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EMIF01-10018W5 Datasheet(PDF) 6 Page - STMicroelectronics |
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EMIF01-10018W5 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 10 page Fig. A7: Crosstalk phenomena line 2 line 1 α β α β + + 2 1 VG1 VG2 RG1 RG2 RL1 RL2 DRIVERS RECEIVERS 12 21 VG1 VG2 VG2 VG1 CROSSTALK BEHAVIOR 1- Crosstalk phenomena 2- Digital Crosstalk Fig. A8: Digital crosstalk measurement Line 1 Line 2 VG1 β21 VG1 +5V +5V 74HC04 +5V Square Pulse Generator 5KHz 74HC04 EMIF01 10018W5 Fig. A9: Digital crosstalk results VG1 β21VG1 The crosstalk phenomena are due to the coupling between 2 lines. The coupling factor ( β12 or β21 ) increases when the gap across lines decreases, particularly in silicon dice. In the example above the expected signal on load RL2 is α2VG2, in fact the real voltage at this point has got an extra value β21VG1. This part of the VG1 signal represents the effect of the crosstalk phenomenon of the line 1 on the line 2. This phenomenon has to be taken into account when the drivers impose fast digital data or high frequency analog signals in the disturbing line. The perturbed line will be more affected if it works with low voltage signal or high load impedance (few k Ω). The following chapters give the value of both digital and analog crosstalk. Figure A8 shows the measurement circuit used to quantify the crosstalk effect in a classical digital application. Figure A9 shows that in such a condition signal from 0 to 5V and rise time of few ns, the impact on the disturbed line is less than 50mV peak to peak. No data disturbance was noted on the concerned line.The measurements performed with falling edges gives an impact within the same range. EMIF01-10018W5 6/10 |
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