FMS6400-1

FMS6400-1 — Dual-Channel Video Driver with Integrated Filters and Composite Video Summer October 2009 FMS6400-1 Dual-Channel Video Driver with Integrated Filters and Composite Video Summer Features ƒ 5.0 MHz 5th-Order Y, C filters with Composite Summer ƒ Selectable 0dB or 6dB Gain ƒ 50dB Stop-Band Attenuation at 27MHz on Y, C, and CV Outputs ƒ No External Frequency Selection Components or Clocks ƒ AC-Coupled Inputs ƒ AC-or DC-Coupled Outputs ƒ Continuous Time Low-Pass Filters ƒ 0.4% / 0.4° Differential Gain/Phase on Y, C, and CV Channels ƒ Integrated DC-Restore Circuitry with Low Tilt ƒ Lead (Pb) Free SOIC-8 Package Description The FMS6400-1 is a dual Y/C 5th-order Butterworth lowpass video filter optimized for minimum overshoot and flat group delay. The device 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 DCrestore 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 2VPP, AC or DC coupled, into either a single or dual video load. A single video load consists of a series-75Ω impedancematching resistor connected to a terminated 75Ω line. This presents a total of 150Ω of loading to the part. A dual load is two of these in parallel, which presents a total of 75Ω to the part. The gain of the Y, C, and CV sign...