Datasheet

MAX4999
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.
V
CC
V
OUT
V
IN
GND
V+
V
IN
V
OUT
MEAS.
NETWORK
ANALYZER
50Ω 50Ω
50Ω
OFF-ISOLATION = 20log
ON-LOSS = 20log
CROSSTALK = 20log
50Ω
REF.
C1
V
OUT
V
IN
V
OUT
V
IN
C0
CHANNEL
SELECT
EN
HIGH
D_ _ _
COM_
0.1µF
MAX4999
C2
Figure 3. Off-Isolation, On-Loss, and Crosstalk