Maxim has introduced the MAX7474, claimed to be the first adaptive equaliser for composite video over twisted-pair cables.
The device automatically compensates for cable losses that occur in the transmission of a composite video signal with blanking and sync (CVBS) over UTP cable lengths of up to 300 m. It also improves signal quality for cable lengths up to 600 m.
The device intelligently adapts to cable length and adjusts the video signal gain approximately, and it automatically switches over to fixed equalisation for monochrome CVBS. It is compatible with NTSC and PAL standards.
It monitors the sync and colour burst of the colour video signal at the output (OUT), and adjusts the gains accordingly. When it detects monochrome signals, it applies an AGC function together with user-selectable fixed equalisation to the signal.
It continuously adjusts the low-frequency luminance band gain and the higher frequency chrominance band gain to correct for cable losses anywhere between 0 and 300 m of CAT2-7 cable.
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