FMS6346_06 Datasheet, PDF (1/11 Pages) Fairchild Semiconductor – Six Channel, 6th Order SD/HD Video Filter Driver

March 2006
FMS6346
Six Channel, 6th Order SD/HD Video Filter Driver
Features
■ Three selectable sixth-order 8/32MHz (SD/HD) filters
■ Three fixed sixth-order 8MHz (SD) filters
■ Transparent input clamping
■ Single video load drive (2V_pp, 150Ω, A_V = 6dB)
■ AC or DC-coupled inputs
■ AC or DC-coupled outputs
■ DC-coupled outputs eliminate AC-coupling capacitors
■ Low power
■ 5V only
■ Robust (12kV HBM) output ESD protection
■ Lead (Pb) free packages - TSSOP-20
Applications
■ Cable and satellite set-top boxes
■ DVD players
■ HDTV
■ Personal Video Recorders (PVR)
■ Video On Demand (VOD)
Block Diagram
Description
The FMS6346 Low Cost Video Filter (LCVF) is intended to
replace passive LC filters and drivers with a low-cost integrated
device. Six 6th order Butterworth filters provide improved image
quality compared to typical passive solutions. The combination
of low power Standard Definition (SD) and High Definition (HD)
filters greatly simplify DVD video output circuitry. Three channels
offer fixed SD filters while the other three are selectable
between SD and HD filters.
The FMS6346 offers a fixed gain of 6dB. A metal option is available
that provides a fixed gain of 9dB, offering even more flexibility.
The FMS6346 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 applications
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 will be offset approxi-
mately +280mV at the output.
SD IN1
SD IN2
SD IN3
SD/HD IN1
Transparent Clamp
6dB
Transparent Clamp
6dB
Transparent Clamp
6dB
8MHz, 6th order
Transparent Clamp
6dB
SD OUT1
SD OUT2
SD OUT3
SD/HD OUT1
SD/HD IN2
Transparent Clamp
6dB
SD/HD OUT2
SD/HD IN3
Transparent Clamp
SD/HD
6dB
Selectable
8/32MHz
6th order
SD/HD OUT3
FMS6346 Rev. 1B
1
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