MAX3120ESA

Overview

The MAX3120ESA is an IrDA 1.2-compatible infrared transceiver designed for battery-powered, space-constrained applications. It operates on a single +3V to +5.5V supply and consumes only 120µA during active operation, with a shutdown mode reducing current to 10nA. The device supports data rates from 2.4kbps to 115.2kbps and features a high-current LED driver capable of sinking 200mA. Packaged in an 8-pin SO (SOIC) format, it covers an operating temperature range of -40°C to +85°C.

Feature Summary

• IrDA 1.2 compatible with support for data rates up to 115.2kbps
• Low-power design with 120µA supply current and 10nA shutdown mode
• High-current infrared LED drive capability of 200mA
• Requires minimal external components: photodiode, IR LED, and resistor

Applications

• Personal Digital Assistants (PDAs)
• Palmtop Computers
• Cell Phones
• Hand-Held Equipment
• Peripherals

Procurement Notes

Verify the component against official Maxim Integrated datasheets to confirm authenticity. Ensure the package matches the specified 8-pin SO form factor. Check that the temperature grade corresponds to the industrial range (-40°C to +85°C). Confirm RoHS compliance status if required by specific manufacturing standards.

Selection Notes

Select this component for applications requiring compact IrDA communication links. It is suitable for designs where low power consumption is critical. Ensure the external optical components meet the specified wavelength and intensity requirements. Verify that the PCB layout allows for short connections between the photodiode and the PINC pin to minimize noise.

Part Context

The MAX3120ESA belongs to the MAX3120 family of infrared transceivers. This series includes variants such as the MAX3120CUA and MAX3120EUA, which differ primarily in packaging and temperature ratings. The ESA suffix specifically denotes the industrial temperature range and the standard SO package type within the product line.

Replacement Considerations

Direct replacements include other members of the MAX3120 family, such as the MAX3120EUA, provided the package difference is acceptable. Verify compatibility with existing board layouts when substituting between SO and µMAX packages.

FAQ

What is the maximum data rate supported by the MAX3120?

The MAX3120 supports data rates ranging from 2.4kbps to 115.2kbps.

How does the MAX3120 handle ambient light interference?

The device includes on-chip filtering that rejects out-of-band ambient light signals to prevent interference with IR communication.

What is the function of the SHDN pin?

The SHDN pin is a shutdown input that is active low. When asserted, it reduces the supply current to 10nA to extend battery life.