Rainbow-electronics MAX4885 Bedienungsanleitung PDF herunterladen (Seite 11)

MAX4885

Complete VGA 1:2 or 2:1 Multiplexer

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2:1 Multiplexer

In 2:1 mode, HSYNC and VSYNC buffers are disabled,

allowing bidirectional signaling. The DDC multiplexer

provides level shifting by clamping signals to a diode

drop less than V

(see the Typical Operating Circuit).

Connect V

to V+ to disable voltage clamping for

DDC signals.

Power-Supply Decoupling

Bypass each V+ pin and V

to ground with a 0.1µF or

larger ceramic capacitor as close to the device as pos-

sible.

PC Board Layout

High-speed switches such as the MAX4885 require

proper PC board layout for optimum performance.

Ensure that impedance-controlled PC board traces for

high-speed signals are matched in length and as short

as possible. Connect the exposed pad to a solid

ground plane.

Chip Information

PROCESS: BiCMOS

CONNECT EXPOSED PAD TO GND

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

100pF

1MΩ

1500Ω

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

Figure 5. Human Body ESD Test Model

100%

90%

36.8%

TIME

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

10%

AMPERES

Figure 6. HBM Discharge Current Waveform

1 2 ... 6 7 8 9 10 11 12 13

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