MAX3814_0709 [MAXIM]
DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver; DVI / HDMI TMDS FR -4和电缆均衡器/驱动器
| 型号： | MAX3814_0709 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver |
| 文件： | 总13页 (文件大小：335K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0813; Rev 1; 9/07
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
MAX3814
General Description
Features
♦ Equalizes FR-4 Board Microstrip and Cable HF
Losses Up to 15dB at 825MHz for Operation at
0.25Gbps to 1.65Gbps
®
The MAX3814 TMDS EQ/driver IC compensates for
FR-4 and cable losses up to the DVI™/HDMI™ transmit
connector and provides a fully compliant DVI/HDMI
TMDS output. The device can also be used in DVI/HDMI
cable applications to extend reach and improve jitter
margin of cable channels at the receive-side connector.
♦ Compatible with HDMI 1.3
♦ Less Than 0.2UI
Residual Jitter at 1.65Gbps for
P-P
The on-chip TMDS drivers operate at a standard cur-
rent level for implementing a typical DVI/HDMI non-
back-terminated transmitter, as well as a 50% higher
current mode for using a 200Ω back termination resis-
tor (nonmatching) to achieve a 10dB return loss.
Typical DVI/HDMI output drivers contribute to reflection
problems between the connector and a typical high-
impedance (open) DVI/HDMI Tx output. The selectable
output current (LEVEL pin) gives the option of partial
back termination (e.g., differentially connected 200Ω) to
mitigate the reflection problem effectively while keeping
common-mode offset to a minimum.
0 to 15dB Channel Loss at 825MHz
♦ Input Terminations: 50Ω (Each Side to V ) 10ꢀ
CC
♦ Output of Driver is a Fully DVI/HDMI TMDS-
Compatible Cable Driver
♦ Output Amplitude: 1.05V
Differential
P-P
♦ Enable Pin to Select Normal Operation or Power-
Down Mode
♦ LEVEL Pin to Select Output Current for Use With
or Without Back Termination
The 4-channel implementation treats all channels identi-
cally. To allow board layout flexibility for DVI and HDMI
connectors, which have different channel order, the
clock and data channels can be arbitrarily assigned.
♦ 32-Pin TQFP for Four Channels; Any Channel Can
Be Either a TMDS Data or Clock Signal
♦ V
= 3.3V; Signal Pins Have Absolute Max
CC
Ratings of 5.5V (for Fault Conditions)
The MAX3814 operates from a 3.3V power supply,
standard for DVI/HDMI applications, and is packaged
in a 5mm x 5mm x 0.1mm, 32-pin TQFP package.
Ordering Information
PIN-
PACKAGE
PKG
CODE
PART
TEMP RANGE
Applications
MAX3814CHJ+
0°C to +70°C
32 TQFP
H32+1
Laptop PC TMDS Equalizer and Driver
Docking Station TMDS Equalizer and Driver
Cable TMDS Equalizer
+Denotes a lead-free package.
Pin Configuration appears at end of data sheet.
Simplified Functional Diagram
TERMINATED TO V
CC
IND+/-
INC+/-
OUTD+/-
OUTC+/-
OUTB+/-
OUTA+/-
4
3
4
4
INB+/-
INA+/-
2
3
3
LIMITING
AMPLIFIER
DRIVER 1
LEVEL
EQUALIZER
2
2
1
1
ENABLE
MAX3814
OUTPUT LEVEL CONTROL
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.
________________________________________________________________ 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 TMDS FR-4 and
Cable Equalizer/Driver
ABSOLUTE MAXIMUM RATINGS
TerminationꢄSupply Voltaꢁe Ranꢁe.......................ꢄ0.5V to +4.0V
Siꢁnal Voltaꢁe Ranꢁe on Any One Siꢁnal Wire ....ꢄ0.5V to +4.0V
CML CommonꢄMode Voltaꢁe Ranꢁe on
Any IꢀO Pair (sustained) .....................................ꢄ0.5V to +5.5V
CML CommonꢄMode Voltaꢁe Ranꢁe on Any IꢀO Pair
CML Output Loadinꢁ (termination)............................0Ω to Open
Operatinꢁ Amꢃient Temperature Ranꢁe ................0°C to +70°C
Storaꢁe Amꢃient Temperature Ranꢁe...............ꢄ40°C to +±50°C
ESD Human Body Model, Any Pin .....................................2000V
(sustained, within V
and 6ND)......ꢄ3.3V to 3.3V, Differential
CC
Stresses ꢃeyond those listed under “Aꢃsolute Maximum Ratinꢁs” may cause permanent damaꢁe to the device. These are stress ratinꢁs only, and functional
operation of the device at these or any other conditions ꢃeyond those indicated in the operational sections of the specifications is not implied. Exposure to
aꢃsolute maximum ratinꢁ conditions for extended periods may affect device reliaꢃility.
