FMS6410B_06 Datasheet, PDF (1/8 Pages) Fairchild Semiconductor – Dual-Channel Video Drivers with Integrated Filters and Composite Video Summer

October 2006
FMS6410B
Dual-Channel Video Drivers with Integrated Filters and
Composite Video Summer
Features
■ 7.1MHz fifth-order Y,C filters with composite summer
■ 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 on Y, C, and CV outputs
■ AC-coupled inputs
■ AC- or DC-coupled outputs
■ Capable of PAL frequency selection components or
clocks
■ 0.3% differential gain with 0.2° differential phase on
Y, C, and CV channels
■ Integrated DC restore circuitry with low tilt
■ Lead-free SOIC-8 package
Applications
■ Cable and satellite set-top boxes
■ DVD players
■ Personal Video Recorders (PVR)
■ Video On Demand (VOD)
Description
The FMS6410B is a dual Y/C fifth-order Butterworth low-
pass video filter optimized for minimum overshoot and
flat group delay. The device also contains a summing cir-
cuit 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 cou-
pled, 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 pre-
sents 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 signals is 6dB with
1V_pp input levels. All video channels are clamped during
sync to establish the appropriate output voltage refer-
ence levels.
Block Diagrams
YIN
1
Sync Strip
Reference and
Timing
VCC
7
6dB
8 YOUT
CIN
4
© 2004 Fairchild Semiconductor Corporation
FMS6410B Rev. 1.0.2
gM
250mV
+
Σ
+
gM
250mV
6dB
3
GND
Figure 1. Block Diagram
6 CVOUT
5 COUT
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