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RClamp0504M
PROTECTION PRODUCTS
Applications Information (continued)
DVI Protection
The small geometry of a typical digital-visual interface
(DVI) graphic chip will make it more susceptible to
electrostatic discharges (ESD) and cable discharge
events (CDE). Transient protection of a DVI port can be
challenging. Digital-visual interfaces can often transmit
and receive at a rate equal to or above 1Gbps. The
high-speed data transmission requires the protection
device to have low capacitance to maintain signal
integrity and low clamping voltage to reduce stress on
the protected IC. The RClamp0504M has a low typical
insertion loss of <0.4dB at 1GHz (I/O to ground) to
ensure signal integrity and can protect the DVI interface
to the 8kV contact and 15kV air ESD per IEC 61000-4-
2 and CDE.
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PRELIMINARY
Figure 7 shows how to design the RClamp0504M into the
DVI circuit on a flat panel display and a PC graphic card.
The RClamp0504M is configured to provide common
mode and differential mode protection. The internal TVS
of the RClamp0504M acts as a 5 volt reference. The
power pin of the DVI circuit does not come out through
the connector and is not subjected to external ESD
pulse; therefore, pin 3 should be left unconnected.
Connecting pin 3 to Vcc of the DVI circuit may result in
damage to the chip from ESD current.
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Figure 7 - Digital Video Interface (DVI) Protection
? 2004 Semtech Corp.
8
www.semtech.com
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