tda6920 Infineon Technologies Corporation, tda6920 Datasheet - Page 13

• Manufacturer Part Number: tda6920
• Description: 7 X 5 Video Matrix Switch
• Manufacturer: Infineon Technologies Corporation

TDA 6920
Functional Description
3.4 Functional Description
The main function of the IC is to switch 7 input video sources to 5 outputs.
Each output can be switched to only one input.
It is possible to have the same input connected to several outputs.
3 of the inputs can be used as non-clamping-input, switching is controlled by
bus.
The clamping function of the other 4 inputs can be switched off by external
resistor divider.
2
All switching possibilities are controlled by the I
C-BUS.
2
All outputs can be switched to low impedance off condition by the I
C-BUS.
Driving 75
load requires external transistors.
The recommended coupling capacitor at each input is 47 nF.
Each clamping input requires a 75
(max. 500
) termination resistor.
Operation without or with a termination resistor greater than 500
causes mal-
function of the new high performance clamping circuit.
Unused input‘s should be directly grounded.
6 x 8 bits are necessary to determine one complete configuration change
(1 addressbyte, 5 databytes).
Minimum configuration change for 1 output needs 2 x 8 bit (1 addressbyte,
1 databyte).
Power on reset state: all 5 outputs switched to input 1, all inputs clamped, Y+C
off.
Wireless Components
3 - 6
Specification, August 1999