Unshielded twisted pair (UTP), such as Cat 5e, is primarily designed for local area network (LAN) transmission. Because of its good performance and low cost, it has become economical solution for many other signal transmission applications.
RGB computer graphics and analog HDTV component video (YPbPr) comprise two important categories of analog broadband video signals. These signals suffer from two major impairments when transported over standard four-pair Unshielded Twisted Pair (UTP) cables, such as Cat-5e. One impairment is time dispersion caused by the nonlinear lowpass frequency response of the cable, due to the skin effect. The time dispersion increases the settling times of pixel-to-pixel transitions to the point where information from early pixels spreads into later pixels, causing visible interference. The other impairment is pair-to-pair time skew between the three pairs due to variances in lengths, and therefore propagation delays, between the pairs.
The Analog Devices UTP Cable Auto-Compensation System provides the user with a complete end-to-end UTP cable compensation solution that automatically corrects for cable loss characteristics and pair-to-pair skew. The solution produces an image that exhibits minimal streaking and skew effects with no user intervention required. Adjustments are automatically made whenever the cable is switched.
For more detailed information, please contact ADI customer interaction center. Send email to firstname.lastname@example.org.
1. User Guide
2. MCU firmware HEX file
3. Schematics and PCB layout files