FMS6418B Rev. 5G

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www.fairchildsemi.com

General Description

The FMS6418B offers comprehensive filtering for set top box or

DVD applications. This part consists of a triple 6th order filter

with selectable 32MHz or 8MHz frequencies. A 2-to-1 multi-

plexer is provided on each filter. The filters are intended for

either YUV, RGB, or YPbPr signals. All channels accept DC cou-

nals into AC coupled terminated loads. All channels provide

6dB gain, accept 1V ground referenced inputs, and drive AC

coupled loads. The low-pass filters are powered by 3.3V and the

output buffers are powered by 5.0V.

The FMS6418B is a next generation filter solution from Fairchild

Semiconductor addressing the expanding filtering needs for set

top boxes, and DVD players. The product provides selectable

filtering with cutoff frequencies of 32MHz or 8MHz on the RGB/

YUV/YPbPr channels. Thus, the FMS6418B addresses the

requirement for a single set top box to be compatible with a variety

of resolution standards. Multiplexers on the RGB channels provide

further flexibility. For DVD, set-top box, and TV applications, the

product provides filtering and output drive amplification for three

channels of outputs (RGB/YUV/YPbPr).

Applications

DC Levels

At any given time, the input signal’s DC levels must be between

0.0V and 1.3V to utilize the optimal headroom and to avoid clipping

on the outputs.

Single Supply +5V Operation

For low power consumption, the FMS6418B was designed to

instead of 3.3V and still meet specifications, except power con-

sumption. When the 3.3V supply is increased to 5V, the typical

current consumption increases by 5mA. The net effect is the

part dissipates an additional 22 percent of power.

Driving the Digital Pins with 3.3V or 5V Logic