ADM232AARN

Overview

The ADM232AARN 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 four external 0.1 µF capacitors to generate the required bipolar voltage levels. The device contains 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 accepting input levels up to ±30 V. Fabricated on BiCMOS technology, it minimizes quiescent current while maintaining high performance. The component is housed in a 16-lead narrow SOIC package (R-16) and supports an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates on-board DC-DC converters using small external capacitors for efficient level shifting.
• Features Schmitt trigger inputs on receivers to ensure error-free reception of noisy signals.
• Includes internal pull-up resistors on transmitter inputs and pull-down resistors on receiver inputs.

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify that the ordering suffix matches the required package type and reel configuration. Confirm RoHS compliance status if environmental regulations apply to the assembly process. Ensure the specific variant corresponds to the narrow SOIC package format required by the design footprint.

Selection Notes

Select this component when a pin-compatible upgrade for legacy AD232 or ADM232L designs is needed. It is suitable for applications requiring full duplex communication without shutdown functionality. Consider alternative family members like the ADM222 or ADM242 if enable or shutdown control features are necessary for the system architecture.

Part Context

This part belongs to the ADM222/ADM232A/ADM242 family of high-speed CMOS RS-232 drivers and receivers. It serves as a direct replacement for older ADI RS-232 interfaces, offering improved speed and lower power consumption. The family shares similar internal architectures but varies in pin counts and control functions such as shutdown and enable capabilities.

Replacement Considerations

Pin-compatible alternatives include the ADM232AANZ and ADM232AARW. Verify package dimensions and lead pitch compatibility before substitution. Check if additional features like shutdown pins are required, which may necessitate selecting the ADM222 or ADM242 variants instead.

FAQ

Does the ADM232AARN support shutdown mode?

No, the ADM232AARN does not have a shutdown function. Only the ADM222 and ADM242 variants in this family include shutdown capabilities.

What is the maximum input voltage the receivers can tolerate?

The receivers can accept RS-232 signal levels up to ±30 V without damage.

Are internal pull-up resistors present on the transmitter inputs?

Yes, each TTL/CMOS transmitter input has an internal 400 kΩ pull-up resistor connected to VCC.