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SETUP
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3.3.2 Evaluation of Test Results
Connect the tested device on the EVM to a curve tracer both before and after ESD testing. After each
incremental level, if the IV curve of the ESD protection diode shifts ±0.1V, or leakage current increases by
a factor of ten, then the device is permanently damaged by ESD.
3.4 U5 & U6
Two TPD2E1B06DRL’s (U5 & U6) also have SMB (J7 & J8) connectors for capturing clamping waveforms
with an oscilloscope during an ESD strike. Caution must be taken when capturing clamping waveforms
during an ESD event so as not to damage the oscilloscope.
3.4.1 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 0 Ω resistors (already installed {R1 & R2}).
– 1 10X 50 Ω attenuator and 150 Ω resistors (to be installed at R1 & R2).
• 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 U5:
1. Using two 10X attenuators:
• Attach two 10X attenuators to the oscilloscope channel being used.
• Attach the 50 Ω shielded SMB cable between J7 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 20V.
• Following Section 3.3.1 , strike contact ESD to TP5.
2. Using one 10X attenuator:
• Install 150 Ω resistors in R1 and R2.
• Attach one 10X attenuator to the oscilloscope.
• Attach the 50 Ω shielded SMB cable between J7 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 20V.
• Following Section 3.3.1 , strike contact ESD to TP5.
Recommended settings for the time axis is 20 ns/div and for the voltage axis is 10V division.
The same procedure above can be applied to U6 by striking ESD on TP8 and connecting the 50 Ω
shielded SMB cable to J8.
The voltage levels of the ESD applied to TP5 & TP8 should not /- 8 kV while capturing clamping
waveforms.
4 TPD2E1B06DRLEVM SLVU917 – August 2013
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