FMS6410_04 Datasheet, PDF (1/9 Pages) Fairchild Semiconductor – Dual Channel Video Drivers with Integrated Filters

www.fairchildsemi.com
FMS6410
Dual Channel Video Drivers with Integrated Filters
and Composite Video Summer
Video Features
• Dual integrated video low pass reconstruction filters on
outputs
• Composite Video Summer
• Integrated output drivers provide low impedance outputs
and deliver 2VP-P (6dB gain) video into 150Ω.
• 7.1MHz 4^th order video filters
• 7.1MHz Y and C filters, with CV out
• 42dB stopband attenuation at 27MHz on Y, C, and CV
• Better than 1dB flatness to 4.5 MHz on Y, C, and CV
• No external frequency select components or clocks
• 9ns group delay flatness on Y, C, and CV output
• AC coupled inputs and outputs
• 0.4% differential gain with 0.4° differential phase
• Integrated DC Restore / Clamp circuitry with low tilt
Applications
• CCTV
• Cable and Satellite Set top boxes
• DVD players
• Televisions
• Personal Video Recorders (PVRs)
• Video On Demand (VOD)
• Distribution Amplifiers
Functional Block Diagram
General Description
The FMS6410 Dual Channel Video Filter – Driver Chip with
CV Summer offers comprehensive video filtering for set top
box or DVD applications. This part consists of two 4^th order
Butterworth 7.1MHz low pass filters for video signals. The
filters are optimized for low overshoot and flat group delay.
The device also contains a summing circuit to generate
filtered composite video. Integrated video drivers are
included to facilitate a direct drive to the outside world.
In a typical application, the Y and C input signals from
DACs are AC coupled into the filter. Both channels have DC
restore circuitry to clamp the DC input levels during video
sync. The Y and C channels use a separate feedback clamp.
The clamp pulse is derived from the Y channel.
The outputs are AC coupled. The Y, C and, CV outputs are
buffered to drive 2VP-P into a 150Ω load (1VP-P into a
doubly terminated 75Ω coax load) with up to 35pF of load
capacitance at the output pin. The Y, C, and CV channels
have a gain of approximately 2 (6dB) with 1VP-P input
levels. There is an option for the video output to be DC
coupled which limits the drive output to one output on each
channel.
1 YIN
SYNC STRIP, REF,
AND TIMING
6dB
YOUT 8
2
DNC
gM
1V
(Do Not Connect)
3
GND_VIDEO
FMS6410
4 CIN
gM
1V
6dB
7
VCC_VIDEO
CVOUT ₆
COUT 5
REV. 2a February 2004