ADC1 Instruction Manual Page 9
ADAT Optical Output Mode
• Data Format = ADAT
• Word Length = 24 bits
• Sample Rate = 44.1 or 48 kHz
• Clock Source = Internal or external
• ADAT channel assignments: 1 = Left, 2 =
Right, 3-8 = muted
ADAT S/MUX2 Optical Output
Mode
• Data Format = ADAT
• Word Length = 24 bits
• Sample Rate = 88.2 or 96 kHz
• Clock Source = Internal or external
• ADAT channel assignments *: 1 = Left a,
2 = Left b, 3 = Right a, 4 = Right b, 5-8 =
muted
* a, and b are successive samples
ADAT S/MUX4 Optical Output
Mode:
• Data Format = ADAT
• Word Length = 24 bits
• Sample Rate = 176.4 or 192 kHz
• Clock Source = Internal or external
• ADAT channel assignments **: 1 = Left a,
2 = Left b, 3 = Left c, 4 = Left d, 5 =
Right a, 6 = Right b, 7 = Right c, 8 =
Right d
** a, b, c, and d are successive samples
SPDIF/AES BNC Main and Aux Outputs The two BNC coaxial digital outputs use
female BNC connectors. These connectors are
securely mounted directly to the rear panel.
These are 1 Vpp unbalanced outputs with 75-
Ω source impedances. Outputs are DC-
isolated, transformer-coupled, current-
limited, and diode-protected. Use 75 Ohm
coaxial cable when connecting these outputs
to other devices. The use of 50 Ω coax is not
recommended and may cause data
transmission errors.
Many customers are more familiar with
consumer-style RCA-equipped SPDIF digital
interfaces. The ADC1 ships with BNC-to-RCA
adapters. These adapters allow easy
interfacing with consumer-style digital
interfaces. BNC to RCA coaxial cords are also
available from Benchmark.
BNC connectors are specified by the AES3-id
and SMPTE 276M standards for 75-Ω 1 Vpp
digital audio signals and are commonly used
in video production facilities and other
professional audio applications. RCA
connectors are specified by IEC 609588-3 for
75-Ω 0.5 Vpp consumer-format digital audio
signals (commonly known as SPDIF). We
have chosen to comply with the professional
standards because the BNC connectors lock
and are generally more reliable than RCA
connectors. Compliance with the 1 Vpp digital
audio standards increases the reliability of
digital connections, and often allows
increased transmission distances.
Main BNC Output
This digital data at this output is identical to
that of the Main XLR Digital Output.
• Data Format = AES/EBU professional
format
• Word Length = 24 bits
• Sample Rate = 44.1, 48, 88.2, 96, 176.4,
or 192 kHz
• Clock Source = Internal or external
Aux Output
This BNC digital output has two signals
available to it. The first is a 16-bit TPDF
auxiliary output for use with low-resolution
devices. The second signal is the Main digital
output and is identical to the data available at
the other Main digital outputs.
• Data Format = AES/EBU professional
format
• Word Length = 16 bits TPDF dithered, or
24 bits
• Sample Rate = 44.1 or 48 at 16-bits,
44.1, 48, 88.2, 96, 176.4, or 192 kHz at
24-bits
• Clock Source = Internal at 16-bits,
internal or external at 24-bits