Texas Instruments TPD6F002-Q1EVM, Руководство пользователя

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Setup
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3.1.1.1 Oscilloscope Setup
Without a proper procedure, capturing ESD clamping waveforms exposes the oscilloscope to potential
voltages higher than the rating of the equipment. Proper methodology can mitigate any risk in this
operation.
Recommended equipment:
• Minimum of 1GHz bandwidth oscilloscope.
• Either of the following:
– 2 10X 50 Ω attenuators and a 0 Ω resistor (to be installed at R1).
– 1 10X 50 Ω attenuator and a 150 Ω resistor (already installed at R1).
• 50
Ω
shielded SMB cable.
Procedure
In order to protect the oscilloscope, attenuation of the measured signal is required. Here are two possible
procedures for testing U6:
1. Using two 10X attenuators:
• Install a 0
Ω
resistor in R1.
• Attach two 10X attenuators to the oscilloscope channel being used.
• Attach the 50 Ω shielded SMB cable between J5 and the attenuator.
• Set the scope attenuation factor to 100X.
• Set the oscilloscope to trigger on a positive edge for (+) ESD and a negative edge for (–) ESD
strikes. The magnitude should be set to 20 V.
• Following Section 3.1.1 , strike contact ESD to TP1.
2. Using one 10X attenuator:
• Attach one 10X attenuator to the oscilloscope.
• Attach the 50 Ω shielded SMB cable between J5 and the attenuator.
• Set the scope attenuation factor to 40X.
• Set the oscilloscope to trigger on a positive edge for (+) ESD and a negative edge for (–) ESD
strikes. The magnitude should be set to 20 V.
• Following Section 3.1.1 , strike contact ESD to TP1.
Recommended settings for the time axis is 20 ns/div and for the voltage axis is 10 V division.
The voltage levels of the ESD applied to TP1 should not exceed ± 8 kV while capturing clamping
waveforms.
3.2 U2
TPD6F002-Q1 (U2) is configured with 4 SMA (J1 – J4) connectors to allow 4-port analysis with a vector
network analyzer. Connect Port 1 to J1, Port 2 to J2, Port 3 to J3, and Port 4 to J4. This configuration
allows for the following terminology in 4 port analysis:
• S
11
: Return loss
• S
21
: Insertion loss
• S
31
: Near end cross talk
• S
41
: Far end cross talk
4 TPD6F002-Q1EVM SLVUAC7 – December 2014
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