ADM234LAQ

Overview

The ADM234LAQ is a single-supply CMOS RS-232 transceiver from Analog Devices, designed for EIA-232-E and V.28 interfaces without requiring external ±12 V supplies. It integrates four drivers and zero receivers within a 16-pin package. The device operates on a single 5 V supply (±10%) and utilizes internal charge pumps to generate the necessary voltage levels. Key electrical parameters include a data rate of 120 kbps, an output voltage swing of ±9 V under typical conditions, and receiver input protection up to ±30 V. The component supports commercial temperature ranges and features low power consumption with shutdown capabilities in related family members.

Feature Summary

• Integrates internal DC-to-DC converters to enable operation from a single 5 V power supply
• Provides four TTL/CMOS-to-RS-232 transmitter channels for signal driving
• Includes Schmitt trigger inputs on receivers to ensure noise immunity and error-free reception
• Features internal pull-up resistors on driver inputs to simplify interface connections

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific suffix 'LAQ' against the manufacturer's official ordering guide to confirm the exact package type and temperature grade. Ensure compatibility with the required PCB footprint for the identified package style. Confirm that the single 5 V supply requirement aligns with the system design constraints.

Selection Notes

Select this component when a single 5 V supply is available and multiple transmission lines are needed without receiving capability. Compare against the ADM232L if two receivers are required, or the ADM233L if space savings from integrated capacitors are prioritized. Verify that the 120 kbps data rate meets the application requirements.

Part Context

The ADM234L belongs to the ADM2xxL family of enhanced RS-232 drivers and receivers. This series improves upon the legacy AD2xx family by offering lower power consumption, faster slew rates, and the ability to operate with smaller 1 µF capacitors. The L-series designation indicates these enhancements over earlier generations.

Replacement Considerations

Public confirmed substitute part numbers: None found.