ADM238LJN

Overview

The ADM238LJN is a single-supply CMOS RS-232 transceiver from Analog Devices, designed for EIA-232-E and V.28 communication interfaces. It integrates four drivers and four receivers within a 24-pin PDIP package. The device operates on a single 5 V supply (4.5 V to 5.5 V) with an internal charge pump generating ±10 V levels. Key electrical parameters include a data rate of 120 kbps, a typical supply current of 13 mA, and an output voltage swing of ±9 V. It functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates dual DC-to-DC converters to generate required RS-232 voltage levels from a single 5 V source
• Provides full duplex communication with four independent drivers and four receivers
• Features Schmitt trigger inputs on receivers to ensure noise immunity and error-free reception

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific suffix 'JN' against the manufacturer's ordering guide to confirm the industrial temperature grade (-40°C to +85°C) and PDIP-24 package type. Ensure compatibility with existing PCB footprints and check for RoHS compliance status in the latest datasheet revision before finalizing procurement.

Selection Notes

Select this component when a system requires four transmit and receive channels without external power supplies. It is suitable for applications where board space is limited compared to older AD2xx series parts. Verify that the load capacitance does not exceed 2500 pF to maintain the specified slew rate and data integrity at 120 kbps.

Part Context

This part belongs to the ADM2xxL family, which serves as an enhanced upgrade to the legacy AD2xx series. The L-series offers lower power consumption, faster slew rates, and the ability to operate with smaller 1 µF capacitors. Unlike the ADM236L or ADM241L, the ADM238L lacks a low-power shutdown mode but retains the core benefits of single-supply operation.

Replacement Considerations

The ADM238LN is the commercial temperature version of this component. For pin-compatible upgrades requiring shutdown functionality, consider the ADM236L. Legacy replacements include the AD238, though it may require larger external capacitors.