MAX3814
SPECIFICATION TABLES
(Typical values measured at V
= 3.3V, T = +25°C; external terminations = 50Ω ±±1; minꢀmax values valid over V
= 3.3V
CC
CC
A
±0.3V, T = 0°C to +70°C; with external terminations = 50Ω ±±1 to voltaꢁe = 3.3V ±0.7V. Tested at ±.ꢂ56ꢃps. AC parameters ꢁuarꢄ
A
anteed ꢃy desiꢁn and characterization.)
OPERATING CONDITIONS
PARAMETER
Supply Voltage
SYMBOL
CONDITIONS
MIN
3.0
0
TYP
3.3
25
MAX
3.6
UNITS
V
V
CC
Operating Ambient Temperature
Data Rate
85
°C
0.25
1.65
Gbps
At 825MHz, FR-4 microstrip compensate
on curve
Maximum Channel Loss
15
dB
ps
20% to 80%, measured at source
transmitter (input to channel)
Source Output Rise/Fall Time
Differential Input-Voltage Swing
240
Measured at source transmitter (input to
channel)
700
1050
50
1400
mV
mV
P-P
P-P
Maximum Supply Noise
Tolerance
DC-5000kHz, all specifications maintained
POWER SUPPLY
PARAMETER
DC PARAMETERS
Supply Current
CONDITIONS
MIN
MIN
TYP
MAX
UNITS
110
140
mA
TMDS EQUALIZER PERFORMANCE
PARAMETER
CONDITIONS
TYP
MAX
UNITS
Residual Output Jitter (15 x
Subtract source jitter for DJ, 0 to 15dB FR4 loss at
825MHz (Note 1)
RJ
+ DJ) from 0.25Gbps to
0.2
UI
RMS
P-P
1.65Gbps
2
_______________________________________________________________________________________
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
MAX3814
SPECIFICATION TABLES (continued)
(Typical values measured at V
= 3.3V, T = +25°C; external terminations = 50Ω ±±1; minꢀmax values valid over V
= 3.3V
CC
CC
A
±0.3V, T = 0°C to +70°C; with external terminations = 50Ω ±±1 to voltaꢁe = 3.3V ±0.7V. Tested at ±.ꢂ56ꢃps. AC parameters ꢁuarꢄ
A
anteed ꢃy desiꢁn and characterization.)
CML INPUTS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DC PARAMETERS
V
400
ꢄ
V
±00
+
CC
CC
CommonꢄMode Input Voltaꢁe
Input Termination Voltaꢁe
mV
V
ꢄ
V
+
CC
±0
CC
±0
When disconnected from source
mV
SinꢁleꢄEnded Input Termination
AC PARAMETERS
With 50Ω load, each side to V
45
50
±4
55
Ω
CC
Differential Input Return Loss
< ±.ꢂ6Hz
dB
CML OUTPUTS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DC PARAMETERS
With 50Ω load, each side to V
LEVEL = low
;
;
CC
900
900
±050
±050
±200
±200
Differential OutputꢄVoltaꢁe Swinꢁ
mV
PꢄP
With 50Ω load, each side to V
CC
LEVEL = hiꢁh; 200Ω ꢃack termination
SinꢁleꢄEnded Hiꢁh Output
Voltaꢁe
V
ꢄ
V
+
CC
±0
CC
±0
LEVEL = low
mV
SinꢁleꢄEnded Low Output
Voltaꢁe
V
ꢂ00
ꢄ
ꢄ
V
400
ꢄ
CC
CC
LEVEL = low
mV
mV
Output Voltaꢁe When ENABLE
Disaꢃled
V
V
+
CC
±0
CC
±0
LEVEL = low, ENABLE = hiꢁh
AC PARAMETERS
201 to 801; with 50Ω load,
Output, RiseꢀFall Time
80
±70
230
ps
each side to V
CC
_______________________________________________________________________________________
3
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
SPECIFICATION TABLES (continued)
(Typical values measured at V
= 3.3V, T = +25°C; external terminations = 50Ω ±±1; minꢀmax values valid over V
= 3.3V
CC
CC
A
±0.3V, T = 0°C to +70°C; with external terminations = 50Ω ±±1 to voltaꢁe = 3.3V ±0.7V. Tested at ±.ꢂ56ꢃps. AC parameters ꢁuarꢄ
A
anteed ꢃy desiꢁn and characterization.)
