Datasheet > FMS6406_06

FMS6406_06

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		/
页数	文件大小	规格书
12页	651K
描述
Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation

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FMS6406_06 数据手册

August 2006

FMS6406

Precision S-Video Filter with Summed Composite

Output, Sound Trap, and Group Delay Compensation

Features

Description

■ 7.6MHz 5th-order Y,C ﬁlters with composite summer

The FMS6406 is a dualY/C 5th-order Butterworth lowpass

video ﬁlter optimized for minimum overshoot and ﬂat

group delay. The device also contains a summing circuit

to generate ﬁltered composite video, an audio trap and

group delay compensation circuit. The audio trap removes

videoinformationinthespectrallocationofthesubsequent

RF audio carrier. The group delay circuit predistorts the

signal to compensate for the inherent receiver IF ﬁlter’s

group delay distortion.

■ 14dB notch at 4.425MHz to 4.6MHz for sound trap

capable of handling stereo

■ 50dB stopband attenuation at 27MHz on Y, C,

and CV outputs

■ Better than 0.5dB ﬂatness to 4.2MHz on Y, C,

and CV outputs

■ Equalizer and notch ﬁlter for driving RF modulator with

group delay of -180ns

■ No external frequency selection components or clocks

■ < 5ns group delay on Y, C, and CV outputs

■ AC coupled inputs

In a typical application, the Y and C input signals from

DACs are AC-coupled into the ﬁlters. Both channels have

DC-restore circuitry to clamp the DC-input levels during

video sync. The Y and C channels use separate feedback

clamps. The clamp pulse is derived from the Y channel.

■ AC or DC coupled outputs

■ Capable of PAL frequency for Y, C, CV

■ Continuous Time Low Pass Filters

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

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

consists of a series 75W impedance matching resistor

connected to a terminated 75W line, this presents a total

of 150W of loading to the part. Adual load would be two of

these in parallel which would present a total of 75W to the

part. The gain of the Y, C and CV signals is 6dB with 1V_pp

input levels. All video channels are clamped during sync

to establish the appropriate output voltage reference levels.

■ <1.4% differential gain with 0.7° differential phase

on Y, C, and CV channels

■ Integrated DC restore circuitry with low tilt

Applications

■ Cable set-top boxes

■ Satellite set-top boxes

■ DVD players

Block Diagram

VCC

Sync Strip

Reference

and Timing

Y_IN

6dB

Y_OUT

250mV

CV_OUT

Notch

Group

Delay

EQ_NOTCH

C_IN

6dB

C_OUT

GND

Ordering Information

Operating Temp

Range

Packaging

Method

Part Number

Package

Pb-Free

SOIC-8

Yes

0°C to +70°C

Tube

FMS6406CS

FMS6406CSX

Tape and Reel

FMS6406 Rev. 4.0.4

ꢀ

www.fairchildsemi.com

12 3 4 5 6 7...12

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