8
Synchronizer
Mode
(Jumper #2
Removed)
Synchronizer
mode is an alternative operating mode where no audio A/D or D/A conversion
takes place. Instead, it allows for an AES input to be sample rate converted and reclocked to
reveal an AES output that is low jitter, and—when a reference signal is applied—locked to
reference. In this mode the DIP switches are ignored and all configuration options are set
via a 3-position jumper located inside the ADA4 case. To access this jumper, remove the
four phillips screws securing back side of the ADA4 case (the side having the DIP switch
access hole in it). Once the case cover is removed, you can easily identify the jumper by its
appearance. Jumper positions 1 through 3 are clearly marked on the circuit board next to
the jumper. Refer to the following diagram for jumper settings and their meaning.
ADA4, Internal Jumper Settings
Jumper 3
Jumper#3 is currently unused.
Lock LED
An LED is located next to the BNC connectors which shows the type of signal locked (if
any). Here are the meanings of the LED colors:
•
Red = HD lock
•
Green = SD lock
•
Amber = AES-11 lock or Word Clock lock
Example:
Normal mode selected.
Meaning:
Jumper 2 installed—Normal Mode: S witches 1 and 2
independantly define A/D or D/A mode for their
respective pair of channels. Switches 3 and 4 are
used together to define the audio level.
Jumper 2 removed—Synchronizer Mode: Switches 1-4 have
no effect. The ADA4 is in D/D mode, with the output
re-timed to the reference signal, when applied.
Without a reference signal applied, the ADA4 re-
clocks the output based on its stable free-running
local oscillator.
Jumper 1:
1
2
3
Example:
96kHz output mode selected
(jumper effectively removed).
Jumper 2:
1
2
3
Meaning:
Jumper 1 installed—48kHz: Any AES outp uts and the AES-11
reference output are running in 48kHz mode.
Jumper 1 removed—96kHz: Any AES ou tputs and the AES-11
reference output are running in 96kHz mode.
Note:
Jumper 3 is not used, but is provided as
a spare.
Jumper 3:
1
2
3
Meaning:
n/a: Jumper 3 is not used.
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