ml6428 Fairchild Semiconductor, ml6428 Datasheet

ml6428

Manufacturer Part Number

ml6428

Description

S-video Filter And 75 ?line Drivers With Summed Composite Output

Manufacturer

Fairchild Semiconductor

Datasheet

1.ML6428.pdf (10 pages)

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Features

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

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

• 43dB stopband attenuation at 27MHz

• 1dB ﬂatness up to 4.8MHz

• 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

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

• 0.7% total harmonic distortion on all channels

• 5V ±10% operation

• DC restore with low tilt

Block Diagram

ML6428

S-Video Filter and 75

Composite Output

(ML6428CS-2)

phase on all channels

YIN

CIN

SYNC TIP CLAMP

TRANSCONDUCTANCE

ERROR AMP

4th-ORDER

FILTER

VCC

Line Drivers with Summed

GND

VCCO

General Description

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.

The Y 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.

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

version. The -2 version must be DC coupled. All inputs (-1

and -2 versions) are AC coupled. The Y or C outputs can

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

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

two independent 150 loads to 2VP-P.

On the CV output, one of the 75 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.

BUFFER

www.fairchildsemi.com

YOUT

CVOUT

COUT

REV. 1B April 2003

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