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7.3 Digital Inputs
The ADI-2 has a coaxial and an optical digital input.
The key INPUT sets the desired input active.
The digital input format is detected automatically. Be it AES, SPDIF or ADAT, further settings
at the ADI-2 are not necessary. In case of ADAT optical only channels 1 and 2 are converted to
analog, channels 3 to 8 are ignored.
To receive signals in AES/EBU format,
an adapter cable is required. Pins 2 and
3 of a female XLR plug are connected
individually to the two pins of a phono
plug. The cable shielding is only con-
nected to pin 1 of the XLR - not to the
phono plug.
The ground-free design, with transformers for digital inputs and outputs, offers a trouble-free
connection of all devices along with perfect hum rejection.
The ADAT optical inputs of the ADI-2 are fully compatible with all ADAT optical outputs. RME's
unsurpassed Bitclock PLL prevents clicks and drop outs even in extreme varipitch operation,
and guarantees a fast and low jitter lock to the digital input signal. A usual TOSLINK cable is
sufficient for connection.
SPDIF Double/Quad Speed
Both the coaxial and optical input support all sample rates between 32 and 192 kHz directly.
They operate in the so called Single Wire mode.
ADAT Double Speed
At sample rates above 48 kHz (Double Speed) ADAT uses the Sample Split method (also
known as S/MUX) to be able to operate at up to 96 kHz. The data of the channels 1 and 2 will
be transmitted using channels 1/2 and 3/4. The ADI-2 can receive and recombine data into 2
channels 96 kHz from all Sample Split compatible devices, like the Hammerfall, Hammerfall
DSP and ADI-8 series from RME.
Emphasis
The ADI-2's DA-converter supports Emphasis. This control information, only found in
SPDIF/AES signals, causes the converter to reduce treble. (Note: this technology was used in
the early days of digital audio, and is no longer used since years).
User's Guide ADI-2 © RME
9
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