IP4787CZ32 datasheet(28/36 Pages) NEXPERIA

Part #	IP4787CZ32

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

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Manufacturer	NEXPERIA [Nexperia B.V. All rights reserved]

Direct Link	https://www.nexperia.com/

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28 / 36 page

IP4787CZ32

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

IP4787CZ32

Rev. 3 — 19 December 2014

27 of 35

NXP Semiconductors

IP4787CZ32

DVI and HDMI interface ESD and overcurrent protection

9.12 Typical application

The IP4787CZ32 is designed to simplify routing to the HDMI connector, and 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, which can deteriorate return loss, increase

deterministic jitter and generally erode overall link signal integrity.

Normally, when designing a 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 IP4787CZ32 TLCs, the ESD suppressor is designed to

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

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

unloaded PCB lines. This 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 29 for a type-A HDMI connector.

The optimized HVQFN32 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 29. Application of the IP4787CZ32 showing optimized HDMI type-A connector routing

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