MAX3845UCQ+D [MAXIM]
Consumer Circuit, 14 X 14 MM, 1.00 MM HEIGHT, LEAD FREE, MS-026, TQFP-100;
| 型号： | MAX3845UCQ+D |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Consumer Circuit, 14 X 14 MM, 1.00 MM HEIGHT, LEAD FREE, MS-026, TQFP-100 商用集成电路 |
| 文件： | 总19页 (文件大小：561K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0798; Rev 0; 4/07
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
General Description
Features
®
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.
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
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
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.
Ordering Information
PKG
PART
TEMP RANGE PIN-PACKAGE
CODE
The MAX3845 can be configured to create a 2 x 8 or
4 x 4 switch (see the Typical Operating Circuit diagrams).
MAX3845UCQ+ -10°C to +85°C 100 TQFP-EP
C100E-3
+Denotes a lead-free package.
EP = Exposed pad.
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
Typical Operating Circuit
Digital Signage and Industrial Display
2:4 FANOUT/SWITCH APPLICATION
PC Monitor Distribution
CONTROL
SIGNALS
IN_SEL[1:4]
Home A/V Receivers
PREEMPH[1:4]
OUTPUT TO DISPLAY 1
OUTPUT TO DISPLAY 2
OUTPUT TO DISPLAY 3
OUTPUT TO DISPLAY 4
DVI/HDMI Distribution Amplifiers
DVI/HDMI Crosspoint Switches
VIDEO SOURCE 1
VIDEO SOURCE 2
MAX3845
2:4 DVI/HDMI TMDS
FANOUT SWITCH AND
CABLE DRIVER
Pin Configuration appears at end of data sheet.
HOTPLUG[1:4]
BUFFER
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, LLC.
2:4 CMOS
SWITCH x5
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.
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
ABSOLUTE MAXIMUM RATINGS
Dupply Voltage Range (V ) ................................-0.3V to +5.5V
Voltage Between Any Output CꢁL I/O
CC
Voltage Range at HOTPLUGx Pins ......................-0.3V to +6.0V
Voltage Range at LVTTL, LVCꢁOD, I/O Pins .......-0.3V to +5.5V
Voltage Range at CꢁL Output Pins ......................-0.3V to +5.5V
Voltage Range at CꢁL Input Pins
(CꢁL short to GNM duration < 1s)....................-0.3V to +4.0V
Voltage Between Any Input CꢁL I/O
Complementary Pair....................................................... 3.6V
Continuous Power Missipation (T = +70°C)
A
100-Pin TQFP-EP (derate 45.5mW/°C
above +70°C) ............................................................3636mW
Operating Junction Temperature .....................-55°C to +150°C
Dtorage Temperature Range ............................-55°C to +150°C
Mie Attach Temperature ..................................................+400°C
Lead Temperature (soldering, 10s) .................................+300°C
Complementary Pair ...................................................... 3.3V
Voltage Range at LODꢁUTE_EN ..........................-0.3V to +5.5V
MAX3845
Dtresses beyond those listed under “Absolute ꢁaximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
= 3.0V to +3.6V, T = -10°C to +85°C. Typical values are at V
= +3.3V, external terminations = 50Ω 1ꢀ, TꢁMD rate =
CC
CC
A
250ꢁbps to 1.65Gbps, T = +25°C, unless otherwise noted.) (Note 1)
A
PARAMETER
Power-Supply Current
Supply-Noise Tolerance
