COMPRO X800 - START UP GUIDE Especificaciones descargar pdf (Pagina 30)

30 _____________________________________________________________________________________

MAX9249

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

Table 11. Suggested Connectors and Cables for GMSL

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 differential impedance when brought

close together—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 MAX9249 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 protec-

tion. All pins are tested for the Human Body Model. The

Human Body Model discharge components are C

100pF and R

= 1.5kI (Figure 25). The IEC 61000-4-2

discharge components are C

= 150pF and R

= 330I

(Figure 26). The ISO 10605 discharge components are

= 330pF and R

= 2kI (Figure 27).

Figure 25. Human Body Model ESD Test Circuit

Figure 26. IEC 61000-4-2 Contact Discharge ESD Test Circuit

Figure 27. ISO 10605 Contact Discharge ESD Test Circuit

STORAGE

CAPACITOR

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

1MI

1.5kI

100pF

150pF

STORAGE

CAPACITOR

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

330I

STORAGE

CAPACITOR

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

2kI

330pF

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

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