LMH0034MAXNOPB - NATIONAL SEMICONDUCTOR

LMH0024

LMH0024 3.3V SMPTE 259M / 344M Adaptive Cable Equalizer

Literature Number: SNLS210F

LMH0024

May 16, 2011

3.3V SMPTE 259M / 344M Adaptive Cable Equalizer

General Description

The LMH0024 SMPTE 259M / 344M adaptive cable equalizer

is a monolithic integrated circuit for equalizing data transmit-

ted over cable (or any media with similar dispersive loss

characteristics). The equalizer operates over a wide range of

data rates from 125 Mbps to 540 Mbps and supports SMPTE

259M and SMPTE 344M.

The LMH0024 implements DC restoration to correctly handle

pathological data conditions. DC restoration can be bypassed

for low data rate applications. The equalizer is flexible in al-

lowing either single-ended or differential input drive.

Additional features include a mute pin which can be used to

manually mute the output and a cable length indicator which

determines the amount of cable being equalized.

Features

■SMPTE 259M and SMPTE 344M compliant

■Supports DVB-ASI at 270 Mbps

■Data rates: 125 Mbps to 540 Mbps

■Equalizes up to 350 meters of Belden 1694A at 270 Mbps

■Manual bypass, cable length indicator, and output mute

■Single-ended or differential input

■50Ω differential outputs

■Single 3.3V supply operation

■Industrial temperature range: −40°C to +85°C

■198 mW typical power consumption with 3.3V supply

■Footprint compatible with the LMH0034 and the GS9064

Applications

■SMPTE 259M and SMPTE 344M serial digital interfaces

■Serial digital data equalization and reception

■Data recovery equalization

Typical Application

20172501

LMH0024 3.3V SMPTE 259M / 344M Adaptive Cable Equalizer

Absolute Maximum Ratings (Note 1)

Supply Voltage −0.5V to 3.6V

Input Voltage (all inputs) −0.3V to VCC+0.3V

Storage Temperature Range −65°C to +150°C

Junction Temperature +150°C

Lead Temperature

(Soldering 4 Sec) +260°C

Package Thermal Resistance

θJA 16-pin SOIC

θJC 16-pin SOIC

+115°C/W

+105°C/W

ESD Rating (HBM) 8 kV

ESD Rating (MM) 250V

Recommended Operating

Conditions

Supply Voltage (VCC – VEE) 3.3V ±5%

Input Coupling Capacitance 1.0 µF

AEC Capacitor (Connected between

AEC+ and AEC-) 1.0 µF

Operating Free Air Temperature (TA) −40°C to +85°C

DC Electrical Characteristics

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 2, Note 3).

Symbol Parameter Conditions Reference Min Typ Max Units

VCMIN Input Common Mode Voltage SDI, SDI 1.9 V

VSDI Input Voltage Swing At LMH0024 input, (Note 4,

Note 6)720 800 950 mVP−P

VCMOUT Output Common Mode Voltage SDO, SDO VCC –

VSDO/2 V

VSDO Output Voltage Swing 50Ω load, differential 750 mVP-P

CLI DC Voltage 0m cable, (Note 7) CLI 2.5 V

Max cable, (Note 7) 2.0 V

MUTE Input Voltage Min to mute outputs MUTE 3.0 V

Max to force outputs active 2.0 V

ICC Supply Current (Note 8) 60 77 mA

www.national.com 2

LMH0024

AC Electrical Characteristics

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3).

Symbol Parameter Conditions Reference Min Typ Max Units

BRMIN Minimum Input Data Rate SDI, SDI 125 Mbps

BRMAX Maximum Input Data Rate 540 Mbps

Maximum Equalized Cable

Length (with equalizer

pathological)

270 Mbps, Belden 1694A,

0.2UI output jitter, (Note 4)

350 m

270 Mbps, Belden 8281,

0.2UI output jitter, (Note 4) 280 m

540 Mbps, Belden 1694A,

0.2UI output jitter, (Note 4) 250 m

540 Mbps, Belden 8281,

0.2UI output jitter, (Note 4) 180 m

tr,tfOutput Rise Time, Fall Time 20% – 80%, (Note 4) SDO, SDO 100 220 ps

Mismatch in Rise/Fall Time (Note 4) 2 15 ps

tOS Output Overshoot (Note 4) 1 5 %

ROUT Output Resistance single-ended, (Note 5) 50 Ω

RLIN Input Return Loss (Note 9) SDI, SDI 15 18-20 dB

RIN Input Resistance single-ended 1.3 kΩ

CIN Input Capacitance single-ended, (Note 5) 1 pF

Note 1: "Absolute Maximum Ratings" are those parameter values beyond which the life and operation of the device cannot be guaranteed. The stating herein of

these maximums shall not be construed to imply that the device can or should be operated at or beyond these values. The table of "Electrical Characteristics"

specifies acceptable device operating conditions.

