FMS6414 查看數據表（PDF） - Fairchild Semiconductor

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FMS6414

Dual Channel Video Drivers with Integrated Filters

Fairchild Semiconductor 

FMS6414

PRODUCT SPECIFICATION

Functional Description

Introduction

The FMS6414 is a monolithic continuous time video filter

designed for reconstructing the luminance, chrominance,

or composite video signals from D/A source. The chip is

intended for use in applications with AC coupled input and

AC coupled outputs. (See Figure 1) The reconstruction filters

approximate a 4th-order Butterworth characteristic with an

optimization toward low over-shoot and flat group delay.

The video outputs are each capable of driving 2VP-P into an

AC coupled 150Ω video load, with up to 35pF of load

capacitance at the output pin. The channel is clamped during

sync to establish the appropriate output voltage swing range.

Thus the input coupling capacitors do not behave according

to the conventional RC time constant. Clamping for all

channels settles to less than 10mv within 5ms of a change in

video input source. In most applications the input coupling

capacitors are 0.1µF. The input typically sinks 1µA during

active video, which nominally tilts a horizontal line by about

2mV at the Video output. During sync, the clamp typically

sources 20µA to restore the DC level. The net result is that

the average input current is zero. Any change in the input

coupling capacitor’s value will inversely alter the amount of

tilt per line. Such a change will also linearly affect the clamp

response time. This product is robust and stable under all

stated load and input conditions. Capacitive bypassing VCC

directly to ground ensures this performance.

Video I/O

The video inputs are driven by either a low impedance

source of 1VP-P or the output of a 75Ω terminated line.

The input is required to be AC coupled via a 0.1µF coupling

capacitor which allows for a settling time of 5ms. The video

output is capable of driving an AC coupled 150Ω load at

2VP-P, or 1VP-P into a 75Ω load. Up to 35pF of load

capacitance (at the output pin) can be driven without stability

or slew issues. The output is AC coupled with a 220µF or

larger AC coupling capacitor.

Typical Applications Diagram

YIN

0.1µF

1 YIN

SYNC STRIP,

REF, AND TIMING

x2

YOUT 8

220µF 75Ω

2

NC (Reserved)

gM

1V

3

GND_VIDEO

FMS6414

7

VCC_VIDEO

0.1µF

6

NC (Reserved)

Video Cable

YOUT

75Ω

+5.0V

1µF

CIN

0.1µF

4 CIN

gM

1V

220µF 75Ω

COUT 5

x2

Video Cable

COUT

75Ω

Figure 1.

REV. 1.0.1 6/27/02

3

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