Instruction Manual for DAC2 HGC and DAC2 L with
2.X Firmware
Page 22
Coaxial Digital Inputs - D3 and D4
The coaxial digital inputs (D3 and D4) use
female RCA connectors. The input impedance
is 75 Ohms. Maximum word length is 24-bits.
All sample rates between 28 and 195 kHz are
supported. The coaxial digital inputs will
accept professional AES/EBU data formats or
consumer S/PDIF data formats. The coaxial
inputs also accept DSD in DoP 1.1 format.
The coaxial digital inputs are DC isolated,
current limited, and diode protected. The RCA
body is bonded directly to the chassis to
prevent currents in the internal ground
system. This direct bonding also maximizes
RF shielding.
Caution:
Use 75-Ohm coaxial cables for
digital audio connections D3 and D4. Digital
interfaces require the use of matched
impedances. Do not use 50-Ohm coaxial
cables, twisted pair cables, or any non-coaxial
cables for digital audio. The digital inputs may
not function, or may be unreliable if the
incorrect cable is used.
Tip:
The RCA analog inputs and outputs have
no restrictions on cable type. To avoid
confusion, we recommend using 75-Ohm
coaxial cables for all RCA connections. 75-
Ohm coaxial cables are compatible with digital
audio, analog audio, and video.
Note:
The Coaxial inputs (D3 and D4) accept
professional or consumer digital audio
formats. The AES3-id and SMPTE 276M
standards specify a 75-Ohm, 1 Vpp,
professional format which is also known as
AES/EBU and is commonly used in video
production facilities. The IEC 609588-3
standard specifies a 75-Ohm, 0.5 Vpp,
consumer format which is also known as
S/PDIF, and is commonly used in hi-fi
equipment. The coaxial inputs are designed to
accept either type of signal.
12V TRIGGER I/O
The Benchmark bi-directional 12V TRIGGER
is compatible with virtually all trigger
systems. The 12V TRIGGER I/O connection
on the DAC2 can be used as an input, an
output, or both. It is compatible with most 12
volt trigger inputs and outputs. The 12V
TRIGGER can be used to turn other audio
components on when the DAC2 turns on.
The DAC2 can also turn on and off in
response to trigger signals sent from other
components.
The 12V TRIGGER I/O can be connected to
the trigger input or output ports on a
preamplifier, power amplifier, or both.
The DAC2 can send a 12 Volt trigger signal to
start other components in the system, or it
can wake up in response to an externally
generated trigger signal. The DAC2
automatically configures the 12V TRIGGER
I/O port as an input (slave) or output
(master). See the Bi-directional 12V
Trigger section for more information.
The Benchmark 12V TRIGGER I/O has a
wide operating range to allow interfacing with
most other DC trigger systems. It should only
be used with trigger inputs that are designed
to tolerate 12 VDC.
•
12 VDC 200 mA current-limited output
•
Input responds to 3.3 V logic and
higher
•
Maximum input voltage = 30 VDC
•
Maximum reverse input voltage = -0.3
VDC
•
Input Impedance = 20 k Ohms
•
1/8" (3.5 mm) TRS jack
•
Tip = 12 Volt Trigger I/O
•
Ring = no connection
•
Sleeve = chassis ground
Caution:
The 12V TRIGGER I/O is not an
audio connection! This is a 12V DC connection
for synchronizing the on and off sequencing of
an entire audio system.