MAX9724BETC+

Audio Amplifiers Overview

The MAX9724BETC+ is a stereo headphone amplifier from Analog Devices/Maxim Integrated, utilizing DirectDrive architecture to eliminate bulky DC-blocking capacitors. It operates on a single 2.7V to 5.5V supply with a fixed internal gain of -1.5V/V. The device delivers up to 60mW per channel into a 32Ω load and features low 0.02% THD+N. Key electrical parameters include an 80dB PSRR at 1kHz, 3.5mA quiescent current, and less than 0.1μA shutdown current. It includes integrated click-and-pop suppression, thermal-overload protection, and short-circuit protection.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates the need for large output coupling capacitors by using a charge pump to create a negative rail, allowing ground-referenced outputs.
• Enhanced RF noise rejection prevents demodulation of coupled interference from input and supply traces acting as antennas.
• Integrated comprehensive click-and-pop suppression circuitry ensures silent startup and shutdown transitions.
• Low-power shutdown mode reduces quiescent current consumption to extend battery life in portable applications.

Audio Amplifiers Applications

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

Audio Amplifiers Procurement Notes

Verify package type and suffix against official documentation. Confirm RoHS compliance status. Check availability through authorized distributors. Ensure proper handling for ESD-sensitive components. Validate operating temperature range requirements.

Audio Amplifiers Selection Notes

Choose this component for space-constrained portable designs requiring high audio fidelity without external capacitors. The fixed gain simplifies design compared to adjustable variants. Consider thermal dissipation limits for continuous operation. Evaluate RF environment susceptibility if used near wireless transmitters.

Audio Amplifiers Part Context

Part of the MAX9724 family of DirectDrive stereo headphone amplifiers. Includes MAX9724A (adjustable gain) and MAX9724B (fixed gain). Available in 12-bump UCSP and 12-pin TQFN packages. Designed for low-voltage, low-power audio applications.

Audio Amplifiers Replacement Considerations

MAX9724AEBC+TG45: Adjustable gain variant in UCSP package. MAX9724AETC+: Adjustable gain variant in TQFN package. MAX9724BEBC+TG45: Fixed gain variant in UCSP package. Verify pinout compatibility and gain requirements before substitution.

Audio Amplifiers FAQ

How does the DirectDrive architecture benefit board space?

It eliminates the need for large DC-blocking output capacitors by using an internal charge pump to create a negative supply rail, allowing ground-referenced outputs.

What is the purpose of the SHDN pin?

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

Does the MAX9724B require external resistors for gain setting?

No, the MAX9724B has an internally preset gain of -1.5V/V, eliminating the need for external gain-setting resistors.