Using The Evo Dac 3 I S Input - M2TECH MANUNTA User Manual

MANUNTA
EVO DAC 3
BY M2Tech
DIGITAL-TO-ANALOG CONVERTER
www.manunta-audio.com
REVISION P – JUNE 2022
RB
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9. Using the Evo DAC 3 I S Input
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I S is a standard designed for inter-IC audio transfer. It communicates digital audio over 3
wires or signals: SDATA, LRCK and SCLK. A fourth wire carrying the master clock
(MCLK), is also usually necessary, unless the audio signal is sent to a sample rate
converter provided with its local master clock.
The Evo DAC 3 accepts I 2 S in differential LVDS physical format on an HDMI connector (PS
Audio standard). Both PCM and DSD can be transferred over this connection. Some
constraints apply to both SCLK and MCLK.
LRCK is the PCM sampling rate, it can be 44.1kHz to 768kHz.
SCLK must be 64 x LRCK and can be as high as 49.152MHz.
MCLK must always be present. It can be 22.5792MHz or 45.1584MHz for 44.1kHz-based
files (that is, files which sampling frequency is 44.1kHz or a multiple) or 24.576MHz or
49.152MHz for 48kHz-based files.
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When DSD is transferred over I S, SCLK becomes the DSDCLK and can be 2.8224MHz to
22.5792MHz. MCLK is mandatory with DSD, too.
As no constraints are indicated for MCLK in the PS Audio standard, it might happen that a
certain I 2 S source delivers higher master clocks than those accepted by the Evo DAC 3. In
this case, it is possible to halve the master clock frequency by enabling the related circuitry
by the free control app's settings section.
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