19-3466; Rev 2; 2/08
KIT
ATION
EVALU
BLE
AVAILA
TMDS Digital Video Equalizer for DVI/HDMI
Cables
General Description
The MAX3815 cable equalizer automatically provides
compensation for DVI™, HDMI™, DFP, PanelLink
®
, and
ADC cables. It extends the usable cable distance up to
36 meters. The MAX3815 is designed to equalize sig-
nals encoded in the transition-minimized differential
signaling (TMDS
®
) format.
The MAX3815 features four CML-differential inputs and
outputs (three data and one clock). It provides a loss-
of-signal (LOS) output that indicates loss-of-clock sig-
nal. The outputs include a disable function or the
equalizer can be powered down to conserve power.
For direct chip-to-chip communication, the output dri-
vers can be switched to one-half the DVI output specifi-
cation to conserve power and reduce EMI. Equalization
can be automatic or set to manual control for specific
in-cable applications.
The MAX3815 is available in a 7mm x 7mm, 48-pin
TQFP-EP package and operates over a 0°C to +70°C
temperature range.
Features
♦
Extends TMDS Cable Reach to Projectors or
Monitors Using DVI, DFP, PanelLink, ADC, or
HDMI Interfaces
♦
Extends TMDS Interface Length as Follows:
0 to 50 Meters Over DVI-Cable, 24 AWG STP
(Shielded-Twisted Pair)
0 to 36 Meters Over DVI-Cable, 28 AWG STP
0 to 30 Meters Over DVI-Cable, 30 AWG STP
♦
Compatible with DTV Resolutions 480i, 480p,
720p, 1080i, and 1080p
♦
Compatible with Computer Resolutions VGA,
SVGA, XGA, SXGA, UXGA
♦
Fully Automatic Equalization Up to 40dB at
825MHz (1.65Gbps), No System Control Required
♦
3.3V Power Supply
♦
Power Dissipation of 0.6W (typ)
♦
7mm x 7mm 48-Pin TQFP Lead-Free Package
MAX3815
Applications
Front-Projector DVI/HDMI Inputs
High-Definition Televisions and Displays
DVI-D/HDMI Cable-Extender Modules and Active
Cable Assemblies
LCD Computer Monitors
Pin Configuration appears at end of data sheet.
MAX3815CCM
MAX3815CCM+
PART
Ordering Information
TEMP
RANGE
0°C to +70°C
0°C to +70°C
PIN-
PACKAGE
48 TQFP-EP*
48 TQFP-EP*
PKG
CODE
C48E-8
C48E-8
+Denotes
lead-free package.
*EP = Exposed pad.
Typical Application Circuits
VIDEO PROJECTOR
DVI-D INPUT
MAX3815
EQUALIZER
TMDS
DESERIALIZER
DVI-D CABLE UP
TO 36m OR 120ft
(28AWG STP)
Typical Application Circuits continued at end of data sheet.
DVI is a trademark of Digital Display Working Group.
HDMI is a trademark of HDMI Licensing, LLC.
PanelLink and TMDS are registered trademarks of Silicon Image, Inc.
________________________________________________________________
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.
SELECT
LAPTOP
VGA INPUT
RGB/HV
ADC/SYNC
IMAGE
SCALER AND
PROCESSOR
PANEL
INTERFACE
TIMING AND
DRIVERS
LCD,
DLP,
OR
LCOS
TMDS Digital Video Equalizer for DVI/HDMI
Cables
MAX3815
ABSOLUTE MAXIMUM RATINGS
Supply Voltage V
CC
..............................................-0.5V to +4.0V
Voltage at All I/O Pins.................................-0.5V to (V
CC
+ 0.7V)
Voltage between any CML I/O Complementary Pair ..........±3.3V
Continuous Power Dissipation (T
A
= +70°C)
48-Pin TQFP-EP (derate 36.2mW/°C above +70°C) ..2896mW
Operating Junction Temperature Range ...........-55°C to +150°C
Storage Temperature Range .............................-55°C to +150°C
Die Attach Temperature...................................................+400°C
Stresses beyond those listed under “Absolute Maximum 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
CC
= +3.0V to +3.6V, T
A
= 0°C to +70°C. Typical Values are at V
