Texas Instruments LMK00105 Ultra-low Jitter LVCMOS Fanout Buffer/Level Translator with Universal Input LMK00105BEVAL/NOP LMK00105BEVAL/NOPB Datenbogen
Produktcode
LMK00105BEVAL/NOPB
V
OH
V
OL
GND
V
OD
= | V
OH
- V
OL
|
V
SS
= 2
·
V
OD
V
OD
Definition
V
SS
Definition for Output
Non-Inverting Clock
Inverting Clock
V
OD
V
SS
V
OS
V
IH
V
IL
GND
V
ID
= | V
IH
±
V
IL
|
V
SS
= 2
·
V
ID
V
ID
Definition
V
SS
Definition for Input
Non-Inverting Clock
Inverting Clock
V
ID
V
SS
V
CM
SNAS579F – MARCH 2012 – REVISED MAY 2013
MEASUREMENT DEFINITIONS
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.
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
inverting and non-inverting signal. The symbol for this first measurement is typically V
inverting and non-inverting signal. The symbol for this first measurement is typically V
ID
or V
OD
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 non-inverting signal
with respect to the inverting signal. The symbol for this second measurement is V
with respect to the inverting signal. The symbol for this second measurement is V
SS
and is a calculated
parameter. Nowhere in the IC does this signal exist with respect to ground, it only exists in reference to its
differential pair. V
differential pair. V
SS
can be measured directly by oscilloscopes with floating references, otherwise this value can
be calculated as twice the value of V
OD
as described in the first section
illustrates the two different definitions side-by-side for inputs and
illustrates the two different
definitions side-by-side for outputs. The V
ID
and V
OD
definitions show V
A
and V
B
DC levels that the non-inverting
and inverting signals toggle between with respect to ground. V
SS
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 non-inverting reference. Thus the peak-to-peak voltage of the
differential signal can be measured.
increasing and decreasing above and below the non-inverting reference. Thus the peak-to-peak voltage of the
differential signal can be measured.
V
ID
and V
OD
are often defined in volts (V) and V
SS
is often defined as volts peak-to-peak (V
PP
).
Figure 6. Two Different Definitions for Differential Input Signals
Figure 7. Two Different Definitions for Differential Output Signals
Copyright © 2012–2013, Texas Instruments Incorporated
7
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