3、 AUDIO IC MAX9820
The MAX9820 Windows Vista®-compliant stereo headphone amplifier is
designed for portable
Equipment where board space is at a premium. It features Maxim’s
DirectDrive® architecture to produce a ground-referenced output from a single
supply, eliminating the large output-coupling capacitors required by
conventional single-supply headphone amplifiers.
The MAX9820 features an undervoltage lockout that prevents over
discharging of the battery
During brownout conditions, click-and-pop suppression that eliminates audible
transients on startup, a low-power shutdown mode, and thermal-overload and
short-circuit protection. Additionally, the MAX9820 suppresses RF radiation
received by input and supply traces acting as
antennas and prevents the amplifier from demodulating the coupled noise.
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