CC
= +3.3V, external terminations = 50Ω ±1%, TMDS rate =
250Mbps to 1.65Gbps, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Power-Supply Current
Supply-Noise Tolerance
EQUALIZER PERFORMANCE
Residual Output Jitter (Cables
Only) 0.25Gbps to 1.65Gbps
(Notes 1, 2, and 3)
CID Tolerance
CONTROL AND STATUS
CLKLOS
Assert Level
CML INPUTS (CABLE SIDE)
Differential Input Voltage Swing
Common-Mode Input Voltage
Input Resistance
CML OUTPUTS (ASIC SIDE)
Differential Output-Voltage Swing
Output-Voltage High
Output-Voltage Low
Output Voltage During
Power-Down
V
OD
50Ω load, each side
to V
CC
OUTLEVEL = HIGH
OUTLEVEL = LOW
800
350
V
CC
-
600
V
CC
-
10
1000
500
V
CC
V
CC
-
400
V
CC
+10
1200
650
mV
P-P
mV
mV
mV
V
ID
V
CM
R
IN
Single-ended
At cable input
800
V
CC
-
0.4
45
50
1000
1400
V
CC
+
0.1
55
mV
P-P
V
Ω
Differential peak-to-peak at EQ input with
165MHz clock
50
mV
P-P
1dB skin-effect loss at 825MHz
24dB skin-effect loss at 825MHz
40dB skin-effect loss at 825MHz
20
0.2
0.2
0.2
Bits
UI
SYMBOL
I
CC
CONDITIONS
PWRDWN
= HIGH
PWRDWN
= LOW
DC to 500kHz
MIN
TYP
165
10
200
MAX
230
UNITS
mA
mV
P-P
Single-ended, OUTLEVEL = HIGH
Single-ended, OUTLEVEL = HIGH
Single-ended,
PWRDWN
= LOW
2
_______________________________________________________________________________________
TMDS Digital Video Equalizer for DVI/HDMI
Cables
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +70°C. Typical Values are at V
CC
= +3.3V, external terminations = 50Ω ±1%, TMDS rate =
250Mbps to 1.65Gbps, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Common-Mode Output Voltage
Rise/Fall Time (Note 1)
LVTTL CONTROL AND STATUS INTERFACE
LVTTL Input High Voltage
LVTTL Input Low Voltage
LVTTL Input High Current
LVTTL Input Low Current
Open-Collector Output High
Open-Collector Output Low
Open-Collector Output Sink
V
IH
V
IL
V
IH(MIN)
< V
IN
< V
CC
GND < V
IN
< V
IL(MAX)
R
LOAD
≥
10kΩ to V
CC
R
LOAD
≥
2kΩ to V
CC
2.4
0.4
5
2.0
0.8
-50
-100
V
V
µA
µA
V
V
mA
SYMBOL
CONDITIONS
50Ω load, each side to V
CC
,
OUTLEVEL = HIGH
20% to 80%
80
MIN
TYP
V
CC
-
0.25
130
200
MAX
UNITS
V
ps
MAX3815
Note 1:
AC specifications are guaranteed by design and characterization.
Note 2:
Cable input swing is 800mV to 1400mV differential peak-to-peak. Residual output jitter is defined as peak-to-peak determin-
istic jitter + 14.2 times random jitter.
Note 3:
Test pattern is a 2
7
- 1 PRBS + 20 ones + 2
7
- 1 PRBS (inverted) + 20 zeros.
Typical Operating Characteristics
(Typical values are at V
CC
= +3.3V, T
A
= +25°C, data pattern = 2
7
- 1 PRBS + 20 ones + 2
7
- 1 PRBS (inverted) + 20 zeros, unless
otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX3815 toc01
DIFFERENTIAL INPUT RETURN LOSS
vs. FREQUENCY
MAX3815 toc02
EQUALIZER INPUT AFTER 205ft OF GORE 89
CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)
MAX3815 toc03
200
190
180
SUPPLY CURRENT (mA)
170
OUTLEVEL = HIGH
0
-5
-10
-15
GAIN (dB)
-20
-25
-30
-35
-40
-45
-50
DATA RATE = 1.65Gbps
40dB CABLE SKIN-EFFECT LOSS AT 825MHz
128mV/div
160
150
140
130
120
110
100
0
10
20
30
40
50
60
70
TEMPERATURE (°C)
OUTLEVEL = LOW
350mV/div
0
500
1000
1500
2000
2500
3000
5ns/div
FREQUENCY (MHz)
_______________________________________________________________________________________
3
TMDS Digital Video Equalizer for DVI/HDMI
Cables
MAX3815
Typical Operating Characteristics (continued)
(Typical values are at V
CC
= +3.3V, T
A
= +25°C, data pattern = 2
7
- 1 PRBS + 20 ones + 2
7
- 1 PRBS (inverted) + 20 zeros, unless
otherwise noted.)
