ADM202EANZ

Overview

The ADM202EANZ is a dual-channel RS-232 line driver and receiver manufactured by Analog Devices Inc. It operates from a single 5 V power supply (4.5 V to 5.5 V) with a typical quiescent current of 6 mA under no-load conditions. The device supports data rates up to 230 kbps and features integrated charge-pump circuitry requiring four external 0.1 µF capacitors. It provides ±15 kV ESD protection on all I/O lines, complies with the EU EMC directive, and includes Schmitt-trigger inputs for noise immunity. The component is housed in a 16-lead SOIC package.

Feature Summary

• Integrated charge-pump voltage converter generates internal positive and negative supplies from a single 5 V source.
• Robust electromagnetic compatibility with compliance to EU EMC directives and low EMI emissions.
• High-level electrostatic discharge protection on all input and output pins.
• Schmitt-trigger receiver inputs provide hysteresis for reliable signal reception in noisy environments.

Applications

• General-purpose RS-232 data links
• Portable instruments
• Personal Digital Assistants (PDAs)

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature range. Ensure that the required external capacitors are included in the bill of materials, as they are not integrated within the IC. Confirm pinout compatibility if replacing legacy components in existing designs.

Selection Notes

Select this component for applications requiring high-speed RS-232 communication up to 230 kbps with robust environmental immunity. It serves as a direct upgrade for older MAX202E or ADM202 designs. Consider the TSSOP option if board space is limited, as it offers a smaller footprint compared to standard SOIC packages.

Part Context

The ADM202E series represents an evolution in RS-232 interface technology, offering enhanced ESD and EFT immunity compared to earlier generations. It is designed to operate reliably in electrically harsh environments where traditional transceivers might fail due to static discharge or fast transient bursts.

Replacement Considerations

The ADM202E is a pin-compatible upgrade for MAX202E, MAX232E, ADM202, and ADM232L devices. Verify that the replacement part number matches the original package style and operating temperature specifications before implementation.

FAQ

What is the function of the internal pull-down resistors?

Each RS-232 receiver input contains an internal 5 kΩ pull-down resistor to ground. This ensures that unconnected inputs default to a Logic 1 output level, preventing floating states.

How does the device handle ESD events?

The device utilizes protective clamping structures on all I/O lines to withstand up to ±15 kV air-gap discharge and ±8 kV contact discharge according to IEC1000-4-2 standards.

What external components are required for operation?

Four external 0.1 µF capacitors are required to support the internal charge-pump voltage doubler and inverter circuits. Larger capacitors up to 47 µF may be used if desired.