ADM237LAR

Overview

The ADM237LAR is a CMOS RS-232 transceiver from the Analog Devices ADM2xxL family, designed for single 5 V operation. It integrates five drivers and three receivers with internal charge pumps generating ±10 V supplies using four external 1 µF capacitors. The device supports full-duplex communication at data rates up to 120 kbps. It operates within an industrial temperature range of -40°C to +85°C and accepts a supply voltage of 5 V ± 5%. The component lacks low power shutdown or enable functions and features Schmitt trigger inputs with hysteresis.

Feature Summary

• Integrates dual charge pump converters to generate required RS-232 voltages from a single 5 V supply
• Features Schmitt trigger receiver inputs providing noise immunity and error-free reception on slow signals
• Includes internal pull-up resistors on transmitter inputs to prevent undefined states when unconnected

Applications

• Industrial control systems requiring robust serial communication
• Instrumentation equipment operating in electrically noisy environments
• Peripheral interface modules connecting microprocessors to RS-232 ports

Procurement Notes

Verify the specific package variant corresponding to the 'AR' suffix against the manufacturer's ordering guide. Confirm that the selected version meets the required industrial temperature specifications and pinout compatibility before finalizing procurement orders.

Selection Notes

Select this component when five independent transmit channels are required alongside three receive channels. Ensure the design accommodates four external capacitors for the charge pumps. This part is suitable for applications needing high noise immunity but does not support low power shutdown modes found in other family members.

Part Context

The ADM237LAR belongs to the ADM2xxL enhanced series, offering lower power consumption and faster slew rates compared to the legacy AD2xx family. It provides a comprehensive solution for EIA-232-E interfaces without requiring external 12 V supplies, simplifying board layout for standard digital logic systems.

Replacement Considerations

The ADM238L offers identical pinouts and functionality but includes four receivers instead of three. Verify if the additional receiver channel is necessary or if the exact five-driver configuration is strictly required for the application.