ADM2209EARUZ

Overview

The ADM2209EARUZ is a dual-port RS-232 transceiver in a 38-lead TSSOP package. It integrates six drivers and ten receivers, supporting data rates up to 460 kbps under standard loads and 920 kbps with reduced capacitance. The device operates from a single +12 V supply (VDD range: +10.8 V to +13.2 V) and includes an internal charge pump to generate the required negative voltage rail. A separate standby supply (VSTBY range: +3.15 V to +5.5 V) powers two specific receivers (R5A and R5B), enabling system wake-up capabilities while minimizing power consumption.

Feature Summary

• Dual serial port integration providing six drivers and ten receivers on a single chip
• Internal DC-to-DC converter eliminates the need for external negative power supplies
• Standby mode maintains active receiver monitoring for peripheral communication detection
• High-level electromagnetic compatibility including ESD protection exceeding -15 kV

Applications

• Desktop and portable personal computers
• Peripheral devices requiring RS-232 connectivity
• Modems and industrial control systems

Procurement Notes

Verify the component revision and package marking against the official Analog Devices datasheet to confirm authenticity. Ensure that the ordering suffix corresponds to the specified temperature range and packaging format. Cross-reference the manufacturer part number with authorized distributor catalogs to validate current availability status before finalizing procurement plans.

Selection Notes

Select this component when a single-chip solution for two full RS-232 ports is required without external negative voltage generation. Verify that the application environment supports the specified operating temperature range of -40°C to +85°C. Confirm that the system design can accommodate the necessary external charge pump capacitors and that the standby logic levels match the connected microcontroller or processor interface.

Part Context

This component belongs to the ADM2209E series of rugged line transceivers designed by Analog Devices. It is specifically engineered to meet EIA/TIA-232-E specifications while offering enhanced immunity to electrical noise and transient events compared to standard interface ICs.

Replacement Considerations

Direct pin-compatible replacements are not explicitly documented in the provided source material. Evaluate alternative dual-port RS-232 transceivers based on driver/receiver counts, voltage requirements, and EMC compliance ratings if substitution is necessary.

FAQ

How does the standby feature function?

When the main VDD supply is removed, the device enters standby mode. During this state, the internal oscillator stops, but the R5 receivers on both ports remain active via the VSTBY supply, allowing the system to detect incoming signals and wake up.

What is the maximum data rate supported?

The device guarantees a data rate of 460 kbps under standard load conditions. With reduced load capacitance (150 pF) and specific voltage tolerances, it can support rates up to 920 kbps.

Does the device require a negative power supply?

No, the ADM2209EARUZ contains an onboard charge pump that generates the necessary negative voltage rail from the single positive +12 V supply, eliminating the need for a separate negative power source.