MAXIM MAX3815A Technical data

19-4822; Rev 0; 7/09

Typical Operating Circuits

EVALUATION KIT

AVAILABLE

TMDS Digital Video Equalizer for

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 transition­minimized differential signaling (TMDS®) format.

The MAX3815A features four CML-differential inputs and
outputs (three data and one clock). It provides a loss-of­signal (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 communi­cation, 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.

HDMI/DVI Cables

Features

Guaranteed Performance to 2.25Gbps (HDMI 1.3),

S

Improved Jitter Performance at Low Source
Amplitude, and Enhanced Output Driver

Extends 2.25Gbps TMDS Interface Length

S

0 to 35 Meters Over HDMI Cable, 24 AWG
0 to 22 Meters Over HDMI Cable, 28 AWG

Extends 1.65Gbps TMDS Interface Length

S

0 to 40 Meters Over HDMI Cable, 24 AWG
0 to 28 Meters Over HDMI Cable, 28 AWG

Compatible with HDTV Resolutions 720p, 1080i,

S

1080p, and 1080p with 36-Bit Color

Compatible with Computer Resolutions VGA,

S

SVGA, XGA, SXGA, UXGA, and WUXGA

Fully Automatic Equalization, No System Control

S

Required

3.3V Power Supply

S

Power Dissipation of 0.6W (typ)

S

7mm x 7mm, 48-Pin TQFP Lead-Free Package

S

MAX3815A

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

HDMI OR DVI EXTENDER BOX

UP TO 35m OF HDMI

OR

DVI CABLE

VIDEO SOURCE

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.

MAX3815A

EQUALIZER

MAX3816A

DDC EXTENDER

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX3815ACCM+

+Denotes a lead(Pb)-free/RoHS compliant package.
*EP = Exposed pad.

Pin Configuration appears at end of data sheet.

STANDARD LENGTH

DVI-D OR HDMI CABLE

0NC to +70NC

48 TQFP-EP*

HDTV

_______________________________________________________________ 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

ABSOLUTE MAXIMUM RATINGS

Supply Voltage Range, VCC ................................-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 (VCC + 0.7V)

Voltage Between Input CML Complementary Pair ........... ±3.3V

Voltage Between Output CML Complementary Pair ........ ±1.4V

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.

MAX3815A

ELECTRICAL CHARACTERISTICS

(VCC = +3.0V to +3.5V, TA = 0°C to +70°C. Typical values are at VCC = +3.3V, external terminations = 50Ω ±1%, MAX3815A in
automatic equalization mode (EQCONTROL = GND), TMDS rate = 250Mbps to 2.25Gbps, TA = +25°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Current I

Supply-Noise Tolerance DC to 500kHz 200 mV

EQUALIZER PERFORMANCE

Residual Output Jitter (Cables
Only) 0.25Gbps to 1.65Gbps
(Notes 1, 2, and 3)

CC

Clock present (CLKLOS = HIGH)
Clock and data absent (CLKLOS = LOW)

1dB skin-effect loss at 825MHz 0.05

24dB skin-effect loss at 825MHz 0.13 0.21

Continuous Power Dissipation (TA = +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

210 270

12

mA

P-P

UI

Residual Output Jitter (Cables
Only) 1.65Gbps to 2.25Gbps
(Notes 1, 2, and 3)

CID Tolerance 20 Bits

CONTROL AND STATUS

CLKLOS Assert Level

CML INPUTS (CABLE SIDE)

Differential Input-Voltage Swing V

Common-Mode Input Voltage V

Input Resistance R

CML OUTPUTS (ASIC SIDE)

Differential Output-Voltage Swing V

Output-Voltage High Single-ended, OUTLEVEL = HIGH V

Output-Voltage Low Single-ended, OUTLEVEL = HIGH

Output Voltage During Clock
Absence (CLKLOS = LOW)

CM

OD

1dB skin-effect loss at 825MHz 0.1

24dB skin-effect loss at 825MHz 0.14 0.28

Differential peak-to-peak at EQ input
with max 225MHz clock (see the Typical
Operating Characteristics for more
information)

At cable input 800 1000 1200 mV

ID

V

CC

0.4

Single-ended 45 50 55

IN

50W load, each side
to V

CC

With back termination as shown in Figure 4,
OUTLEVEL = OPEN

Single-ended

OUTLEVEL = HIGH 800 1000 1200
OUTLEVEL = LOW 500

V

CC

600

V

CC

10

50 mV

-

910

CC

-

-

V

V

V

CC

0.1

CC

400

CC

10

UI

+

V

W

mV

mV

­mV

+

mV

P-P

P-P

P-P

2 ______________________________________________________________________________________

