[Elite Semiconductor Memory Technology Inc.]

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.

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 3.0~3.3V for others
loudspeaker drivers
Loudspeaker power
  3.5W into 4Ωload @ 0dB 1kHz sinewave input
  2.0W into 8Ωload @ 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)