ADM234LAN

Overview

The ADM234LAN is a single-supply CMOS RS-232 transceiver from Analog Devices, designed for EIA-232-E and V.28 interfaces without requiring negative voltage rails. It integrates four drivers and zero receivers, utilizing internal charge pumps to generate ±10 V supplies from a single +5 V input. The device supports data rates up to 120 kbps with an output voltage swing of ±9 V under typical loading. It operates within the commercial temperature range of 0°C to 70°C and requires four external 1 µF capacitors for the voltage converters.

Feature Summary

• Integrates four TTL/CMOS-to-RS-232 drivers on a single chip
• Eliminates need for dual polarity power supplies via internal charge pumps
• Includes Schmitt trigger inputs on receivers for noise immunity (applicable to family)
• Features low power shutdown mode in compatible variants

Applications

• Computers and peripheral connections
• Modems and printers
• Instruments and industrial control systems

Procurement Notes

Verify the 'L' suffix indicates the enhanced low-power CMOS version compared to legacy parts. Confirm the 'A' suffix specifies the industrial temperature range (-40°C to +85°C), whereas the datasheet lists the standard commercial range (0°C to 70°C) for the base model. Ensure the package type matches the required pin count and footprint for the design.

Selection Notes

Select this part when four serial transmit channels are needed without receiving capabilities. It is suitable for applications where board space is limited due to the integration of charge pumps. Compare against ADM232L if only two drivers are sufficient, or ADM233L if no external capacitors are desired. Verify supply voltage compatibility with the single +5 V requirement.

Part Context

The ADM234LAN belongs to the ADM2xxL family of line drivers/receivers, which serves as an enhanced upgrade to the AD2xx series. This family focuses on lower power consumption, faster slew rates, and operation with smaller capacitors. The specific 'L' designation denotes the low-power CMOS technology used throughout the series.

Replacement Considerations

ADM232L: Offers two drivers instead of four. ADM233L: Requires no external capacitors but has different pinout. ADM236L: Includes receivers and shutdown functionality. Verify pin compatibility and functional requirements before substitution.