EQUALIZER INPUT EYE AFTER 205ft OF GORE 89
CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)
MAX3815 toc04
EQUALIZER INPUT EYE AFTER 205ft OF GORE 89
CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)
MAX3815 toc05
EQUALIZER EYES AFTER 100ft MADISON DIGITAL
FLAT-PANEL CABLE, 28 AWG (DATA RATE = 1.65Gbps)
MAX3815 toc06
DATA RATE = 1.65Gbps
40dB CABLE SKIN-EFFECT LOSS AT 825MHz
DATA RATE = 250Mbps
40dB CABLE SKIN-EFFECT LOSS AT 825MHz
350mV/div
300mV/div
350mV/div
152ps/div
1ns/div
200ps/div
EQUALIZER EYES AFTER 100ft MADISON DIGITAL
FLAT-PANEL CABLE, 28 AWG (DATA RATE = 350Mbps)
MAX3815 toc07
EQUALIZER EYES AFTER 3ft CABLE
(DATA RATE = 1.65Gbps)
MAX3815 toc08
JITTER vs. DATA RATE AFTER 205ft CABLE
WITH 40dB SKIN-EFFECT LOSS AT 825MHz
GORE 89 CABLE
100
80
60
40
20
DETERMINISTIC JITTER
0
RESIDUAL JITTER =
DJ + 14.2 x RJ
MAX3815 toc09
120
350mV/div
350mV/div
JITTER (ps
P-P
)
1ns/div
200ps/div
250
450
650
850
1050 1250 1450 1650
DATA RATE (Mbps)
TOTAL JITTER vs. POWER-SUPPLY
NOISE FREQUENCY (DATA RATE = 1.65Gbps)
MAX3815 toc10
DETERMINISTIC JITTER vs. CABLE LENGTH
(TENSOLITE TWIN-AX 28 AWG)
MAX3815 toc11
RESIDUAL JITTER vs. SIGNAL AMPLITUDE
INPUT TO CABLE (DATA RATE = 1.65Gbps)
205ft OF GORE 89 CABLE WITH 40dB SKIN-
EFFECT LOSS AT 825MHz
RESIDUAL JITTER = DJ + 14.2 X RJ
MAX3815 toc12
180
170
TOTAL JITTER (ps
P-P
)
160
150
140
130
120
110
100
1
0.6
1.65Gbps
DETERMINISTIC JITTER (UI
P-P
)
0.5
800Mbps
0.4
250Mbps
0.3
0.2
0.1
0
NO EQ
NOISE AMPLITUDE: 200mV
P-P
DATA THROUGH 100ft MADISON DIGITAL
FLAT-PANEL CABLE, 28AWG
120
110
RESIDUAL JITTER (ps
P-P
)
100
90
80
70
60
WITH
MAX3815 EQ
10
100
1000
10,000 100,000
0
50
100
CABLE LENGTH (ft)
150
200
0.6
0.8
1.0
1.2
1.4
FREQUENCY (kHz)
DIFFERENTIAL AMPLITUDE (mV
P-P
)
4
_______________________________________________________________________________________
TMDS Digital Video Equalizer for DVI/HDMI
Cables
Typical Operating Characteristics (continued)
(Typical values are at V
CC
= +3.3V, T
A
= +25°C, data pattern = 2
7
- 1 PRBS + 20 ones + 2
7
- 1 PRBS (inverted) + 20 zeros, unless
otherwise noted.)
EQCONTROL VOLTAGE (RELATIVE TO V
CC
)
vs. CABLE LENGTH (MANUAL EQ CONTROL)
0
-0.1
EQCONTROL VOLTAGE (V)
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
-0.9
-1.0
0
20
40
60
80
100
CABLE LENGTH (ft)
RESIDUAL JITTER
AT 1.65Gbps
CABLE IS TENSOLITE TWIN-AX
28 AWG WITH APPROXIMATELY
0.34dB OF LOSS PER FOOT AT
825MHz
EQCONTROL VOLTAGE
MAX3815 toc13
MAX3815
EQUALIZER OUTPUT EYE AFTER 120ft
OF CABLE (DATA RATE = 1.65Gbps)
MAX3815 toc14
LOSS-OF-CLOCK ASSERT THRESHOLD
vs. CABLE LENGTH
DIFFERENTIAL CLOCK AMPLITUDE (mV
P-P
)
CABLE IS TENSOLITE TWIN-AX 28 AWG
300
250
200
150
100
50
25MHz CLOCK FREQUENCY
0
0
20
40
60
80
100
120
MAX3815 toc15
200
180
160
140
120
100
80
60
40
20
RESIDUAL JITTER (ps
P-P
)
350
CABLE IS TENSOLITE
TWIN-AX 28 AWG
200mV/div
165MHz CLOCK FREQUENCY
0
120
100ps/div
CABLE LENGTH (ft)
Pin Description
PIN
1, 4, 5, 8, 9,
12, 13, 16,
38, 41, 43, 44
2
3
6
7
10
11
14
15
NAME
V
CC
RX0_IN-
RX0_IN+
RX1_IN-
RX1_IN+
RX2_IN-
RX2_IN+
RXC_IN+
RXC_IN-
FUNCTION
Supply Voltage. All pins must be connected to V
CC
.
Negative Data Input, CML
Positive Data Input, CML
Negative Data Input, CML
Positive Data Input, CML
Negative Data Input, CML
Positive Data Input, CML
Positive Clock Input, CML
Negative Clock Input, CML
17
Equalizer Control. This pin allows the user to control the equalization level of the MAX3815. Connect
the pin to GND for automatic operation. Set the voltage to V
CC
/ 2 for minimum equalization, or set
EQCONTROL
the voltage between V
CC
- 1V to V
CC
for manual equalization. See the
Typical Operating
Characteristics
for more information.
CLKLOS
PWRDWN
Loss-of-Clock Signal Output, LVTTL Open Collector. This pin asserts low upon loss of the input TMDS
clock from the cable.
Power-Down Input, LVTTL. This input allows the IC to be powered down to conserve power. Connect
high for normal operation. Pull low for power-down mode.
18
19
_______________________________________________________________________________________
5
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