ADM202EARU-REEL7

Overview

The ADM202EARU-REEL7 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 voltage converter requiring four external 0.1 µF capacitors to generate the necessary ±10 V levels for RS-232 signaling. The component is housed in a 16-lead TSSOP package and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Compliant with EU EMC directive 89/336/EEC, ensuring low electromagnetic emissions and high immunity.
• Integrated robust transient protection circuitry providing resistance to electrostatic discharge and electrical fast transients.
• Utilizes CMOS technology to minimize power dissipation while maintaining high transmission speeds.
• Features Schmitt-trigger receiver inputs with hysteresis to ensure error-free reception of noisy signals.

Applications

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

Procurement Notes

Verify that the ordering suffix RU-REEL7 corresponds to the TSSOP-16 package and tape-and-reel packaging format. Confirm the specific revision level matches the design requirements, as specifications are subject to change without notice. Ensure compatibility with existing PCB footprints designed for the standard 16-lead TSSOP outline.

Selection Notes

Select this component when upgrading legacy MAX202E or ADM232E designs requiring enhanced EMI/EMC performance. It serves as a pin-compatible replacement for older generation charge-pump RS-232 transceivers. Consider the internal 5 kΩ pull-down resistors on receiver inputs when designing interface circuits to handle unconnected states effectively.

Part Context

This part belongs to the ADM202E family, which includes variants like the ADM202EARUZ. The ADM202E series represents a robust, high-speed upgrade to standard RS-232 interfaces, offering improved noise immunity compared to traditional devices. It is functionally similar to the ADM1181A but differs in specific internal capacitor configurations for the charge pump.

Replacement Considerations

Publicly confirmed substitute part numbers include ADM202EARUZ and ADM202EARNZ. These parts share the same core functionality and pinout but may differ in packaging type or reel configuration.

FAQ

What is the purpose of the internal 5 kΩ pull-down resistors?

The internal 5 kΩ pull-down resistors on each RS-232 input ensure that unconnected inputs or those connected to ground result in a Logic 1 output level, preventing undefined states.

How does the device achieve EMC compliance?

The device complies with EMC directives through controlled slew rates on transmitter outputs to minimize radiated emissions and integrated protection structures that handle ESD and fast transients without degradation.

Can larger capacitors be used for the charge pump?

Yes, while 0.1 µF capacitors are recommended for C1 through C4, larger capacitors up to 47 µF can be used to facilitate direct substitution with older generation charge-pump RS-232 transceivers.