Crystal Vision
Specification
7 Specification
ADCA412
Inputs
Audio
2 analogue stereo pairs or 4 mono channels, 20 bit quantising A to Ds,
Electronically balanced. High input impedance (20Kohm) balanced.
External reference
1 AES/EBU reference 110 Ohm, 75 Ohm or high impedance.
1 word clock reference 110 Ohm, 75 Ohm or high impedance
1 video syncs reference 110 Ohm, 75 Ohm or high impedance
Reference sources
The same reference is selected for both AES/EDU channels.
Video mixed syncs or Black and Burst, 525 or 625 standard, 48kHz.
AES/EBU input 48kHz, 44.1kHz or 32kHz.
Word clock input at 48kHz
(Note: video syncs and word clock share the same input)
Outputs
Audio
2 independent 20 bit AES/EBU stereo pairs. 110 Ohm with output sub-
module OPAES-110 or 75 Ohm (unbalanced) with output sub-module
OPAES-75. Each AES/EBU signal has 4 identical outputs.
(Note: either OPAES-110 or OPAES-75 must be fitted)
Monitoring
2 x miniature front mounted audio jacks to monitor stereo inputs. Also
available on rear connector
Output sampling
frequency
Crystal re-clocking for 48 kHz sample rate, for minimum THD and
maximum reference input signal noise and jitter rejection. From 30 kHz
to 50 kHz in ‘Auto’ Mode for AES reference only. The 2 AES channels
are interdependent and will be at the same frequency at all times.
Performance
Noise
< -95dB wrt full scale analogue input/ 0dBFS AES/EBU input.
THD
+N <0.005% at –0.5dB wrt full scale analogue input
Output
Range Potentiometer adjustment and links for 0dBFS AES level, from +12dBu
to +28dBu analogue input.
Default level: 0dBFS = +18dBu or +24dBu by on-board link.
Shuffle modes
Channels may be swapped so that Stereo Input 1 feeds AES 2 and Stereo
Input 2 feeds AES 1.
Both output stages may be assigned to either Stereo Output 1 or Stereo
Output 2 (DUAL mode).
ADCA412 User Manual R2.1
39
30 October 2018
