ADM232AAN

Overview

The ADM232AAN is a high-speed RS-232 line driver and receiver manufactured by Analog Devices Inc. It operates from a single 5 V power supply and utilizes an internal charge pump with external capacitors to generate the required bipolar voltage levels. The device features two drivers and two receivers, supporting transmission rates up to 200 kB/s. It meets EIA-232-E and V.28 specifications, providing ±9 V output swing and ±30 V receiver input levels. The component is housed in a 16-lead Plastic Dual In-Line Package (N-16) and supports an industrial operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates on-board DC-DC converters using small external capacitors to develop RS-232 bipolar levels from a single 5 V supply.
• Provides full duplex communication capability with two independent drivers and two receivers on a single chip.
• Features Schmitt trigger inputs on receivers to ensure error-free reception for noisy signals or slow transition times.

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify that the ordering suffix matches the required package type. The 'AN' designation indicates a 16-lead Plastic Dual In-Line Package (N-16). Confirm compliance requirements such as RoHS status if applicable to the specific revision. Ensure the supplier provides documentation verifying the component's authenticity and traceability before finalizing procurement.

Selection Notes

Select this component when a pin-compatible upgrade for legacy AD232 or ADM232L designs is required. It is suitable for applications needing high-speed data transfer up to 200 kB/s without requiring shutdown functionality. Verify that the system design accommodates the four external 0.1 µF capacitors necessary for the internal charge pump operation.

Part Context

The ADM232AAN belongs to the ADM222/ADM232A/ADM242 family of high-speed CMOS RS-232 drivers and receivers. This series represents an enhancement over the earlier AD230-AD241 family, offering improved performance while maintaining plug-in compatibility. The ADM232A specifically lacks the shutdown and enable pins found in the ADM222 and ADM242 variants, simplifying the interface for standard point-to-point connections.

Replacement Considerations

The datasheet confirms pin compatibility with MAX222, MAX232A, and MAX242 devices. Designers replacing older AD232 or ADM232L components can utilize the ADM232AAN as a direct functional upgrade within the same package constraints.

FAQ

Does the ADM232AAN include a shutdown function?

No, the ADM232A does not contain a shutdown (SHDN) pin. Only the ADM222 and ADM242 models in this family feature shutdown capabilities to minimize power consumption.

What is the typical quiescent power supply current?

The typical quiescent power supply current is under 5 mA, although the maximum specification listed is 8 mA with no load.

How are unused TTL/CMOS inputs handled?

Unused transmitter inputs may be left unconnected because each input has an internal 400 kΩ pull-up resistor to VCC, which forces the outputs into a low state.