Crystal Vision
Introduction
System overview
The converter is configured as two independent converter channels each with their own
silence detection circuitry but sharing the same reference generation circuitry. Intelligent
audio routing provides for channel swapping, single channel mode and phase inversion.
A high stability ‘Xtal’ lock mode supports high quality crystal locked output sample rates
at 48kHz and a more flexible ‘Auto’ mode uses a phase locked loop for other output
sample rates. The ‘Auto’ mode phase lock loop range is useful when using an AES
reference outside 48kHz +/- 50ppm but within a wide range from below 30kHz to above
50kHz.
Two AES outputs are available for each channel from the 24 bit analogue to digital
converters. Headphone monitoring is provided for the analogue inputs.
Six different rear modules (RM) may be used with ADCA412, the RM03, RM11, RM13,
RM14, RM21 and RM35. Further details of the rear modules can be found in the
Installation chapter.
Control
Control of the card is on a first come first served basis from the card edge, Statesman, the
frame control panel (if fitted) or a remote control panel. For example, if a card edge lever
is moved the unit will switch to and remain in the ‘Local Control Mode’. If any control
panel menu is used, then the unit will switch to and remain in the ‘Remote Control
Mode’. The settings made will be remembered after a power down and the last control
mode used will be retained.
The auto-configuration process performed when an ADCA412 is first powered up, detects
the current configuration settings and restores the appropriate control.
Once this initialisation procedure is complete, the card can be controlled or configured
from Statesman, the card edge, the frame’s local control panel or from a remote control
panel.
ADCA412 User Manual R2.1
4
30 October 2018