SYMBOL
CONDITIONS
MIN
TYP
454
50
MAX
UNITS
PREEMPH[1:4] = high, OUT_LEVEL = high,
current into V pins, 1200mV
CC
I
626
mA
CC
= V
IN
P-P
DC to 500kHz
mV
P-P
SKIN-EFFECT EQUALIZER PEAKING
Fixed Rx Equalizer
Compensation
Gain at 825MHz
1
dB
PREEMPHx pin = low
PREEMPHx pin = open
PREEMPHx pin = high
0
3
6
Settable Tx Preemphasis
JITTER PERFORMANCE
0dB cable loss, no
preemphasis
0.04
0.05
0.07
0.07
0.08
0.12
0.12
0.12
0.2
200ꢀ back
3dB cable loss, +3dB
preemphasis
termination
Residual Deterministic Jitter
(Measured at end of cable
having ideal skin-effect loss
and connectors, e.g., Gore Twin
Coax, Amphenol Skewclear
Twinax, with SMA connectors)
(Note 2)
6dB cable loss, +6dB
preemphasis
UI
0dB cable loss, no
preemphasis
No back
3dB cable loss, +3dB
preemphasis
0.2
termination
6dB cable loss, +6dB
preemphasis
0.10
1.5
0.2
2
Residual Random Jitter (Note 3)
Measured with source T /T = 250ps
ps
RMS
r
f
CML INPUTS (SOURCE SIDE)
Differential-Input Voltage Swing
Common-Mode Input Voltage
Input Voltage When Disconnected
V
At cable input
400
2000
mV
P-P
ID
V
CM
V
- 1000
V
CC
CC
mV
V
- 10
V
+ 10
CC
CC
2
_______________________________________________________________________________________
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
ELECTRICAL CHARACTERISTICS (continued)
CC
(V
= 3.0V to +3.6V, T = -10°C to +85°C. Typical values are at V
250ꢁbps to 1.65Gbps, T = +25°C, unless otherwise noted.) (Note 1)
= +3.3V, external terminations = 50Ω 1ꢀ, TꢁMD rate =
CC
A
A
PARAMETER
Input Resistance
SYMBOL
CONDITIONS
MIN
TYP
50
MAX
UNITS
ꢀ
R
Single-ended
45
55
IN
Input LOS/Mute Threshold
Differential peak-peak
Deassert mute
150
1.2
0.6
19
mV
Input LOS/Mute Response Time
μs
Assert mute
Input Return Loss
Differential, ꢁ 1.6GHz
dB
CML OUTPUTS (CABLE SIDE)
No preemphasis, no back termination,
OUT_LEVEL = low
900
825
1050
925
1200
1050
Differential-Output Voltage Swing
V
V
mV
P-P
OD
No preemphasis, 200ꢀ back termination,
OUT_LEVEL = high
Output-Voltage High
Single-ended, no back termination
V
V
- 10
V
V
+ 10
OH
CC
CC
CC
CC
mV
Output Voltage During Power-
Down
Single-ended, PWRDWN_x = low or
V
- 10
+ 10
OFF
V
CC
= 0V
Rise/Fall Time
Intrapair Skew
20% to 80% (T = 0°C to +85°C)
75
90
12
140
A
40
ps
V
Worst case among A, B, C, and D of an
output
Interpair Skew
35
60
CONTROL INTERFACE
LVTTL Input High Voltage
V
2.0
IH
All except IN_SELx pins
IN_SELx pins
1.0
0.8
100
LVTTL Input Low Voltage
LVTTL Input High Current
V
IL
V
< V < V
IN
IH(MIN)
IH(MAX)
All except
OUT_LEVEL pin
μA
V
150
LVTTL Input Low Current
V
< V < V
IN
IL(MIN)
IL(MAX)
OUT_LEVEL pin
500
5.5
1.5
HOTPLUGx Input High Voltage
HOTPLUGx Input Low Voltage
Typical input 30kꢀ to GND
V
CC
- 0.2
Note 1: AC specifications are guaranteed by design and characterization.
10
10
Note 2: Test pattern is a 2 - 1 PRBD + 20 ones + 2 - 1 PRBD (inverted) + 20 zeros.
Note 3: Test pattern is a 1111 0000 pattern at 1.65Gbps.
_______________________________________________________________________________________
3
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
Typical Operating Characteristics
10
10
(Typical values are at V
otherwise noted.)
