The FMS6400 is a dual Y/C 5th 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. In a typical application, the Y and C input signals from DACs are AC coupled into the filters. Both channels have DC restore circuitry to clamp the DC input levels during video sync. The Y and C channels use separate feedback clamps. The clamp pulse is derived from the Y channel.

All outputs are capable of driving 2V_PP, AC or DC coupled, into either a single or dual video load. A single video load consists of a series 75ohm impedance matching resistor connected to a terminated 75ohm line. This presents a total of 150ohm of loading to the part. A dual load would be two of these in parallel which would present a total of 75ohm to the part. The gain of the Y, C and CV signals can be selected for 0dB or 6dB with 1V_PP input levels. All video channels are clamped during sync to establish the appropriate output voltage reference levels.

The FMS6400 typical cutoff frequency is 7.1MHz. Option for a lower cutoff frequency of 5MHz is available. Please refer to the FMS6400-1 datasheet for further information.

• 7.1MHz 5th order Y, C filters with composite summer
• Selectable for 0dB or 6dB gain
• 50dB stopband attenuation at 27MHz on Y, C and CV outputs
• Better than 0.1dB flatness to 4.5MHz on Y,C and CV outputs
• No external frequency selection components or clocks
• < 5ns group delay deviation on Y, C and CV outputs
• AC-Coupled Inputs
• AC or DC-Coupled Outputs
• Capable of PAL frequency selection components or clocks
• 0.3%/0.2° differential gain/phase on Y,C and CV channels
• Integrated DC restore circuitry with low tilt
• Lead (Pb) Free SOIC-8 Package

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