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In Reply to: RE: Discrete DAC's posted by knewton on November 12, 2016 at 07:20:29
...do these discrete/NOS DACs pass high resolution data untouched or do they down sample the incoming data/music to 16/44.1?
Edits: 11/12/16Follow Ups:
The old dac chips can handle quite high sample rates. For instance, the AD1865 and PCM63 can do 8 x 44.1kHz and the TDA1541a can do 4x or 8x depending on implementation. In their original cd players of the 80s, there were oversampling chips built in so that the 44.1kHz data was oversampled before it got to the dac chip.
If the dac is set up for NOS and the input/interface device allows, a dac with one of the old dac chips can handle high resolution, i.e. max. of 8x 44.1kHz = 352.8kHz or 8 x 48kHz = 384kHz.
The input/interface device (USB to I2S, USB to SPDIF, etc) is usually the limiting factor and that is usually governed by the conversion chip (i.e. XMOS, etc) and the speed of the clocks installed.
" ...do these discrete/NOS DACs pass high resolution data untouched or do they down sample the incoming data/music to 16/44.1?"
Non-oversampling (NOS) DACs transition the data off the media directly to analog, without any other digital conversion or processing taking place. All the filtering is analog, after the D/A transition takes place.
(Downsampling to 16/44 would degrade the signal, if the native rate off the media is of higher resolution.)
Most R2R dacs handle directly up to 24/192. They will not do DSD. My dac does not down or oversample. It also has no digital or analog filters
Alan
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