Back Panel Descriptions - Benchmark ADC1 USB Instruction Manual

Back Panel Descriptions

All of the outputs are controlled by the front-
panel Mode Switch. The status of these
outputs is shown in the Mode Display
adjacent to the Mode Switch.
Three of the outputs are Main Outputs and
always operate at 24-bits. The Main Outputs
may be synchronized to an external clock
reference or may be controlled by the internal
clock. The Optical Output has two modes of
operation; AES/EBU and ADAT. The ADAT
mode supports ADAT (44.1 and 48 kHz),
2
ADAT S/MUX (88.2 and 96 kHz), and ADAT
4
S/MUX (176.4 and 192 kHz).
The Aux Output can operate asynchronously
at 44.1 or 48 kHz with a TPDF-dithered 16-bit
word length. The Aux Output is provided as a
convenience for making safety backups or
demo recordings to low-resolution 16-bit
recorders (i.e. CDR or DAT). If this low-
resolution function is not needed, the Aux
Output can be set to mirror the high-
resolution Main Outputs.
• XLR connector, balanced, AES/EBU
professional format, 24-bits
ADC1 USB Instruction Manual
• Aux BNC connector, un-balanced,
AES/EBU professional format, 24-bit or
16-bit compatible with most SPDIF
inputs
• Main BNC connector, un-balanced,
AES/EBU professional format, 24-bit
compatible with most SPDIF inputs
• Optical TOSLINK connector, multi-
format (AES professional, ADAT, ADAT
S/MUX II & IV), 24-bits
• USB Computer Interface
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 USB ships with BNC-to-
Page 10