USBDFxxW5
Fig. A8: Analog Crosstalk measurements
50 Ω TG OUT
Vg
TEST BOARD
RF IN
50 Ω
Fig. A9: Typical Analog Crosstalk results
Analog crosstalk (dB)
0
-20
-40
-60
-80
-100
1
10
100
frequency (MHz)
1,000
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.
Fig. A10: Digital crosstalk measurements configu-
ration
Fig. A11: Digital crosstalk results
Square
Pulse
Generator
5KHz
+5V
74HC04
Line 1
+5V
VG1
Line 2
+5V
74HC04
USBDF
xxW5
b21 VG1
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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