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FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation
August 2006
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
■
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■
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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 2V
pp
, AC or DC-coupled,
into either a single or dual video load. A single video load
consists of a series 75W impedance matching resistor
connected to a terminated 75W line, this presents a total
of 150W of loading to the part. A dual load would be two of
these in parallel which would present a total of 75W 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 reference levels.
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
FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation
Absolute Maximum Ratings
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The
device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are
not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defines the conditi-
ons for actual device operation.
Parameter
V
CC
Analog and Digital I/O
Output Channel - Any One Channel (Do Not Exceed)
Min.
-0.3
-0.3
Max.
6
V
CC
+ 0.3
100
Unit
V
V
mA
Notes:
Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if operating conditions are not exceeded.
