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General Description

The MAX9724A/MAX9724B stereo headphone amplifiers are designed for portable equipment where board space is at a premium. These devices use a unique, patented? 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

Features

? 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)

Applications

??? Cellular Phones

??? MP3 Players

??? Notebook PCs

??? Handheld Gaming Consoles

??? DVD Players

??? Smart Phones

??? PDAs