MAXIM MAX3815 Technical data

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 sig­nals 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 loss­of-signal (LOS) output that indicates loss-of-clock sig­nal. The outputs include a disable function or the
equalizer can be powered down to conserve power.
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. 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.

Applications

Front-Projector DVI/HDMI Inputs

High-Definition Televisions and Displays

DVI-D/HDMI Cable-Extender Modules and Active
Cable Assemblies

LCD Computer Monitors

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

TMDS Digital Video Equalizer for DVI/HDMI

Cables

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

RGB/HV

ADC/SYNC

TMDS

DESERIALIZER

SELECT

IMAGE
SCALER AND
PROCESSOR

PANEL

INTERFACE

TIMING AND

DRIVERS

LCD,
DLP,

OR

LCOS

VGA INPUT

DVI-D INPUT

DVI-D CABLE UP
TO 36m OR 120ft

(28AWG STP)

LAPTOP

VIDEO PROJECTOR

MAX3815

EQUALIZER

Typical Application Circuits

19-3466; Rev 2; 2/08

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.

EVALUATION KIT

AVAILABLE

+

Denotes lead-free package.

*EP = Exposed pad.

Typical Application Circuits continued at end of data sheet.

Pin Configuration appears 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.

PART

MAX3815CCM 0°C to +70°C 48 TQFP-EP*

MAX3815CCM+ 0°C to +70°C 48 TQFP-EP* C48E-8

TEMP

RANGE

PIN­PACKAGE

C48E-8

PKG

CODE

MAX3815

TMDS Digital Video Equalizer for DVI/HDMI
Cables

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

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

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, TA= 0°C to +70°C. Typical Values are at VCC= +3.3V, external terminations = 50Ω ±1%, TMDS rate =
250Mbps to 1.65Gbps, T

A

= +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)

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
Power-Down

CC

ID

CM

IN

OD

PWRDWN = HIGH 165 230
PWRDWN = LOW 10

1dB skin-effect loss at 825MHz 0.2

24dB skin-effect loss at 825MHz 0.2

40dB skin-effect loss at 825MHz 0.2

Differential peak-to-peak at EQ input with
165MHz clock

At cable input 800 1000 1400 mV

Single-ended 45 50 55 Ω

50Ω load, each side
to V

Single-ended, PWRDWN = LOW

CC OUTLEVEL = LOW 350 500 650

50 mV

V

-

CC

0.4

OUTLEVEL = HIGH 800 1000 1200

V

-

CC

600

V

-

CC

10

CC

V

V

CC

0.1

CC

400

V

CC

+10

+

-

mV

mA

P-P

UI

P-P

P-P

V

P-P

mV

mV

mV

MAX3815

TMDS Digital Video Equalizer for DVI/HDMI

Cables

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V, TA= 0°C to +70°C. Typical Values are at VCC= +3.3V, external terminations = 50Ω ±1%, TMDS rate =
250Mbps to 1.65Gbps, T

A

= +25°C, unless otherwise noted.)

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 + 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, unless
otherwise noted.)

SUPPLY CURRENT

vs. TEMPERATURE

MAX3815 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

605030 402010

110

120

130

140

150

160

170

180

190

200

100

070

OUTLEVEL = HIGH

OUTLEVEL = LOW

DIFFERENTIAL INPUT RETURN LOSS

vs. FREQUENCY

MAX3815 toc02

FREQUENCY (MHz)

GAIN (dB)

2500200015001000500

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

-50
0 3000

EQUALIZER INPUT AFTER 205ft OF GORE 89
CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)

MAX3815 toc03

5ns/div

128mV/div

350mV/div

DATA RATE = 1.65Gbps
40dB CABLE SKIN-EFFECT LOSS AT 825MHz

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Common-Mode Output Voltage

Rise/Fall Time (Note 1) 20% to 80% 80 130 200 ps

LVTTL CONTROL AND STATUS INTERFACE

LVTTL Input High Voltage V

LVTTL Input Low Voltage V

LVTTL Input High Current V

LVTTL Input Low Current GND < VIN < V

Open-Collector Output High

Open-Collector Output Low

Open-Collector Output Sink

50Ω load, each side to V

CC

OUTLEVEL = HIGH

IH

IL

< VIN < V

IH(MIN)

≥ 10kΩ to V

R

LOAD

R

≥ 2kΩ to V

LOAD

CC

IL(MAX)

CC

CC

,

V

CC

0.25

­V

2.0 V

0.8 V

-50 µA

-100 µA

2.4 V

0.4 V

5mA

MAX3815

TMDS Digital Video Equalizer for DVI/HDMI
Cables

4 _______________________________________________________________________________________

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, unless
otherwise noted.)

EQUALIZER INPUT EYE AFTER 205ft OF GORE 89

CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)

MAX3815 toc04

152ps/div

350mV/div

DATA RATE = 1.65Gbps
40dB CABLE SKIN-EFFECT LOSS AT 825MHz

EQUALIZER INPUT EYE AFTER 205ft OF GORE 89

CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)

MAX3815 toc05

1ns/div

300mV/div

DATA RATE = 250Mbps
40dB CABLE SKIN-EFFECT LOSS AT 825MHz

EQUALIZER EYES AFTER 100ft MADISON DIGITAL

FLAT-PANEL CABLE, 28 AWG (DATA RATE = 1.65Gbps)

MAX3815 toc06

200ps/div

350mV/div

EQUALIZER EYES AFTER 100ft MADISON DIGITAL

FLAT-PANEL CABLE, 28 AWG (DATA RATE = 350Mbps)

MAX3815 toc07

1ns/div

350mV/div

EQUALIZER EYES AFTER 3ft CABLE

(DATA RATE = 1.65Gbps)

MAX3815 toc08

200ps/div

350mV/div

JITTER vs. DATA RATE AFTER 205ft CABLE
WITH 40dB SKIN-EFFECT LOSS AT 825MHz

MAX3815 toc09

DATA RATE (Mbps)

JITTER (ps

P-P

)

14501250450 650 850 1050

20

40

60

80

100

120

0

250 1650

GORE 89 CABLE

RESIDUAL JITTER =
DJ + 14.2 x RJ

DETERMINISTIC JITTER

TOTAL JITTER vs. POWER-SUPPLY

NOISE FREQUENCY (DATA RATE = 1.65Gbps)

MAX3815 toc10

FREQUENCY (kHz)

TOTAL JITTER (ps

P-P

)

10,000100010 100

110

120

130

140

150

160

170

180

100

1 100,000

NOISE AMPLITUDE: 200mV

P-P

DATA THROUGH 100ft MADISON DIGITAL
FLAT-PANEL CABLE, 28AWG

0

0.2

0.1

0.4

0.3

0.5

0.6

0 10050 150 200

DETERMINISTIC JITTER vs. CABLE LENGTH

(TENSOLITE TWIN-AX 28 AWG)

MAX3815 toc11

CABLE LENGTH (ft)

DETERMINISTIC JITTER (UI

P-P

)

1.65Gbps

800Mbps

250Mbps

NO EQ

WITH

MAX3815 EQ

RESIDUAL JITTER vs. SIGNAL AMPLITUDE

INPUT TO CABLE (DATA RATE = 1.65Gbps)

MAX3815 toc12

DIFFERENTIAL AMPLITUDE (mV

P-P

)

RESIDUAL JITTER (ps

P-P

)

1.21.00.8

70

80

90

100

110

120

60

0.6 1.4

205ft OF GORE 89 CABLE WITH 40dB SKIN­EFFECT LOSS AT 825MHz
RESIDUAL JITTER = DJ + 14.2 X RJ