AD82550A-Stereo Digital Audio Amplifier with Headphone Driver  DataSheet
Features
16/18/20/24-bit input with I2S data format
PSNR & DR (A-weighting)
Loudspeaker: 98dB (PSNR), 106dB (DR)
Headphone: 87dB (PSNR), 96dB (DR)
Multiple sampling frequencies (Fs)
8kHz, 12kHz, 16kHz, 22.05kHz, 24kHz
32kHz, 44.1kHz, 48kHz,
64kHz, 88.2kHz and 96kHz
System clock = 256Fs
8Fs switching for loudspeakers and headphones
Single or dual supply
Single supply: 3.0~3.3V for the whole chip
Dual supply: 3.0~5V for loudspeaker drivers
3.0~3.3V for others
Loudspeaker power
3.5W into 4Ω load @ 0dB 1kHz sinewave input
2.0W into 8Ω load @ 0dB 1kHz sinewave input
Loudspeaker power efficiency (η)
86% for 4Ω @ 0dB 1kHz sinewave input
91% for 8Ω @ 0dB 1kHz sinewave input
Headphone power
35mW into 32Ω @1kHz and 1% THD+N
65mW into 16Ω @1kHz and 1% THD+N
113mW into 8Ω @1kHz and 1% THD+N
Volume control for loudspeakers
53steps:+6~-34dB(1dB/step)-36~-58dB(2dB/step)
Mute function
Power down function
Anti-pop design
Over-temperature protection
Under-voltage shutdown
Short-circuit detection
Applications
CD and DVD
TV audio
Internet audio
USB speaker
MP3
Headphone Amplifier
PDA
Portable / Handheld
Mobile phone
Car audio
Description
This is a stereo digital audio amplifier with high power efficiency, which leads to longer battery life,less heat sink requirement, smaller board size and lower system cost. AD82550A can detect headphone connection and choose to drive either
stereo loudspeakers or stereo headphones.Operating with 3.0/3.3/5V loudspeaker driver supply,each loudspeaker channel can typically deliver 0.8/1.0/2.3W to a 4Ω loudspeaker, respectively, with less than 1% THD+N. Operating with 3.0/3.3V
headphone driver supply, each headphone channel can typically deliver 29/35mW to 32Ω, 54/65mW to 16Ω and 94/113mW to 8Ω, respectively, with less than 1% THD+N.
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