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PDF MAX3845 Data sheet ( Hoja de datos )
| Número de pieza | MAX3845 | |
| Descripción | DVI/HDMI 2:4 TMDS Fanout Switch and Cable Driver | |
| Fabricantes | Maxim Integrated Products | |
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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 DVI™ or
HDMI™ signaling 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.
1 page  
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
Typical Operating Characteristics (continued)
(Typical values are at VCC = +3.3V, TA = +25°C, data pattern = 210 - 1 PRBS + 20 ones + 210 - 1 PRBS (inverted) + 20 zeros, unless
otherwise noted.)
DIFFERENTIAL-INPUT RETURN LOSS
vs. FREQUENCY
0
-5
-10
-15
-20
-25
-30
-35
-40
0
500 1000 1500 2000 2500 3000
FREQUENCY (MHz)
TEMP VOLTAGE
vs. JUNCTION TEMPERATURE
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
-10 10 30 50 70 90 110 130 150
JUNCTION TEMPERATURE (°C)
POWER DISSIPATION
vs. AMBIENT TEMPERATURE
3000
ALL INPUTS/OUTPUTS ACTIVE,
PREEMPHASIS SAME ON ALL
2500 OUTPUT CHANNELS
2000
1500
1000
0dB PREEMPHASIS
500 OUT_LEVEL = LOW
6dB PREEMPHASIS
OUT_LEVEL = HIGH
0
-10
5 20 35 50 65
AMBIENT TEMPERATURE (°C)
80
Pin Description
PIN
1, 4, 7, 10,
97, 100
2, 5, 8, 98
NAME
FUNCTION
VCC1
Positive Power-Supply Connection. Powers input channel 1 and output channels 1 and 2.
IN1_B+,
IN1_C+,
IN1_D+,
IN1_A+
Noninverting TMDS CML Input, Channel 1
3, 6, 9, 99
IN1_B-,
IN1_C-,
IN1_D-,
IN1_A-
Inverting TMDS CML Input, Channel 1
Power-Down, LVTTL/LVCMOS Input. Force high or leave open to power down input channel 1. Force
11 PWRDWN_1 low to enable input channel 1. The MAX3845 powers down if both PWRDWN_1 and PWRDWN_2 are
forced high or left open.
12
VCC3
Positive Power-Supply Connection. Powers the temp-sense circuitry.
13
LOSMUTE_EN
LOS MUTE Enable Input. Connect to VCC for typical operation. Connect to GND to disable the LOS
MUTE function.
14
TEMP
Junction Temperature Sensor. Attach a ground-referenced voltage DMM to this pin to measure the
die’s junction temperature (see the VCC3 pin description). Leave open if not used.
Power-Down, LVTTL/LVCMOS Input. Force high or leave open to power down input channel 2. Force
15 PWRDWN_2 low to enable input channel 2. The MAX3845 powers down if both PWRDWN_1 and PWRDWN_2 are
forced high or left open.
16, 19, 22,
25, 26, 29
VCC2
Positive Power-Supply Connection. Powers input channel 2 and output channels 3 and 4.
_______________________________________________________________________________________ 5
5 Page 
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
Table 1. Output Levels With and Without Back Termination
CONDITIONS
VOLTAGES AT THE INPUT OF THE TMDS RECEIVER (TYPICAL)
VDIFF
VCM
VH
VL
PREEMPHx = LOW, OUT_LEVEL = LOW (Output Drive Current = 11mA)
No back termination
1100mVP-P
VCC - 275mV
VCC
VCC - 550mV
PREEMPHx = LOW, OUT_LEVEL = HIGH (Output Drive Current = 14mA)
Differential 200 back terminations (DC-coupled)
950mVP-P
VCC - 350mV VCC - 120mV VCC - 585mV
Differential 300 back terminations (DC-coupled)
1050mVP-P
VCC - 350mV
VCC - 90mV
VCC - 615mV
Single-ended, 2x 100 back terminations (AC-coupled)
950mVP-P
VCC VCC + 240mV VCC - 240mV
Temperature Sense
Pin 14, TEMP, allows the on-die temperature to be
sensed as an analog voltage output. To sense the die
temperature, measure the DC voltage at TEMP. The
approximate die temperature can be determined using
the following equation:
TJ = (VTEMP - 0.93) x 297
Also see the Typical Operating Characteristics section
for more information.
Power-Down
The power-down inputs (PWRDWN_1 and PWRDWN_2)
reduce power consumption by powering down the cho-
sen input and all outputs that are selected to that input.
For example, when output channels 1 and 4 are select-
ed to transmit input channel 2, and channel 2 is pow-
ered down, both outputs 1 and 4 are also powered
down.
Hotplug Detect
Each output channel has a HOTPLUGx detection pin
associated with it. This pin is designed to detect
whether a monitor’s hotplug connection is attached. If
HOTPLUGx is low (less than 1.5V), the associated out-
put is powered down. If HOTPLUGx is higher than
VCC - 0.2V, up to 5.5V, the associated output is pow-
ered down.
Activating an Output
Several things must occur for an output to be active.
Table 2 lists the required inputs to enable an output.
Cable Selection
Good quality cable is recommended for good perfor-
mance. Deterministic jitter (DJ) can be caused by dif-
ferential-to-common-mode conversion (or vice versa)
within a twisted pair (STP or UTP), usually a result of
cable twist or dielectric imbalance. Refer to Application
Note HFAN-4.5.4: ‘Jitter Happens’ when a Twisted Pair
is Unbalanced for more information.
Table 2. Output Enable Requirements
OUTPUT x
STATE
INPUT 1
INPUT 2
IN_SELx
CONDITION
HIGH
LOW
HOTPLUGx
CONDITION
HIGH
HIGH
PWRDWN_1
CONDITION
LOW
Don’t care
PWRDWN_2
CONDITION
Don’t care
LOW
LOS 1
CONDITION
LOW
Don’t care
LOS 2
CONDITION
Don’t care
LOW
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX3845.PDF ] | |
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