= +3.3V, T = +25°C, data pattern = 2 - 1 PRBD + 20 ones + 2 - 1 PRBD (inverted) + 20 zeros, unless
A
CC
OUTPUT EYE DIAGRAM AT 1.65Gbps
SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
SHORT LOW-LOSS SMA CABLE
MAX3845 toc03
500
480
460
440
420
400
380
360
340
500
480
460
440
420
400
380
360
340
0dB PREEMPHASIS
200Ω BACK TERMINATION
OUT_LEVEL = LOW,
OUT_LEVEL = HIGH,
ALL INPUTS/OUTPUTS ACTIVE,
PREEMPHASIS SAME ON ALL
OUTPUT CHANNELS
ALL INPUTS/OUTPUTS ACTIVE,
PREEMPHASIS SAME ON ALL
OUTPUT CHANNELS
MAX3845
6dB PREEMPHASIS
3dB PREEMPHASIS
0dB PREEMPHASIS
6dB PREEMPHASIS
3dB PREEMPHASIS
0dB PREEMPHASIS
-10
5
20
35
50
65
80
-10
5
20
35
50
65
80
100ps/div
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
OUTPUT EYE DIAGRAM AT 2.25Gbps
OUTPUT EYE DIAGRAM AT 1.65Gbps
OUTPUT EYE DIAGRAM AT 2.25Gbps
SHORT LOW-LOSS SMA CABLE
6dB LOSS, 24AWG, 25ft TWIN-AX CABLE
6dB LOSS, 24AWG, 25ft TWIN-AX CABLE
MAX3845 toc04
MAX3845 toc05
MAX3845 toc06
0dB PREEMPHASIS
6dB PREEMPHASIS
6dB PREEMPHASIS
200Ω BACK TERMINATION
200Ω BACK TERMINATION
200Ω BACK TERMINATION
80ps/div
100ps/div
80ps/div
OUTPUT EYE DIAGRAM AT 1.65Gbps
JITTER vs. INPUT-SIDE CABLE LOSS
AT 825 MHz
JITTER vs. OUTPUT-SIDE CABLE LOSS
AT 825 MHz
THROUGH 2m DVI TO HDMI CABLE
MAX3845 toc07
160
140
120
100
80
120
100
80
60
40
20
0
6dB PREEMPHASIS
200Ω BACK TERMINATION
DATA RATE = 1.65Gbps
200Ω BACK TERMINATION
DATA RATE = 1.65Gbps
200Ω BACK TERMINATION
3dB PREEMPHASIS
0dB PREEMPHASIS
60
40
6dB PREEMPHASIS
20
0
0
2
4
6
8
0
2
4
6
8
100ps/div
CABLE LOSS (dB)
CABLE LOSS (dB)
4
_______________________________________________________________________________________
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
Typical Operating Characteristics (continued)
10
10
(Typical values are at V
otherwise noted.)
= +3.3V, T = +25°C, data pattern = 2 - 1 PRBD + 20 ones + 2 - 1 PRBD (inverted) + 20 zeros, unless
A
CC
DIFFERENTIAL-INPUT RETURN LOSS
vs. FREQUENCY
TEMP VOLTAGE
vs. JUNCTION TEMPERATURE
POWER DISSIPATION
vs. AMBIENT TEMPERATURE
0
-5
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
3000
2500
2000
1500
1000
500
ALL INPUTS/OUTPUTS ACTIVE,
PREEMPHASIS SAME ON ALL
OUTPUT CHANNELS
-10
-15
-20
-25
-30
-35
-40
6dB PREEMPHASIS
OUT_LEVEL = HIGH
0dB PREEMPHASIS
OUT_LEVEL = LOW
0
0
500 1000 1500 2000 2500 3000
FREQUENCY (MHz)
-10 10 30 50 70 90 110 130 150
-10
5
20
35
50
65
80
JUNCTION TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
Pin Description
PIN
NAME
FUNCTION
1, 4, 7, 10,
97, 100
V
Positive Power-Supply Connection. Powers input channel 1 and output channels 1 and 2.
Noninverting TMDS CML Input, Channel 1
CC1
IN1_B+,
IN1_C+,
IN1_D+,
IN1_A+
2, 5, 8, 98
IN1_B-,
IN1_C-,
IN1_D-,
IN1_A-
3, 6, 9, 99
Inverting TMDS CML Input, Channel 1
Power-Down, LVTTL/LVCMOS Input. Force high or leave open to power down input channel 1. Force
low to enable input channel 1. The MAX3845 powers down if both PWRDWN_1 and PWRDWN_2 are
forced high or left open.
11
PWRDWN_1
12
13
V
Positive Power-Supply Connection. Powers the temp-sense circuitry.
CC3
LOS MUTE Enable Input. Connect to V for typical operation. Connect to GND to disable the LOS
CC
MUTE function.
LOSMUTE_EN
TEMP
Junction Temperature Sensor. Attach a ground-referenced voltage DMM to this pin to measure the
14
15
die’s junction temperature (see the V
pin description). Leave open if not used.
CC3
Power-Down, LVTTL/LVCMOS Input. Force high or leave open to power down input channel 2. Force
low to enable input channel 2. The MAX3845 powers down if both PWRDWN_1 and PWRDWN_2 are
forced high or left open.
PWRDWN_2
16, 19, 22,
25, 26, 29
V
CC2
Positive Power-Supply Connection. Powers input channel 2 and output channels 3 and 4.
_______________________________________________________________________________________
5
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
Pin Description (continued)
PIN
NAME
FUNCTION
IN2_A+,
IN2_B+,
IN2_C+,
IN2_D+
17, 20, 23,
27
Noninverting TMDS, CML Input, Channel 2
Inverting TMDS, CML Input, Channel 2
IN2_A-,
IN2_B-,
IN2_C-,
IN2_D-
MAX3845
18, 21, 24,
28
IN_SEL4,
IN_SEL3,
IN_SEL2,
IN_SEL1
30, 61, 65,
96
Input Select, LVTTL Input. Force high to select input channel 1. Force low to select input channel 2.
