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AN-8006

更新时间： 2024-09-16 08:30:43

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飞兆/仙童 - FAIRCHILD		/
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Capacitor Selection for the FMS6410B S-Video Filter

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AN-8006 数据手册

December 2005

AN-8006

Capacitor Selection for the FMS6410B S-Video Filter

switching power supplies have all the necessary qualities. For a

given capacitance and voltage rating these electrolytics are

Method

The FMS6410B requires 0.1µF input coupling capacitors, but

about the same size as the tantalums. They also have low

may be AC or DC coupled out. Finding video quality — i.e., low

equivalent series resistance, low inductance, and low leakage.

ESR, equivalent series resistance, low inductance, low leakage,

Since they are intended for use as bypass capacitors in switching

and constant capacitance over a frequency range from 20Hz to

power supplies operating up to 1MHz, they have an adequate

6MHz — 0.1µF capacitors presents no problem. Surface mount

frequency response as video coupling capacitors.

capacitors meeting these requirements are both inexpensive

and plentiful.

Several types from several manufacturers have been investi-

gated. Some 220µF surface mount aluminum electrolytic capac-

itors from Cornell Dubilier, Elna, and United Chemi-Con were

indistinguishable from highquality, high-cost tantalums, as can

be seen by comparing Figures 2 and 4 with Figures 3 and 5. It

should be pointed out that these are not the only suppliers of

usable capacitors. Any physically small, surface mount, 220µF,

6V to 10V, aluminum electrolytic capacitor with ESR less than

1Ω at 6MHz and with less than 2% capacitance change from

20Hz to 6MHz is a candidate for use in FMS6410B circuits.

Many capacitors meet these requirements. With the right capacitors,

their cost is no barrier to using the FMS6410B.

The FMS6410B, when AC coupled out, also requires four

220µF output coupling capacitors if all outputs are to be used.

See Figure 1. However, some users may use values up to 1000µF

to pass “TILT” speciﬁcations in the two-ﬁeld test. In the past,

when wideband signals such as video needed coupling capacitors

in the hundreds of µF’s, tantalums were the only choice.

This presents a problem. The FMS6410B was designed for low-

cost applications. In the quantities needed, the cost of the tantalums

is greater than the cost of the ﬁlter and the other associated

components. There is a solution: modern, surface mount, aluminum

electrolytic capacitors designed for use in high-frequency

FMS6410B

Video Cables

220µF

0.1µF

75Ω

5th-Order

Filter

OUT

75Ω

220µF

75Ω

OUT

75Ω

0.1µF

75Ω

5th-Order

Filter

OUT

On-Channel

Modulator,

VCR, and TV

220µF

75Ω

OUT

75Ω

0.1µF

1µF

* C and R depend on the input impedance of load

Figure 1. AC Coupled S-Video and Composite Video Line Driver for NTSC

AN-8006 Rev. 1.0

www.fairchildsemi.com

12 3

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