USBDFxxW5

Application information

7/11

Figure 8. gives the measurement circuit for the analog crosstalk application. In Figure 10.,

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 -46 dB.

Figure 11. shows the measurement circuit used to quantify the crosstalk effect in a classical

digital application.

Figure 12. shows that in such a condition signal, from 0 to 5 V and rise time of few ns, the

impact on the other line is less than 100 mV peak to peak (below the logic high voltage

threshold). The measurements performed with falling edges give the same results.

Figure 9.

Analog crosstalk measurements

Figure 10.

Typical analog crosstalk results

50

Ω

RF IN

Vg

50

TEST BOARD

1

10

100

1,000

-100

-80

-60

-40

-20

0

frequency (MHz)

Analog crosstalk (dB)

Figure 11.

Digital crosstalk measurements

configuration

Figure 12.

Digital crosstalk results

Line 1

Line 2

+5V

+5V

74HC04

+5V

Square

Pulse

Generator

5KHz

74HC04

USBDF

xxW5