MAX96708 datasheet(64/68 Pages) MAXIM

64 / 68 page

Board Layout

Power-Supply Circuits and Bypassing

The deserializer uses an AVDD and DVDD of 1.7V to

1.9V. All inputs and outputs, except for the serial input,

derive power from an IOVDD of 1.7V to 3.6V that scales

with IOVDD. Proper voltage-supply bypassing is essential

for high-frequency circuit stability.

High-Frequency Signals

Separate the LVCMOS logic signals and CML/coax

high-speed signals to prevent crosstalk. Use a four-layer

PCB with separate layers for power, ground, CML/coax,

and LVCMOS logic signals. Layout STP PCB traces

close to each other for a 100Ω differential characteristic

impedance. The trace dimensions depend on the type

of trace used (microstrip or stripline). Note that two 50Ω

PCB traces do not have 100Ω differential impedance

when brought close together—the impedance goes down

when the traces are brought closer. Use a 50Ω trace for

the single-ended output when driving coax. Route the

PCB traces for differential CML in parallel to maintain the

differential characteristic impedance. Avoid vias. Keep

PCB traces that make up a differential pair equal in length

to avoid skew within the differential pair.

ESD Protection

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. The serial outputs are rated 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 = 1.5kΩ (Figure 25). The IEC 61000-4-2 discharge

components are CS = 150pF and RD = 330Ω (Figure 26).

The ISO 10605 discharge components are CS = 330pF

and RD = 2kΩ (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

1MΩ

1.5kΩ

100pF

150pF

STORAGE

CAPACITOR

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

330Ω

STORAGE

CAPACITOR

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

2kΩ

330pF

www.maximintegrated.com

Maxim Integrated │ 64

MAX96708

14-Bit GMSL Deserializer

with Coax or STP Cable Input

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