AD234JR

Overview

The AD234JR is a CMOS RS-232 transceiver designed for single-supply 5 V operation. It integrates charge pump circuitry to generate the necessary positive and negative voltages for RS-232 signal levels, eliminating the need for external dual supplies. The device features two drivers and two receivers, providing full compliance with EIA/TIA-232-F and ITU-T V.28 standards. It supports data rates up to 120 kbps and includes protection against output short circuits.

Feature Summary

• Single 5 V power supply operation
• Integrated charge pump for voltage generation
• Two drivers and two receivers
• Short-circuit protected outputs

Applications

• Industrial control systems requiring serial communication
• Modem interfaces in embedded devices
• Point-of-sale terminals
• Medical equipment with serial ports

Procurement Notes

Verify the specific suffix 'JR' corresponds to the 8-pin SOIC package and commercial temperature range (-40°C to +85°C) as defined by Analog Devices. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations prior to integration. Ensure pinout compatibility with existing board layouts referencing standard RS-232 transceiver footprints.

Selection Notes

Select this component when a single 5 V supply is available and dual rails are undesirable. It serves as a drop-in replacement for older MC1488/MC1489 combinations or ADM202/ADM203 variants where space savings from integrated charge pumps are critical. Compare propagation delay specifications against system timing requirements for reliable data integrity at maximum baud rates.

Part Context

The AD234 belongs to the ADM2xx family of low-power RS-232 transceivers from Analog Devices. This series focuses on simplifying interface design by integrating charge pumps directly onto the silicon die. The JR variant specifically denotes the plastic small-outline package suitable for surface-mount assembly processes common in modern consumer and industrial electronics manufacturing.

Replacement Considerations

Direct functional equivalents include the ADM202ARZ and ADM203ARZ for similar 5V single-supply applications. Verify that substitute components maintain identical pin configurations and electrical characteristics regarding drive strength and receiver sensitivity to ensure seamless interoperability within existing serial communication architectures.