Hitachi HTDK170EUK, Service Manual

Page: 10 / 54

10
2.1 SYSTEM BLOCK DIAGRAM
System block diagram is shown in the following figure:
3. A
UDIO
O
UTPUT
The ES6008 supports two-channel analog audio output while ES6018 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 ES6008 also provides digital output in S/PDIF format. The board supports both optical and
coaxial S/PDIF outputs.
AV1000 Has also 5.1 channel Class-D amplifier outputs to 8 ohms satelites and 4 ohms
subwoofer.
4 A
UDIO
DAC
S
The ES6008/18 supports several variations of an I
2
S 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 ES6008/18 internal configuration registers. The I
2
S format uses four stereo
data lines and three clock lines. The I
2
S 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 AKM AK4382A. 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.