ADM208ARZ

Overview

The ADM208ARZ is a CMOS RS-232 line driver and receiver manufactured by Analog Devices Inc. It operates from a single +5 V power supply, utilizing internal charge pumps to generate the required ±10 V levels for EIA-232-E compliance. The device integrates four drivers and four receivers, supporting data rates up to 120 kB/s with an output voltage swing of ±9 V under typical loading. It functions within an industrial temperature range of -40°C to +85°C and consumes approximately 13 mA of supply current at 5 V. The component is housed in a 24-lead Wide Body SOIC package (Option RW-24) and requires four external capacitors ranging from 0.1 μF to 10 μF for the on-board DC-to-DC converters.

Feature Summary

• Integrates two internal charge pump voltage converters to generate ±10 V supplies from a single 5 V input.
• Features Schmitt-trigger inputs on receivers to ensure error-free reception in noisy environments.
• Includes internal pull-up resistors on transmitter inputs and pull-down resistors on receiver inputs.
• Provides high noise immunity through built-in hysteresis on the receiver stages.

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify that the ordering suffix matches the specific package requirement, as the 'ARZ' designation indicates a 24-lead Wide Body SOIC package. Confirm RoHS compliance status if restricted materials are a constraint. Ensure the procurement channel sources directly from authorized distributors or the manufacturer to guarantee authenticity and traceability of the Analog Devices component.

Selection Notes

Select this part when a full-duplex interface with four drivers and four receivers is required without shutdown functionality. Unlike the ADM206 or ADM211, the ADM208 lacks low-power shutdown and enable pins, making it suitable for always-on applications. Verify that the system does not require active monitoring during sleep modes, as all receivers disable upon power loss or lack of control signals.

Part Context

The ADM208ARZ belongs to the ADM2xx family of RS-232 transceivers designed for EIA-232-E and V.28 interfaces. This family allows operation from a single digital 5 V supply, eliminating the need for external negative voltage rails. The ADM208 specifically provides a symmetric configuration of four drivers and four receivers, differing from the ADM207 which adds a fifth receiver.

Replacement Considerations

The datasheet notes that the ADM2xx family is essentially plug-in compatible with the older AD2xx family derivatives. Designers replacing legacy components should verify pinout compatibility and electrical specifications against the original AD2xx part number before substitution.