Datasheet

Technical information USBUF
8/13 DocID7041 Rev 8
Figure 10. gives the measurement circuit for the analog crosstalk application. In Figure 11.,
the curve shows the effect of the D+ cell on the D-cell. In usual frequency range of analog
signals (up to 100 MHz) the effect on disturbed line is less than -37 db.
Figure 12. Digital crosstalk measurements configuration
Figure 12 shows the measurement circuit used to quantify the crosstalk effect in a classical
digital application.
Figure 13. Digital crosstalk results
Figure 13 shows, with a signal from 0 to 5 V and rise time of few ns, the impact on the
disturbed line is less than 250 mV peak to peak. No data disturbance was noted on the
other line.The measurements performed with falling edges gives an impact within the same
range.
Figure 10. Analog crosstalk
measurements
Figure 11. Typical analog crosstalk
results
Vg
50
Ω
50
Ω
TEST BOARD
UUx
1 10 100 1,000
-100
-80
-60
-40
-20
0
Frequency (MHz)
Analog crosstalk (dB)
D+
D-
V
G1
V
G1
+5V +5V
74HC04
+5V
Square
Pulse
Generator
74HC04
β
21
3.3 V
Rp
Ct
Rt
Ct
Rt
D1
Gnd
D2
D4
D3
3.3 V
VG1
β21 G1V