GND

Non-Inverting Clock

Inverting Clock

GND

Non-Inverting Clock

Inverting Clock

LMK00338

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SNAS636A – DECEMBER 2013 – REVISED OCTOBER 2014

7 Parameter Measurement Information

7.1 Differential Voltage Measurement Terminology

The differential voltage of a differential signal can be described by two different definitions causing confusion

when reading datasheets or communicating with other engineers. This section will address the measurement and

description of a differential signal so that the reader will be able to understand and discern between the two

different definitions when used.

The first definition used to describe a differential signal is the absolute value of the voltage potential between the

an input or output voltage is being described.

The second definition used to describe a differential signal is to measure the potential of the non-inverting signal

parameter. Nowhere in the IC does this signal exist with respect to ground; it only exists in reference to its

Figure 13 illustrates the two different definitions side-by-side for inputs and Figure 14 illustrates the two different

definitions show that if the inverting signal is considered the voltage potential reference, the non-inverting signal

voltage potential is now increasing and decreasing above and below the non-inverting reference. Thus the peak-

to-peak voltage of the differential signal can be measured.

Figure 13. Two Different Definitions for Differential Input Signals

Figure 14. Two Different Definitions for Differential Output Signals

Refer to "Common Data Transmission Parameters and their Definitions", Application Note AN-912 (SNLA036),

for more information.

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