Specifications

Chapter 3: DM714 and MD704 Converters 17
Synchronization
DM714
The DM714 Sample Rate is set externally by one of two source
signals or internally by crystals and associated circuitry. The
Sample Rate Source is determined automatically by the pres-
ence of signals when the DM714 is powered on. The order in
which external signals are tested for presence is: AES, Word,
Internal.
The detected signal immediately becomes the source for the
DM714 sample rate clock. The auto-sensed Sample Rate
Source can be overridden using the button on the front panel
of the DM714, below the Sample Rate Source LEDs. If neither
AES nor Word Clock signals are present, the DM714 uses its
internal clock derived from on-board voltage-controlled crys-
tal.
The default internal Sample Rate of the DM714 is 48 kHz. This
default internal rate can be overridden with the Sample Rate
button on the front panel of the DM714 (directly below the
Sample Rate LEDs) to 44.1, 48 or 96 kHz.
MD704
The MD704 detects Sample Rate and Sample Rate Source like
the DM714 with the following two differences:
Since the MD704 is always a slave to an external Sample Rate
Source, there is no internal Sample Rate setting.
The MD704 can use MADI in addition to AES or Word Clock
as a Sample Rate Source, and detects the presence of these sig-
nals in the following order: AES, Word, MADI.
When a signal is detected, it immediately becomes the sample
rate clock of the MD704. The auto-sensed Sample Rate Source
can be overridden with the Sample Rate Source button on the
front panel of the MD704, below the Sample Rate Source
LEDs.
The converters occasionally do not lock to a 96 kHz AES Sync
signal. This condition can normally be remedied by cycling
the converter’s power, disconnecting and reconnecting the
AES Sync signal, or using Word Clock.