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AND8090D Datasheet(PDF) 6 Page - ON Semiconductor |
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AND8090D Datasheet(HTML) 6 Page - ON Semiconductor |
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6 / 20 page  AND8090/D http://onsemi.com 6 Output Swing − The output swing (VOUTpp) is measured between the HIGH and LOW levels of each individual differential or single−ended output. The output voltage swing for each individual output is defined by the following equation and Figure 8. VOUTPP + VOH * VOL VOUTpp VOH VOL 50% Figure 8. Output Voltage Swing The VOUTpp 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 (PWH and PWL respectively) are equal for a 50% duty cycle signal. PWH HIGH LOW 50% PWL Fifty Percent Duty Cycle: PWH = PWL 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 (fMAX). For shift registers, it is referred to as the Maximum Shift Frequency (fSHIFT). It is the frequency where the output voltage swing (VOUTpp) 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) 1 2 3 4 5 6 7 8 (JITTER) 9 |
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