ANK DAC5.1 Signature, Construction Manual

Page: 63 / 104

12 - Digital Board
Figure 39 - Digital Board
What is the Digital DAC Board?
This is a PCB board that basically takes the SPDIF signal from a device like a transport or CD
player or computer and converts it into an analog signal which represents the music and can be
amplified by the output stage in our DAC5.1. SPDIF is a standard for digital music: Sony Philips
Digital Interface Format .
THE SPDIF signal goes through a torrodial input transformer, this is done for protection and to
ensure a high quality SPDIF signal gets delivered to the Board. Out of the torrodial it enters the
CS8414 receiver chip, this chip will strip off the modulation and output a pure digital 1’s & 0’s
format. This enters the Analog Devices AD1865 Resistor Ladder Chip. This chip will output a
current source representing the analog waveform. A high quality AudioNote tantalum resistor
of 330 ohms is on the output board and this current combined with the resistor will create the
output Voltage audio signal that we will then pass on to the IV transformers in the next stage.
The DAC5.1 Digital Board has been preassembled and tested, and it is almost ready to be
installed in the chassis.
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