ADM202EARUZ-REEL

Overview

The ADM202EARUZ-REEL is a dual-channel RS-232 transceiver manufactured by Analog Devices Inc. It operates from a single 5 V power supply (4.5 V to 5.5 V) and supports data rates up to 230 kbps. The device features ±15 kV ESD protection on all I/O lines, complying with IEC1000-4-2 standards. It utilizes an internal charge-pump DC-to-DC converter requiring four external 0.1 µF capacitors to generate the necessary voltage levels. Packaged in a 16-lead TSSOP, it functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Complies with EU EMC directive 89/336/EEC for low electromagnetic emissions
• Provides robust protection against electrostatic discharge up to ±15 kV
• Features Schmitt-trigger receivers with hysteresis for noise immunity
• Includes internal pull-down resistors on receiver inputs

Applications

• General-purpose RS-232 data links
• Portable instruments
• Personal Digital Assistants (PDAs)

Procurement Notes

Verify the component matches the specific ordering suffix RUZ for the TSSOP package configuration. Confirm that the reel packaging aligns with automated assembly requirements. Ensure the revision level corresponds to Rev. C specifications. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity before integration into production systems.

Selection Notes

Select this component when upgrading legacy MAX202E or ADM232L designs requiring enhanced EMI performance. It is suitable for applications needing high-speed transmission up to 230 kbps without external voltage generation circuits. Consider the TSSOP package size if board space is limited compared to standard SOIC options. Verify compatibility with existing PCB footprints designed for 16-lead narrow packages.

Part Context

This device belongs to the ADM202E family, serving as a robust upgrade for older RS-232 transceivers like the ADM202 and LT1181A. It maintains pin compatibility while offering superior electromagnetic interference immunity. The series is designed for harsh electrical environments where cable plugging and unplugging are frequent. It represents a modern CMOS implementation of traditional charge-pump RS-232 interfaces.

Replacement Considerations

ADM202EARNZ

FAQ

What is the function of the internal pull-down resistors?

Each RS-232 receiver input contains an internal 5 kΩ pull-down resistor to ground. This ensures that unconnected inputs default to a Logic 1 output level, preventing floating states.

How does the device handle electromagnetic interference?

The ADM202E minimizes EMI through controlled slew rates on transmitter outputs and break-before-make switching in the charge pump. It complies with EN55022 conducted and radiated emission limits without additional filtering.

What capacitor values are required for operation?

Four external 0.1 µF capacitors are recommended for the charge-pump circuit. Larger capacitors up to 47 µF can be used for C1 through C4 to facilitate substitution with older generation devices.