ML6415

The ML6415 is a dual Y/C 4th-order Butterworth lowpass video fi lter optimized for minimum overshoot and fl at group delay. The device also contains a summing circuit to generate fi ltered composite video, an audio trap and group delay compensation circuit to notch-out audio, providing an area for the addition of the FM audio carrier(s) and mimic the group delay distortion introduced at the transmitter. The group delay predistortion compensates for the nominal TV receiver IF fi lter distortion.

In a typical application, the Y and C input signals from DACs are AC coupled into the fi lter. Both channels have DC restore circuitry to clamp the DC input levels during video sync. The Y and C channels use a separate feedback clamp. The clamp pulse is derived from the Y channel.

The outputs are AC coupled. The Y, C, CV, and modulator outputs can drive 2Vp-p into a 150W load (1Vp-p 75W  coax load). The Y, C, CV, and notch channels have a gain of approximately 2 (6dB) with 1Vp-p input levels.