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Digital Video
4.2 32X32 Digital Video Matrix Card Continued:
4.3 PS70V Power Supply
4
F UNCTIONAL
DESC RIPTI ON
page 4.2
Functional
Input Equalizers
The 32 video inputs are terminated into 75 ohms on the matrix card. U1
thru U16 and U78 thru U93 provide automatic input cable equalization for
the inputs. The inputs are equalized for 0 to 240 meters of Belden 8281 or
equivalent cable for data rates up to 270Mbit/s and 0 to 150 meters for
data rates up to 360Mbit/s.
Output Drivers
U17 thru U48 are used to drive the outputs for the 32X32 Digital Video
Matrix Card.
Power Regulators
U73 is a switching regulator that creates -5.0 volts @ 5 amps to power the
crosspoint matrix, input, and output ICs. U75 is a switching regulator that
creates -2.00 volts @ 2 amps to power the video transmission line termi-
nators. U72 is a +5 volt regulator which is used to the control logic.
U77 provides power to the backplane to drive the chassis fan. U76 pro-
vides power to the heatsink fan used to cool U49. U95 monitors all pri-
mary circuit card voltages for out of voltage range conditions (±15%). If a
fault is sensed CR5 will light and controller will report the error condition.
CR7 indicates that power is applied to the 32X32 Digital Video Matrix
Card.
The PS70V Power Supply is an unregulated power source that supplies ±
voltages to the Cougar Digital Video Frame.
Each power supply produced by PESA has an AC Select Switch that al-
lows you to select the required voltage range. This switch is accessed by
removing the plug-in supply. Insure that power is off before changing the
switch setting. A separate jumper, located under the plastic safety cover
surrounding the switch is used to add 15 volts to each switch setting. Us-
ing only the switch, the nominal (± 10%) AC line voltages available are
100, 120, 140, 200, 220, and 240. If the jumper is also moved, these volt-
ages become 115, 135,155, 215, 235, and 255.
Section 4
4/98
P/N 81905903440
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