ADC1 Instruction Manual Page 4
Overview The ADC1 is a reference-quality, 2-channel
192-kHz 24-bit audio analog-to-digital
converter featuring Benchmark’s UltraLock™
technology. The ADC1 is designed for
maximum transparency. It is well suited for
the most demanding applications in studios
and mastering facilities. A rugged and
compact half-wide 1 RU enclosure also makes
the ADC1 an excellent choice for location
recording, broadcast facilities, and mobile
rigs. The internal power supply supports all
international voltages and has generous
margins for over and under voltage
conditions.
The ADC1 achieves outstanding performance
over a wide range of input levels. Each
channel has a 41-detent variable gain control,
a 10-turn calibration trimmer, and a 3-
position first-stage gain switch (0, 10, and 20
dB). Each channel has a two-position toggle
switch that selects either the 41-detent pot or
the 10-turn trimmer. Both the pot and the
trimmer have a 20 dB adjustment range. In
combination with the first-stage gain switch,
these controls provide exceptional SNR and
THD+N performance over a 40 dB adjustment
range. The 10-turn calibration trimmer may
be used to calibrate the ADC1 to precise
studio reference levels. It may also be used to
optimize the gain-staging between a
microphone preamplifier and the ADC1.
The ADC1 has four digital outputs (1 balanced
XLR, 2 coaxial, and 1 optical). The optical
output supports AES, ADAT, and ADAT
S/MUX. The two coaxial outputs (Main and
Aux) can operate simultaneously at different
word lengths and even at different sample
rates. The ADC1 has the flexibility to allow
simultaneous high-resolution and low-
resolution recordings. For example, the main
outputs of the ADC1 can be set to 192 kHz
24-bits while the auxiliary output is set to
44.1 kHz 16-bits for a safety backup or CDR
demo recording. Both the Main and Aux
Outputs originate from the same A/D
converter. All outputs are professional format.
The ADC1 has a Word Clock output that
follows the sample rate of the Main Outputs.
The Word Clock output is active in all modes
of operation.
A multi-format clock input automatically
recognizes AES/EBU, SPDIF, Word Clock, or
Super Clock signals. This clock input is used
to synchronize the Main Outputs. If desired,
the Main Outputs may be driven from internal
sources. The ADC1 will automatically revert to
an internal clock source when the external
clock is lost.
The ADC1 has two clock modes: Auto and
Internal. Both modes support 44.1, 48, 88.2,
96, 176.4 and 192 kHz.