MAX469C Просмотр технического описания (PDF) - Maxim Integrated

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MAX469C

Two-Channel, Triple/Quad RGB Video Switches and Buffers

Maxim Integrated 

Two-Channel, Triple/Quad

RGB Video Switches and Buffers

__________Applications Information

Higher-Order RGB + Sync

Video Multiplexing

Higher-order RGB video multiplexers can be realized

by paralleling

to V+ and use

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LE

the

one in use. Since the disabled output resistance of the

MAX463/MAX464 is 250kΩ, several devices may be

paralleled to form larger RGB video multiplexer arrays

without signal degradation. Connect series resistors at

each amplifier's output to isolate the disabled output

capacitance of each paralleled device, and use a

MAX469 or MAX470 to drive the output coaxial cables

(see Figure 7).

Paralleling MAX466s to Switch

1-of-4 RGB + Sync Signal Inputs

Figure 8 shows a 1-of-4 RGB + sync video mux/amp

circuit. The 1kΩ disabled output resistance limits the

number of paralleled MAX465/MAX466s to no more

than two. The amplifier outputs are connected after a

22Ω isolation resistor and ahead of a 50Ω back-termi-

nation resistor, which isolates the active amplifier out-

put from the capacitive load (5pF typ) presented by the

inactive output of the second MAX466. Impedance

mismatching is minimal, and the signal gain at the

cable end is near 1. This minimizes ringing in the out-

put signals. For multiplexing more than two devices,

see the section Higher Order RGB + Sync Video

Multiplexing, above.

_____________________________________________Pin Configurations (continued)

GND 1

IN1A 2

GND 3

IN2A 4

GND 5

IN3A 6

V- 7

IN0B 8

V- 9

IN1B 10

GND 11

IN2B 12

GND 13

IN3B 14

MAX464

MAX466

DIP/SO

28 IN0A

27 LE

26 EN

25 A0

24 CS

23 V-

22 OUT0

21 V-

20 OUT1

19 GND

18 V+

17 OUT2

16 V+

15 OUT3

TOP VIEW

IN0 1

GND 2

IN1 3

V- 4

V- 5

IN2 6

GND 7

GND 8

16 OUT0

15 GND

14 OUT1

13 V-

12 V-

11 OUT2

10 V+

9 GND

DIP/SO

MAX467

MAX469

TRIPLE (RGB)

BUFFERS

IN0 1

GND 2

IN1 3

V- 4

V- 5

IN2 6

GND 7

IN3 8

16 OUT0

15 GND

14 OUT1

13 V-

12 V-

11 OUT2

10 V+

9 OUT3

DIP/SO

MAX468

MAX470

QUAD

BUFFERS

______________________________________________________________________________________ 15

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