Aes3 input, Power supply – Grass Valley 8920MUX User Manual
Page 43
8920MUX Instruction Manual
43
Functional Description
CPU
The CPU embedded processor provides the interface between the user and
all the processing logic inside 8920MUX, as well as communication
between a host processor and the 8920MUX.
The CPU also contains:
•
FLASH memory – stores data for FPGA programming and configura-
tion,
•
Address decoder,
•
Address Latch,
•
Extended address register for FLASH memory,
•
EEPROM – Stores calibration and user setup data,
•
Network interface, and
•
ISP voltage regulator
AES3 Input
The 8920MUX board has two audio inputs that can be configured to be
either AES3, 110 ohm balanced with rear connector adapter, or two AES3id,
75 ohm unbalanced coax BNC connectors. Refer to
.
The audio input signal passes through the AES3 input processor and
re-clocker before it is multiplexed.
Power Supply
From the external source +12V, the on-board supply provides +5 V, -5 V and
+3.3 V for the 8920MUX. The power supply uses a monolithic switching
power supply operating in Buck mode. Buck mode switching regulators
are used to generate a lower voltage from higher voltage input. If the
supply ever activates its protective crow bar diode, a high current will be
developed and the input fuse, F1 will blow.