Multiplexer

With its excellent off isolation, the MAX4565 is ideal for

use in high-frequency video multiplexers. Figure 2

shows such an application for switching any one of four

video inputs to a single output. The same circuit may

be used as a demultiplexer by simply reversing the sig-

nal direction.

Stray capacitance of traces and the output capacitance

of switches placed in parallel reduces bandwidth, so the

outputs of no more than four individual switches should

be placed in parallel to maintain a high bandwidth. If

more than four mux channels are needed, the 4-channel

circuit should be duplicated and cascaded.

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

12

______________________________________________________________________________________

50%

50%

V+

0V

V+

IN_

NO_OR NC_

COM_

3V

REPEAT TEST FOR EACH SWITCH.

50

Ω

MAX4565

MAX4566

MAX4567

90%

90%

ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV).

V- IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION.

0V

+5V

10nF

GND_

V-

10nF

-5V

Figure 3. Switching Time

______________________________________________Test Circuits/Timing Diagrams