FMS6690 Six Channel, 6th Order SD/PS/HD Video Filter Driver

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FMS6690 Six Channel, 6th Order SD/PS/HD Video Filter Driver

January 2006

FMS6690 Six Channel, 6th Order SD/PS/HD Video Filter Driver
Features
Three selectable sixth-order 15/32MHz (PS/HD) filters Three fixed sixth-order 8MHz (SD) filters 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

Description
The FMS6690 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), Progressive Scan (PS), and High Definition (HD) filters greatly simplify DVD video output circuitry. Three channels offer fixed SD filters and feature an additional muxed input, while the other three channels are selectable between PS and HD filters. The FMS6690 offers a fixed 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 approximately 280mV at the output.

Applications
Cable and satellite set-top boxes DVD players HDTV Personal Video Recorders (PVR) Video On Demand (VOD)

Block Diagram
SD IN1
Transparent Clamp
6dB

SD OUT1

SD IN2 SD IN3A

Transparent Clamp

6dB

SD OUT2

Transparent Clamp

6dB

SD OUT3

SD IN3B MUXSEL A/B PS/HD IN1
Transparent Clamp

8MHz, 6th order

6dB

PS/HD OUT1

PS/HD IN2

Transparent Clamp

6dB

PS/HD OUT2

PS/HD IN3

Transparent Clamp

6dB

PS/HD OUT3

FcSEL PS/HD

Selectable 15/32MHz 6th order

FMS6690 Rev. 2B

1

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