hole packaging compatibility.

Replacement Considerations

Direct pin-compatible replacements within the same family include the ALD2321APCL and ALD2321PCL. These variants share identical pinouts and functionality but differ in their maximum input offset voltage specifications. Ensure the selected replacement meets the specific offset voltage tolerance required by the circuit design.

FAQ

How does the ALD2321BPCL handle input signals near ground potential?

The input voltage range includes ground, making it ideal for single-supply (+5V) or dual-supply (-5V) systems where signals are detected at or near zero volts without requiring level shifting.

What is the function of the VE pins on the ALD2321BPCL?

The VE pins (VE11, VE12, VE21, VE22) are used for factory trimming of the offset voltage. They can also be utilized as positive/negative feedback pins to introduce hysteresis if necessary.

Can the outputs of the ALD2321BPCL drive capacitive loads?

Yes, when driving capacitive loads, the output DC current levels remain at very low leakage levels, which serves as a power-saving feature while maintaining signal integrity.