MAX9724B Datasheet | Maxim Integrated

.. 19-3597; Rev 3; 3/07 60m W, Direct Drive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown 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 † Direct Drive™ architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and ponent height. The MAX9724 suppresses RF radiation received by input and supply traces acting as antennas and prevents the amplifer 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 60m W per channel into a 32Ω load and have low 0.02% THD+N. An 80d B at 1k Hz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. prehensive 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 3.5m A 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 12bump UCSP™ (1.5mm x 2mm) and 12-pin thin QFN (3mm x 3mm x 0.8mm) packages. Features - Improved RF Noise Rejection (Up to 67d B 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 (80d B at 1k Hz) Eliminates LDO - Integrated Click-and-Pop Suppression - 2.7V to 5.5V Single-Supply Operation - Low Quiescent Current (3.5m A) - Available in Space-Saving Packages: 12-Bump UCSP (1.5mm x 2mm) 12-Pin Thin QFN (3mm x 3mm x 0.8mm) MAX9724A/MAX9724B Ordering Information PART MAX9724AEBC+T...