Cascade Video Input Electrical Specifications
The VIDEO connector has one Cascade Video Input port.
The ports have two pins named VID_IN_CAS and VRN_IN_CAS respectively. The "hot conductor" of the transmission line transporting the video signal "xx" has to be connected to the VID_IN_CAS pin, while the "cold conductor" of the transmission line has to be connected to the corresponding VRN_IN_CAS pin. If the transmission line is a coaxial line, the "hot conductor" is the inner conductor, and the "cold conductor" is the outer conductor.
A fixed 75Ω termination resistor is inserted across VID_IN_CAS and VRN_IN_CAS.
When this is applied on the VIDEO connector port, the cascade video signal flows through a common-mode choke, which attenuates the common-mode noise present on the video signal. The VRN_IN_CAS pin is connected to the analog GND through one winding of the common-mode choke. The VID_IN_CAS pin is connected to the second winding.
The filtered video signal is available on the VIDEO CASCADE connector. It is applied to the Video Output multiplexer through a coupling capacitor.
Cascade Video Input circuit
Cascade Video Input - DC characteristics
Parameter |
Min |
Typ. |
Max |
Units |
Input voltage range - Absolute max rating |
-2 |
|
+2 |
V |
Input impedance |
|
75 |
|
Ω |