ADM238LAR-REEL

Overview

The ADM238LAR-REEL is a CMOS RS-232 transceiver from the ADM2xxL family, designed for EIA-232-E and V.28 interfaces using a single 5 V supply. It integrates four drivers and four receivers with on-board DC-to-DC converters generating ±10 V rails. The device supports data rates up to 120 kbps and operates within a temperature range of -40°C to +85°C (Industrial grade). Key electrical parameters include a typical output voltage swing of ±9 V at 5 V supply, a maximum power supply current of 13 mA, and an input logic threshold high of 2.0 V. It utilizes small 1 µF external capacitors and features latch-up-free construction.

Feature Summary

• Integrates internal charge pump voltage converters to enable operation from a single 5 V digital supply without requiring external ±12 V sources.
• Provides full duplex communication through four independent drivers and four receivers compatible with TTL/CMOS logic levels.
• Features Schmitt trigger inputs on receivers to ensure noise immunity and error-free reception in noisy environments.
• Includes internal pull-up resistors on transmitter inputs and pull-down resistors on receiver inputs to define states when unconnected.

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific suffix 'AR' indicates the Industrial temperature grade (-40°C to +85°C) and 'REEL' denotes tape-and-reel packaging. Confirm RoHS compliance status as specified in the manufacturer's ordering guide. Ensure the source document matches the Rev C datasheet for accurate pinout and electrical specifications before integration into designs.

Selection Notes

Select this component when a single 5 V supply is available but RS-232 signaling is required. It is suitable for applications needing four transmit and receive channels. Unlike the ADM236L or ADM241L, this part lacks a shutdown mode, making it less ideal for battery-powered systems requiring ultra-low standby power. Verify that the load capacitance does not exceed 2500 pF for optimal slew rate performance.

Part Context

The ADM238L is part of the enhanced ADM2xxL family, serving as an upgrade to the older AD2xx series with lower power consumption and faster slew rates. It shares the same 24-pin package footprint as other members like the ADM236L and ADM237L, facilitating potential board-level upgrades. The device is manufactured by Analog Devices Inc. and is intended for general-purpose serial communication interfaces.

Replacement Considerations

Public confirmed substitute part numbers: ADM238LAN, ADM238LARZ.