Datasheet > ML6428CSX-1

ML6428CSX-1

更新时间： 2024-12-02 09:15:15

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		光电二极管
页数	文件大小	规格书
13页	203K
描述
Continuous Time Filter, 1 Func, Butterworth, Lowpass, PDSO8, SOIC-8

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ML6428CSX-1 数据手册

www.fairchildsemi.com

ML6428

S-Video Filter and 75Ω Line Drivers with Summed

Composite Output

Features

General Description

• 6.7MHz Y and C ﬁlters, with CV out for NTSC or PAL

• 75Ω cable line driver for Y, C, CV, and TV modulator

• 43dB stopband attenuation at 27MHz

• 1dB ﬂatness up to 4.8MHz

The ML6428 is a dual Y/C 4th-order Butterworth lowpass

video ﬁlter optimized for minimum overshoot and ﬂat group

delay. The device also contains a summing circuit to gener-

ate ﬁltered composite video.

• No external frequency select components or clocks

• 12ns group delay ﬂatness up to 10MHz

• 5% overshoot on any input edge

• AC coupled input and output (ML6428CS-1)

• AC coupled input and DC coupled output

(ML6428CS-2)

TheY and C input signals from DACs are AC coupled into

the ML6428. Both channels have DC restore circuitry to

clamp the DC input levels during video sync. The Y channel

uses a sync tip clamp. The CV and the C channels share a

feedback clamp.

• 0.4% differential gain on all channels, 0.4º differential

phase on all channels

• 0.7% total harmonic distortion on all channels

• 5V ±10% operation

All outputs must be AC coupled into their loads for the -1

version. The -2 version is DC coupled. All inputs (-1 and -2

versions) are AC coupled. TheY or C outputs can drive

2VP-P into a 150Ω load, while the CV output can drive

2VP-P into 75Ω. Thus the CV output is capable of driving

two independent 150Ω loads to 2VP-P.

• DC restore with low tilt

On the CV output, one of the 75Ω loads can be shorted to

ground with no loss of drive to the remaining load. The Y, C

and CV channels have a gain of 2 (6dB) with 1VP-P input

levels.

Block Diagram

VCC

VCCO

4th-ORDER

FILTER

YIN

YOUT

BUFFER

SYNC TIP CLAMP

CVOUT

TRANSCONDUCTANCE

ERROR AMP

4th-ORDER

FILTER

CIN

COUT

BUFFER

GND

REV. 1.0.1 11/7/01

12 3 4 5 6 7...13

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