TMDS Digital Video Equalizer for

HDMI/DVI Cables

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +3.0V to +3.5V, TA = 0°C to +70°C. Typical values are at VCC = +3.3V, external terminations = 50Ω ±1%, MAX3815A in
automatic equalization mode (EQCONTROL = GND), TMDS rate = 250Mbps to 2.25Gbps, TA = +25°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

-

Common-Mode Output Voltage

50W load, each side to VCC,
OUTLEVEL = HIGH

Rise/Fall Time (Note 1) 20% to 80% 80 160 ps

LVTTL CONTROL AND STATUS INTERFACE

LVTTL Input High Voltage V
LVTTL Input Low Voltage V
LVTTL Input High Current V

IH

IL

< VIN < V

IH(MIN)

LVTTL Input Low Current GND < VIN < V

Open-Collector Output High
Voltage

Open-Collector Output Low
Voltage

R

LOAD

R

LOAD

≥ 10kW to V

≥ 2kW to V

CC

IL(MAX)

CC

CC

2.0 V

2.4 V

Open-Collector Output Sink
Current

OUTLEVEL Input Open-State
Current Tolerance

CC

0.25

0.8 V

±50 µA

-100 µA

0.4 V

5 mA

±5 µA

V

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 27 - 1 PRBS + 20 ones + 27 - 1 PRBS (inverted) + 20 zeros.

Typical Operating Characteristics

(Typical values are at VCC = +3.3V, TA = +25°C, data pattern = 27 - 1 PRBS + 20 ones + 27 - 1 PRBS (inverted) + 20 zeros, equalizer
in automatic mode, cable launch amplitude 1V

SUPPLY CURRENT

vs. AMBIENT TEMPERATURE

250

OUTLEVEL = OPEN, EQCONTROL = VCC,

240

CLOCK SIGNAL ACTIVE

230

220

210

200

TMDS SOURCE DC-COUPLED TO MAX3815A

190

180

SUPPLY CURRENT (mA)

170

160

150

INPUT (NOMINAL AMPLITUDE)

TMDS SOURCE AC-COUPLED TO MAX3815A

0 70

AMBIENT TEMPERATURE (°C)

differential, unless otherwise noted.)

P-P

0

MAX3815A toc02

605030 402010

-5

-10

-15

-20

GAIN (dB)

-25

-30

-35

-40

INPUT RETURN LOSS vs. FREQUENCY

0 3000

FREQUENCY (MHz)

25002000500 1000 1500

MAX3815A toc02

_______________________________________________________________________________________ 3

TMDS Digital Video Equalizer for
HDMI/DVI Cables

Typical Operating Characteristics (continued)

(Typical values are at VCC = +3.3V, TA = +25°C, data pattern = 27 - 1 PRBS + 20 ones + 27 - 1 PRBS (inverted) + 20 zeros, equalizer
in automatic mode, cable launch amplitude 1V

EQUALIZER INPUT AFTER 100ft OF 26 AWG

CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)

DATA RATE = 2.25Gbps
30dB CABLE SKIN-EFFECT LOSS AT 1.11GHz

differential, unless otherwise noted.)

P-P

MAX3815A toc03

EQUALIZER INPUT EYE AFTER 100ft OF 26 AWG

CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)

DATA RATE = 2.25Gbps
30dB CABLE SKIN-EFFECT LOSS AT 1.11GHz

MAX3815A toc04

MAX3815A

20mV/div

500mV/div

EQUALIZER INPUT EYE AFTER 150ft OF 26 AWG

CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)

DATA RATE = 742.5Mbps
24dB CABLE SKIN-EFFECT LOSS AT 370MHz

350mV/div

SHR is a trademark of DVIGear, Inc.

5ns/div

300ps/div

MAX3815A toc05

TOTAL JITTER vs. POWER-SUPPLY NOISE

FREQUENCY (DATA RATE = 2.25Gbps)

180

NOISE AMPLITUDE: 200mV
DATA THROUGH 50m DVIGear SHR

170

HDMI CABLE, 22 AWG

160

)

P-P

150

140

130

TOTAL JITTER (ps

120

110

100

1 10,000

FREQUENCY (kHz)

P-P

350mV/div

100010010

100ps/div

TOTAL JITTER vs. DATA RATE

(50m HDMI CABLE)

200

DVIGear SHR™ HDMI CABLE (22 AWG)

180

160

)

140

P-P

120

100

80

TOTAL JITTER (ps

60

40

20

0

250 2250

MAX3815A toc07

PEAK-TO-PEAK JITTER

IN PICOSECONDS

PEAK-TO-PEAK JITTER

IN UNIT INTERVALS

17501250750

DATA RATE (Mbps)

MAX3815A toc06

0.5

0.4

0.3

0.2

0.1

0

)

P-P

TOTAL JITTER (UI

4 ______________________________________________________________________________________