MAX3814CHJ+ Maxim Integrated Products, MAX3814CHJ+ Datasheet - Page 10

• Manufacturer Part Number: MAX3814CHJ+
• Description: IC DRVR/EQUALIZER CABLE 32-TQFP
• Manufacturer: Maxim Integrated Products
• Type: Driverr

Specifications of MAX3814CHJ+

• Number Of Drivers/receivers: 4/0
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Protocol: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

As shown at location XX in Figure 6b, the MAX3814
equalizes trace losses and redrives the TMDS outputs
at the docking connector. The 200Ω resistor at the out-
put of the MAX3814 absorbs reflections from the dock-
ing connector.
The MAX3814 can also be used on the dock or port
expander as it equalizes loss, isolates the connector,
and redrives TMDS output signals at location YY as
shown in Figure 6b. Similarly, with the previous applica-
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
Figure 6a (top). Schematic Showing the TMDS Signal Channel from the Laptop Graphics Boards to the Remote Display. Possible
Reflection Interfaces are Labeled A to H.
Figure 6b (bottom). Schematic Showing the Same Channel, with possible location of the MAX3814 to Equalize Losses, to Absorb
Reflections, and to Redrive the Transmission Line.
10
REFLECTION
INTERFACES
______________________________________________________________________________________
GRAPHICS
GRAPHICS
Laptop PC TMDS Equalizer and Driver
BOARD
BOARD
ASIC
ASIC
A
MXM
CONNECTOR
B
MXM
CONNECTOR
LAPTOP
LAPTOP
MAX3814
C
50Ω
3.3V
50Ω
3.3V
XX
Dock or Port Expander
CONNECTOR
CONNECTOR
DOCKING
DOCKING
200Ω
D
PAD
CONNECTOR
CONNECTOR
INTERNAL
INTERNAL
OR FLEX
OR FLEX
E
DOCK
DOCK
MAX3814
50Ω
3.3V
50Ω
3.3V
YY
200Ω
tion, the 200Ω resistor at the output of the MAX3814
absorbs reflections in this case from the DVI or the
HDMI connector.
An optional 2dB to 6dB attenuator pad can be used to
absorb reflections between internal interface connec-
tions. If used, the attenuator pad must be a matched Pi
or T attenuator network. The resulting flat through loss
can be made by the excellent input sensitivity of the
MAX3814 as shown in the Typical Application Circuits .
The MAX3814’s excellent input sensitivity allows the
attenuated signal to be restored.
DVI/HDMI
CONNECTOR
DVI/HDMI
CONNECTOR
F
EXTERNAL DVI/HDMI
EXTERNAL DVI/HDMI
CABLE
CABLE
CONNECTOR
DVI/HDMI
DVI/HDMI
CONNECTOR
G
MAX3814
50Ω
3.3V
50Ω
3.3V
ZZ
REMOTE DISPLAY
REMOTE DISPLAY
200Ω
H
50Ω
3.3V
50Ω
3.3V
50Ω
3.3V
50Ω
3.3V
ASIC
ASIC