LMK04828SNKDREP datasheet(16/102 Pages) TI

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GND

VOD = | VA - VB |

VSS = 2·VOD

VOD Definition

VSS Definition for Output

Non-Inverting Clock

Inverting Clock

VOD

·VOD

GND

VID = | VA - VB |

VSS = 2·VID

VID Definition

VSS Definition for Input

Non-Inverting Clock

Inverting Clock

VID

·VID

LMK04828-EP

SNAS703 – APRIL 2017

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8.2 Differential Voltage Measurement Terminology

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

when reading data sheets or communicating with other engineers. This section addresses the measurement and

description of a differential signal so the reader can understand and distinguish 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

inverting and noninverting signal. The symbol for this first measurement is typically VID or VOD, depending on if

an input or output voltage is being described.

The second definition used to describe a differential signal is to measure the potential of the noninverting signal

with respect to the inverting signal. The symbol for this second measurement is VSS and is a calculated

parameter. This signal only exists in reference to its differential pair and does not exist in the IC with respect to

ground. VSS can be measured directly by oscilloscopes with floating references, otherwise this value can be

calculated as twice the value of VOD as described in the first description.

Figure 4 illustrates the two different definitions side-by-side for inputs and Figure 5 illustrates the two different

definitions side-by-side for outputs. The VID and VOD definitions show VA and VB DC levels that the non-inverting

and inverting signals toggle between with respect to ground. VSS input and output 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 noninverting reference. Thus, the peak-to-peak voltage of the

differential signal can be measured.

VID and VOD are often defined as volts (V) and VSS is often defined as volts peak-to-peak (VPP).

Figure 4. Two Different Definitions for

Differential Input Signals

Figure 5. Two Different Definitions for

Differential Output Signals

Refer to application note AN-912 Common Data Transmission Parameters and their Definitions for more

information.

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