88 Series Outboard / 8801 Issue 7.3
4 - Optional Digital board
The 8801 has an expansion slot allowing access for digital connectivity.
The digital option available is an Analogue to Digital converter featuring AES/
EBU and DSD outputs
Analogue to Digital Converter - AES/EBU (AES 3) & DSD
The optional AES/EBU & DSD digital daughter board provides the following
connections:
• DSD Output
• Wordclock Input and Output
• SPDIF Output
• AES Output
• AES Sync Input
When the Analogue to Digital converter card is fitted the Digital O/P section
on the front panel is enabled.
Sampling Frequency Selection
Sample rate can be selected by pressing the Digital O/P button.
This will toggle through the sampling frequencies one at a time.
The current sampling frequency is indicated by the leds beneath the Digital
O/P button.
Digital Sync
The ADC option board has 2 sync inputs, AES 3 on a female XLR and Word
Clock on a BNC.
If neither sync input is present, the unit will synchronise to its internal clock.
If either of the sync inputs is present at the sampling frequency displayed on
the front panel, the LED (AES or WCLK respectively) will illuminate green
showing that the sync input is being used as a reference.
If the incoming sync sample rate differs from the sample rate displayed on
the front panel, the WCK or AES leds will flash.
If both sync inputs are present and correct the word clock input will be used
as the reference and the AES led will flash.
Double Rate AES Output
It is also possible to select 96kHz (or 88.1kHz) sampling rate with a 48kHz
(or 44.1kHz) sync input.
Similarly it is possible to select 192kHz (or 176.2 kHz) sampling rate with a
96kHz (or 88.1kHz) sync input.
This will cause the unit to output double rate AES on the AES Output
connector.
The sync led will illuminate green indicating the sync reference is still being
used for the digital output even though the ADC is sampling at twice the sync
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