Design Support


Unshielded twisted pair (UTP) cables have long been used to transmit data over long distances, starting with telephone line networks. As a result of the relatively low cost, these cables have also been adopted for various uses including video distribution. All UTP cables attenuate the signal over frequency with maximum attenuation at maximum signal frequency. This attenuation will also increase as the cable length increases. This application note focuses on a continuously-adaptable equalization technique of Category-5 enhanced (Cat5e) cable for applications intended to be used with various length of Cat5e cable. As an example, a voltage-controlled amplifier (VCA) implementation is developed for standard video distribution for distances up to 500 feet (152.4 m).