Technical data

OWNERS MANUAL FOR WEISS DAC202 D/A CONVERTER
Page 17 Date: 03/10
The signal routing in various DAC202
operation modes, i.e. the insert mode
and dual wire mode as well as
synchronization options
This paragraph describes some advanced features of the
DAC202: The Insert mode, the Dual Wire mode and external
synchronization via Wordclock on the BNC connector or via the
other digital audio inputs.
There are four basic modes, which specify the input source for
the DAC:
1. FireWire
2. AES (XLR)
3. SPDIF (RCA)
4. SPDIF (TOSLINK) – note: up to 48kHz sampling rate only!
The respective input source is routed to all possible output
destinations (FireWire, XLR, RCA, DAC chip) as well as to the
APB (ARM processing buffer) for the bit transparency check.
When the Insert mode is engaged, the input source is not
routed to the DAC chip; the DAC chip receives its signal from a
secondary input instead. See Insert routing below. This allows
the user to insert an external processing stage into the audio
stream, e.g. a digital equalizer. The secondary input (so called
insert return) is selected within the config menu.
Each basic mode can be operated in either:
- Single Wire: L & R channels on a single AES/EBU or S/PDIF
cable (the normal mode).
or
- Dual Wire: L & R channels on two separate AES/EBU or
S/PDIF cables. If the Dual Wire mode is activated it is active
only with sampling rates of 176.4 or 192 kHz. With all other
sampling rates the DAC202 automatically switches to Single
Wire mode. Dual wire mode is useful for digital audio equipment
connection to the DAC202 where the units only support the high
sampling rates (176.4 / 192 kHz) in dual wire mode.
Besides the inputs as sync sources, Wordclock (“sync”)
input/output on BNC connectors are available. The applicable
Wordclock rate for Dual Wire mode is configurable to be:
halfrate (88.2/96 kHz) or
audiorate (174.6/192 kHz)
Mode: Firewire input / single wire / no insert
- The Firewire input is routed to: DAC chip, XLR out, RCA out,
APB.
- The Firewire output (going to the computer for recording) is
fed from the source specified as the sync source:
XLR selected as sync source: XLR signal goes to Firewire.
RCA selected as sync source: RCA signal goes to Firewire.
Toslink selected as sync source: Toslink signal goes to Firewire.
Internal or WC BNC or 1394 bus selected as sync source: The
Firewire output is muted.
Mode: Firewire input / single wire / insert active