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FMS6408
Features

Triple Video Filter Driver for RGB and YUV Signals
Description
The FMS6408 provides three video signal paths including a two-input mux, a video filter and a 6dB gain output driver. The filter bandwidth supports RGB and YUV signals in either NTSC or PAL formats. The video filters approximate a 5th order Butterworth low pass characteristic optimized for minimum overshoot and flat group delay to provide excellent image quality. Four different peaking options are available. The video filters can be bypassed if desired. In a typical application, the RGB or YUV DAC outputs are AC coupled into the filters through the input mux. All channels have DC restore circuitry to clamp the DC input levels during video sync. The clamp pulse derived from the selected Y input controls three independent feedback clamps. All outputs are capable of driving 2Vpp, AC or DC coupled, into either a single (150) or dual (75) video load. The FMS6408 clamp levels can be factory programmed for YUV /RGB (250mV for all channels), YC / YPbPr (250mV on channel 1 and 1.125V on channels 2 and 3) or YC CV (25
0mV on channels 1 and 3 and 1.125V on channel 2). 7.6MHz 5th order RGB/YUV/YC CV filters 50dB stopband attenuation at 27MHz on all outputs Better than 0.5dB flatness to 4.2MHz on all outputs No external frequency selection components or clocks AC coupled inputs and AC or DC coupled outputs Supports both NTSC and PAL luminance bandwidth Continuous time low pass filters for video anti-aliasing or reconstruction applications 1% differential gain with 0.5 differential phase on all channels Integrated DC restore circuitry with low tilt

Applications
Cable set top boxes Satellite set top boxes Terrestrial set top boxes DVD players Personal Video Recorders (PVR) Video On Demand (VOD)

Functional Block Diagram
INMUX (A/B) BYPASS (BYPASS/FILTER)

YINA YINB 8MHz

6dB

YOUT

gM

250mV Sync Processing

UINA UINB 8MHz

6dB

UOUT

gM

250mV or 1.125V

VINA VINB 8MHz

6dB

VOUT

gM

Factory Selected Clamp and Peaking Levels

250mV or 1.125V

REV. 2C August 31, 2004

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FMS6408 DATASHEET