Note 2: Current flow into device pins is defined as positive. Current flow out of device pins is defined as negative. All voltages are stated referenced to VEE = 0

Volts.

Note 3: Typical values are stated for VCC = +3.3V and TA = +25°C.

Note 4: Specification is guaranteed by characterization.

Note 5: Specification is guaranteed by design.

Note 6: The maximum input voltage swing assumes a nonstressing, DC-balance signal; specifically, the SMPTE-recommended color bar test signal. Pathological

or other stressing signals may not be used. This specification is for 0m cable only.

Note 7: Input signal must be present for valid CLI. Refer to Figure 1 for typical results.

Note 8: Supply current depends on the amount of cable being equalized. The current is highest for short cable and decreases as the cable length is increased.

Refer to Figure 2.

Note 9: Input return loss is dependent on board design. The LMH0024 meets this specification on the SD024 evaluation board from 5MHz to 1.5GHz.

3 www.national.com

LMH0024

Connection Diagram

20172503

16-Pin SOIC

Order Number LMH0024MA

See NS Package Number M16A

Pin Descriptions

Pin # Name Description

1 CLI Cable length indicator. Provides a voltage inversely proportional to the cable length being

equalized.

2 VCC Positive power supply (+3.3V).

3 VEE Negative power supply (ground).

4 SDI Serial data true input.

5 SDI Serial data complement input.

6 VEE Negative power supply (ground).

7 AEC+ AEC loop filter external capacitor (1µF) positive connection.

8 AEC- AEC loop filter external capacitor (1µF) negative connection.

9 BYPASS Bypasses equalization and DC restoration when high. No equalization occurs in this mode.

10 NC No connect.

11 VEE Negative power supply (ground).

12 SDO Serial data complement output.

13 SDO Serial data true output.

14 VEE Negative power supply (ground).

15 VCC Positive power supply (+3.3V).

16 MUTE Output mute. To force SDO and SDO to mute, tie to VCC. To disable MUTE, tie to GND. Typical

application is MUTE tied to GND to enable the outputs. MUTE must be tied either high or low; it

may not be left unconnected.

www.national.com 4

LMH0024

Block Diagram

20172502

Device Operation

BLOCK DESCRIPTION

The Equalizer Filter block is a multi-stage adaptive filter. If

Bypass is high, the equalizer filter is disabled.

The DC Restoration / Level Control block receives the dif-

ferential signals from the equalizer filter block. This block

incorporates a self-biasing DC restoration circuit to fully DC

restore the signals. If Bypass is high, this function is disabled.

The signals before and after the DC Restoration / Level Con-

trol block are used to generate the Automatic Equalization

Control (AEC) signal. This control signal sets the gain and

bandwidth of the equalizer filter. The loop response in the

AEC block is controlled by an external 1µF capacitor placed

across the AEC+ and AEC- pins. Cable Length Indicator

(CLI) is derived from this block.

The Output Driver produces SDO and SDO. SDO and

SDO may be forced to mute by activating MUTE.

CABLE LENGTH INDICATOR (CLI)

The cable length indicator provides a voltage to indicate the

length of cable being equalized. The CLI voltage decreases

as the cable length increases. Figure 1 shows the typical CLI

voltage vs. Belden 1694A cable length. Note: CLI is only valid

when an input signal is present.

0 50 100 150 200 250 300 350

1.8

1.9

2.0

2.1

2.2

2.3

2.4

2.5

2.6

CLI (V)

BELDEN 1694A CABLE LENGTH (m)

20172504

FIGURE 1. CLI vs. Belden 1694A Cable Length

MUTE

MUTE can be used to manually mute or enable the LMH0024

outputs. MUTE must be tied to a low-level input or ground for

SDO and SDO to be active. Applying a high input to MUTE

will mute the LMH0024 outputs.

INPUT INTERFACING

The LMH0024 accepts either differential or single-ended in-

put. The input must be AC coupled. Transformer coupling is

not supported.

5 www.national.com

LMH0024

The LMH0024 correctly handles equalizer pathological sig-

nals for standard definition serial digital video, as described

in SMPTE RP 178.

