Setup
5
SLVUAN8 – April 2016
Copyright © 2016, Texas Instruments Incorporated
TPD1E04U04 Evaluation Module
3.3.1
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 Measurement Equipment:
•
One 2-GHz bandwidth (minimum of 1 GHz) oscilloscope.
•
Two 10X 50-
Ω
attenuators
•
One 50-
Ω
shielded SMA cable.
Procedure
In order to protect the oscilloscope, attenuation of the measured signal is required. Here is a procedure for
testing D3:
1. Ground the EVM using the banana connector J3.
2. Attach two 10X attenuators in series to the oscilloscope channel being used.
3. Attach the 50-
Ω
shielded SMA cable between J2 and the attenuators.
4. Set the scope attenuation factor to 100X.
5. Set the oscilloscope to trigger on a positive edge for (+) ESD and a negative edge for (–) ESD strikes.
The trigger voltage magnitude should be set to 20 V.
6. Following
, strike contact ESD to J1.Pin1.
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 J1.Pin1 should not exceed ±8 kV while capturing clamping
waveforms.
