FMS6646_09 Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – Six Channel, SD/HD 1080p Video Filter Driver

November 2009
FMS6646
Six Channel, SD/HD 1080p Video Filter Driver
Features
ƒ Three Selectable 8/75MHz (SD/HD 1080p) Filters
ƒ Three Fixed 8MHz (SD) Filters
ƒ Transparent Input Clamping
ƒ Single Video Load Drive (2VPP, 150Ω, AV = 6dB)
ƒ AC- or DC-Coupled Inputs
ƒ AC- or DC-Coupled Outputs
ƒ DC-Coupled Outputs Eliminate AC-Coupling
Capacitors
ƒ Low-Power
ƒ Robust Output ESD Protection: 9kV HBM
Applications
ƒ Cable and Satellite Set-Top Boxes
ƒ DVD Players
ƒ HDTV
ƒ Personal Video Recorders (PVR)
ƒ Video On Demand (VOD)
Description
The FMS6646 Low Cost Video Filter (LCVF) is intended
to replace passive LC filters and drivers with a low-cost
integrated device. Six Butterworth filters provide
improved image quality compared to typical passive
solutions. The combination of low-power Standard-
Definition (SD) and High-Definition (HD 1080p) filters
greatly simplifies DVD video output circuitry. Three
channels offer fixed SD filters, while the other three are
selectable between SD and HD filters.
The FMS6646 offers a fixed gain of 6dB.
The FMS6646 may be directly driven by a DC-coupled
DAC output or an AC-coupled signal. Internal diode
clamps and bias circuitry may be used if AC-coupled
inputs are required (see the Applications Information
section for details).
The outputs can drive AC- or DC-coupled single (150Ω)
video loads. DC-coupling the outputs removes the need
for output coupling capacitors. The input DC levels are
offset approximately +280mV at the output.
Ordering Information
Part Number
Operating
Temperature Range
Gain Setting
Eco Status ^Package
Packing
Method
FMS6646MTC20X
-40°C to +85°C
6dB
RoHS
TSSOP-20 2500 / Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html
SD IN1
Transparent Clamp
6dB
SD OUT1
SD IN2
Transparent Clamp
6dB
SD OUT2
SD IN3
SD/HD 1080p IN1
Transparent Clamp
6dB
8MHz, 6 ^th order
Transparent Clamp
6dB
SD OUT3
SD/HD 1080p OUT1
SD/HD 1080p IN2
Transparent Clamp
6dB
SD/HD 1080p OUT2
SD/HD 1080p IN3
Transparent Clamp
6dB
F_{cSEL SD/HD}
© 2009 Fairchild Semiconductor Corporation
FMS6646 • Rev. 1.0.2
Figure 1. Block Diagram
SD/HD 1080p OUT3
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