MAX9268 datasheet(29/35 Pages) MAXIM

29 / 35 page

Gigabit Multimedia Serial Link Deserializer

with LVDS System Interface

______________________________________________________________________________________ 29

Board Layout

Separate the digital signals and CML/LVDS high-speed

signals to prevent crosstalk. Use a four-layer PCB with

separate layers for power, ground, CML/LVDS, and digital

signals. Layout PCB traces close to each other for a 100I

differential characteristic impedance. The trace dimensions

depend on the type of trace used (microstrip or stripline).

Note that two 50I PCB traces do not have 100I differen-

tial impedance when brought close together because the

impedance goes down when the traces are brought closer.

Route the PCB traces for a CML/LVDS channel (there

are two conductors per CML/LVDS channel) in parallel to

maintain the differential characteristic impedance. Avoid

vias. Keep PCB traces that make up a differential pair equal

length to avoid skew within the differential pair.

ESD Protection

The MAX9268 ESD tolerance is rated for Human Body

Model, IEC 61000-4-2, and ISO 10605. The ISO 10605

and IEC 61000-4-2 standards specify ESD tolerance for

electronic systems. CML/LVDS I/O are tested for ISO 10605

ESD protection and IEC 61000-4-2 ESD protection. All

pins are tested for the Human Body Model. The Human

Body Model discharge components are CS = 100pF and

RD = 1.5kI (Figure 24). The IEC 61000-4-2 discharge

components are CS = 150pF and RD = 330I (Figure 25).

The ISO 10605 discharge components are CS = 330pF and

RD = 2kI (Figure 26).

Table 11. Suggested Connectors and

Cables for GMSL

Figure 24. Human Body Model ESD Test Circuit

Figure 26. ISO 10605 Contact Discharge ESD Test Circuit

Figure 25. IEC 61000-4-2 Contact Discharge ESD Test Circuit

VENDOR

CONNECTOR

CABLE

JAE Electronics, Inc.

MX38-FF

A-BW-Lxxxxx

Nissei Electric Co., Ltd.

GT11L-2S

F-2WME

AWG28

Rosenberger

Hochfrequenztechnik GmbH

D4S10A-40ML5-Z Dacar 538

STORAGE

CAPACITOR

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

1MI

1.5kI

100pF

STORAGE

CAPACITOR

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

2kI

330pF

150pF

STORAGE

CAPACITOR

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

330I

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