19-4822; Rev 0; 7/09
TION KIT
EVALUA BLE
AVAILA
TMDS Digital Video Equalizer for
HDMI/DVI Cables
Features
S
Guaranteed Performance to 2.25Gbps (HDMI 1.3),
General Description
The MAX3815A cable equalizer automatically provides
compensation for DVI™ and HDMI™ v1.3 cables. It
extends the usable cable distance up to 40 meters
(1.65Gbps) and 35 meters (2.25Gbps). The MAX3815A
is designed to equalize signals encoded in the transition-
minimized differential signaling (TMDS®) format.
The MAX3815A 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 signal.
The outputs include a disable function. Upon LOS, the
chip is powered down. For direct chip-to-chip communi-
cation, the output drivers can be switched to one-half the
DVI output specification to conserve power and reduce
EMI. The output drive current can also be increased to
allow the use of back termination resistors for improved
signal integrity. Equalization can be automatic or set to
manual control for specific in-cable applications.
The MAX3815A is available in a 7mm x 7mm, 48-pin
TQFP-EP package and operates over a 0°C to +70°C
temperature range.
MAX3815A
Improved Jitter Performance at Low Source
Amplitude, and Enhanced Output Driver
0 to 35 Meters Over HDMI Cable, 24 AWG
0 to 22 Meters Over HDMI Cable, 28 AWG
0 to 40 Meters Over HDMI Cable, 24 AWG
0 to 28 Meters Over HDMI Cable, 28 AWG
S
Extends 2.25Gbps TMDS Interface Length
S
Extends 1.65Gbps TMDS Interface Length
S
Compatible with HDTV Resolutions 720p, 1080i,
1080p, and 1080p with 36-Bit Color
S
Compatible with Computer Resolutions VGA,
SVGA, XGA, SXGA, UXGA, and WUXGA
Required
S
Fully Automatic Equalization, No System Control
S
3.3V Power Supply
S
Power Dissipation of 0.6W (typ)
S
7mm x 7mm, 48-Pin TQFP Lead-Free Package
Applications
Front-Projector HDMI/DVI Inputs
High-Definition Televisions and Displays
HDMI/DVI-D Cable-Extender Modules and Active
Cable Assemblies
LCD Computer Monitors
HDMI 1.3 Deep Color Systems
PART
MAX3815ACCM+
Ordering Information
TEMP RANGE
0NC to +70NC
PIN-PACKAGE
48 TQFP-EP*
+Denotes
a lead(Pb)-free/RoHS compliant package.
*EP
= Exposed pad.
Pin Configuration appears at end of data sheet.
Typical Operating Circuits
HDMI OR DVI EXTENDER BOX
VIDEO SOURCE
UP TO 35m OF HDMI
OR
DVI CABLE
MAX3815A
EQUALIZER
STANDARD LENGTH
DVI-D OR HDMI CABLE
HDTV
MAX3816A
DDC EXTENDER
Typical Operating Circuits continued at end of data sheet.
DVI is a trademark of Digital Display Working Group.
HDMI is a trademark of HDMI Licensing, LLC.
TMDS is a registered trademark 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.
