ADM202JRW-REEL

Overview

The ADM202JRW-REEL is a dual 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 ±10 V output levels, requiring only 0.1 µF external capacitors. The device supports data rates up to 120 kBaud and features Schmitt trigger inputs for noise immunity. It includes overvoltage protection on receiver inputs up to ±30 V and ESD protection exceeding 2 kV. Packaged in a 16-lead Wide SOIC (R-16W), it functions within a commercial temperature range of 0 °C to 70 °C.

Feature Summary

• Integrates a highly efficient charge pump voltage converter to generate required RS-232 voltage swings from a single 5 V supply without external DC-DC components.
• Features Schmitt trigger receivers with hysteresis to ensure error-free reception of noisy signals or those with slow transition times.
• Provides robust input protection allowing receiver pins to withstand continuous voltages exceeding ±30 V while maintaining TTL/CMOS compatibility.

Applications

• Computer serial port interfaces
• Peripheral equipment connections
• Modem communication links

Procurement Notes

Verify the specific ordering suffix matches the required package style and tape/reel configuration. Confirm that the component version aligns with the intended operating temperature range and regulatory compliance standards before finalizing procurement orders.

Selection Notes

Select this component when a dual-channel RS-232 interface is required with minimal external capacitance. Ensure the design accommodates the 16-lead Wide SOIC footprint and provides adequate thermal dissipation for the specified power consumption levels under maximum load conditions.

Part Context

This part belongs to the ADM202/ADM203 family of high-speed CMOS RS-232 drivers and receivers. It serves as an enhanced successor to the AD230–AD241 series, offering improved power efficiency and latch-up protection while maintaining pin compatibility for many legacy designs.

Replacement Considerations

The ADM203 offers equivalent functionality but integrates all charge pump capacitors internally, eliminating the need for external components. Verify pinout compatibility if substituting between the ADM202 and ADM203 variants.

FAQ

What is the purpose of the internal pull-up resistor on the transmitter inputs?

An internal 400 kΩ pull-up resistor connects each TTL/CMOS input to VCC. This ensures that unused inputs are pulled high, forcing the corresponding outputs into a low state to prevent floating signal issues.

How does the device handle unconnected receiver inputs?

Receiver inputs feature an internal 5 kΩ pull-down resistor to ground. This guarantees that an unconnected input is interpreted as a low logic level, preventing false triggering due to noise.

What is the typical output voltage swing of the drivers?

With a nominal 5 V supply and a standard load, the drivers typically generate an output voltage swing of ±9 V, which exceeds the minimum ±5 V requirement of the EIA-232-E specification.