ADM234LARZ

Overview

The ADM234LARZ is a CMOS RS-232 line transceiver from Analog Devices, designed for EIA-232-E and V.28 communications interfaces using a single 5 V power supply. It integrates four drivers and zero receivers, utilizing internal charge pumps to generate the required ±10 V levels from the 5 V input. The device supports data rates up to 120 kbps with an output voltage swing of ±9 V under typical loading. It operates within an industrial temperature range of -40°C to +85°C and is housed in a 16-pin SOIC package.

Feature Summary

• Integrates four TTL/CMOS-to-RS-232 drivers with on-board DC-to-DC converters
• Operates from a single 5 V supply without requiring external components other than capacitors
• Features Schmitt trigger inputs on receivers for noise immunity (not applicable as no receivers present)
• Includes internal pull-up resistors on driver inputs to simplify unused pin handling

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific suffix 'L' indicates the industrial temperature grade (-40°C to +85°C) rather than commercial grade. Confirm the 'ARZ' designation corresponds to the RoHS-compliant lead-free 16-pin SOIC wide body package. Cross-reference the manufacturer's ordering guide to ensure availability matches current production status.

Selection Notes

Select this component when an interface requires multiple transmission channels but no reception capability. The absence of receivers distinguishes it from similar parts like the ADM232L or ADM238L. Ensure the application does not require low-power shutdown modes, as this specific variant lacks SD and EN control pins found in the ADM236L or ADM241L.

Part Context

This part belongs to the ADM2xxL family, which serves as an enhanced upgrade to the older AD2xx series. Key improvements include lower power consumption, faster slew rates, and compatibility with smaller 1 µF capacitors. Unlike the ADM231L and ADM239L, this model generates both positive and negative supplies internally from a single 5 V source.

Replacement Considerations

Public confirmed substitute part numbers: ADM232LARZ, ADM238LARZ.