LVTTL/LVCMOS AND OPEN-COLLECTOR LVTTL
PARAMETER
DC PARAMETERS
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3814
LVTTL Input High Voltage
LVTTL Input Low Voltage
LVTTL Input High Current
LVTTL Input Low Current
2.0
V
V
0.8
-100
-100
+100
+100
μA
μA
Note 1: The specified FRꢄ4 loss is from ±2ꢄmil traces, 7ꢄmil spacinꢁ, and ꢂꢄmil depth (Prepreꢁ) with no solder mask. The test pattern
7
7 ꢄ
is a 2 ꢄ ±, 20 zeros, inverted 2 ±, and 20 ones.
Typical Operating Characteristics
(V = +3.3V, T = +25°C, unless otherwise noted. Residual jitter is measured directly from the eye diaꢁram histoꢁram after 5000 hits.)
CC
A
MAX3814 OUTPUT: EYE DIAGRAM OF MAX3814
POWER-SUPPLY CURRENT
vs. TEMPERATURE
MAX3814 INPUT: EYE DIAGRAM OF
EQUALIZING 1.65Gbps DATA AFTER 80in OF FR-4
1.65Gbps DATA AFTER 80in OF FR-4
MAX3814 toc03
MAX3814 toc02
150
LEVEL = HIGH
100
50
0
LEVEL = LOW
0
10
20
30
40
50
60
70
100ps/div
100ps/div
TEMPERATURE (°C)
4
_______________________________________________________________________________________
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
MAX3814
Typical Operating Characteristics (continued)
(V = +3.3V, T = +25°C, unless otherwise noted. Residual jitter is measured directly from the eye diaꢁram histoꢁram after 5000 hits.)
CC
A
MAX3814 OUTPUT: 250Mbps DATA AFTER
MAX3814 OUTPUT: 2.25Gbps DATA AFTER
MAX3814 OUTPUT: 1.65Gbps DATA AFTER
30ft OF TENSOLITE 28 AWG CABLE
33ft OF 24 AWG SPECTRA STRIP CABLE
30ft OF TENSOLITE 28 AWG CABLE
MAX3814 toc06
MAX3814 toc04
MAX3814 toc05
100ps/div
100ps/div
74ps/div
SINGLE-ENDED/DIFFERENTIAL INPUT
RETURN LOSS (S11/SDD11)
DETERMINISTIC JITTER vs.
LENGTH OF FR-4 BOARD
DETERMINISTIC JITTER vs.
