FMS6400-1

The FMS6400-1 is a dual Y/C 5th order Butterworth lowpass video filter optimized for minimum overshoot and flat group delay. The FMS6400-1 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 of FMS6400-1 are capable of driving 2Vpp, AC or DC coupled, into either a single or dual video load. A single video load consists of a series 75 impedance matching resistor connected to a terminated 75 line. This presents a total of 150 of loading to the part. A dual load would be two of these in parallel which would present a total of 75 to the part. The gain of the Y, C and CV signals can be selected for 0dB or 6dB with 1Vpp input levels. All video channels of FMS6400-1 are clamped during sync to establish the appropriate output voltage reference levels.