Technical manual – LVDS to YPbPr, CVBS converter board 3/9
Product overview
This board converts a LVDS HD video signal to component YPbPr or composite SD (PAL or NTSC).
Format supported are 720p and 1080p/i – up to 1080p25/30 for YPbPr.
The composite SD video corresponds to complete area of the HD 1080p25 or 1080p30 view with letter
box or cropped option to realize 16/9 to 4/3 adaptation.
Output mode is selected with micro switches.
The remote configuration of the camera with a serial communication - TTL or RS232 level - is in
accordance with VISCA protocol.
Synoptics
1. Main functions
•LVDS signal decoding (with FPGA)
•Memorization of the SD image to realize NTSC or PAL interlacing
•SD NTSC / PAL Signal scaling (FPGA)
•NTSC & PAL Coding (SD video encoder)
•YPbPr digital to analog conversion
•TTL/RS232 for remote control
•Power supply of the camera (8 to 12V), and of the board functions (1.2V, 1.8V and 3.3V)
Specifications
2. LVDS camera input
•LVDS (Y, Cb, Cr, Sync, Clk) 5 channels 8 bits (“Channel link format”)
•LVDS clock: 74,25MHz or 148,5MHz
•HD video formats: 720p50/60, 1080p25/30, 1080i50/60, 1080p50/60
•KEL 30 ways connector
3. SD Analog Outputs
•VBS and YC :1V pp, 75ohm
•NTSC (with 1080p30/29,97 or 1080p60/59,94 configuration)
•PAL (with 1080p25 or 1080p50 configuration)
•“Letter box” or “crop” conversion from HD 16/9 to SD 4/3 aspect ratio
•Delay from LVDS inputs to analog outputs: about 40ms for PAL and moving from 33ms to
67ms for NTSC
•MOLEX 10 ways connector
4. HD Analog Outputs
•YPbPr :1V pp, 75ohm
•From 720p50 to 1080p30 video formats
•MOLEX 10 ways connector
5. Serial control
•VISCA (SONY) protocol
•Baud rate: 9600, 19200, 38400, 115200
•Logical level +3V3 on MOLEX 10 ways connector
•RS232 level on MOLEX 3 ways connector
