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Getting
the best audio performance from the CD-Pro2LF
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The usual audio
software on CD-DA discs has a SNR of 98 dB
max. The audio output
of the
CD10
decoder (SAA7324
M2 for CD-Pro2LF) is already de-emphasized,
and then quantized to 16 bits again. This
means at this stage, the theoretical max.
attainable SNR which the
CD-Pro2LF's
D/A Converter (AK4384)
can provide will be 98dB. Measured operational
values are about 97dB. THD at 0dB input signal
will be -85dB; at -60dB input signal will be
-35dB.
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For
the best audio performance, the power supplies
wires should be of AWG24 wire type. The PCB
should be connected to 2 independent
power
supplies. One for the +5V, the other for the
+9V. The ground terminals of the two power
supplies must be connected at the supply side
to reduce voltage drop or ripple over the
power wiring. the ground terminals of the
supply connector are not connected on the PCB
!!
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One
of the properties of the
CD-Pro2LF
D/A Converter (AK4384)
is that the
phase of the audio output has turned 180 degree.
For those customers who want to feature absolute
phase in their design, an inverting amplifier
should be used between CD-Pro2LF module
and speaker/headphone output.
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The AK4384 offers
excellent performance for audio systems. Using
AKM's multi bit architecture for its modulator,
the AK4384 delivers a wide dynamic range while
preserving linearity for improved THD+N
performance. The AK4384 integrates a combination
of SCF and CTF filters which will correct any
clock jitter and consequently increase the audio
performance of the application.
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The 24 Bit word
length and 192 kHz sampling rate make this part
ideal for high-end audio applications.
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You
can also download the complete datasheet of the
AK4384
(242k).
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