General Description

The ML6415 is a dual Y/C 4th-order Butterworth lowpass video filter optimized for minimum overshoot and flat group delay. The device also contains a summing circuit to generate filtered 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 filter distortion.

Features

• 7.1MHz Y and C filters, with CV out

• 14dB notch at 4.5MHz for sound trap

• 42dB stopband attenuation at 27MHz on Y, C, and CV

• Better than 1dB flatness to 4.5 MHz on Y, C, and CV

• RF Modulator output differential group delay between 400kHz and 3.58MHz is typically -170ns.

• No external frequency select components or clocks

• 9ns group delay flatness on Y, C, and CV output

• AC coupled inputs and outputs

• 0.4 differential gain on Y, C and CV channels, 0.4º differential phase on Y, C and CV channels

• 0.8 total harmonic distortion on all channels

• DC restore with low tilt

Applications

• Cable Set-top Boxes

• Satellite Set-top Boxes

• DVD Players