ATI Audio DXA112-BNC User Manual
Page 3
ATI Audio Inc.
Tel: 856-719-9900
www.
audio.com
RECEIVERS
The equalized AES/EBU data stream is applied to the receiver circuit U8 (U17), a
Crystal Semiconductor CS8414 96kHz Digital Audio Receiver IC. The CS8414
receives the data, recovers the clock and synchronization signals and separates
the audio and digital data. The audio data may be 16 to 24 bits at sample rates
from 27 to 96 kHz.
OUTPUT DRIVERS
DXAxxx-XLR use balanced, 110-ohm, transformer-coupled outputs and XLR type
connectors. DXAxxx-BNC units use the alternative 75-ohm unbalanced outputs
to BNC coax connectors. The XLR outputs are in full compliance with
specification AES3-1992 and the BNC outputs are in accordance with the
recommendations of AES-3id-1995. RS-422 differential line drivers U1 and U2
(U5 and U6) provide a balanced drive for XLR outputs of 8Vp-p, open circuit
through 110-ohm source resistance to yield 4Vp-p when loaded by a 110-ohm
load. XLR outputs are transformer-coupled for ground isolation. Each side of the
differential line driver output is used to separately drive a 75-ohm capacitor-
coupled BNC output. Each BNC output provides 4Vp-p open circuit thru 75 ohms
for a loaded output of 2Vp-p. Although the two sides of a differential line driver
are out of phase with each other there is no phase difference in the recovered
audio since the AES/EBU digital data is defined only by the presence or absence
of transitions. It makes no difference whether those transitions are hi-to-low or
low-to-hi.
REFERENCE OSCILLATORS AND POWER SUPPLIES
U7 and U13 provide regulated and quiet +/-5VDC for all circuits. Power
transformer primary windings are paralleled for 115VAC or wired in series for
230VAC. Jumper group E1 allows field modification if necessary.