IP4788CZ32 datasheet(25/33 Pages) NXP

Part #	IP4788CZ32

Description	DVI and HDMI interface ESD and overcurrent protection, DDC/CEC buffering, hot plug detect and backdrive protection

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Manufacturer	NXP [NXP Semiconductors]

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IP4788CZ32

All information provided in this document is subject to legal disclaimers.

IP4788CZ32

Rev. 2 — 24 November 2014

25 of 33

NXP Semiconductors

IP4788CZ32

DVI and HDMI interface ESD and overcurrent protection

9.11 Typical application

The IP4788CZ32 is designed to simplify routing to the HDMI connector and to ease the

incorporation of high-level ESD protection into delicately balanced high-speed

TMDS lines. These lines rely on tightly controlled microstrip or stripline transmission lines

with minimal impedance discontinuities. They can deteriorate return loss, increase

deterministic jitter and generally erode overall link signal integrity.

Normally when designing the PCB with standard shunt ESD clamps, careful consideration

must be given to manual pre-compensation of the additional load of the added

ESD component. With the IP4788CZ32 TLCs, the ESD suppressor is designed to

maintain the characteristic impedance of the PCB microstrip or stripline. Therefore the

designer needs only to be concerned with the standard-controlled impedance of the

unloaded PCB lines. This feature simplifies the task of the PCB designer, and minimizes

the tuning cycles, which are sometimes required when pre-compensation misses the

mark. A basic application diagram for the ESD protection of an HDMI interface is shown in

Figure 24 for a type-A HDMI connector.

The optimized DFN5050-32 pinning simplifies the PCB design to keep the ESD protection

close to the connector where it can minimize the coupling of the ESD pulse onto other

lines in the system during a strike.

Due to the integrated pull-up and pull-down resistors, only two external capacitors are

required to implement a fully compliant HDMI port.

Fig 24. Application of the IP4788CZ32 showing optimized single-layer HDMI type-A

connector routing

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