ADM234LAR

Overview

The ADM234LAR is a CMOS RS-232 line driver manufactured by Analog Devices Inc. It operates from a single 5 V power supply and integrates on-board dc-to-dc converters to generate the required ±10 V levels for EIA-232-E compliance. The device features four drivers and no receivers, supporting data rates up to 120 kbps with a typical output voltage swing of ±9 V. It utilizes small 1 µF external capacitors for charge pump operation and includes internal pull-up resistors on inputs. The component is available in industrial temperature ranges and standard SOIC packages.

Feature Summary

• Integrates dual charge pump voltage converters to enable single-supply operation without requiring external negative voltage sources.
• Provides four TTL/CMOS-to-RS-232 transmitter channels with internal pull-up resistors to simplify interface design.
• Features Schmitt trigger inputs on receiver channels (where applicable) and high noise immunity for reliable signal transmission.
• Complies with EIA-232-E and V.28 specifications while maintaining low power consumption through CMOS technology.

Applications

• Serial communication interfaces in computer systems
• Peripheral connectivity for printers and modems
• Industrial instrumentation requiring RS-232 signaling
• Battery-powered equipment utilizing single 5 V supplies

Procurement Notes

Verify the specific suffix 'L' indicates the low-power variant with 1 µF capacitor requirements and industrial temperature range capabilities. Confirm package type matches the required pin count and footprint. Ensure ordering documentation aligns with the manufacturer's current revision status to guarantee compatibility with existing designs.

Selection Notes

Select this component when a design requires multiple transmit channels but no receive functionality within an RS-232 interface. It is suitable for applications where space constraints limit the use of larger capacitors or where a single 5 V supply is the only available power source. Compare against other family members if receiver channels or shutdown modes are necessary.

Part Context

The ADM234LAR belongs to the ADM2xxL family of enhanced CMOS RS-232 transceivers. This series improves upon the older AD2xx family by offering lower power dissipation, faster slew rates, and the ability to operate with smaller 1 µF capacitors. The 'L' designation specifically denotes these low-power characteristics and extended temperature performance options.

Replacement Considerations

ADM234ARZ serves as a direct functional equivalent within the same product family, sharing identical electrical specifications and pinout configurations. Verify that any replacement part maintains the same package dimensions and thermal characteristics to ensure mechanical compatibility in existing assemblies.