Crystal Vision
Introduction
Crystal Vision
Using card edge controls
4 Using card edge controls
The front edge of the card provides power rail monitoring, a configuration
dip-switch, analogue audio monitoring outputs, and a rotary control to set the
silence threshold delay.
LEDs monitor power rails, input presence, input sample rate and local/remote mode.
Selecting the sample rate mode
The DACA214 channel operates in two main modes. The primary mode is for
48 kHz sample rates using crystal oscillators to re-clock the digital audio input
to achieve optimum distortion figures. This is referred to as ‘Xtal Mode’ and
should be used at all times if possible.
The second mode uses built in phase locked loops and VCOs to accept any
sample rate from 30 kHz to 50 kHz. This is referred to as ‘Auto Mode’, and
should be used when the incoming sample rate is outside 48 kHz +/- 50 PPM.
The sample rate mode for each channel can be controlled from the card edge
using the first two levers of the DIL switch as explained in the following
table:
Lever Function
1
2
Down = Ch 1 in Auto (30-50kHz) mode, Up = Ch 1 in Xtal (48kHz) mode
Down = Ch 2 in Auto (30-50kHz) mode, Up = Ch 2 in Xtal (48kHz) mode
Note:
GPI connections to the ‘Auto’/ ‘Xtal’ mode change lines will override card
edge switches if asserted to a logic low or grounded.
DACA214 User Manual R1.9
17
04 February 2019