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Setup & Operation
For AD Operating Modes Multichannel "Slave":
1.
From the Operating Menu, select the desired Base Sample Rate (SETUP/MODE/44.1_X
or 48_X) and Preset Configuration (SETUP/PRESETS).
2.
From the Operating Menu, select (SETUP/INPUT/REFCLK/REFWCLK).
3.
From the Operating Menu, select (SETUP/INPUT/MON_REF/A/D_REF).
For DD Operating Modes Multichannel "Slave":
1.
From the Operating Menu, select the desired Base Sample Rate (SETUP/MODE/44.1_X
or 48_X) and Preset Configuration (SETUP/PRESETS).
2.
From the Operating Menu, select (SETUP/INPUT/REF_CLK/REFWCLK).
In 2X and 4X sampling rate AD and DD operating modes, the reference clock frequency can
be set to 1X or 2X. From the Operating Menu, select (SETUP/INPUT/REF_FRQ/1X_REF or
2X_REF). NOTE: If a 2X reference clock is used when a 1X input or output data rate is
selected, there can be an output phase ambiguity between multiple Model Twos locked
to the same clock. All factory presets have a default 1X clock frequency.
NOTE: The Model Two's word clock output is a floating signal with positive and negative
voltage potentials. This is done to avoid ground loops between multiple Model Twos used
for multichannel A/D conversion. The floating signal is compatible with most CMOS "TTL
compatible" 75
word clock inputs found on modern equipment. A "true" TTL clock input
will draw more current, which may reduce the signal amplitude to below safe TTL trigger
levels. An AC coupled CMOS input word clock distribution amplifier with a ground refer-
enced TTL compatible output can be used to buffer the signal if necessary.
Recording From an Analog Source
When performing 24-bit or 20-bit A/D conversion, setting peak signal levels within 2 dB of
full scale is sufficient. Since the Model Two's 24-bit or 20-bit resolution is so much greater
than 16-bit, it is not necessary to risk signal "overs" by pushing the level to full scale.
Peak signal levels can be transparently increased later using DSP Gain.
A warm up time of at least 30 minutes is recommended prior to A/D conversion or critical
D/A monitoring. The Model Two should be set to an A/D mode during warm up, which
exercises the A/D converters with dither. A/D conversion can be clocked by either the
Model Two's internal clock or an external reference.
Setup for 44.1/48 kHz, 88.2/96 kHz or 176.4/192 kHz A to D Conversion
In all A/D Modes, the Model Two converts analog signals into HDCD 24-bit, 20-bit, or 16-
bit signals. Either 44.1 kHz or 48 kHz clock families are selected in the 44.1/48 Base Rate
Sample Rate Menu (SETUP/MODE/44.1_X or 48_X).
P A C I F I C
Rev. C - January 2002
Model Two HDCD
M I C R O S O N I C S
®
27
®
User's Manual
I N C .
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