Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

______________________________________________________________________________________

11

The MAX4567 has two V+ and two V- pins. Make DC

connections to only one of each to minimize crosstalk.

Do not route DC current into one of the V+ or V- pins

and out the other V+ or V- pin to other devices. The

second set of V+ and V- pins is for AC bypassing only.

For dual-supply operation, the MAX4567 should have

four 10nF bypass capacitors connected to each V+

and V- pin as close to the package as possible. For sin-

gle-supply operation, the MAX4567 should have two

10nF bypass capacitors connected (one to each V+

pin) as close to the package as possible.

On the MAX4565, GND5 and GND6 should always be

connected to the ground plane with solid copper to

improve isolation and crosstalk.

Signal Routing

Keep all signal leads as short as possible. Separate all

signal leads from each other and other traces with the

ground plane on both sides of the board. Where possible,

use coaxial cable instead of printed circuit board traces.

Board Layout

IC sockets degrade high-frequency performance and

should not be used if signal bandwidth exceeds 5MHz.

Surface-mount parts, having shorter internal lead

frames, provide the best high-frequency performance.

Keep all bypass capacitors close to the device, and

separate all signal leads with ground planes. Such

grounds tend to be wedge-shaped as they get closer to

the device. Use vias to connect the ground planes on

each side of the board, and place the vias in the apex of

the wedge-shaped grounds that separate signal leads.

Logic-level signal lead placement is not critical.

MAX4565

GND6

COM1

COM2

COM3

COM4

GND1

NO1

NO2

NO3

NO4

50/75

Ω

OUT/IN

50/75

Ω

OUT/IN

GND5

V-

V-

10nF

V+

V+

10nF

GND2

GND3

GND4

IN1

IN1

IN2

IN2

IN3

IN3

IN4

IN4

MAX4565

MAX4565

MAX4565

1

OUT

2

3

4

1

2

3

4

1

OUT

TO

ADDITIONAL

MUXES

2

3

4

5

6

7

8

1

OUT

2

3

4

ADDRESS

DECODING

Figure 2. 4-Channel Multiplexer