Leave open to disable the output channel.
PREEMPH4,
PREEMPH3,
31, 62, 64,
95
Preemphasis Select, LVTTL/LVCMOS Input. Force high for 6dB of output preemphasis. Leave open
PREEMPH2, for 3dB of output preemphasis. Force low for 0dB of output preemphasis (normal).
PREEMPH1
HOTPLUG4, Hotplug Sense Input. Connect this pin to the display’s HOTPLUGx signal (buffered) to allow
HOTPLUG3, automatic power-down of the associated output when the display is disconnected. A low-cost quad
HOTPLUG2, 5V, noninverting CMOS gate (74ACT32 series) is recommended to buffer the MAX3845 from the
32, 46, 80,
94
HOTPLUG1 HOTPLUGx pin to match HOTPLUG level specifications. If this feature is not used, connect to V
.
CC
33, 36, 39,
42, 45, 47,
50, 51, 54,
57, 60
GND2
Supply Ground. Ground connection for input channel 2 and output channels 3 and 4.
Inverting TMDS, CML Output, Channel 4
OUT4_D-,
OUT4_C-,
OUT4_B-,
OUT4_A-
34, 37, 40,
43
OUT4_D+,
OUT4_C+,
OUT4_B+,
OUT4_A+
35, 38, 41,
44
Noninverting TMDS, CML Output, Channel 4
OUT3_D-,
OUT3_C-,
OUT3_B-,
OUT3_A-,
48, 52, 55,
58
Inverting TMDS, CML Output, Channel 3
OUT3_D+,
OUT3_C+,
OUT3_B+,
OUT3_A+,
49, 53, 56,
59
Noninverting TMDS, CML Output, Channel 3
6
_______________________________________________________________________________________
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
Pin Description (continued)
PIN
NAME
FUNCTION
Output Level Select, LVTTL/LVCMOS Input. Force pin low when no back termination is used (11mA
63
OUT_LEVEL of tail current). Force pin high when 200ꢀ back termination resistors are used (14mA of tail
current).
66, 69, 72,
75, 76, 79,
81, 84, 87,
90, 93
GND1
Supply Ground. Ground connection for input channel 1 and output channels 1 and 2.
Inverting TMDS, CML Output, Channel 2
OUT2_D-,
OUT2_C-,
OUT2_B-,
OUT2_A-
67, 70, 73,
77
OUT2_D+,
OUT2_C+,
OUT2_B+,
OUT2_A+
68, 71, 74,
78
Noninverting TMDS, CML Output, Channel 2
OUT1_D-,
OUT1_C-,
OUT1_B-,
OUT1_A-
82, 85, 88,
91
Inverting TMDS, CML Output, Channel 1
OUT1_D+,
OUT1_C+,
OUT1_B+,
OUT1_A+
83, 86, 89,
92
Noninverting TMDS, CML Output, Channel 1
Ground. The exposed pad must be soldered to the circuit board ground for proper thermal and
electrical operation.
—
EP
_______________________________________________________________________________________
7
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
Detailed Description
Applications Information
The ꢁAX3845 2:4 MVI/HMꢁI fanout switch and cable
driver accept differential CꢁL input data at rates of
250ꢁbps up to 1.65Gbps (individual channel data
rate). The input portion of the device consists of two
independent TꢁMD inputs, each having four fixed-level
equalizers, four limiting amplifiers, a loss-of-signal
(LOD) detector, and power-down control. The output
portion of the device consists of four independent
TꢁMD outputs, each having four multiplexers, four out-
put buffers with selectable preemphasis, HOTPLUG
detection, and channel selection control (Figure 1).
MAX3845 in HDMI 1.3 Systems
The ꢁAX3845 is designed and characterized to oper-
ate from 250ꢁbps to 1.65Gbps. HMꢁI 1.3 specifies up
to 2.25Gbps for 1080p “deep color” and allows a maxi-
mum data rate of 3.4Gbps on each of the three data
pairs. The ꢁAX3845 operates normally in an HMꢁI 1.3
system up to 1.65Gbps. The ꢁAX3845 operates at data
rates above 1.65Gbps with reduced jitter performance.
Dee the Typical Operating Characteristics section for
more information.
