FMS6404CSX datasheet(2/11 Pages) ONSEMI

2 / 11 page

October 2011

www.fairchildsemi.com

FMS6404 • Rev. 1.0.0

FMS6404

Precision Composite Video Output with Sound Trap and

Group Delay Compensation

Features

 7.6MHz 5th-Order Composite Video Filter

 14dB Notch at 4.425MHz to 4.6MHz for Sound Trap

Capable of Handling Stereo

 50dB Stopband Attenuation at 27MHz on

CV Output

 > 0.5dB Flatness to 4.2MHz on CV Output

 Equalizer and Notch Filter for Driving RF Modulator

with Group Delay of -180ns

 No External Frequency Selection Components

or Clocks

 < 5ns Group Delay on CV Output

 AC-Coupled Input

 AC- or DC-Coupled Output

 Capable of PAL Frequency for CV

 Continuous Time Low-Pass Filters

 <1.4% Differential Gain with 0.7° Differential Phase

on CV Channel

 Integrated DC Restore Circuitry with Low Tilt

Applications

 Cable Set-Top Boxes

 Satellite Set-Top Boxes

 DVD Players

Description

The FMS6404 is a single composite video 5th-order

Butterworth low-pass video filter optimized for minimum

overshoot and flat group delay. The device contains an

audio trap that removes video information in a spectral

location of the subsequent RF audio carrier. The group

delay compensation circuit pre-distorts the signal to

compensate for the inherent receiver intermediate

frequency (IF) filter’s group delay distortion.

In a typical application, the composite video from the

DAC is AC coupled into the filter. The CV input has DC-

restore circuitry to clamp the DC input levels during

video synchronization. The clamp pulse is derived from

the CV channel.

All outputs are capable of driving 2VPP, AC- or DC-

coupled, into either a single or dual video load. A single

video load consists of a series 75Ω impedance

matching resistor connected to a terminated 75Ω line.

This presents a total of 150Ω of loading to the part. A

dual load would be two of these in parallel, which

presents a total of 75Ω to the part. The gain of the CV

signal is 6dB with 1VPP input levels. All video channels

are clamped during synchronization to establish the

appropriate output voltage reference levels.

Related Resources

 AN-6024 – FMS6xxx Product Series Understanding

Analog Video Signal Clamps, Bias, DC Restore,

and AC or DC coupling Methods

 AN-6041 – PCB Layout Considerations for Video

Filter / Drivers

Ordering Information

Part Number

Operating

Temperature Range

Package

Packing Method

FMS6404CSX

-40°C to +70°C

8-Lead, Small-Outline Integrated Circuit (SOIC),

JEDEC MS-012, .150" Narrow Body

2500 Units

per Reel

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