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USBDFXXW5 Datasheet(PDF) 7 Page - STMicroelectronics |
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USBDFXXW5 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 9 page USBDFxxW5 7/9 50 Ω RF IN Vg 50 Ω TG OUT TEST BOARD Fig. A8: Analog Crosstalk measurements 1 10 100 1,000 -100 -80 -60 -40 -20 0 frequency (MHz) Analog crosstalk (dB) Fig. A9: Typical Analog Crosstalk results Figure A8 gives the measurement circuit for the analog crosstalk application. In figure A9, the curve shows the effect of the D+ cell on the D- cell. In usual frequency range of analog signals (up to 100MHz) the effect on disturbed line is less than -46dB. Line 1 Line 2 VG1 b21 VG1 +5V +5V 74HC04 +5V Square Pulse Generator 5KHz 74HC04 USBDF xxW5 Fig. A10: Digital crosstalk measurements configu- ration Fig. A11: Digital crosstalk results Figure A10 shows the measurement circuit used to quantify the crosstalk effect in a classical digital appli- cation. Figure A11 shows that in such a condition signal from 0 to 5V and rise time of few ns, the impact on the other line is less than 100mV peak to peak (Below the logic high voltage threshold).The measurements performed with falling edges give the same results. |
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