MAX3845
MAX3845 in HDCP Systems
High-bandwidth digital content protection (HMCP) is a
copy protection system employed in some MVI and
most HMꢁI interfaces. Video data is encrypted at the
transmitter and decrypted at the receiver. The data
scrambling is dependent upon shared keys established
during the authentication protocol that occurs over the
MMC channel (between the video source and the dis-
play). The ꢁAX3845 does not decrypt or reencrypt
data. Therefore, HMCP-encrypted video routed through
the ꢁAX3845 is only viewable on the display to which
the MMC channel is connected. For applications that
employ HMCP, the ꢁAX3845 acts as a dual 1:4 switch
and not as a fanout device. This means that one video
source can be selected to drive any one of four dis-
plays, but the video source cannot be replicated on
more than one display at the time. Fanout is possible in
non-HMCP applications, allowing one video source to
simultaneously drive up to four displays.
Fixed Input Equalization
All four differential pairs on the ꢁAX3845’s TꢁMD
inputs have fixed-level equalizers to compensate for 0in
to 6in of FR4 PCB losses. The signal boost is approxi-
mately 1dB at 825ꢁHz. If more equalization is desired,
use the ꢁAX3814 or ꢁAX3815 in front of the ꢁAX3845
to accommodate long cable lengths.
Limiting Amplifiers
Limiting amplifiers follow the equalizer block to ensure
proper signal levels are achieved for the multiplexers.
Loss-of-Signal (LOS) Detectors
Input channel 1 has an LOD detector attached to the
IN1_B pair. For input channel 2 the LOD detector is
attached to the IN2_C pair. If the received-signal ampli-
tude is smaller than 150mV
(typical) at IN1_B, all
P-P
output channels selected to input 1 are muted.
Likewise, if a signal smaller than 150mV (typical) is
P-P
at IN2_C, all output channels selected to input 2 are
muted.
Output Level Control, Back Termination,
and AC-Coupling
The OUT_LEVEL pin is an LVTTL input that allows the
user to select between standard output drive current
(11mA) or increased output drive current (14mA). The
increased output current setting allows back termina-
tion resistors to be used on the outputs. The use of
back terminations is highly recommended for best sig-
nal integrity (see Figures 2 and 3).
Multiplexers
Each ꢁAX3845 output has four multiplexers, one for
each signal pair contained in the TꢁMD channel. These
connect the output to either input 1 or input 2. The
IN_DELx pins control the multiplexers.
Preemphasis Drivers
The preemphasis drivers have three selectable levels
of preemphasis: 0dB, 3dB, and 6dB. The preemphasis
drivers provide a precompensated signal that allows for
extended length cables to be used at the output.
If OUT_LEVEL is set low, the standard output drive cur-
rent (11mA) is consistent with MVI/HMꢁI architecture
and common-mode levels. As per standard, no back
termination is used so no reflected energy can be
absorbed.
If OUT_LEVEL is set high, the output drive current is
increased to 14mA and allows the use of back termina-
tion resistors. Two options are available: a differential
back termination resistor or two single-ended pullup
resistors (see Figures 2 and 3).
8
_______________________________________________________________________________________
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
OUT_LEVEL
2:4 DVI FANOUT
SWITCH AND CABLE DRIVER
OUTPUT MACRO 1
DVI OR
HDMI
CONNECTOR
PE
OUT1_[A-D]
HOTPLUG1
PREEMPH1
IN_SEL1
EXAMPLE:
MAX3815
OUTPUT MACRO 2
EQ
EQ
LOS 1
LA
IN1_[A-D]
DVI OR
HDMI
CONNECTOR
PE
OUTPUT MACRO 3
PE
OUT2_[A-D]
HOTPLUG2
PREEMPH2
IN_SEL2
>MUTE
-
PWRDWN_1
PD
INPUT MACRO 1
CLKLOS
LOSMUTE_EN
EXAMPLE:
MAX3815
DVI OR
HDMI
CONNECTOR
OUT3_[A-D]
HOTPLUG3
PREEMPH3
IN_SEL3
EQ
EQ
LOS 2
LA
IN2_[A-D]
>MUTE
-
PWRDWN_2
PD
INPUT MACRO 2
CLKLOS
OUTPUT MACRO 4
DVI OR
HDMI
CONNECTOR
PE
OUT4_[A-D]
HOTPLUG4
PREEMPH4
IN_SEL4
ANALOG TEMP
SENSE
TEMP (DIE TEMP SENSE)
POWER-DOWN LOGIC FOR EACH OF 4 OUTPUT MACROS
PWRDWN_ [OUTPUT MACRO x], WHERE x = 1, 2, 3, OR 4, IF:
[PWRDWN_1 = LOW] OR [LOS 1 = HIGH]
DECODER
HIGH
AND
[IN_SELx = HIGH]
OR
[PWRDWN_2 = HIGH] OR [LOS 2 = HIGH]
ON-CHIP SIGNAL:
POWER-DOWN
OUTPUT MACRO x
IN_SELx
AND
[IN_SELx = LOW]
OR
LOW
OPEN
[IN_SELx = OPEN]
R
2 x R
[HOTPLUGx = LOW OR OPEN]
Figure 1. Functional Miagram
_______________________________________________________________________________________
9
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
+3.3V
MAX3845
50Ω
50Ω
TMDS 200Ω*
Z = 100
0(DIFF)
Rx
OUTPUT
OR
PAIR 300Ω*
MAX3845
TMDS
RECEIVER
*BACK TERMINATION RESISTOR IS LOCATED AS CLOSE AS POSSIBLE TO THE MAX3845.
