Θεόδουλος Λιοντάκης

Δάσκαλος Πληροφορικής ΠΕ86

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Now this is the final version of my PCM1794 DAC.

 I used AD797 opamps in the I-V stage because of the low noise requirement and excellent overall performance.

I put OPA627 in the filter section because people say it sounds good there.

I used OSCON and FC caps in the digital section, Sillmic II in the analog.

In the cs8416 PLL section I used NPO for 1nf and X7R for 22nf SMD capacitors as datasheet suggests.

Regulation is done by 1x REG104FA-5 and 3x LM1117 for the digital section and LM317,LM337 for the filter.

 

The I/V and filter I used is the one that in the datasheet gives 2V RMS output and 127db Dynamic Range (with a small modification to work better with the AD797):

 

Why I choose 127db/2V RMS stereo and not tried the dual mono 132db/9V?

 Because 127db is more than what even the highest end systems can make use of.

 The only case in which more db could make sense is maybe if the power amplifier was specially designed with low voltage amplification in order not to have to lower the 9V signal in the preamplifier, because when you do that the extra db you gained vanish in the noise.