SSM2160/SSM2161

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your hard disk from the Analog Devices website to, say,

C:\SSM2160, on the command line type C:\SSM2160\SETUP

and press Return. The software will be automatically installed

and a SSM2160 start-up icon will be displayed. Double-click

the icon to start the application. Under the menu item “Port,”

select the parallel port 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 will be described below. A

mouse is needed to operate the various controls. It is possible

to overload the VCA (Voltage Controlled Amplifier) by incor-

rect input levels, 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 (2

from zero dB attenuation through –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 master volume above 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.

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,” 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.

Should you have any questions regarding the evaluation board

or the SSM2160, please contact the Analog Audio group

applications specialist at (408)562-7520.