ADM237LAQ

Overview

The ADM237LAQ 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 two internal charge pump converters to generate ±10 V levels, requiring four external 1 µF capacitors. The device provides five drivers and three receivers with full-duplex operation. Key electrical parameters include a 120 kbps data rate, ±9 V output swing, and a typical operating current of 13 mA at 5 V. It operates within an industrial temperature range of -40°C to +85°C and lacks low-power shutdown or enable functions.

Feature Summary

• Integrates dual charge pump voltage converters for single-supply operation
• Provides five independent transmitter drivers and three receiver channels
• Features Schmitt trigger inputs with hysteresis for noise immunity
• Includes internal pull-up resistors on driver inputs and pull-down resistors on receiver inputs

Applications

• Industrial control systems requiring multiple serial ports
• Computer peripherals and modems
• Instruments and printers with RS-232 connectivity

Procurement Notes

Verify the 'A' suffix indicates the industrial temperature grade (-40°C to +85°C) per Analog Devices standards. Confirm package availability in PDIP-24 or CERDIP formats. Check for RoHS compliance status as manufacturing processes evolve. Ensure ordering documentation matches the specific ADM237LAQ designation to avoid confusion with similar family members lacking five drivers.

Selection Notes

Select this component when five transmit lines are required without shutdown control. Compare against ADM236L if power management features are needed, or ADM238L if four receive lines are necessary. Verify that the 13 mA quiescent current fits the system budget, as this model lacks the low-power shutdown mode found in other family variants. Ensure PCB space allows for four external capacitors.

Part Context

The ADM237LAQ belongs to the ADM2xxL enhanced series, which improves upon the legacy AD2xx family with lower power consumption and faster slew rates. It shares the same pinout and functional architecture as the ADM237L but specifies the industrial temperature range variant. This part is part of a comprehensive line of single-supply RS-232 transceivers designed to replace traditional dual-supply solutions.

Replacement Considerations

ADM237LJNZ serves as a direct equivalent within the same family. Cross-reference with ADM237LANZ for lead-free packaging options. Verify compatibility with MAX237CNG+ or MAX237ENG+ only if pin-to-pin and functional equivalence is confirmed by manufacturer substitution guides.