Studio Technologies 5120 2014 - Manual (Page 8)

Issue 5, October 2014 Model 5120 User Guide
Page 8 Studio Technologies, Inc.
Model 5120
Line/IFB Output Module
and related applications. It was specifically
selected for the Model 5120 because of its
small size.
The digital audio input signal is intended
to have a sample rate of 48 kHz, although
the less-common 32 kHz and 44.1 kHz
are also compatible. The recommended
nominal level of the connected digital
audio source will depend on the specific
Model 5120 version being installed. For
Model 5120S (SMPTE) version modules
the nominal level should be –20 dBFS. For
Model 5120E (EBU) version modules the
nominal level should be –18 dBFS.
DC Power
A 4-position header, located adjacent to
the analog audio input connector, is used
to connect DC power to the Model 5120.
A source of nominal 12 volts DC, with an
acceptable range of 10 to 18, is required
for Model 5120 operation. The maximum
current is 600 milliamperes at 12 volts DC.
Only pins 1 and 2 of the connector are
used to connect to DC power; pins 3 and 4
can remain unconnected. RS-485 data bus
connections linking a Model 5190 Remote
Access Card to other 5100-Series mod-
ules can connect to pins 3 and 4 without
creating a problem. Refer to Figure 3 for
details.
Like the analog audio inputs, the mating
connector is compatible with the AMP MTA
series of IDC receptacles. It is, however,
a 4-position rather than 5-position connec-
tor. For 22 AWG wire the closed-end-style
receptacle is AMP 3-643813-4; the feed-
through-style receptacle, used for busing
connections, is AMP 3-644540-4. The body
color for both these receptacles is red.
Refer to Appendix A of this guide for addi-
tional connector details.
Mounting
The Model 5120 is intended for mounting
into an installation-specific enclosure or
rack panel. Refer to Appendix B for the
required mounting opening and screw loca-
tions. Please contact the factory to discuss
mounting options.
Configuration
The Model 5120 does not require any con-
figuration for correct operation to take place.
While the unit does contain a 5-position DIP
switch it is not currently utilized. Should a
source of AES3-compliant digital audio be
connected it will automatically be used as
the source of the two audio input channels.
If a digital audio source is not connected,
or the connected digital audio signal does
not correctly “lock” to the input circuitry, the
analog audio inputs will be active.
In most applications only the desired au-
dio source will be connected and the “auto
input select” function will not serve in a
run-time role. However, if physical con-
nections are made to both the analog and
digital inputs the “auto input select” function
can be used to allow selection from among
the two inputs as the needs of the applica-
tion dictates. The presence or absence of
the digital audio input will be used to select
which input is active.
DC Power Input
1. – DC (Common)
2. +DC (10-18 volts)
3. Not used
4. Not used
Figure 3. DC Power input interface connector