Datasheet

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General Description

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.

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.

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.

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.

Applications

Laptop PC TMDS Equalizer and Driver

Docking Station TMDS Equalizer and Driver

Cable TMDS Equalizer

Features

♦ Equalizes FR-4 Board Microstrip and Cable HF

Losses Up to 15dB at 825MHz for Operation at

0.25Gbps to 1.65Gbps

♦ Compatible with HDMI 1.3

♦ Less Than 0.2UI

P-P

Residual Jitter at 1.65Gbps for

0 to 15dB Channel Loss at 825MHz

♦ Input Terminations: 50Ω (Each Side to V

) ±10%

♦ Output of Driver is a Fully DVI/HDMI TMDS-

Compatible Cable Driver

♦ Output Amplitude: 1.05V

P-P

Differential

♦ Enable Pin to Select Normal Operation or Power-

Down Mode

♦ LEVEL Pin to Select Output Current for Use With

or Without Back Termination

♦ 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

Ratings of 5.5V (for Fault Conditions)

MAX3814

DVI/HDMI TMDS FR-4 and

Cable Equalizer/Driver

________________________________________________________________

Maxim Integrated Products

TERMINATED TO V

IND+/-

INC+/-

INB+/-

INA+/-

OUTD+/-

OUTC+/-

OUTB+/-

OUTA+/-

ENABLE

LEVEL

OUTPUT LEVEL CONTROL

MAX3814

EQUALIZER

LIMITING

AMPLIFIER

DRIVER 1

Simplified Functional Diagram

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX3814CHJ+ 0°C to +70°C 32 TQFP

19-0813; Rev 2; 12/10

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.

Denotes a lead(Pb)-free/RoHS-compliant package.

TMDS is a trademark of Silicon Image, Inc.

DVI is a trademark of Digital Display Working Group.

HDMI is a registered trademark and registered service mark of HDMI Licensing, LCC.

EVALUATION KIT

AVAILABLE

Pin Configuration appears at end of data sheet.

Summary of content (14 pages)

