MAX4928B Maxim, MAX4928B Datasheet - Page 7

• Manufacturer Part Number: MAX4928B
• Description: The MAX4928A/MAX4928B high-speed passive switches route PCI Express® (PCIe) data and/or DisplayPort™ signals between two possible destinations in desktop or laptop PCs
• Manufacturer: Maxim

Figure 2. Differential On-Loss, Differential Off-Isolation, and Differential Crosstalk
50Ω
50Ω
50Ω
50Ω
50Ω
50Ω
V
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
DIFFERENTIAL OFF-ISOLATION IS MEASURED BETWEEN IN_ AND “OFF” D_ OR TX_, X_ AND “OFF” HPD_ OR RX1_, OUT_ AND “OFF” AUX_ OR RX0_ TERMINAL ON EACH SWITCH.
DIFFERENTIAL ON-LOSS IS MEASURED BETWEEN IN_ AND “ON” D_ OR TX_, X_ AND “ON” HPD_ OR RX1_, OUT_ AND “ON” AUX_ OR RX0_ TERMINAL ON EACH SWITCH.
DIFFERENTIAL CROSSTALK IS MEASURED BETWEEN ANY TWO PAIRS.
DD
0V
DIFFERENTIAL INSERTION-LOSS/DIFFERENTIAL RETURN LOSS
LE
D_+
D_-
HPD_+
HPD_-
SEL
AUX_+
AUX_-
_______________________________________________________________________________________
DIFFERENTIAL INSERTION-LOSS = 20log
MAX4928A
MAX4928B
GND
V
+3.3V
DD
OUT_+
OUT_-
RX1_+
RX0_+
RX1_-
RX0_-
TX_+
IN_+
TX_-
0.1μF
IN_-
X_+
X_-
0V OR V
DisplayPort/PCIe Passive Switches
50Ω
50Ω
50Ω
50Ω
50Ω
50Ω
0V
DD
V
V
V
PORT 4
PORT 1
PORT 2
PORT 3
V
DIFFERENTIAL CROSSTALK
LE
IN+
IN-
OUT+
SEL
D_+/D_-
HPD_+/HPD_-
AUX_+/AUX_-
TX_+/TX_-
OUT-
RX1_+/RX1_-
HP0_+/HP0_-
(
V
DIFFERENTIAL CROSSTALK = 20log
OUT+ -
V
IN+
MAX4928A
MAX4928B
V
+3.3V
- V
GND
50Ω
50Ω
50Ω
50Ω
DD
V
NETWORK
ANALYZER
OUT-
IN-
Test Circuits/Timing Diagrams (continued)
)
OUT_+
OUT_+
OUT_-
OUT_-
0.1μF
IN_+
IN_-
IN_+
IN_-
X_+
X_+
X_-
X_-
PORT 4
PORT 1
PORT 3
V
PORT 2
V
V
V
50Ω
50Ω
50Ω
50Ω
50Ω
50Ω
IN+
IN-
OUT+
OUT-
V
(
DD
0V
V
OUT+ -
V
IN+
- V
DIFFERENTIAL OFF-ISOLATION
V
SEL
LE
D_+
D_-
HPD_+
HPD_-
AUX_+
AUX_-
OUT-
IN-
50Ω
50Ω
50Ω
50Ω
ANALYZER
NETWORK
)
DIFFERENTIAL OFF-ISOLATION = 20log
MAX4928A
MAX4928B
+3.3V
V
GND
DD
OUT_+
OUT_-
RX1_+
RX0_+
RX0_-
RX1_-
0.1μF
TX_+
TX_-
IN_+
IN_-
X_+
X_-
V
V
V
PORT 4
V
PORT 1
PORT 2
PORT 3
IN+
IN-
OUT+
OUT-
(
V
OUT+ -
V
IN+
- V
50Ω
50Ω
50Ω
50Ω
V
NETWORK
ANALYZER
OUT-
IN-
)
7