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Quick measurements of Camelot Technologies Uther 2.0 DAC

pkane

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This is an old DAC utilizing dual-differential Burr-Brown PCM-63 chips with digital volume control. Released in the late 90's, Uther supports HDCD format, has balanced audio output, selectable dither and a large number and type of digital inputs, from I2S to Toslink to AES/EBU and coax SPDIF and AT&T glass. Powered by an external proprietary power supply, some versions of the DAC also came with a rechargeable battery. This one did not, and was tested from its personal power supply, which appears to perform extremely well with no leaking frequencies.

A quick set of measurements to gauge how well Uther2 performs. Fed by a 20/44.1kHz dithered signal, measured alternatively at 24/192k or 24/44.1k by Apogee Element24. Toslink SPDIF input was used for all tests.

1kHz measurement shows THD of -91dB and THD+N of -88dB. Third harmonic is just below -100dB level, although 7th and 9th are almost at that same level:
1khz.png


Multitone test:
multitone.png



CCIF IMD test:
CCIF.png

DIN IMD test:
DIN.png



Frequency and phase response:
freq+phase.png


White noise response showing the reconstruction filter:

white.png


Jitter at 12kHz is fairly low:
jitter.png


Distortion vs Frequency shows a rising 3rd and 2nd harmonics, while noise floor remains pretty much flat:
distortion-vs-frequency.png


And an extended bandwidth measurement of a 10-22k sine sweep playing:
16mhz.PNG


Simulated silence (-120dB sine wave) looks like this:
silence-16mhz.PNG
 

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