19-0798; Rev 0; 4/07
KIT
ATION
EVALU
ABLE
AVAIL
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
The MAX3845 is a TMDS® 2-to-4 fanout switch and
cable driver for multimonitor distribution of DVI™ or
HDMI™ signaling up to 1.65Gbps. Both inputs and outputs are standard TMDS signaling as per DVI and HDMI
standards. Because TMDS links are “point-to-point,”
buffering is required for fanout applications.
Features
o Two DVI/HDMI TMDS-Compatible Inputs and Four
DVI/HDMI TMDS-Compatible Outputs
o Save Power by Turning Off Unused Outputs
o Each Output Independently Selects Input 1 or
Input 2
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).
o Three Preemphasis Settings Extend Cable Reach
Up to 7m
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.
o TMDS Data (x3) and Clock (x1) Can Be Arbitrarily
Assigned to the Four Identical Switched Paths (A,
B, C, and D)
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.
Ordering Information
o Operation Up to 1.65Gbps
o 14mm x 14mm, 100-Pin TQFP Package with
Exposed Paddle for Heat Sinking
o 3.3V Power Supply
PART
TEMP RANGE PIN-PACKAGE
MAX3845UCQ+
-10°C to +85°C 100 TQFP-EP
PKG
CODE
C100E-3
+Denotes a lead-free package.
EP = Exposed pad.
Applications
Typical Operating Circuit
Digital Signage and Industrial Display
2:4 FANOUT/SWITCH APPLICATION
PC Monitor Distribution
Home A/V Receivers
DVI/HDMI Distribution Amplifiers
DVI/HDMI Crosspoint Switches
CONTROL
SIGNALS
VIDEO SOURCE 1
VIDEO SOURCE 2
IN_SEL[1:4]
PREEMPH[1:4]
OUTPUT TO DISPLAY 1
MAX3845
2:4 DVI/HDMI TMDS
FANOUT SWITCH AND
CABLE DRIVER
OUTPUT TO DISPLAY 2
OUTPUT TO DISPLAY 3
OUTPUT TO DISPLAY 4
Pin Configuration appears at end of data sheet.
HOTPLUG[1:4]
TMDS is a registered trademark of Silicon Image, Inc.
DVI is a trademark of Digital Display Working Group.
BUFFER
2:4 CMOS
SWITCH x5 DDC DATA, DDC CLK,
HOTPLUG, 5V, GND, (CEC)
HDMI is a trademark of HDMI Licensing, LLC.
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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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MAX3845
General Description