Figure 2. MC-Coupled Mifferential Back Termination
+3.3V
+3.3V
MAX3845
100Ω* 100Ω*
50Ω
50Ω
0.1μF
0.1μF
TMDS
OUTPUT
PAIR
Z
= 100
Rx
0(DIFF)
TMDS
RECEIVER
*BACK TERMINATION RESISTORS ARE LOCATED AS CLOSE AS POSSIBLE TO THE MAX3845.
Figure 3. AC-Coupled Dingle-Ended Back Termination
Back termination greatly reduces signal degradation
The differential back termination options reduce the
common-mode output voltage seen by the TꢁMD
caused by reflections coming off MVI/HMꢁI connectors
and any other transmission line discontinuities. ꢁuch of
the reflected energy off a MVI connector, for example,
is absorbed by the back termination resistance rather
than reflected forward, causing eye closure. For the
cases shown in Figures 2 and 3, the return loss is
approximately 9.5dB. In other words, about 90ꢀ of the
reflected energy is absorbed by the back termination
resistors. ꢁaxim strongly recommends using back ter-
mination to maximize the ꢁAX3845’s performance.
receiver to approximately V
- 350mV (Table 1).
CC
The single-ended back termination option allows for
AC-coupling between the ꢁAX3845 and a TꢁMD
receiver, so long as the TꢁMD receiver is tolerant of an
input common-mode voltage equal to V
later).
(HMꢁI 1.2 or
CC
10 ______________________________________________________________________________________
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
Table 1. Output Levels With and Without Back Termination
VOLTAGES AT THE INPUT OF THE TMDS RECEIVER (TYPICAL)
CONDITIONS
V
V
V
V
L
DIFF
CM
H
PREEMPHx = LOW, OUT_LEVEL = LOW (Output Drive Current = 11mA)
No back termination 1100mV
PREEMPHx = LOW, OUT_LEVEL = HIGH (Output Drive Current = 14mA)
V
CC
- 275mV
V
CC
V
CC
- 550mV
P-P
Differential 200ꢀ back terminations (DC-coupled)
Differential 300ꢀ back terminations (DC-coupled)
Single-ended, 2x 100ꢀ back terminations (AC-coupled)
950mV
V
V
- 350mV
- 350mV
V
- 120mV
V
CC
V
CC
V
CC
- 585mV
- 615mV
- 240mV
P-P
CC
CC
1050mV
V
- 90mV
P-P
P-P
CC
CC
950mV
V
CC
V
CC
+ 240mV
Temperature Sense
Pin 14, TEꢁP, allows the on-die temperature to be
sensed as an analog voltage output. To sense the die
temperature, measure the MC voltage at TEꢁP. The
approximate die temperature can be determined using
the following equation:
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
V
- 0.2V, up to 5.5V, the associated output is pow-
CC
ered up.
T = (V
- 0.93) x 297
J
TEꢁP
Also see the Typical Operating Characteristics section
for more information.
Activating an Output
Deveral things must occur for an output to be active.
Table 2 lists the required inputs to enable an output.
Power-Down
The power-down inputs (PWRMWN_1 and PWRMWN_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.
Cable Selection
Good quality cable is recommended for good perfor-
mance. Meterministic jitter (MJ) can be caused by dif-
ferential-to-common-mode conversion (or vice versa)
within a twisted pair (DTP 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
IN_SELx
CONDITION
HOTPLUGx
CONDITION
PWRDWN_1
CONDITION
PWRDWN_2
CONDITION
LOS 1
CONDITION
LOS 2
CONDITION
INPUT 1
INPUT 2
HIGH
LOW
HIGH
HIGH
LOW
Don’t care
LOW
LOW
Don’t care
LOW
Don’t care
Don’t care
______________________________________________________________________________________ 11
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
Layout Considerations
Interface Models
The data inputs and outputs are the ꢁAX3845’s most
critical paths, and great care should be taken to mini-
mize discontinuities on these transmission lines
between the connector and the IC. Here are some sug-
gestions for maximizing the performance of the
ꢁAX3845:
V
V
CC
CC
MAX3845
50Ω
50Ω
• ꢁaintain 100Ω differential transmission line imped-
ance into and out of the ꢁAX3845.
