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发布者:微桥 发布时间:2011-12-1 阅读:4582次    关键字: 音频功放
AD82550A-Stereo Digital Audio Amplifier


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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