ADM237LJRZ

Overview

The ADM237LJRZ is a CMOS RS-232 transceiver from Analog Devices, designed for single 5 V operation. It integrates five drivers and three receivers within a 24-pin SOIC package. The device supports data rates up to 120 kbps and generates internal ±9 V output swings using onboard dc-to-dc converters with small 1 µF capacitors. It operates within a supply voltage range of 4.75 V to 5.25 V and consumes 13 mA at no load. The component functions in full duplex mode across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates onboard dc-to-dc converters to generate required RS-232 voltages from a single 5 V supply
• Features Schmitt trigger inputs on receivers to ensure error-free reception in noisy environments
• Includes internal pull-up resistors on transmitter inputs and pull-down resistors on receiver inputs
• Provides protection against receiver input overvoltages up to ±30 V

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific suffix 'JRZ' corresponds to the SOIC-24 package and industrial temperature grade (-40°C to +85°C) as defined by Analog Devices. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors before procurement. Ensure the ordering information matches the exact pinout and electrical specifications required for the design.

Selection Notes

Select this component when a system requires five independent transmit channels and three receive channels. It is suitable for applications needing high noise immunity due to integrated hysteresis. Verify that the PCB layout accommodates four external 1 µF capacitors for the charge pump circuitry. Ensure the design does not require a low-power shutdown mode, as this feature is absent in the ADM237L.

Part Context

The ADM237L belongs to the ADM2xxL family of enhanced CMOS RS-232 drivers and receivers. This series offers lower power consumption and faster slew rates compared to previous generations. Unlike the ADM236L, it lacks a shutdown control pin but provides additional driver capacity. It serves as a bridge between TTL/CMOS logic levels and standard RS-232 signaling requirements.

Replacement Considerations

Publicly confirmed substitute part numbers include MAX237CNG+ and MAX237ENG+. These alternatives offer similar functional characteristics and pin configurations.