LENGTH OF 24 AWG CABLE
0
250
200
150
100
50
50
40
30
20
10
0
(INPUT SIGNAL LEVEL = 0dBm)
(OUTPUT DISABLED)
(SOURCE SIGNAL LEVEL = 700mV /1200mV
P-P
DATA RATE = 0.825Gbps AND 1.65Gbps,
LOSS = 0.209dB/in AT 820MHz)
,
P-P
2.25Gbps
-5
SDD11
700mV
P-P
-10
-15
-20
-25
-30
1.65Gbps
1.65Gbps
1200mV
P-P
700mV
P-P
S11
825Mbps
(SOURCE SIGNAL LEVEL = 700mV
DATA RATE = 1.65Gbps AND 2.25Gbps,
CABLE LOSS = 0.261dB/ft AT 1.12GHz)
,
P-P
0
0
1000
2000
3000
0
10 20 30 40 50 60 70 80 90 100
LENGTH OF FR-4 (in)
0
5
10 15 20 25 30 35 40
LENGTH OF 24 AWG CABLE (ft)
FREQUENCY (MHz)
DETERMINISTIC JITTER
FOR 28 AWG TWIN AX CABLE
RESIDUAL JITTER DUE TO POWER-SUPPLY
SINUSOIDAL NOISE
RESIDUAL JITTER
150
100
50
200
150
100
50
100
80
60
40
20
0
(SOURCE SIGNAL LEVEL = 300mV TO 1800mV
DATA RATE = 1.65Gbps, 60in OF FR-4 BOARD,
FR-4 LOSS = 12.61dB AT 820MHz)
,
(SOURCE SIGNAL LEVEL = 700mV /1200mV
P-P
DATA RATE = 1.65Gbps,
LOSS = 0.358dB/ft AT 820MHz)
,
P-P
P-P
P-P
50mV NOISE
NO NOISE
V
= 700mV
20
IN
P-P
(SOURCE SIGNAL LEVEL = 700mV
NOISE SIGNAL LEVEL = 50mV
,
P-P
,
P-P
V
= 1200mV
P-P
IN
DATA RATE = 1.65Gbps, 60in FR-4)
0.1 10 100
NOISE FREQUENCY (MHz)
0
0
300
700
1100
1500
)
0
10
30
40
50
0.001
0.01
1
INPUT SIGNAL LEVEL (mV
LENGTH OF TWIN AX CABLE (ft)
P-P
_______________________________________________________________________________________
5
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
Pin Description
PIN
NAME
N.C.
FUNCTION
1, 8, 17, 24
No Connection. Not internally connected.
Positive TMDS Input, CML
2
INB+
INB-
3
Negative TMDS Input, CML
4, 5, 9, 32
V
Power Supply. All pins must be connected to V
Positive TMDS Input, CML
.
CC
CC
6
INC+
INC-
MAX3814
7
Negative TMDS Input, CML
10
11
12
IND+
Positive TMDS Input, CML
IND-
Negative TMDS Input, CML
ENABLE
Active-Low Enable Input, LVTTL. High to disable, outputs off. Low to enable, outputs on.
13, 16, 20, 21,
25 ,28
V
Negative Power Supply (Ground)
EE
14
15
18
19
22
23
26
27
OUTD-
OUTD+
OUTC-
OUTC+
OUTB-
OUTB+
OUTA-
OUTA+
Negative TMDS Output, CML
Positive TMDS Output, CML
Negative TMDS Output, CML
Positive TMDS Output, CML
Negative TMDS Output, CML
Positive TMDS Output, CML
Negative TMDS Output, CML
Positive TMDS Output, CML
Output Current Level Control, LVTTL. Low for 10mA output currents. High for 15mA currents.
Used for 200ꢀ back differential termination resistors.
29
LEVEL
30
31
INA+
INA-
Positive TMDS Input, CML
Negative TMDS Input, CML
6
_______________________________________________________________________________________
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
MAX3814
As a driver the MAX38±4 provides CML outputs. The
CML output is normally open (i.e., no ꢃack termination)
and is DCꢄcoupled ꢃy transmission line to a termination
at the far end per DVIꢀHDMI standards. The MAX38±4
provides nominally ±0mA outputꢄswitchinꢁ currents.
However, with the MAX38±4, there is a selectaꢃle hiꢁher
current drive to accommodate a differential 200Ω ꢃack
termination resistor while maintaininꢁ the differential
Detailed Description
The MAX38±4 TMDS equalizerꢀdriver accepts differential
CML input data rates from 250Mꢃps to ±.ꢂ56ꢃps. It conꢄ
sists of four differential CML input ꢃuffers, four indepenꢄ
dent fixed equalizers, four limitinꢁ amplifiers, and four
differential CML output ꢃuffers (Fiꢁure ±). The MAX38±4
functions ꢃoth as an equalizer and as a driver.
