ADM222ARZ

Overview

The ADM222ARZ is a high-speed, single-supply RS-232 driver and receiver manufactured by Analog Devices Inc. It operates from a single +5 V power supply and integrates on-board DC-DC converters to generate the required bipolar voltage levels for RS-232 communication. The device supports transmission rates up to 200 kB/s and includes two drivers and two receivers. It utilizes small 0.1 µF external capacitors for its charge pump circuitry. The component meets EIA-232-E and V.28 specifications and features a shutdown function that reduces supply current to 0.1 µA when disabled. It is housed in an 18-lead Standard Small Outline Package (RW-18) and operates within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates on-board DC-DC converters to generate bipolar RS-232 voltages from a single 5 V supply.
• Includes a shutdown pin that disables all transmit and receive functions to minimize power consumption.
• Features internal pull-up resistors on TTL/CMOS inputs and pull-down resistors on RS-232 inputs.
• Provides Schmitt trigger inputs on receivers to ensure noise immunity and error-free reception.

Applications

• Computer serial port interfaces
• Peripheral equipment connections
• Modem data transmission links
• Printer interface circuits
• Industrial instrument communication

Procurement Notes

Verify the package option RW-18 matches the design footprint requirements. Confirm the suffix Z indicates RoHS compliance if environmental standards are mandatory. Ensure the operating temperature range of -40°C to +85°C aligns with the intended application environment. Check for specific ordering suffixes like REEL if tape-and-reel packaging is required for assembly processes.

Selection Notes

Select this component when a single 5 V supply is available and low quiescent current is critical during idle periods due to the shutdown capability. It serves as a direct replacement for older AD232 derivatives and offers pin compatibility with MAX222/MAX232A/MAX242 families. Consider the 18-lead package availability if space constraints favor surface-mount technologies over DIP packages.

Part Context

The ADM222ARZ belongs to the ADM222/ADM232A/ADM242 family of high-speed CMOS RS-232 transceivers. This family represents an enhancement over the earlier AD230-AD241 series, offering improved speed and lower power consumption while maintaining functional compatibility. The ARZ designation specifically identifies the 18-lead wide body SOIC package variant within this product line.

Replacement Considerations

The datasheet explicitly states pin compatibility with MAX222, MAX232A, and MAX242 devices. Designers replacing legacy AD232 or ADM232L components can utilize this part as a drop-in upgrade without modifying the surrounding circuit topology or capacitor values.