CMU Instrument Design and Function Description
1100.4903.82 3.15 E-4
Option AUDIO-GEN. + ANA. CMU-B41
The Option AUDIO-GEN. + ANA. constitutes the central AF-board which contains all circuit parts for
generation of AF output and analysis of AF input signals. The Option AUDIO-GEN. + ANA. is a plug-in
module in HVC design.
Design
At the top of the module, eight MMCX connectors are attached, which
serve as inputs or outputs for AF and clock signals and are routed to
the respective modules or the integrated front panel with appropriate
coax cables. There is also a coax cable to the loudspeaker on the front
panel.
Connection
The plug-in module AUDIO-GEN. + ANA. is inserted in the CMU on the
right side on MOTHERBOARD2 using a 96-pin FUTURE-bus
connector.
Function
The Option AUDIO-GEN. + ANA. contains one DSP MODULE, a clock
generation circuit, an analog input section and an analog output section
Further there is a power amplifier for the loudspeaker on this board
The DSP MODULE is a sandwich module, which controls the signal
path, level and frequency of the AF output generator and also the
signal path, attenuation and analysis of the AF input analyzer.
The DSP MODULE is connected via an ISA-Bus Interface to the
FRONTMODULE CONTROLLER of the CMU.
The clock generation circuit gets from the REFERENCE BOARD a
27.7MHz signal over a coax cable and a MMCX connector. This signal
feeds the DSP MODULE and is converted in a PLL circuit to 24.576
MHz.
Over a divider by 2 to. This clock signal divided by 2 (12.288MHz) is
used for the A/D and D/A Converter IC and the serial links.
Analog Input Section
Over the BNC connectors AFIN and AUX1 at the front of the CMU and
the coax cables the AF signal comes to the analog input section, which
provides two independent input channels.
These two Input channels could be used as one balanced or two
unbalanced channels. Over an input attenuator and an various gain
amplifier per channel the AF signal comes to the A/D Converter, which
sends over a serial link connection the digital values to the DSP
MODULE.
Analog Output Section
For the AF-Generator the DSP MODULE sends the digital values over
a serial link connection to the D/A Converter of the analog output
section.
The analog output section provides two independent output channels,
which could be used as one balanced or two unbalanced channels.
Over a various gain amplifier and a switchable output attenuator the
AF signal comes to the MMCX connectors, which are connected via
coax cables to the BNC connectors AFOUT and AUX2 at the front of
the CMU.
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