FMS6400 Dual Channel Video Drivers with Integrated Filters and Composite Video Summer

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FMS6400 Dual Channel Video Drivers with Integrated Filters and Composite Video Summer

September 2005

FMS6400 Dual Channel Video Drivers with Integrated Filters and Composite Video Summer
Features
7.1 MHz 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 0.1 dB 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

Description
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 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 are clamped during sync to establish the appropriate output voltage referen
ce 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.

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

Block Diagrams
VCC 7 Sync Strip Reference and Timing
0 or 6dB

YIN

1

8

YOUT

gM
250mV

S

6

CVOUT

gM
250mV

CIN

4

0 or 6dB

5

COUT

3 GND

2 ASEL

2004 Fairchild Semiconductor Corporation

1

www.fairchildsemi.com

FMS6400 Rev. 1A

FMS6400 Datasheet Fairchild Download PDF

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FMS6400 DATASHEET