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RClamp0514M
PROTECTION PRODUCTS
Applications Information
The HDMI Compliance Test Specification (CTS) requires
sink (receiver) ports maintain a differential impedance
of 100 Ohms +/- 15%. The measurement is taken
using a Time Domain Reflectometry (TDR) method that
utilizes a pulse with a risetime <= 200ps.
ESD protection devices have an inherent junction
capacitance. Even a small amount of added capaci-
tance on an HDMI port will cause the impedance of
B
PRELIMINARY
the differential pair to drop. As such, some form of
compensation to the layout will be required to bring
the differential pairs back within the required 100
Ohm +/- 15% range. The higher the added capaci-
tance, the more extreme the modifications will need to
be. If the added capacitance is too high, compensa-
tion may not even be possible. The RClamp0514M
presents <1pF capacitance between the pairs while
A
C
being rated to handle >8kV ESD contact discharges
(>15kV air discharge) as outlined in IEC 61000-4-2.
As such, it is possible to make minor adjustments to
the board layout parameters to compensate for the
X-axis
Y-axis
A
1.640
99.3
B
1.796
105.3
C
1.953
98.7
(nsec)
(Ohm)
added capacitance of the RClamp0514M. Figure 7
shows how to implement the RClamp0514M in an
HDMI application (transmitter and receiver). Figure 8
shows impedance test results using a Semtech evalua-
tion board with layout compensation. As shown, the
device meets the HDMI CTS impedance requirements.
1
1
Figure 8 - TDR Measurement using Semtech
Evaluation Board
1
1
Figure 7 - HDMI Schematic
? 2005 Semtech Corp.
8
www.semtech.com
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