MAX9724DETC+

Audio Amplifiers Overview

The MAX9724DETC+ is a stereo headphone amplifier utilizing DirectDrive architecture for single-supply operation. It features an internally fixed gain of -1.5V/V and operates from a 2.5V to 5.5V supply. The device delivers up to 60mW per channel into a 32Ω load with 0.02% THD+N. Key specifications include an 80dB PSRR at 1kHz, 3.5mA quiescent current, and <0.1µA shutdown current. It incorporates integrated click-and-pop suppression and RF noise rejection. The component is housed in a 12-pin thin QFN package (3mm x 3mm x 0.8mm) and is specified over the -40°C to +85°C temperature range.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates bulky DC-blocking capacitors by generating an internal negative rail via a charge pump.
• Integrated low-power shutdown mode reduces current consumption to less than 0.1µA.
• Comprehensive click-and-pop suppression circuitry prevents audible transients during power-up and power-down.
• High power-supply rejection ratio allows operation from noisy digital supplies without additional linear regulators.

Audio Amplifiers Applications

• Cellular Phones
• MP3 Players
• Notebook PCs
• Handheld Gaming Consoles
• DVD Players

Audio Amplifiers Procurement Notes

Verify that the ordering suffix ET indicates the 12-pin thin QFN package configuration. Confirm the DE suffix corresponds to the internally preset -1.5V/V gain variant. Ensure compliance with the specified -40°C to +85°C operating temperature range for your application environment. Cross-reference the datasheet revision to confirm pinout consistency.

Audio Amplifiers Selection Notes

Select this part when board space is limited and external coupling capacitors are undesirable. The fixed -1.5V/V gain suits applications requiring specific input-to-output voltage ratios without external resistor networks. Consider the UCSP package if even smaller footprints are required, though it offers lower thermal dissipation capabilities compared to the TQFN option.

Audio Amplifiers Part Context

This component belongs to the MAX9724C/MAX9724D family of low RF susceptibility DirectDrive stereo headphone amplifiers. The MAX9724DETC+ specifically denotes the version with fixed gain and the thin QFN package. It shares architectural similarities with other Maxim Integrated audio solutions designed for portable electronics where efficiency and size are critical constraints.

Audio Amplifiers Replacement Considerations

MAX9724CEBC+T

Audio Amplifiers FAQ

How does the DirectDrive architecture affect output biasing?

The internal charge pump creates a negative supply rail, allowing the outputs to be biased about ground. This eliminates the DC offset typically found in conventional single-supply amplifiers, removing the need for large output-coupling capacitors.

What is the function of the SHDN pin?

The SHDN pin controls the low-power shutdown mode. Driving it low disables the amplifiers and charge pump, reducing quiescent current to less than 0.1µA. Driving it high enables full operation.