Accuphase DC-101 Brochure
Precision Digital Processor
Standard
equipment
Standard
equipment
The DC-101 is a digital processor incorporating latest digital technology to handle new generation formats such as SACD (2.8224 MHz/1
bit) or DVD-Audio (192 kHz/24 bit). From the
data supplied by these high-quality sources, the
DC-101 extracts a music signal of the utmost
purity.
The crucial step of turning the digital information
into analog form is handled by an MDS (Multiple
Delta Sigma) converter. This principle was first
developed for the DC-330 and aff ords absolutely
outstanding conversion precision. To assure
flexibility and allow future expansion, all inputs
to the DC-101 are handled by option boards.
An HS-Link input board and a regular digital
input/output board are provided as standard
equipment.
n Two sets each of balanced and unbal-
anced analog outputs, low dielectric
constant and low loss Teflon boards,
MDS D/A converter board (left &
right), DAI board assembly .
n Assembly with DAI encoder/decoder,
Ultra Jitter-Free PLL Circuit, and other
circuits
Versatile processor features HS-Link input as standard equipment, for
SACD reproduction without compromise. Compatible with latest
generation of super high quality sources such as SACD and DVD-Audio.
Revolutionary MDS (Multiple Delta Sigma) converter with 24-bit
resolution assures superior precision. Ultra jitter -free PLL circuit topology .
MDS (Multiple Delta Sigma) converter reduces distortion to theoretical limits and
assures outstanding S/N ratio
MDS (Multiple Delta Sigma) is a revolutionary
design which employs sever al delta sigma type
converters in a parallel configuration, resulting
in drastically improved accuracy. The
delta sigma principle
combines
oversampling with
noise-shaping (a kind
of digital feedback)
which projects the
amplitude information of the digital signal onto
a time axis for precise conversion.
Figure 1 shows several delta
sigma converters which are
fed with the same signal
and whose outputs are
combined to arrive at
the overall wave-
Digital
input
Fig. 1 Principle of MDS type D/A converter
form. In the DC-101, six delta sigma convert-
ers are operated in parallel, resulting in
Signal
Conversion error
MDS
output
Note the ratio between signal and conversion
error. In the MDS output, the error is very
small in relation to the signal.
a performance improvement by a
factor of 2.45 (=√6 ).
Ultra Jitter-Free PLL Circuit
For the purpose of synchronizing operation of
the D/A converter with the digital audio interface
(DAI), a phase-locked loop (PLL) circuit is used
which generates a master clock to be used as
system reference.
DAI input signal
Fig. 2 Ultra jitter-free PLL circuit
Preamble
Frequency
detector
(pulse distortion removed)
Phase
compa-
rator
divider
Preamble signal
Loop
filter
Master clock output
As shown in the diagram, the Ultra Jitter-Free
PLL Circuit of the DC-101 consists of a
preamble detector
and a voltage-controlled oscillator (VCO)
using a quartz crystal
element. The master
clock produced by
this PLL circuit is totally free from the effects of pulse distortion and
jitter.
D/A converter with printed circuit boards
made from T eflon (glass fluor ocarbon resin)
with low dielectric constant and low loss
The D/A converter boards use a substrate of
glass fluorocarbon resin which has a stable, low
dielectric constant as well as superior heat resistance and high-frequency characteristics.
Using this material for the audio circuitry assures signal transmission with utmost purity,
resulting in a clear improvement in perceived
signal-to-noise ratio. In the DC-101, gold-plated
copper traces further contribute to sonic purity.
* Teflon is a registered trademark of DuPont USA.
n Ultra high performance optoisolators
(transmission rate 80
MBit/second) ensure
total electrical isolation of the digital and
analog sections, to
prevent unwanted
n Digital level control with wide adjustment
range (-
, -84 to 0 dB)
n T wo sets of balanced and unbalanced ana-
log outputs
n User-editable al-
phanumeric input
position indication
mutual interaction
and to shut out noise interference.
Option Boards
Accuphase offers a wide range of digital and analog input and output boards. Up to five such
boards can be installed in the option board slots of the unit in addition to the boards provided as
standard equipment. This allows the user to configure the system to fit any need.
n HS-Link Input Board DI2-HS1 for connection to DP-100 provided as standard equipment
Allows connecting the DP-100 to the DC-101 with an
HS-Link cable. The cable carries both the SACD and
CD signal for reproduction with optimal sound quality.
For copyright reasons, the SACD/CD signal supplied via
*
the HS-Link input board does not appear at the output
connectors of other digital input/output boards (except
HS-Link), and cannot be recorded.
T o record the digital CD signal from the DP-100, use the
*
coaxial connection.
DI2-HS1
n Digital Input/Output Board DIO-OC1 with optical and coaxial connectors provided as standard
equipment
This board allows connection of equipment such as a CD transport, MD recorder, etc. for high-quality
reproduction.
The digital outputs carry the input source signal and allow digital recording (except for the HS-Link signal).
*
n EXT DSP option board slot allows connection of DG-28
By installing a digital input/output board in this slot, sound field compensation entirely in the digital
domain becomes possible.
The DG-28 supports signals with a sampling frequency of up to 48 kHz. For sources with higher sampling
*
frequencies such as SACD, the Wide Range Digital Input/Output Board for DG-28 Connection DIO2-DG1
(see separate page) is required.
m Any option board can be used in any slot.
m All option boards designed for the DC-300,
DC-330, DP-75V, DG-28, DF-35, etc. can be
used.
Optional boards
HPC Coaxial (BNC) Input Board DI-BNC1
Digital Input/Output Board DIO-OC1
HPC Optical (ST) Input/Output Board DIO-ST1
AES/EBU Input/Output Board DIO-PRO1
n The photograph shows the DC-101 with
separately available option boards
installed and with the shielding cover
removed.
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