ADM238LJR

Overview

The ADM238LJR is a CMOS RS-232 line transceiver designed for single 5 V power supply operation. It integrates four drivers and four receivers, providing full EIA-232-E compliance without requiring external ±12 V supplies. The device utilizes internal charge pumps to generate the necessary voltage levels from a single 5 V input. Key electrical parameters include a data rate of 120 kbps, an output voltage swing of ±9 V under typical load conditions, and a maximum operating temperature of +85°C for the industrial grade variant. The component is housed in a 24-pin SOIC package.

Feature Summary

• Integrates dual charge pump converters to generate required RS-232 voltage levels from a single 5 V supply
• Features Schmitt trigger inputs on receivers to ensure noise immunity and error-free reception
• Includes internal pull-up and pull-down resistors on transmitter and receiver inputs respectively
• Provides latch-up protection and high noise immunity suitable for harsh environments

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific suffix 'J' indicates the commercial temperature range (0°C to 70°C) rather than the industrial range (-40°C to +85°C). Confirm the package type matches the required PCB footprint, as the datasheet lists both PDIP and SOIC options for the ADM238L family. Ensure ordering documentation explicitly states the manufacturer as Analog Devices Inc. to avoid counterfeit components.

Selection Notes

Select the ADM238LJR when a design requires four independent transmit and receive channels within a single IC. This part is appropriate for systems where space is limited compared to discrete solutions but does not require the low-power shutdown features found in the ADM236L or ADM241L variants. Verify that the system operates strictly within the 5 V supply constraints defined in the specifications table.

Part Context

The ADM238L is part of the ADM2xxL family, which serves as an enhanced upgrade to the older AD2xx series. This generation offers lower power consumption, faster slew rates, and compatibility with smaller 1 µF capacitors. Unlike the ADM236L, this specific model lacks a shutdown pin, making it suitable for applications where continuous operation is required without power-saving modes.

Replacement Considerations

Public confirmed substitute part numbers: ADM238LJRZ, ADM238LREZ.