MAX9724A
60mW, DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown
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Overview
Features and Benefits
- 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)
Product Details
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
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX9724AETC+ | Material Declaration | Reliability Data | 12-LFCSP-3X3X0.75 | |
| MAX9724AETC+T | Material Declaration | Reliability Data | 12-LFCSP-3X3X0.75 | |
| Wafer Fabrication Data |
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.