2.2 SYSTEM BLOCK DIAGRAM
A sample system block diagram for the ES66x8 Vibratto II DVD player board design is shown in the
following figure:
3. AUDIO OUTPUT
The ES66x8 supports two -channel analog audio output while ES66x8 supports six -channel analog audio
output. In a system configuration with six analog outputs, the front left and right channels can be configured to
provide the stereo (2 channel) outputs and Dolby Surround, or the left and right front channels for a 5.1 channel
surround system.
The ES66x8 also provides digital output in S/PDIF format. The board supports both optical and coaxial S/PDIF
outputs.
4.AUDIO DACS
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The ES66x8 supports several variations of an IS type bus, varying the order of the data bits (leading or
no leading zero bit, left or right alignment within frame, and MSB or LSB first) is possible using the ES66x8
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internal configuration registers. Th e IS format uses four stereo data lines and three clock lines. The IS data and
clock lines can be connected directly to one or more audio DAC to generate analog audio output.
The two-channel DAC is an CS4392. The DACs support up to 192kHz sampling rate.
The outputs of the DACs are differential, not single ended so a buffering circuit is required. The buffer circuits
use National LM833 op -amps to perform the low -pass filtering and the buffering.
10 |
ACEC
SHARP
