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 supports data rates from 2.4kbps to 115.2kbps. The device consumes only 120µA during operation and features a 10nA shutdown mode to extend battery life. It includes a high-current LED driver capable of sinking 200mA and requires minimal external components: a photodiode, an infrared LED, and a current-setting resistor. The component is housed in an 8-pin SO package.

Feature Summary

• IrDA 1.2 compatible with flexible optics selection
• Low-power design with 120µA active and 10nA shutdown currents
• High-current infrared LED drive capability up to 200mA
• Single-supply operation from +3V to +5.5V

Applications

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

Procurement Notes

Verify the specific suffix 'ES' indicates the extended temperature range (-40°C to +85°C) and the 'A+' denotes lead-free/rohs-compliant packaging. Confirm the manufacturer designation as Analog Devices Inc./Maxim Integrated. Ensure the package type matches the required 8-pin SO footprint for your PCB layout.

Selection Notes

Select this component when designing compact, battery-operated devices requiring IrDA 1.2 compliance. It is suitable for environments where board space is limited due to its low-profile package and minimal external component requirements. Consider the 200mA drive capability if driving standard IR LEDs at maximum distances.

Part Context

The MAX3120ESA+ belongs to the MAX3120 family of low-profile infrared transceivers. This series is optimized for portable electronics where power consumption and physical size are critical constraints. The ESA+ variant specifically provides the extended industrial temperature range and compliant packaging necessary for robust commercial deployments.

Replacement Considerations

MAX3120CUA+

FAQ

What is the minimum number of external components required for the MAX3120?

The MAX3120 requires a minimum of three external components: a PIN photodiode, an infrared LED, and a current-setting resistor.

How does the MAX3120 handle ambient light interference?

The device incorporates on-chip filtering that rejects out-of-band ambient light signals, preventing them from interfering with the infrared communication.

What is the function of the SHDN pin?

The SHDN pin is the Shutdown Input. When driven low, it activates the shutdown mode, reducing the supply current to 10nA to conserve battery power.