
FMS6690 Rev. 2B
1
www.fairchildsemi.com
January 2006
FMS6690
Six
Channel,
6th
Or
der
SD/PS/HD
Video
Filter
Driver
FMS6690
Six Channel, 6th Order SD/PS/HD Video Filter Driver
Features
■ Three selectable sixth-order 15/32MHz (PS/HD) lters
■ Three xed sixth-order 8MHz (SD) lters with muxed input
■ Transparent input clamping
■ Single video load drive (2Vpp, 150, AV = 6dB)
■ AC or DC-coupled inputs
■ AC or DC-coupled outputs
■ DC-coupled outputs eliminate AC-coupling capacitors
■ Low power
■ 5V only
■ Lead (Pb) free packages - TSSOP-20
Applications
■ Cable and satellite set-top boxes
■ DVD players
■ HDTV
■ Personal Video Recorders (PVR)
■ Video On Demand (VOD)
Description
The FMS6690 Low Cost Video Filter (LCVF) is intended to
replace passive LC lters and drivers with a low-cost integrated
device. Six 6th order Butterworth lters provide improved image
quality compared to typical passive solutions. The combination
of low power Standard Denition (SD), Progressive Scan (PS),
and High Denition (HD) lters greatly simplify DVD video output
circuitry. Three channels offer xed SD lters and feature an
additional muxed input, while the other three channels are
selectable between PS and HD lters. The FMS6690 offers a
xed gain of 6dB.
The FMS6690 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 (150) 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.
Block Diagram
SD IN1
Selectable
15/32MHz
6th order
6d
B
Transparent Clamp
6d
B
Transparent Clamp
6d
B
Transparent Clamp
6d
B
Transparent Clamp
6d
B
Transparent Clamp
6d
B
Transparent Clamp
8MHz, 6th order
FcSEL PS/HD
SD IN2
SD IN3A
SD OUT1
SD OUT2
SD OUT3
PS/HD IN1
PS/HD IN2
PS/HD IN3
PS/HD OUT2
PS/HD OUT3
PS/HD OUT1
SD IN3B
MUXSEL A/B