FMS6406CSX

FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation August 2005 FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Features ■ 7.6MHz 5th order Y,C filters with composite summer ■ 14dB notch at 4.425MHz to 4.6MHz for sound trap capable of handling stereo ■ 50dB stopband attenuation at 27MHz on Y, C and CV outputs ■ Better than 0.5dB flatness to 4.2MHz on Y, C and CV outputs ■ Equalizer and notch filter for driving RF modulator with group delay of -180ns ■ ■ ■ ■ ■ ■ ■ No external frequency selection components or clocks < 5ns group delay on Y, C and CV outputs AC coupled inputs AC or DC coupled outputs Capable of PAL frequency for Y,C,CV Continuous Time Low Pass Filters < 1.4% differential gain with 0.7° differential phase on Y, C and CV channels ■ Integrated DC restore circuitry with low tilt Description The FMS6406 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, an audio trap and group delay compensation circuit. The audio trap removes video information in the spectral location of the subsequent RF audio carrier. The group delay circuit predistorts the signal to compensate for the inherent receiver IF filter’s group delay distortion. 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 2Vpp, AC or DC coupled, into either a single or dual video load. A single video load consists of a series 75Ω impedance matching resistor connected to a terminated 75Ω line, this presents a total of 150Ω of loading to the part. A dual load would be two of these in parallel which would present a total of 75Ω to the part. The gain of the Y, C and CV signals is 6dB with 1Vpp input levels. All video channels are clamped during sync to establish the appropriate output voltage reference levels. Applications ■ Cable set-top boxes ■ Satellite set-top boxes ■ DVD players Ordering Information Model FMS6406 FMS6406 Part Number FMS6406CS FMS6406CSX Lead Free Yes Yes Package SOIC-8 SOIC-8 Container Tube Tape and Reel Pack Qty 95 2500 Temperature range for all parts: 0°C to +70°C. DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICES TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. FMS6406 Rev. 4C www.fairchildsemi.com ©2005 Fairchild Semiconductor Corporation