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It is quoted in SLEA073A TVP5158 Layout guidelines as follows:
· VIN_x_P and VIN_x_N should be routed side by side as differential lines. The clearance between twotraces should two to three times the trace width.· Maintain a CVBS video input trace impedance of 75ohm.
My concern is that, according to our stack up, to route VIN_x_P and VIN_x_N lines as differential, with 75 ohm impedance, we have to route it with 6 mil trace width and 4 mil tolerance, which violates the 1st point quoted.
Please let me know if it is ok to proceed?
The main concern is to maintain an impedance as close as possible to 75R. However this is achieved is not critical and should be adapted to your specific layout constraints.
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