USB 2.0 Hi-Speed Differential

8:1 Multiplexer

_______________________________________________________________________________________

5

Test Circuits/Timing Diagrams (continued)

MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS.

OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" USB_ TERMINAL ON EACH SWITCH.

ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" USB_ TERMINAL ON EACH SWITCH.

CROSSTALK IS MEASURED FROM ONE USB_ CHANNEL TO ANOTHER USB_ CHANNEL.

SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.

GND

V+

VIN

VOUT

MEAS.

NETWORK

ANALYZER

50

Ω

50

Ω

50

Ω

OFF-ISOLATION = 20log

ON-LOSS = 20log

CROSSTALK = 20log

50

Ω

REF.

C1

C0

CHANNEL

SELECT

EN

HIGH

D_ _ _

COM_

0.1

µF

MAX4999

C2

Figure 3. Off-Isolation, On-Loss, and Crosstalk