TMDS Digital Video Equalizer for
HDMI/DVI Cables
MAX3815A
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Range, V
CC
................................-0.5V to +4.0V
Voltage Range at Output CML Pins .....................-0.5V to +4.0V
Voltage Range at Input CML Pins, RES, VCC_T,
and GND_T ............................................ -0.5V to (V
CC
+ 0.7V)
Voltage Between Input CML Complementary Pair ........... ±3.3V
Voltage Between Output CML Complementary Pair ........ ±1.4V
Continuous Power Dissipation (T
A
= +70°C)
48-Pin TQFP (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 +3.5V, T
A
= 0°C to +70°C. Typical Values are at V
CC
= +3.3V, external terminations = 50Ω ±1%, MAX3815A in
automatic equalization mode (EQCONTROL = GND), TMDS rate = 250Mbps to 2.25Gbps, 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)
Residual Output Jitter (Cables
Only) 1.65Gbps to 2.25Gbps
(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)
50W load, each side
to V
CC
OUTLEVEL = HIGH
OUTLEVEL = LOW
800
1000
500
910
V
CC
V
CC
-
600
V
CC
-
10
V
CC
-
400
V
CC
+
10
mV
mV
mV
1200
mV
P-P
V
ID
V
CM
R
IN
Single-ended
At cable input
800
V
CC
-
0.4
45
50
1000
1200
V
CC
+
0.1
55
mV
P-P
V
W
Differential peak-to-peak at EQ input
with max 225MHz clock (see the
Typical
Operating Characteristics
for more
information)
50
mV
P-P
1dB skin-effect loss at 825MHz
24dB skin-effect loss at 825MHz
1dB skin-effect loss at 825MHz
24dB skin-effect loss at 825MHz
20
0.05
UI
0.13
0.1
0.14
0.28
0.21
UI
Bits
SYMBOL
I
CC
CONDITIONS
Clock present
(CLKLOS
= HIGH)
Clock and data absent
(CLKLOS
= LOW)
DC to 500kHz
MIN
TYP
210
12
200
MAX
270
UNITS
mA
mV
P-P
Differential Output-Voltage Swing
V
OD
With back termination as shown in Figure 4,
OUTLEVEL = OPEN
Single-ended, OUTLEVEL = HIGH
Single-ended, OUTLEVEL = HIGH
Single-ended
Output-Voltage High
Output-Voltage Low
Output Voltage During Clock
Absence
(CLKLOS
= LOW)
2
______________________________________________________________________________________
TMDS Digital Video Equalizer for
HDMI/DVI Cables
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.5V to +3.5V, T
A
= 0°C to +70°C. Typical Values are at V
CC
= +3.3V, external terminations = 50Ω ±1%, MAX3815A in
automatic equalization mode (EQCONTROL = GND), TMDS rate = 250Mbps to 2.25Gbps, 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
Voltage
Open-Collector Output Low
Voltage
Open-Collector Output Sink
Current
OUTLEVEL Input Open-State
Current Tolerance
±5
V
IH
V
IL
V
IH(MIN)
< V
IN
< V
CC
GND < V
IN
< V
IL(MAX)
R
LOAD
≥ 10kW to V
CC
R
LOAD
≥ 2kW to V
CC
2.4
0.4
5
2.0
0.8
±50
-100
V
V
µA
µA
V
V
mA
µA
SYMBOL
CONDITIONS
50W load, each side to V
CC
,
OUTLEVEL = HIGH
20% to 80%
80
MIN
TYP
V
CC
-
0.25
160
MAX
UNITS
V
ps
MAX3815A
Note 1:
AC specifications are guaranteed by design and characterization.
Note 2:
Cable input swing is 800mV to 1200mV differential peak-to-peak. Residual output jitter is defined as peak-to-peak jitter,
both deterministic plus random, as measured using an oscilloscope histogram with 5000 hits. Source jitter subtracted.
Note 3:
Test pattern is a 2
7
- 1 PRBS + 20 ones + 2
7
- 1 PRBS (inverted) + 20 zeros.
(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, equalizer
in automatic mode, cable launch amplitude 1V
P-P
differential, unless otherwise noted.)
SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
240
230
SUPPLY CURRENT (mA)
220
200
190
180
170
160
150
0
10
20
30
40
50
60
70
AMBIENT TEMPERATURE (°C)
GAIN (dB)
210
Typical Operating Characteristics
INPUT RETURN LOSS vs. FREQUENCY
MAX3815A toc02
OUTLEVEL = OPEN, EQCONTROL = V
CC
,
CLOCK SIGNAL ACTIVE
-5
-10
-15
-20
-25
-30
TMDS SOURCE DC-COUPLED TO MAX3815A
INPUT (NOMINAL AMPLITUDE)
TMDS SOURCE AC-COUPLED TO MAX3815A
-35
-40
0
500
1000
1500
2000
2500
3000
FREQUENCY (MHz)
_______________________________________________________________________________________
MAX3815A toc02
250
0
3
TMDS Digital Video Equalizer for
HDMI/DVI Cables
MAX3815A
(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, equalizer
in automatic mode, cable launch amplitude 1V
P-P
differential, unless otherwise noted.)
