參數(shù)資料
型號(hào)： AND8090D
廠商： ON SEMICONDUCTOR
英文描述： AC Characteristics of ECL Devices
中文描述： 交流特性的ECL裝置
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 896K
代理商： AND8090D
AND8090/D
http://onsemi.com
6
Output Swing
The output swing (V
OUTpp
) is measured
between the HIGH and LOW levels of each individual
differential or singleended output. The output voltage
swing for each individual output is defined by the following
equation and Figure 8.
VOUTPP
VOH
VOL
V
OUTpp
V
OH
V
OL
50%
Figure 8. Output Voltage Swing
The V
OUTpp
value is shown as the vertical axis in the data
sheet maximum frequency plots (refer to the “Maximum
Input Frequency” section).
SIGNAL TIMING
Duty Cycle
The duty cycle is the ratio of the HIGH pulse
width (PW) to the signal period and is described by the
following equations:
Signal Period = Time between adjacent rising edges
Duty Cycle = (HIGH Pulse Width/Signal Period) * 100%
The 50% points are used to measure the HIGH pulse
width and the signal period. AC characteristics for
ON Semiconductor devices are typically measured for a
50% duty cycle input. A 50% duty cycle input/output is
shown in Figure 9. Note that the HIGH and LOW pulse
widths (PW
H
and PW
L
respectively) are equal for a 50%
duty cycle signal.
PW
H
HIGH
LOW
50%
PW
L
Fifty Percent Duty Cycle: PW
H =
PW
L
Figure 9. Input/Output Duty Cycle
Maximum Input Frequency
This is a typical device
performance value. It is the highest allowable input
frequency for proper device operation (f
MAX
). For shift
registers, it is referred to as the Maximum Shift Frequency
(f
SHIFT
). It is the frequency
where the output voltage swing
(V
OUTpp
) is equal to a minimum value that is determined by
the device type, or it is the frequency
where the device no
longer functions properly.
An output voltage swing versus input frequency plot is
typically included with data sheets. For the MC100EP90
example shown in Figure 10, the maximum listed input
frequency of 3.0 GHz occurs at an output voltage swing of
approximately 400 mV. The jitter shown in Figure 10 is
described in a later section.
0
100
200
300
400
500
600
700
800
900
0
1000
2000
3000
4000
Figure 10. Output Voltage vs. Input Frequency Example
FREQUENCY (MHz)
V
1
2
3
4
5
6
7
8
p
(JITTER)
éééééééééééééé
9
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