ADM203JN

Overview

The ADM203JN is a dual-channel RS-232 line driver and receiver pair designed for single 5 V power supply operation. It integrates an on-chip charge pump to generate ±10 V output levels, eliminating the need for external capacitors. The device supports transmission rates up to 120 kBaud and meets EIA-232-E and V.28 specifications. Key electrical parameters include a typical output voltage swing of ±9 V, a maximum VCC power supply current of 6.0 mA, and a propagation delay of 5 µs. The receiver inputs feature overvoltage protection capable of withstanding continuous voltages exceeding ±30 V.

Feature Summary

• Integrated charge pump eliminates requirement for external capacitors
• Single 5 V power supply operation with low power consumption
• Receiver inputs protected against overvoltages exceeding ±30 V

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the ordering suffix JN corresponds to the N-20 plastic DIP package and the commercial temperature range of 0°C to 70°C. Confirm that the component matches the specific pinout and internal capacitor integration described in the official Analog Devices datasheet for the ADM203 series.

Selection Notes

Select this component when external charge pump capacitors must be avoided to save board space or reduce BOM complexity. It serves as a direct replacement for legacy AD230–AD241 family devices. Ensure the application requires a single 5 V supply and standard RS-232 signaling levels compatible with TTL/CMOS logic interfaces.

Part Context

The ADM203 is part of the ADM202/ADM203 family of high-speed CMOS RS-232 drivers and receivers. While the ADM202 requires external 0.1 µF capacitors for its charge pump, the ADM203 variant incorporates these components internally. This design simplifies circuit layout while maintaining compatibility with standard RS-232 interface requirements.

Replacement Considerations

The ADM203 is essentially plug-in compatible with the AD230–AD241 family and derivatives thereof.

FAQ

Does the ADM203 require external capacitors for the charge pump?

No, the ADM203 has all charge pump capacitors (C1 to C4) molded into the package, so no external capacitors are required.

What is the input threshold characteristic of the receivers?

The receivers have Schmitt trigger inputs with a hysteresis level of 0.5 V to ensure error-free reception of noisy signals or slow transition times.

How does the device handle unused transmitter inputs?

Unused transmitter inputs may be left unconnected because an internal 400 kΩ pull-up resistor pulls them high, forcing the outputs into a low state.