User manual

8X96 ADC and DAC User Manual Page 36 of 54
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Hi-Speed AES/EBU interface (Standard)
Hi-speed AES/EBU interface is standard for both ADC and DAC converters. The
interface is capable of transferring of signals up to 24 bit and sampling rates of 25-
100kHz. It is also possible to select either AES/EBU or optional MDM DIO as inputs.
The digital signal is looped through to the AES outputs as well as the outputs of the
optional interface. Any interface specific flags except emphasis are dropped. In ADC
output sampling rate flags are set according to that of the sampling rate selector switch.
There are only flags for 44.1 and 48k: 88.2 and 96k are not flagged as there is currently
no AES/EBU standard for flagging high sample rates. The signal clock is regenerated
and the internal clock PLL removes incoming clock jitter, in other words jitter is
attenuated.
The AES/EBU interface will pass through (from its inputs to outputs) even 4
asynchronous signals. The format conversion, however, requires pairs to be synchronous
as only the clock of pair #1/2 is used for format conversion. If less than 4 pairs are used,
at least one pair should be feeding channels #1/2.
When digital input is selected, stripped wordclock is present at the wordclock output.
This signal is stripped off the clock of incoming signal. If AES/EBU input is selected, the
wordclock is stripped from the pair #1/2 only.
No sample rate conversion or noiseshaping is or can be performed during D-D transfers.
An upgraded version of AES/EBU interface is planned. It will feature following
additional functions which are not available now:
- “dual wire” , 4 channel interface option for 96kHz operation
- automatic sample rate flag detection
- ability to use internal clock generator in DAC (now available in MDM interfaces
only)
Inquire with Mytek about schedule and upgrades.