ADM232AARW

Overview

The ADM232AARW 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 to generate the required bipolar voltage levels for RS-232 communication. The device features two drivers and two receivers, supporting transmission rates up to 200 kB/s. It meets all EIA-232-E and V.28 specifications, including ±9 V output swing and ±30 V receiver input protection. The component is housed in a 16-lead wide body SOIC (RW-16) package and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates on-board DC-DC converters to generate RS-232 voltage levels from a single 5 V supply using small external capacitors.
• Provides full duplex communication with two independent drivers and two receivers.
• Includes internal pull-up resistors on TTL/CMOS inputs and pull-down resistors on RS-232 inputs to manage unused pins.
• Features Schmitt trigger inputs on receivers to ensure noise immunity and error-free reception.

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific ordering suffix to confirm the package type and compliance status. The 'W' suffix indicates the 16-lead Standard Small Outline Package Wide Body (RW-16). Ensure the procurement matches the required RoHS compliant version if applicable, typically denoted by a 'Z' suffix in other variants, though standard availability should be confirmed with the distributor.

Selection Notes

Select this component when a pin-compatible upgrade to older AD232 or ADM232L devices is required without adding shutdown functionality. Unlike the ADM222 or ADM242, the ADM232A lacks enable or shutdown pins, making it suitable for always-on applications. Verify that the system requires only two channels and does not need bus sharing capabilities provided by the EN pin found in the ADM242.

Part Context

The ADM232AARW belongs to the ADM222/ADM232A/ADM242 family of high-speed CMOS RS-232 drivers/receivers. This family shares core electrical characteristics but differs in control features. The ADM232A serves as the baseline model for dual-channel operation, while the ADM222 adds a shutdown function and the ADM242 adds both shutdown and enable functions for bus management.

Replacement Considerations

Publicly documented pin-compatible substitutes include the MAX222, MAX232A, and MAX242. When replacing, verify that the substitute part number matches the specific control requirements, such as the presence or absence of SHDN and EN pins, which vary across the family members.

FAQ

Does the ADM232AARW support a shutdown mode?

No, the ADM232A does not have a shutdown (SHDN) pin. Only the ADM222 and ADM242 variants in this family include shutdown functionality to reduce power consumption.

What is the maximum data rate supported by this device?

The ADM232A supports transmission rates up to 200 kB/s.

How are unused TTL/CMOS inputs handled?

Unused transmitter inputs have an internal 400 kΩ pull-up resistor to VCC, which forces the outputs into a low state. Unused receiver inputs have an internal 5 kΩ pull-down resistor to ground.