SSM2160_03 Datasheet, PDF (14/16 Pages) Analog Devices – 6-Channel, Serial Input Master/Balance Volume Controls

SSM2160
that is assigned to the connector used on your PC if different
from the default LPT1.
Windows Control Panel
The control panel contains all the functions required to control
the SSM2160, and each feature is described below. A mouse is
needed to operate the various controls. It is possible to overload
the VCA by incorrect input levels and master and control settings.
If you have not read the sections of the data sheet regarding
control planning, do so now. While no damage will occur to
the SSM2160, the results will be unpredictable.
Master Volume
The master volume fader controls the 7-bit word that deter-
mines the attenuation level. There are 128 levels (2⁷) that range
from 0 dB attenuation to –127 dB attenuation. To change the
level, simply click the up or down arrows or click in the space
directly above or below the fader knob, or drag the knob up or
down to its desired position. (Drag refers to placing the screen
cursor arrowhead on the control, pressing and holding the left
mouse button while moving the arrow to the desired position.)
Master Mute
Below the master volume fader is the Master Mute button. Click
this button to mute all channels. Clicking it again will unmute all
channels. The application defaults to Mute when started. Mute
reduces outputs to approximately –95 dB below inputs up to 0 dBu.
Channel Volume
Each of the channel fader controls can be set to one of 32 levels
of gain, from 0 dB to 31 dB. See the previous section on Master
Volume for details.
Channel Mute
Same function as Master Mute but on a channel basis. Due to
the design limitations, muting an individual channel results in
an increased distortion level of the unmuted channels. Users must
determine if this condition is acceptable in their application.
Channel Balance
The channel balance fader adjusts all channels over their range
without affecting the master volume setting. Relative channel
differences will be maintained until the top or the bottom of
the range is reached. The master volume fader does the same
function as this fader, which was made available for evaluation
convenience.
Master and Channel Fades
Both master and channel fades can be achieved by pressing the
MEM 1 button when levels are at a desired starting position and
the MEM 2 button at the desired ending position. Fade controls
individual channels, and Master Fade controls the master volume.
Fade Time sets timing from 0.1 (fastest) to 9.9 (slowest). Press
Fade to commence operation. If Fade is pressed again, a fade
back to the starting point will occur. The Jump button causes a
direct jump to the opposite memory position.
Halt
Halt is a software interrupt in case of a problem or to stop a
long fade time.
Update
Data currently on display is resent to the SSM2160. This is
useful when parts are being substituted in the evaluation board,
or when the interface cable is changed.
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REV. A