As an equalizer the MAX38±4 automatically adjusts for
attenuation levels up to ±ꢂdB at 825MHz from either
dielectric ꢃoard losses or skinꢄeffect losses in copper
caꢃle.
swinꢁ of ±000mV . This 200Ω ꢃack termination resistor
PꢄP
serves to dampen siꢁnal reflections returninꢁ to the
device from discontinuities in the channel such as DVI or
HDMI connectors, providinꢁ a ±0dB return loss. See the
CML Inputs and Outputs section for more information.
TERMINATED
TO V
CC
LIMITING
AMPLIFIER
OUTA+/-
INA+/-
EQUALIZER
DRIVER
TERMINATED
TO V
CC
LIMITING
AMPLIFIER
EQUALIZER
EQUALIZER
DRIVER
DRIVER
OUTB+/-
OUTC+/-
INB+/-
INC+/-
TERMINATED
TO V
CC
LIMITING
AMPLIFIER
TERMINATED
TO V
CC
LIMITING
AMPLIFIER
EQUALIZER
DRIVER
OUTD+/-
ENABLE
IND+/-
MAX3814
LEVEL
OUTPUT LEVEL CONTROL
Fiꢁure ±. Functional Diaꢁram
_______________________________________________________________________________________
7
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
that is subsequently pulled up by a 50Ω resistor of the
next stage, as shown in Figure 4. The ESD structure per-
mits signals to achieve 5.5V absolute maximum ratings,
high common-mode range, and compatibility to HDMI
testing. The back termination resistor should be placed
as close as possible to the MAX3814 in the layout.
CML Inputs and Outputs
The input buffers and the output drivers are current-
mode logic (CML). See Figures 2, 3, and 4.
The input buffers consist of a 50Ω load resistor connected
to V and the input connected to a differential equalizer.
CC
The output drivers are open-collector. The current in
these outputs can be adjusted to 10mA or 15mA with
the control pin LEVEL. For 10mA operation, each open-
collector output drives through a transmission line to a
50Ω pullup of the next stage, as shown in Figure 3. For
recommended 15mA operation, the two outputs are
bridged by an external 200Ω back termination resistor
The ESD protection for both the input and output cir-
cuitry consists of diodes connected to a transient volt-
age suppressor clamp shown as a Schottky diode in
Figures 2, 3, and 4. For more information about the
function of the suppressor clamp, refer to the Detailed
Description section of the MAX3208E data sheet
(www.maxim-ic.com/MAX3208E).
MAX3814
V
T
V
CC
TRANSIENT
SUPRESSOR
CLAMP
50Ω
50Ω
TRANSIENT
SUPRESSOR
CLAMP
50Ω
OUT_+
OUT_-
IN_+
+
-
EQUALIZER
V
CC
TRANSIENT
SUPRESSOR
CLAMP
50Ω
LEVEL = LOW
ENABLE = HIGH
IN_-
10mA
5mA
Figure 2. Simplified Input Circuit
Figure 3. Simplified Output Circuit Without Back Termination
Resistor
8
_______________________________________________________________________________________
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
MAX3814
V
T
V
CC
50Ω
50Ω
TRANSIENT
SUPRESSOR
CLAMP
OUT_+
OUT_-
44kΩ
200Ω
LEVEL,
ENABLE
INPUTS
BACK TERMINATION
44kΩ
88kΩ
50kΩ
TRANSIENT
SUPRESSOR
CLAMP
LEVEL = LOW
ENABLE = HIGH
10mA
5mA
Figure 4. Simplified Output Circuit with Back Termination
Resistor
Figure 5. Simplified Input Circuitry for Output Level (LEVEL)
and Enable (ENABLE) Control
Output Enable Control
The ENABLE pin is an LVTTL input that allows the user
to shut off the output-collector currents, thereby reduc-
ing power consumption of the device. Forcing this pin
high turns the output currents off; forcing this pin low
(normal operation) turns the currents on.
Applications Information
Figure 6a shows a typical TMDS channel from a graph-
ics board of a laptop computer to a remote display.
Maintaining a 100Ω differential impedance for this
channel has its challenges. Besides proper board lay-
out of traces, there are multiple reflection points (A to
H). For example, at interface F in Figure 6a, a circular
arrow shows a reflection at the connector of a remote
display. When these reflections hit another interface,
they reflect again and thus become echoes corrupting
the incident signal. In Figure 6b, the MAX3814 is used
to equalize losses, isolate reflections, and redrive the
transmission line with high fidelity.