TMDS
INPUT+
MAX3845
EQUALIZATION
NETWORK
• The data and clock inputs should be wired directly
between the cable connector and IC without stubs.
TMDS
INPUT-
• An uninterrupted ground plane should be posi-
tioned beneath the high-speed I/Os.
• Ground path vias should be placed close to the IC
and the input/output interfaces to allow a return cur-
rent path to the IC and the MVI/HMꢁI cable.
Figure 4. Dimplified Input Circuit Dchematic
• Use good high-frequency layout techniques and
multilayer boards with an uninterrupted ground
plane to minimize EꢁI and crosstalk.
For more information, refer to the schematic and board
layers of the ꢁaxim evaluation kit, ꢁAX3845EVKIT.
MAX3845
TMDS
Exposed-Pad Package and Thermal
Considerations
OUTPUT+
TMDS
OUTPUT-
The exposed pad on the 100-pin TQFP-EP provides a
very low thermal resistance path for heat removal from
the IC. The pad is also electrical ground on the
ꢁAX3845 and must be soldered to the circuit board
ground for proper thermal and electrical performance.
Refer to ꢁaxim Application Note HFAN-08.1: Thermal
Considerations of QFN and Other Exposed-Paddle
Packages for additional information.
TVS*
TVS*
*TVS IS A "TRANSIENT VOLTAGE
SUPPRESSOR" CLAMP-CIRCUIT.
Because the ꢁAX3845 is a high-power device, it is
important to ensure that good heat dissipation is incor-
porated into the PCB design. The device’s temperature-
sense pin (TEꢁP) allows estimation of the junction
temperature to be made while the ꢁAX3845 is operat-
ing. This information can be used to determine if the
PCB layout is dissipating heat properly.
Figure 5. Dimplified Output Circuit Dchematic
12 ______________________________________________________________________________________
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
Pin Configuration
TOP VIEW
99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76
+
V
CC1
1
75 GND1
INT1_B+
INT1_B-
2
74 OUT2_B+
73 OUT2_B-
72 GND1
3
V
CC1
4
IN1_C+
IN1_C-
5
71 OUT2_C+
70 OUT2_C-
69 GND1
6
V
CC1
7
IN1_D+
IN1_D-
8
68 OUT2_D+
67 OUT2_D-
9
V
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
GND1
CC1
PWRDWN_1
IN_SEL2
PREEMPH2
OUT_LEVEL
PREEMPH3
IN_SEL3
GND2
V
CC3
LOSMUTE_EN
TEMP
MAX3845
PWRDWN_2
V
CC2
IN2_A+
IN2_A-
OUT3_A+
OUT3_A-
GND2
V
CC2
IN2_B+
IN2_B-
OUT3_B+
OUT3_B-
GND2
V
CC2
IN2_C+
IN2_C-
OUT3_C+
OUT3_C-
GND2
V
CC2
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
TQFP-EP*
*EXPOSED PAD MUST BE CONNECTED TO GROUND.
______________________________________________________________________________________ 13
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
Typical Operating Circuits (continued)
HDCP* APPLICATION
HDMI/DVI
CABLE
MAX3845
MOVIE
WITH HDCP
DVI/HDMI
DUAL 1:4 SWITCH
CONFIGURATION
MAX3845
HDMI/DVI
CABLE
OFF
MOVIE
WITH HDCP
HDMI/DVI
CABLE
Blu-ray™,
HD-DVD,
CABLE STB,
SATELLITE STB
HDMI/DVI
CABLE
SPORTS
SPORTS
WITH HDCP
WITH HDCP
HDMI/DVI
CABLE
Blu-ray,
HD-DVD,
CABLE STB,
SATELLITE STB
HDMI/DVI
CABLE
OFF
DRIVER SELECTS (8)
IN_SELx: HIGH = INPUT 1, OPEN = OFF, LOW = INPUT 2
PREEMPHx: HIGH = 6dB, OPEN = 3dB, LOW = 0dB
* BECAUSE THE MAX3845 IS A TRANSPARENT SWITCH, HDCP SOURCES CAN ONLY BE CONNECTED TO ONE HDCP-COMPLIANT
DISPLAY AT A TIME AND CANNOT BE FANNED OUT THROUGH THE MAX3845.
