ADM231LJRZ-REEL

Overview

The ADM231LJRZ-REEL is a CMOS RS-232 driver and receiver manufactured by Analog Devices Inc. It operates from a single 5 V supply (VCC) and an external positive supply ranging from 7.5 V to 13.2 V (V+). The device integrates an internal charge pump that generates a negative supply voltage, eliminating the need for external dual supplies. It provides two drivers and two receivers, supporting data rates up to 120 kbps. The package is a 16-lead SOIC with a reel suffix indicating tape-and-reel packaging.

Feature Summary

• Integrates internal charge pump circuitry to generate required RS-232 voltage levels from a single digital power source.
• Features Schmitt trigger inputs on receivers to ensure noise immunity and error-free reception of slow transition signals.
• Includes internal pull-up resistors on transmitter inputs and pull-down resistors on receiver inputs to define logic states when unconnected.
• Complies with EIA-232-E and V.28 specifications while maintaining low power consumption through CMOS technology.

Applications

• Computers
• Peripherals
• Modems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and reel configuration. Ensure the component meets RoHS compliance requirements for your assembly process. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm availability and authenticity before procurement.

Selection Notes

Select this component when designing systems requiring RS-232 communication without access to a negative voltage rail. It is suitable for applications needing two drivers and two receivers. Verify that the external V+ supply voltage falls within the specified range of 7.5 V to 13.2 V. Consider alternative family members if shutdown control or additional channel counts are required.

Part Context

This component belongs to the ADM2xxL family of line drivers and receivers designed for EIA-232-E and V.28 interfaces. It serves as an enhanced upgrade to the AD2xx series, offering lower power consumption and faster slew rates. The family allows operation from a single 5 V supply, simplifying power design in systems where 12 V is unavailable.

Replacement Considerations

ADM231LJNZ

FAQ

Does the ADM231L include a low power shutdown mode?

No, the ADM231L does not feature a shutdown pin. Only specific members of the ADM2xxL family, such as the ADM236L and ADM241L, include this functionality.

What external components are required for operation?

The device requires two external capacitors connected to the C1+ and C1– pins to support the internal charge pump voltage converter.

How does the device handle unused transmitter inputs?

Unused transmitter inputs can be left unconnected because each input has an internal 400 kΩ pull-up resistor to VCC, which forces the outputs into a low state.