Figure 5 shows a simplified circuit for both the output
and enable controls.
_______________________________________________________________________________________
9
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
tion, the 200Ω resistor at the output of the MAX38±4
aꢃsorꢃs reflections in this case from the DVI or the
HDMI connector.
Laptop PC TMDS Equalizer and Driver
As shown at location XX in Fiꢁure ꢂꢃ, the MAX38±4
equalizes trace losses and redrives the TMDS outputs
at the dockinꢁ connector. The 200Ω resistor at the outꢄ
put of the MAX38±4 aꢃsorꢃs reflections from the dockꢄ
inꢁ connector.
An optional 2dB to ꢂdB attenuator pad can ꢃe used to
aꢃsorꢃ reflections ꢃetween internal interface connecꢄ
tions. If used, the attenuator pad must ꢃe a matched Pi
or T attenuator network. The resultinꢁ flat throuꢁh loss
can ꢃe made ꢃy the excellent input sensitivity of the
MAX38±4 as shown in the Typical Application Circuits.
The MAX38±4’s excellent input sensitivity allows the
attenuated siꢁnal to ꢃe restored.
Dock or Port Expander
The MAX38±4 can also ꢃe used on the dock or port
expander as it equalizes loss, isolates the connector,
and redrives TMDS output siꢁnals at location YY as
shown in Fiꢁure ꢂꢃ. Similarly, with the previous applicaꢄ
MAX3814
LAPTOP
DOCK
REMOTE DISPLAY
EXTERNAL DVI/HDMI
CABLE
GRAPHICS
BOARD
50Ω
3.3V
ASIC
ASIC
50Ω
3.3V
INTERNAL
CONNECTOR
OR FLEX
DVI/HDMI
CONNECTOR
DVI/HDMI
CONNECTOR
MXM
CONNECTOR
DOCKING
CONNECTOR
A
B
C
D
E
F
G
H
REFLECTION
INTERFACES
LAPTOP
DOCK
REMOTE DISPLAY
XX
YY
ZZ
EXTERNAL DVI/HDMI
CABLE
MAX3814
MAX3814
MAX3814
GRAPHICS
BOARD
50Ω
3.3V
50Ω
3.3V
50Ω
3.3V
50Ω
3.3V
ASIC
200Ω
200Ω
200Ω
PAD
ASIC
50Ω
50Ω
50Ω
50Ω
3.3V
3.3V
3.3V
3.3V
INTERNAL
CONNECTOR
OR FLEX
DVI/HDMI
CONNECTOR CONNECTOR
DVI/HDMI
MXM
CONNECTOR
DOCKING
CONNECTOR
Fiꢁure ꢂa (top). Schematic Showinꢁ the TMDS Siꢁnal Channel from the Laptop 6raphics Boards to the Remote Display. Possiꢃle
Reflection Interfaces are Laꢃeled A to H.
Fiꢁure ꢂꢃ (ꢃottom). Schematic Showinꢁ the Same Channel, with possiꢃle location of the MAX38±4 to Equalize Losses, to Aꢃsorꢃ
Reflections, and to Redrive the Transmission Line.
10 ______________________________________________________________________________________
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
MAX3814
• The 4ꢄchannel implementation treats all channels
identically. Input and output data channel desiꢁnaꢄ
tions are only a ꢁuide. Polarity assiꢁnments can ꢃe
swapped and channel paths can ꢃe interchanꢁed.
Cable TMDS Equalizer
The MAX38±4 is useful in providinꢁ equalization for
caꢃles losses at location ZZ, at the input DVIꢀHDMI
connector of the remote display. It can equalize caꢃle
lenꢁths of ±5 meters of 2ꢂ AW6 wire and ±2 meters of
28 AW6 wire. Aꢁain, the 200Ω resistor placed at the
output of the MAX38±4 aꢃsorꢃs reflections from the
imperfect termination of the ASIC or imperfect transmisꢄ
sionꢄline interconnect.
• An uninterrupted ꢁround plane should ꢃe posiꢄ
tioned ꢃeneath the hiꢁhꢄspeed IꢀOs.
