|
Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
|
|
|
Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
|
In Reply to: RE: Yes, imagine the price if they had to design the DAC inside the fancy box posted by morricab on June 18, 2024 at 01:23:52:
Now you mention it there was a company called UltraAnalog that made DAC modules, which contained discrete components. Maybe Accuphase used those? I think you are right that discrete DACs were made out of necessity before good monolithic DACs then faded away during the PCM63/1702/1074 era and are now back with us.The claim that a laser-trimmed PCM1704 is MUCH higher precision should be tempered. Here is the linearity plot from Stereophile's measurement of a CH Precision C1.2 ($43k as reviewed in Jan 2023). This uses four DAC chips per channel (two paralleled for each phase).
We can see the linearity error starts to grow below -60dBFS (JA is more generous in saying -80dB). Compare that to the holo May DAC with a discrete R-2R DAC.
Here there is no linearity error until down to -120dBFS. This is up there with delta-sigma DACs and I don't know how Holo does it. You might find plots for PCM63/1702/1704 that are much better than CH Precision's implementation but even the best will not exceed the Holo May.footnote for anyone who doesn't read graphs:
The blue lines represent the 'gain' of the DAC from input digital value along the bottom to the measured analog output voltage on the left axis. Both are scaled in dB with the top-right corner representing the max analog output voltage for the maximum input digital value. Ideally the blue line should be straight as it slopes down to the minimum values in the bottom left corner. The red line shows the slope of the blue line - the blue line should have a slope of 1 (= 0dB). The red line should be completely flat across the plot with a value of 0dB, where it is not 0dB indicates a linearity error in the DAC.
Edits: 06/18/24
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Yes, imagine the price if they had to design the DAC inside the fancy box - 13th Duke of Wymbourne 12:12:20 06/18/24 (1)
- RE: Yes, imagine the price if they had to design the DAC inside the fancy box - morricab 01:37:14 06/19/24 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