EQUALIZER INPUT AFTER 100ft OF 26 AWG
CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)
MAX3815A toc03
Typical Operating Characteristics (continued)
EQUALIZER INPUT EYE AFTER 100ft OF 26 AWG
CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)
MAX3815A toc04
DATA RATE = 2.25Gbps
30dB CABLE SKIN-EFFECT LOSS AT 1.11GHz
20mV/div
350mV/div
DATA RATE = 2.25Gbps
30dB CABLE SKIN-EFFECT LOSS AT 1.11GHz
500mV/div
5ns/div
100ps/div
EQUALIZER INPUT EYE AFTER 150ft OF 26 AWG
CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)
MAX3815A toc05
TOTAL JITTER vs. DATA RATE
(50m HDMI CABLE)
200
180
160
TOTAL JITTER (ps
P-P
)
140
120
100
80
60
40
20
0
250
750
0.1
0.2
MAX3815A toc06
DATA RATE = 742.5Mbps
24dB CABLE SKIN-EFFECT LOSS AT 370MHz
DVIGear SHR™ HDMI CABLE (22 AWG)
PEAK-TO-PEAK JITTER
IN PICOSECONDS
0.5
0.4
0.3
TOTAL JITTER (UI
P-P
)
350mV/div
PEAK-TO-PEAK JITTER
IN UNIT INTERVALS
1250
DATA RATE (Mbps)
1750
2250
0
300ps/div
TOTAL JITTER vs. POWER-SUPPLY NOISE
FREQUENCY (DATA RATE = 2.25Gbps)
170
TOTAL JITTER (ps
P-P
)
160
150
140
130
120
110
100
1
10
100
FREQUENCY (kHz)
1000
10,000
NOISE AMPLITUDE: 200mV
P-P
DATA THROUGH 50m DVIGear SHR
HDMI CABLE, 22 AWG
SHR is a trademark of DVIGear, Inc.
4
______________________________________________________________________________________
MAX3815A toc07
180
TMDS Digital Video Equalizer for
HDMI/DVI Cables
(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, equalizer
in automatic mode, cable launch amplitude 1V
P-P
differential, unless otherwise noted.)
TOTAL JITTER vs. CABLE LENGTH (CARLISLE
INTERCONNECT TECHNOLOGIES TWIN-AX 28 AWG)
MAX3815A toc08
Typical Operating Characteristics (continued)
MAX3815A
DETERMINISTIC JITTER (UI
P-P
)
0.5
0.4
0.3
0.2
0.1
0
0
10
2.25Gbps
1.485Mbps
742.5Mbps
NO EQ
WITH MAX3815A EQ
120
TOTAL JITTER (ps
P-P
)
110
100
90
80
70
60
50m OF DVIGear SHR HDMI CABLE
WITH 35dB LOSS AT 1.11GHz
20
CABLE LENGTH (m)
30
40
50
0.4
0.6
0.8
1.0
1.2
1.4
1.6
DIFFERENTIAL AMPLITUDE (V
P-P
)
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
10
20
30
CABLE LENGTH (m)
MAX3815A toc10
LOSS-OF-CLOCK ASSERT THRESHOLD
vs. CABLE LENGTH
180
RESIDUAL JITTER (ps
P-P
)
160
140
120
100
80
60
40
20
0
DIFFERENTIAL CLOCK AMPLITUDE (mV
P-P
)
300
250
200
150
100
50
0
0
6
12
18
24
30
36
CABLE LENGTH (m)
CABLE IS CARLISLE INTERCONNECT
TECHNOLOGIES TWIN-AX 28 AWG WITH
APPROXIMATELY 1.35dB OF LOSS
PER METER AT 1.11GHz
EQCONTROL VOLTAGE
CLOCK AMPLITUDE IS AT INPUT OF CABLE
CABLE IS CARLISLE INTERCONNECT
TECHNOLOGIES TWIN-AX, 28 AWG
225MHz CLOCK
FREQUENCY
25MHz CLOCK
FREQUENCY
RESIDUAL JITTER
AT 2.25Gbps
EQUALIZER OUTPUT EYE AFTER 50m OF 22 AWG
HDMI CABLE (DATA RATE = 2.25Gbps)
MAX3815A toc12
DVIGear SHR HDMI CABLE
200mV/div
100ps/div
_______________________________________________________________________________________
MAX3815A toc11
200
350
MAX3815A toc09
0.6
TOTAL JITTER vs. SIGNAL AMPLITUDE INPUT
TO CABLE (DATA RATE 2.25Gbps)
130
5
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