Datasheet LMH0002 Datasheet (National Semiconductor)

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LMH0002
SMPTE 292M / 259M Serial Digital Cable Driver

LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver

January 2006

General Description

The LMH0002 SMPTE 292M / 259M serial digital cable
driver is a monolithic, high-speed cable driver designed for
use in SMPTE 292M / 259M serial digital video and ITU-T
G.703 serial digital data transmission applications. The
LMH0002 drives 75Ω transmission lines (Belden 8281,
Belden 1694A or equivalent) at data rates up to 1.485 Gbps.

The LMH0002 provides two selectable slew rates for
SMPTE 259M and SMPTE 292M compliance. The output
voltage swing is adjustable via a single external resistor.

The LMH0002 is powered from a single 3.3V supply. Power
consumption is typically 125mW in SD mode and 149mW in
HD mode.

Features

n SMPTE 292M, SMPTE 344M and SMPTE 259M

compliant

n Data rates to 1.485 Gbps
n Differential input
n 75Ω differential output
n Selectable slew rate
n Adjustable output amplitude
n Single 3.3V supply operation
n Operating temperature range: Commercial 0˚C to +70˚C

(LMH0002MA) or Industrial −40˚C to +85˚C
(LMH0002TMA)

n Typical power consumption: 125mW in SD mode and

149mW in HD mode

n Replaces the GS1528 and GS1528A

Applications

n SMPTE 292M, SMPTE 344M, and SMPTE 259M serial

digital interfaces

n Sonet/SDH and ATM interfaces
n Digital routers and switches
n Distribution amplifiers
n Buffer applications
n Set top boxes
n Security cameras

Typical Application

20176102

© 2006 National Semiconductor Corporation DS201761 www.national.com

Absolute Maximum Ratings (Note 1)

Supply Voltage: −0.5V to 3.6V

LMH0002

Input Voltage (all inputs) −0.3V to V

Output Current 28mA

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

Junction Temperature +150˚C

Lead Temperature

(Soldering 4 Sec) +260˚C

Package Thermal Resistance

θ

8-pin SOIC

JA

8-pin SOIC

θ

JC

+0.3V

CC

+125˚C/W
+105˚C/W

ESD Rating (HBM) 5kV

ESD Rating (MM) 250V

Recommended Operating
Conditions

Supply Voltage (VCC–VEE): 3.3V±5%

Operating Free Air Temperature (T

LMH0002MA
LMH0002TMA

)

A

0˚C to +70˚C

−40˚C to +85˚C

DC Electrical Characteristics

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

Symbol Parameter Conditions Reference Min Typ Max Units

V

CMIN

V

SDI

V

CMOUT

V

SDO

I

CC

Input Common Mode Voltage SDI, SDI 1.6 +

/2

V

SDI

Input Voltage Swing Differential 100 2000 mV

Output Common Mode Voltage SDO, SDO VCC–

V

SDO

Output Voltage Swing Single-ended, 75Ω load,

= 750Ω 1%

R

REF

Single-ended, 75Ω load,

= 590Ω 1%

R

REF

750 800 850 mV

900 1000 1100 mV

SD/HD Input Voltage Min for SD SD/HD 2.4 V

Max for HD 0.8 V

SD/HD Input Current

3.7 µA

Supply Current SD/HD = 0, (Note 5) 45 49 mA

SD/HD = 1, (Note 5)

38 43 mA

V

–

CC

/2

V

SDI

V

P−P

V

P-P

P-P

AC Electrical Characteristics

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

Symbol Parameter Conditions Reference Min Typ Max Units

DR

t

jit

tr,t

t

OS

RL

Input Data Rate (Note 4) SDI, SDI 1485 Mbps

SDI

Additive Jitter 1.485 Gbps SDO, SDO 26 ps

270 Mbps 18 ps

Output Rise Time, Fall Time SD/HD = 0, 20% – 80%,

f

(Note 6)

SD/HD = 1, 20% – 80%

400 560 800 ps

120 220 ps

P-P

P-P

Mismatch in Rise/Fall Time (Note 4) 30 ps

Output Overshoot (Note 4) 8 %

Output Return Loss (Note 7) 15 20 dB

SDO

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 V

Note 3: Typical values are stated for V

Note 4: Specification is guaranteed by characterization.

Note 5: Maximum I

Note 6: Specification is guaranteed by characterization and verified by test.

Note 7: Output return loss is dependent on board design. The LMH0002 meets this specification on the SD002 evaluation board from 5MHz to 1.5GHz.

is measured at VCC= +3.465V and TA= +70˚C.

CC

= +3.3V and TA= +25˚C.

CC

= 0 Volts.

EE

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Connection Diagram

LMH0002

Order Number LMH0002MA or LMH0002TMA

See NS Package Number M08A

Pin Descriptions

Pin # Name Description

1 SDI Serial data true input.

2 SDI

3V

4R

5V

EE

REF

CC

6 SD/HD

Serial data complement input.

Negative power supply (ground).

Output driver level control. Connect a resistor to VCCto set output voltage swing.

Positive power supply (+3.3V).

Output slew rate control. Output rise/fall time complies with SMPTE 292M when low and
SMPTE 259M when high.

7 SDO Serial data complement output.

8 SDO Serial data true output.

Device Operation

INPUT INTERFACING

The LMH0002 accepts either differential or single-ended
input. The inputs are self-biased, allowing for simple AC or
DC coupling. DC-coupled inputs must be kept within the
specified common-mode range. SDI and SDI are self-biased
at approximately 2.1V with VCC= 3.3V. Figure 1 shows the
differential input stage for SDI and SDI.

8-Pin SOIC

20176101

20176104

FIGURE 1. Differential Input Stage for SDI and SDI.

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Device Operation (Continued)

OUTPUT INTERFACING

LMH0002

The LMH0002 uses current mode outputs. Single-ended
output levels are 800 mV
cable (with R
value of the R

The R

REF

the R

REF

below the R

= 750Ω). Output level is controlled by the

REF

resistor connected between pin 4 and VCC.

REF

resistor should be placed as close as possible to
pin. In addition, the copper in the plane layers

network should be removed to minimize

REF

parasitic capacitance.

into 75Ω AC-coupled coaxial

P-P

OUTPUT SLEW RATE CONTROL

The LMH0002 output rise and fall times are selectable for
either SMPTE 259M or SMPTE 292M compliance via pin 6,
SD/HD. For slower rise and fall times, or SMPTE 259M
compliance, SD/HD is set high. For faster rise and fall times,
or SMPTE 292M compliance, SD/HD is set low.

REPLACING THE GENNUM GS1528

The LMH0002 is form-fit-function compatible with the Gen­num GS1528 and GS1528A.

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Physical Dimensions inches (millimeters) unless otherwise noted

8-Pin SOIC

Order Number LMH0002MA or LMH0002TMA

NS Package Number M08A

LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.

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

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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:

1. Life support devices or systems are devices or systems
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

2. A critical component is any component of 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.

provided in the labeling, can be reasonably expected to result
in a significant injury to the user.

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National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain
no ‘‘Banned Substances’’ as defined in CSP-9-111S2.

Leadfree products are RoHS compliant.

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