• 6roundꢄpath vias should ꢃe placed close to the
IC and the inputꢀoutput interfaces to allow a return
current path to the IC and the DVI and HDMI
inputs.
Layout Considerations
The TMDS CML inputs are the most critical paths for
the MAX38±4 and ꢁreat care should ꢃe taken to miniꢄ
mize discontinuities on these transmission lines
ꢃetween the connector and the IC. Here are some suꢁꢄ
ꢁestions for maximizinꢁ the performance of the
MAX38±4.
• Maintain a ±00Ω differential transmission line
impedance into and out of the MAX38±4.
• To minimize possiꢃle reflections, choose the
200Ω ꢃack termination option. Place this resistor
as close to the MAX38±4 as possiꢃle.
• Use ꢁood hiꢁhꢄfrequency layout techniques and
multilayer ꢃoards with an uninterrupted ꢁround
plane to minimize EMI and crosstalk. Refer to the
schematic and ꢃoard layers of the MAX38±4EVKIT.
• The data and clock inputs should ꢃe wired directꢄ
ly ꢃetween the caꢃle connector and IC without
stuꢃs.
Typical Application Circuits
LAPTOP
DOCK
REMOTE DISPLAY
EXTERNAL DVI/HDMI
CABLE
MAX3814
MAX3814
MAX3814
GRAPHICS
BOARD
CMOS
ROUTING
SWITCH
50Ω
3.3V
50Ω
3.3V
50Ω
3.3V
50Ω
3.3V
ASIC
200Ω
200Ω
200Ω
ASIC
50Ω
50Ω
50Ω
50Ω
3.3V
3.3V
3.3V
3.3V
DVI/HDMI
CONNECTOR CONNECTOR
DVI/HDMI
MXM
CONNECTOR
DOCKING
CONNECTOR
______________________________________________________________________________________ 11
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
Typical Application Circuits (continued)
DVI-D OR HDMI
EXTENDER BOX
UP TO 60m
DVI-D OR
HDMI CABLE
STANDARD
LENGTH DVI-D
OR HDMI CABLE
MAX3816
DDC EXTENDER
MAX3814
HDTV
MAX3815
MAX3814
EQUALIZER
DRIVER/EQUALIZER
VIDEO SOURCE
DIGITAL BROADCAST
DIGITAL CABLE
DIGITAL SATELLITE
DVD
Blu-ray™ DISC
HD-DVD
Blu-ray is a trademark of Blu-ray Disc Association.
3.3V 10%
V
CC
V
LEVEL
CC
V
CC
3.3V 10%
3.3V
50Ω
50Ω
100Ω
50Ω
50Ω
MAX3814
CONTROLLED IMPEDANCE
TRANSMISSION LINE OR CABLE
0.1μF
0.1μF
0.1μF
EQ/DRIVER
(1 OF 4)
Z (DIFFERENTIAL) = 100Ω
0.1μF
Z (DIFFERENTIAL) = 100Ω
Rx
CONTROLLED IMPEDANCE
AC-COUPLING APPLICATION:
(NOT FOR A DC-COUPLED
DVI/HDMI TMDS LINK)
TRANSMISSION LINE OR CABLE
100Ω
V
CC
3.3V 10%
3.3V
GND
ENABLE
12 ______________________________________________________________________________________
DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
MAX3814
Chip Information
Pin Configuration
PROCESS: SiGe Bipolar
TOP VIEW
24 23 22 21 20 19 18 17
Package Information
For the latest package outline information, go to
www.maxim-ic.com/packages.
16
15
V
25
V
EE
EE
OUTD+
OUTA- 26
PACKAGE TYPE
DOCUMENT NO.
21-0110
14 OUTD-
27
28
29
30
31
32
OUTA+
32 TQFP
V
13
12
EE
V
EE
MAX3814
LEVEL
INA+
INA-
ENABLE
11 IND-
10 IND+
Revision History
9
V
CC
V
CC
Pages changed at Rev 1: 1–4, 13, and 14, 15 (removed)
+
1
2
3
4
5
6
7
8
TQFP
(5mm × 5mm × 1.0mm)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim 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 ____________________ 13
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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