EL4332C 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL4332C

Triple 21 300 MHz Mux-Amp AV=2

Elantec -> Intersil 

EL4332C

Triple 2:1 300 MHz Mux-Amp AV =2

used, a 220Ω to 330Ω resistor to the -5.2V rail would

have the same effect.

Expanding the Multiplexer

In Figure 4, a 3:1 multiplexer circuit is shown. The

expansion to more inputs is very straight forward. Since

the EL4332C has a fixed gain of 2, interstage attenuators

may be required as shown in Figure 3. The truth table for

the 3:1 multiplexer select lines is:

X

Y

0

0

0

1

1

X

Mux Output

R3, G3, B3

R2, G2, B2

R1, G1, B1

When interstage attenuators are used, the values should

be kept down in the region of 50Ω–300Ω. This is to pre-

vent a combination of circuit board stray capacitance

and the EL4332C’s input capacitance forming a signifi-

cant pole. For example, if instead of 100Ω as shown,

resistors of 1 kΩ had been used, and assuming 3 pF of

stray and 3 pF of input capacitance, a pole would be

formed at about 53 MHz.

Figure 4. Typical Connection for a 3:1 Component Video Multiplexer

11

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