Apple MD772LL/A Personal Computer User Manual


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110 Chapter 5 What’s Under the Hood
Optical digital audio in
Basedonatypicalsituationwithplaybackofa1kHz,0dBFS24-bitsinewave,unless
otherwisespeciedbelow.
 Input sample rate: 44.1kHz,48kHz,or96kHz
 Signal-to-noise ratio: Greaterthan130dB
 Total harmonic distortion + noise: Lessthan-130dB(0.00003percent)
Analog Audio Specications
 Sample rate: 44.1kHz,48kHz,or96kHz
 Jack type: 1/8”mini
 Bits per sample: 16-bit,20-bit,or24-bit
 Frequency response: 20Hzto20kHz,+0.5dB/-3dB
Analog audio out using the headphone jack (typical values)
Basedonatypicalsituationwithplaybackofa1kHz,-3dBFS24-bitsinewave,44.1kHz
outputsamplerateinto150ohms,unlessotherwisespeciedbelow.
 Output voltage: 1.3volts(rootmeansquare)(V
rms
)(+4.5dBu)
 Output impedance: 55ohms
 Output power: 53milliwatts(mW)into32ohms
 Signal-to-noise ratio: Greaterthan90dB
 Total harmonic distortion + noise: Lessthan-70dB(.03percent)
 Channel separation: Greaterthan50dB
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