FMS6246 Six Channel, 6th Order SD/PS Video Filter Driver

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FMS6246 Six Channel, 6th Order SD/PS Video Filter Driver

March 2006

FMS6246 Six Channel, 6th Order SD/PS Video Filter Driver
Features
Three selectable sixth-order 8/15MHz (SD/PS) filters Three fixed sixth-order 8MHz (SD) filters 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 Robust (12kV HBM) output ESD protection Lead (Pb) free packages- TSSOP-20

Description
The FMS6246 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 Progressive Scan (PS) filters greatly simplify DVD video output circuitry. Three channels offer fixed SD filters while the other three are selectable between SD and PS filters. The FMS6246 offers a fixed gain of 6dB. A metal option is available that provides a fixed gain of 9dB, offering even more flexibility. The FMS6246 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 outp
ut.

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

Transparent Clamp

6dB

SD OUT2

SD IN3

Transparent Clamp

6dB

SD OUT3

8MHz, 6th order

SD/PS IN1

Transparent Clamp

6dB

SD/PS OUT1

SD/PS IN2

Transparent Clamp

6dB

SD/PS OUT2

SD/PS IN3

Transparent Clamp

6dB

SD/PS OUT3

FcSEL PS/HD

Selectable 8/15MHz 6th order

FMS6246 Rev. 1B

1

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