Blu-ray is a trademark of Blu-ray Disc Association.
14 ______________________________________________________________________________________
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
Typical Operating Circuits (continued)
NON-HDCP APPLICATION
HDMI/DVI
MAX3845
CABLE
VIDEO FOOTAGE
VIDEO DISPLAY
DVI/HDMI
2:4 FANOUT BUFFER
HDMI/DVI
CABLE
VIDEO FOOTAGE
VIDEO CAPTURE CARD
ON PC/MAC
PCB
TRACES
GRAPHICS ASIC
SCALING AND PICTURE
PROCESSING ENGINE
WITH TDMS OUTPUT
HDMI/DVI
CABLE
COMPUTER GRAPHICS
PCB
TRACES
VIDEO DISPLAY
EQ
COMPUTER GRAPHICS
VIDEO CARD ON PC/MAC
LONG HDMI
CABLE
MAX3815
HDMI/DVI
CABLE
DVI/HDMI
EQUALIZER
COMPUTER GRAPHICS
VIDEO DISPLAY
DRIVER SELECTS (8)
IN_SELx: HIGH = INPUT 1, OPEN = OFF, LOW = INPUT 2
PREEMPHx: HIGH = 6dB, OPEN = 3dB, LOW = 0dB
FOR APPLICATIONS THAT ARE NOT HDCP ENCODED, THE MAX3845 CAN BE USED TO FAN OUT DVI AND HDMI SIGNALS.
______________________________________________________________________________________ 15
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
Typical Operating Circuits (continued)
MAX3845
4 x 4 MATRIX APPLICATION
MAX3845
MAX3845
DVI/HDMI
2:4 FANOUT BUFFER
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
INPUT 1
INPUT 2
INPUT 3
26
50
TOP VIEW
1
1
INPUT 4
26
26
50
50
PART B
SIDE VIEW
PART A
100
76
DRIVER SELECTS 2x(8)
IN_SELx (PART A): HIGH = INPUT 2, OPEN = OFF, LOW = INPUT 4
IN_SELx (PART B): HIGH = INPUT 1, OPEN = OFF, LOW = INPUT 3
PREEMPHx: HIGH = 6dB, OPEN = 3dB, LOW = 0dB
FOR 4 x 4 MATRIX OPERATION, TWO MAX3845 PARTS ARE LOCATED ON EITHER SIDE OF THE BOARD WITH THE AXIS OF ROTATION ABOUT PINS 13 AND 63.
16 ______________________________________________________________________________________
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
Typical Operating Circuits (continued)
MAX3845
DVI/HDMI 2:4
FANOUT SWITCH
AND
CABLE DRIVER
2:8 FANOUT/SWITCH
APPLICATION
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
MAX3814
(8) MINIMUM
LOSS POWER
SPLITTERS
INPUT 1
DVI/HDMI CABLE
EQUALIZER AND DRIVER
(USE 200Ω BACK TERM)
MAX3845
DVI/HDMI 2:4
FANOUT SWITCH
AND
OUTPUT 5
OUTPUT 6
OUTPUT 7
OUTPUT 8
MAX3814
(8) MINIMUM
LOSS POWER
SPLITTERS
CABLE DRIVER
INPUT 2
DVI/HDMI CABLE
EQUALIZER AND DRIVER
(USE 200Ω BACK TERM)
50Ω MATCHED MINIMUM LOSS POWER SPLITTER:
THROUGH LOSS (ANY PORT TO ANY PORT) IS 6dB.
16Ω
16Ω
SIGNAL 1
Z = 50
SIGNAL 3
Z = 50
0
0
16Ω
SIGNAL 2
Z = 50
0
______________________________________________________________________________________ 17
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
MAX3845
PACKAGE OUTLINE, 100L TQFP
14x14x1.00mm WITH EXPOSED PAD OPTION
1
21-0116
D
2
18 ______________________________________________________________________________________
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
MAX3845
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, 100L TQFP
14x14x1.00mm WITH EXPOSED PAD OPTION
2
21-0116
D
2
ꢁaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a ꢁaxim product. No circuit patent licenses are
implied. ꢁaxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19
© 2007 ꢁaxim Integrated Products
is a registered trademark of ꢁaxim Integrated Products, Inc.
相关型号：
SI9130DB
5- and 3.3-V Step-Down Synchronous ConvertersWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1-E3
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135_11
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9136_11
Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
©2020 ICPDF网 联系我们和版权申明