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Maxim Integrated Products - DVI/HDMI 2:4 TMDS Fanout Switch and Cable Driver

Numéro de référence MAX3845
Description DVI/HDMI 2:4 TMDS Fanout Switch and Cable Driver
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products 





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MAX3845 fiche technique
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19-0798; Rev 0; 4/07
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
General Description
The MAX3845 is a TMDS® 2-to-4 fanout switch and
cable driver for multimonitor distribution of DVIor
HDMIsignaling up to 1.65Gbps. Both inputs and out-
puts are standard TMDS signaling as per DVI and HDMI
standards. Because TMDS links are “point-to-point,”
buffering is required for fanout applications.
Four DVI/HDMI TMDS outputs are provided for fanout
distribution. Each TMDS output can be independently
sourced from either input or can be turned off. Each
TMDS input or output is composed of four differential
channels that can be arbitrarily assigned to the three
data signals and the 1/10th-rate clock. The data rate
depends on resolution, but it can vary from 250Mbps
(VGA) to 1.65Gbps (UXGA or 1080p/60).
Typical applications include multiroom display of the
same video source or industrial/commercial signage
applications such as airport monitors or trading room
floor displays. The MAX3845 includes selectable output
preemphasis that extends output cable reach up to an
additional 7m.
For DDC switching, use the companion MAX4814E* 2:4
low-resistance CMOS crosspoint switch. DDC switching
is not required for applications that connect DDC to one
reference monitor only.
The MAX3845 can be configured to create a 2 x 8 or
4 x 4 switch (see the Typical Operating Circuit diagrams).
The MAX3845 is available in a 14mm × 14mm, 100-pin
TQFP-EP package and operates over the -10°C to
+85°C temperature range.
Applications
Digital Signage and Industrial Display
PC Monitor Distribution
Home A/V Receivers
DVI/HDMI Distribution Amplifiers
DVI/HDMI Crosspoint Switches
Features
Two DVI/HDMI TMDS-Compatible Inputs and Four
DVI/HDMI TMDS-Compatible Outputs
Save Power by Turning Off Unused Outputs
Each Output Independently Selects Input 1 or
Input 2
Three Preemphasis Settings Extend Cable Reach
Up to 7m
Operation Up to 1.65Gbps
14mm x 14mm, 100-Pin TQFP Package with
Exposed Paddle for Heat Sinking
3.3V Power Supply
TMDS Data (x3) and Clock (x1) Can Be Arbitrarily
Assigned to the Four Identical Switched Paths (A,
B, C, and D)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX3845UCQ+ -10°C to +85°C 100 TQFP-EP C100E-3
+Denotes a lead-free package.
EP = Exposed pad.
Typical Operating Circuit
2:4 FANOUT/SWITCH APPLICATION
CONTROL
SIGNALS
IN_SEL[1:4]
PREEMPH[1:4]
OUTPUT TO DISPLAY 1
VIDEO SOURCE 1
MAX3845
OUTPUT TO DISPLAY 2
Pin Configuration appears at end of data sheet.
VIDEO SOURCE 2
2:4 DVI/HDMI TMDS
FANOUT SWITCH AND
CABLE DRIVER
HOTPLUG[1:4]
OUTPUT TO DISPLAY 3
OUTPUT TO DISPLAY 4
TMDS is a registered trademark of Silicon Image, Inc.
DVI is a trademark of Digital Display Working Group.
HDMI is a trademark of HDMI Licensing, LCC.
*Future product—contact factory for availability.
2:4 CMOS
SWITCH x5
BUFFER
DDC DATA, DDC CLK,
HOTPLUG, 5V, GND, (CEC)
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

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