MAX9724A

PRODUCTION

60mW, DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown

Data Sheet (Rev. 6) Product Selection Table

Part Models: 2
1ku List Price: Starting From $0.62

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Overview

Improved RF Noise Rejection (Up to 67dB Over Typical Amplifiers)
No Bulky DC-Blocking Capacitors Required
Low-Power Shutdown Mode, < 0.1µA
Adjustable Gain (MAX9724A) or Fixed -1.5V/V Gain (MAX9724B)
Low 0.02% THD+N
High PSRR (80dB at 1kHz) Eliminates LDO
Integrated Click-and-Pop Suppression
2.7V to 5.5V Single-Supply Operation
Low Quiescent Current (3.5mA)
Available in Space-Saving Packages
- 12-Bump UCSP (1.5mm x 2mm)
- 12-Pin Thin QFN (3mm x 3mm x 0.8mm)

The MAX9724A/MAX9724B stereo headphone amplifiers are designed for portable equipment where board space is at a premium. These devices use a unique DirectDrive® architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. The MAX9724 suppresses RF radiation received by input and supply traces acting as antennas and prevents the amplifier from demodulating the coupled noise. The MAX9724A offers an externally adjustable gain while the MAX9724B has an internally preset gain of -1.5V/V. The MAX9724A/MAX9724B deliver up to 60mW per channel into a 32Ω load and have low 0.02% THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. Comprehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown.

The MAX9724A/MAX9724B operate from a single 2.7V to 5.5V supply, consume only 3.5mA of supply current, feature short-circuit and thermal-overload protection, and are specified over the extended -40°C to +85°C temperature range. The devices are available in tiny 12-bump UCSP™ (1.5mm x 2mm) and 12-pin thin QFN (3mm x 3mm x 0.8mm) packages.

Applications

Cellular Phones
DVD Players
Handheld Gaming Consoles
MP3 Players
Notebook PCs
PDAs
Smartphones

Part Models: 2
1ku List Price: Starting From $0.62

Documentation

Data Sheet 1

MAX9724-MAX9724B: 60mW, DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown Data Sheet (Rev.6) 09/01/2009

Technical Articles 1

Introduction to Digital Stethoscopes and Electrical Component Selection Criteria 05/10/2010

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX9724AETC+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX9724AETC+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 2, 2025 - 2505 PIN/ERRATA
		pcn_2505
MAX9724AETC+		pcn_2505

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX9724A and MAX9724B

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Features and Benefits

No DC-Blocking Output Capacitors Required
2.7V to 5.5V Operation
Adjustable -1.5V/V Gain
60mW per Channel into a 32Ω Load
0.02% THD+N
Fully Assembled and Tested

Product Details

The MAX9724A evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that uses the MAX9724A IC to drive a stereo headphone in portable applications. The MAX9724A is a 60mW stereo headphone amplifier with adjustable gain and DirectDrive® outputs. Maxim's DirectDrive technology eliminates the need for bulky DC-blocking capacitors at the output of the amplifier.

The EV kit is configured for a -1.5V/V gain and is designed to operate from a 2.7V to 5.5V DC power supply. The EV kit is capable of delivering up to 60mW per channel into a 32Ω load and achieving 0.02% THD+N.

The MAX9724A EV kit can also be used to evaluate the MAX9724B fixed-gain amplifier. Contact Maxim for a free sample of the MAX9724B IC.