PAGE 1
9-0813; Rev 2; 12/10 KIT ATION EVALU E L B AVAILA DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver 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.
PAGE 2
MAX3814 DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver ABSOLUTE MAXIMUM RATINGS Termination-Supply Voltage Range.......................-0.5V to +4.0V Signal Voltage Range on Any One Signal Wire ....-0.5V to +4.0V CML Common-Mode Voltage Range on Any I/O Pair (sustained) .....................................-0.5V to +5.5V CML Common-Mode Voltage Range on Any I/O Pair (sustained, within VCC and GND) ...-3.3V to +3.3V, Differential CML Output Loading (termination)............................
PAGE 3
DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver (Typical values measured at VCC = 3.3V, TA = +25°C; external terminations = 50Ω ±1%; min/max values valid over VCC = 3.3V ±0.3V, TA = 0°C to +70°C; with external terminations = 50Ω ±1% to voltage = 3.3V ±0.7V. Tested at 1.65Gbps. AC parameters guaranteed by design and characterization.
PAGE 4
SPECIFICATION TABLES (continued) (Typical values measured at VCC = 3.3V, TA = +25°C; external terminations = 50Ω ±1%; min/max values valid over VCC = 3.3V ±0.3V, TA = 0°C to +70°C; with external terminations = 50Ω ±1% to voltage = 3.3V ±0.7V. Tested at 1.65Gbps. AC parameters guaranteed by design and characterization.) LVTTL/LVCMOS AND OPEN-COLLECTOR LVTTL PARAMETER CONDITIONS MIN TYP MAX UNITS 0.8 V DC PARAMETERS LVTTL Input High Voltage 2.
PAGE 5
DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver MAX3814 OUTPUT: 250Mbps DATA AFTER 30ft OF TENSOLITE 28 AWG CABLE MAX3814 toc04 125mV/div 140mVP-P/div 140mVP-P/div (INPUT SIGNAL LEVEL = 0dBm) (OUTPUT DISABLED) DETERMINISTIC JITTER vs. LENGTH OF FR-4 BOARD DETERMINISTIC JITTER vs. LENGTH OF 24 AWG CABLE (SOURCE SIGNAL LEVEL = 700mVP-P/1200mVP-P, DATA RATE = 0.825Gbps AND 1.65Gbps, LOSS = 0.209dB/in AT 820MHz) 200 SDD11 50 2.25Gbps 40 700mVP-P -15 150 1.
PAGE 6
DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver MAX3814 Pin Description 6 PIN NAME 1, 8, 17, 24 N.C. FUNCTION 2 INB+ Positive TMDS Input, CML 3 INB- Negative TMDS Input, CML 4, 5, 9, 32 VCC Power Supply. All pins must be connected to VCC. 6 INC+ Positive TMDS Input, CML 7 INC- Negative TMDS Input, CML 10 IND+ Positive TMDS Input, CML 11 IND- Negative TMDS Input, CML 12 ENABLE 13, 16, 20, 21, 25, 28 VEE No Connection. Not internally connected. Active-Low Enable Input, LVTTL.
PAGE 7
DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver The MAX3814 TMDS equalizer/driver accepts differential CML input data rates from 250Mbps to 1.65Gbps. It consists of four differential CML input buffers, four independent fixed equalizers, four limiting amplifiers, and four differential CML output buffers (Figure 1). The MAX3814 functions both as an equalizer and as a driver.
PAGE 8
MAX3814 DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver CML Inputs and Outputs The input buffers and the output drivers are currentmode logic (CML). See Figures 2, 3, and 4. The input buffers consist of a 50Ω load resistor connected to VCC and the input connected to a differential equalizer. The output drivers are open-collector. The current in these outputs can be adjusted to 10mA or 15mA with the control pin LEVEL.
PAGE 9
DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver MAX3814 VT VCC 50Ω TRANSIENT SUPRESSOR CLAMP 50Ω OUT_+ 44kΩ 200Ω OUT_BACK TERMINATION LEVEL, ENABLE INPUTS 44kΩ 88kΩ LEVEL = LOW ENABLE = HIGH 10mA 50kΩ TRANSIENT SUPRESSOR CLAMP 5mA Figure 4. Simplified Output Circuit with Back Termination Resistor Output Enable Control The ENABLE pin is an LVTTL input that allows the user to shut off the output-collector currents, thereby reducing power consumption of the device.
PAGE 10
MAX3814 DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver Laptop PC TMDS Equalizer and Driver As shown at location XX in Figure 6b, the MAX3814 equalizes trace losses and redrives the TMDS outputs at the docking connector. The 200Ω resistor at the output of the MAX3814 absorbs reflections from the docking connector. Dock or Port Expander The MAX3814 can also be used on the dock or port expander as it equalizes loss, isolates the connector, and redrives TMDS output signals at location YY as shown in Figure 6b.
PAGE 11
DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver • The 4-channel implementation treats all channels identically. Input and output data channel designations are only a guide. Polarity assignments can be swapped and channel paths can be interchanged. • An uninterrupted ground plane should be positioned beneath the high-speed I/Os. • Ground-path vias should be placed close to the IC and the input/output interfaces to allow a return current path to the IC and the DVI and HDMI inputs.
PAGE 12
DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver MAX3814 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 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% VCC VCC VCC LEVEL 3.3V ±10% MAX3814 50Ω 100Ω 0.1μF Z (DIFFERENTIAL) = 100Ω 0.
PAGE 13
DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver Chip Information VEE OUTC+ OUTC- N.C. 23 OUTB- 24 VEE OUTB+ TOP VIEW N.C. PROCESS: SiGe BiPOLAR 22 21 20 19 18 17 Package Information VEE 25 16 VEE OUTA- 26 15 OUTD+ OUTA+ 27 14 OUTD- 13 VEE VEE 28 MAX3814 12 ENABLE INA+ 30 11 IND- INA- 31 10 IND+ VCC 32 9 VCC LEVEL 29 For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PAGE 14
MAX3814 DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver Revision History REVISION NUMBER REVISION DATE 0 5/07 Initial release 1 9/07 Corrected TA = 0°C to +85°C to TA = 0°C to +70°C in the Specification Tables globals; replaced the package outline drawing with the Package Information table 2 12/10 DESCRIPTION PAGES CHANGED — Changed the operating ambient temperature max from 85°C (max) to 70°C (max) in the Operating Conditions table; added the package code and land pattern no.