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Input and Output
The CEDAR ADA has analogue inputs and outputs at both professional and
consumer signal levels. The professional level signals are electronically balanced
and use XLR connectors, while the consumer signals are unbalanced and carried
by RCA (phono) connectors. In each case, the input level is adjustable over a
range of 18dB, and the output level may be set to one of three levels, each
separated by 6dB.
There is a button to select professional or consumer input. Both outputs are
active at all times. There are also buttons to select the AES/EBU or SPDIF input or
output for the D/A and A/D sections.
You may define the channel status bits embedded within the digital audio. For
sample rates of 32kHz, 44.1kHz and 48kHz, the status bits can be set to
Professional or Consumer mode. For sample rates above 48kHz, the status bits
will be forced to Professional mode because these rates are not supported by
Consumer mode.
Front Panel LED
The LED on the front panel is normally red to indicate that power is present. It
has a secondary role to indicate the status of the digital inputs.
Note: Fast flashing between red and amber indicates either (i) a loss of digital
input or (ii) that the unit is being calibrated.
Block Diagram
INTRODUCTION
The CEDAR ADA A/D and D/A Converter is a 24-bit, 96kHz 1U rackmount unit
that produces an AES/EBU or SPDIF digital audio output from a balanced or
unbalanced analogue stereo audio input. It also produces a stereo balanced or
unbalanced output from an incoming AES/EBU or SPDIF digital input signal.
At any given time, the unit operates in one of four sync modes:
Master Mode
The clock signals are generated internally by an on-board master clock at a user-
selectable rate: 32kHz, 44.1kHz, 48kHz, 88.2kHz or 96kHz.
Slave Mode
If a digital signal is present at the selected digital input, the ADA synchronises to
it. If no such signal is present, no output is generated.
Auto Mode
If a digital signal is present at the selected digital input, the ADA synchronises to
it. If no such signal is present, the ADA uses its internal master clock at the user-
selected sample rate.
Auto Lock Mode
This operates in the same manner as Auto Mode except that, if no digital signal is
present, the ADA uses its internal master clock running at the most recently
synchronised sample rate.
Note: When operating in any other than Master Mode, the front panel power LED
will flash whenever the ADA is not synchronised to the incoming digital
signal.
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