OUTPUT INTERFACING

The SDO and SDO outputs are internally loaded with 50Ω.

They produce a 750 mVP-P differential output, or a

375 mVP-P single-ended output.

Application Information

PCB LAYOUT RECOMMENDATIONS

Please refer to the following Application Note for the CLC034

on National's website: AN-1372, “LMH0034 PCB Layout

Techniques.” The PCB layout techniques in this application

note apply to the LMH0024 as well.

REPLACING THE GENNUM GS9064

The LMH0024 is footprint compatible with the Gennum

GS9064. Pin 16 (MUTE) of the LMH0024 must be connect to

ground for correct operation.

SUPPLY CURRENT VS. CABLE LENGTH

The supply current (ICC) depends on the amount of cable be-

ing equalized. The current is highest for short cable and

decreases as the cable length is increased. Figure 2 shows

supply current vs. Belden 1694A cable length for 270 Mbps

data.

20172515

FIGURE 2. Supply Current vs. Belden 1694A Cable

Length, 270 Mbps

www.national.com 6

LMH0024

Physical Dimensions inches (millimeters) unless otherwise noted

16-Pin SOIC

Order Number LMH0024MA

NS Package Number M16A

7 www.national.com

LMH0024

Notes

LMH0024 3.3V SMPTE 259M / 344M Adaptive Cable Equalizer

For more National Semiconductor product information and proven design tools, visit the following Web sites at:

www.national.com

Products Design Support

Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench

Audio www.national.com/audio App Notes www.national.com/appnotes

Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns

Data Converters www.national.com/adc Samples www.national.com/samples

Interface www.national.com/interface Eval Boards www.national.com/evalboards

LVDS www.national.com/lvds Packaging www.national.com/packaging

Power Management www.national.com/power Green Compliance www.national.com/quality/green

Switching Regulators www.national.com/switchers Distributors www.national.com/contacts

LDOs www.national.com/ldo Quality and Reliability www.national.com/quality

LED Lighting www.national.com/led Feedback/Support www.national.com/feedback

Voltage References www.national.com/vref Design Made Easy www.national.com/easy

PowerWise® Solutions www.national.com/powerwise Applications & Markets www.national.com/solutions

Serial Digital Interface (SDI) www.national.com/sdi Mil/Aero www.national.com/milaero

Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic

PLL/VCO www.national.com/wireless PowerWise® Design

University

www.national.com/training

THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION

(“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY

OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO

SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS,

IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS

DOCUMENT.

TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT

NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL

PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR

APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND

APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE

NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS.

EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO

LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE

AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR

PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY

RIGHT.

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR

SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and

whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected

to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform

can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness.

National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other

brand or product names may be trademarks or registered trademarks of their respective holders.

For the most current product information visit us at www.national.com

National Semiconductor

Americas Technical

Support Center

Email: support@nsc.com

Tel: 1-800-272-9959

National Semiconductor Europe

Technical Support Center

Email: europe.support@nsc.com

National Semiconductor Asia

Pacific Technical Support Center

Email: ap.support@nsc.com

National Semiconductor Japan

Technical Support Center

Email: jpn.feedback@nsc.com

www.national.com

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,

and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should

obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are

sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard

warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where

mandated by government requirements, testing of all parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and

applications using TI components. To minimize the risks associated with customer products and applications, customers should provide

adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,

or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information

published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a

warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual

property of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied

by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive

business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional

restrictions.

Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all

express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not

responsible or liable for any such statements.

TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably

be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing

such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and

acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products

and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be

provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in

such safety-critical applications.

TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are

specifically designated by TI as military-grade or "enhanced plastic."Only products designated by TI as military-grade meet military

specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at

the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.

TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are

designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated

products in automotive applications, TI will not be responsible for any failure to meet such requirements.

Following are URLs where you can obtain information on other Texas Instruments products and application solutions:

Products Applications

Audio www.ti.com/audio Communications and Telecom www.ti.com/communications

Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers

Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps

DLP®Products www.dlp.com Energy and Lighting www.ti.com/energy

DSP dsp.ti.com Industrial www.ti.com/industrial

Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical

Interface interface.ti.com Security www.ti.com/security

Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense

Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive

Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video

RFID www.ti-rfid.com

OMAP Mobile Processors www.ti.com/omap

Wireless Connectivity www.ti.com/wirelessconnectivity

TI E2E Community Home Page e2e.ti.com

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265