Datasheet LMH0302 Datasheet (National Semiconductor)

LMH0302
3Gbps HD/SD SDI Cable Driver

LMH0302 3Gbps HD/SD SDI Cable Driver

August 1, 2008

General Description

The LMH0302 3Gbps HD/SD SDI Cable Driver is designed
for use in SMPTE 424M, SMPTE 292M, SMPTE 344M, and
SMPTE 259M serial digital video applications. The LMH0302
drives 75Ω transmission lines (Belden 1694A, Belden 8281,
or equivalent) at data rates up to 2.97 Gbps.

The LMH0302 provides two selectable slew rates for SMPTE
259M and SMPTE 424M / 292M compliance. The output driv­er may be powered down via the output driver enable pin.

The LMH0302 is powered from a single 3.3V supply. Power
consumption is typically 125 mW in SD mode and 165 mW in
HD mode. The LMH0302 is available in a 16-pin LLP pack­age.

Typical Application

Features

SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE

■

259M compliant
Data rates to 2.97 Gbps

■

Supports DVB-ASI at 270 Mbps

■

Differential input

■

75Ω differential output

■

Selectable slew rate

■

Output driver power down control

■

Single 3.3V supply operation

■

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

■

Typical power consumption: 125 mW in SD mode and

■

165 mW in HD mode
16–pin LLP package

■

Footprint compatible with the LMH0002SQ

■

Replaces the Gennum GS2978

■

Applications

SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE

■

259M serial digital interfaces
Digital video routers and switches

■

Distribution amplifiers

■

20214602

© 2008 National Semiconductor Corporation 202146 www.national.com

Absolute Maximum Ratings (Note 1)

Supply Voltage: −0.5V to 3.6V

LMH0302

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

Output Current 28mA
Storage Temperature Range −65°C to +150°C
Junction Temperature +125°C
Lead Temperature

(Soldering 4 Sec) +260°C

ESD Rating (HBM) 4.5 kV
ESD Rating (MM) 250V
ESD Rating (CDM) 2 kV

Recommended Operating Conditions

Supply Voltage (VCC – VEE): 3.3V ±5%

Operating Free Air Temperature (TA)

−40°C to +85°C

Package Thermal Resistance

θJA 16-pin LLP
 θJC 16-pin LLP

+64°C/W
+26°C/W

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

V

IH

V

IL

I

CC

Input Common Mode Voltage SDI, SDI

Input Voltage Swing Differential

Output Common Mode Voltage SDO, SDO

Output Voltage Swing

Single-ended, 75Ω load,

R

= 750Ω 1%

REF

Input Voltage High Level SD/HD,

InputVoltage Low Level

Supply Current SD/HD = 0,

ENABLE

SDO/SDO enabled

SD/HD = 0,
SDO/SDO disabled

SD/HD = 1,
SDO/SDO enabled

SD/HD = 1,
SDO/SDO disabled

1.1 +

V

SDI

/2

VCC –

V

/2

SDI

100 2200

VCC –

V

SDO

V

720 800 880

2.0 V

0.8 V

50 59 mA

26 33 mA

38 48 mA

15 22 mA

mV

mV

V

P−P

P-P

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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

Mismatch in Rise/Fall Time SD/HD = 0 30 ps

Duty Cycle Distortion SD/HD = 0, 2.97 Gbps, (Note

t

OS

RL

Input Data Rate SDI, SDI

SDI

Additive Jitter 2.97 Gbps SDO, SDO

1.485 Gbps

270 Mbps

Output Rise Time, Fall Time SD/HD = 0, 20% – 80%, 90 130 ps

f

2970 Mbps

20

18

15

SD/HD = 1, 20% – 80% 400 800 ps

SD/HD = 1 50 ps

4)

SD/HD = 0, 1.485 Gbps, (Note

4)

27 ps

30 ps

SD/HD = 1, (Note 4) 100 ps

Output Overshoot SD/HD = 0, (Note 4) 10 %

SD/HD = 1, (Note 4) 8 %

Output Return Loss 5 MHz - 1.5 GHz, (Note 5) 15 dB

SDO

1.5 GHz - 3.0 GHz, (Note 5) 10 dB

ps

ps

ps

P-P

P-P

P-P

LMH0302

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: Output return loss is dependent on board design. The LMH0302 meets this specification on the SD302 evaluation board.

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Connection Diagram

LMH0302

The exposed die attach pad is a negative electrical terminal for this device. It should be connected to the negative power supply voltage.

20214605

16-Pin LLP

Order Number LMH0302SQ

See NS Package Number SQB16A

Pin Descriptions

Pin Name Description

1 SDI Serial data true input.

2 SDI Serial data complement input.

3 V

4 R

EE

REF

5 NC No connect. Not bonded internally.

6 ENABLE Output driver enable. When low, the SDO/SDO output driver is powered off. ENABLE has an

7 NC No connect. Not bonded internally.

8 NC No connect. Not bonded internally.

9 V

CC

10 SD/HD Output slew rate control. Output rise/fall time complies with SMPTE 424M / 292M when low and

11 SDO Serial data complement output.

12 SDO Serial data true output.

13 NC No connect. Not bonded internally.

14 NC No connect. Not bonded internally.

15 NC No connect. Not bonded internally.

16 NC No connect. Not bonded internally.

DAP V

EE

Negative power supply (ground).

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

internal pulllup.

Positive power supply (+3.3V).

SMPTE 259M when high.

Connect exposed DAP to negative power supply (ground).

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LMH0302

Device Operation

INPUT INTERFACING

The LMH0302 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.

OUTPUT INTERFACING

The LMH0302 uses current mode outputs. Single-ended out­put levels are 800 mV
with an R
between the R
should be used for R

The R
the R

resistor of 750Ω. The R

REF

REF

resistor should be placed as close as possible to

REF

pin. In addition, the copper in the plane layers below

REF

into 75Ω AC-coupled coaxial cable

P-P

pin and VCC. The only resistor value that

is 750Ω..

REF

resistor is connected

REF

the R
capacitance.

network should be removed to minimize parasitic

REF

OUTPUT SLEW RATE CONTROL

The LMH0302 output rise and fall times are selectable for ei­ther SMPTE 259M or SMPTE 424M / 292M compliance via
the SD/HD pin. For slower rise and fall times, or SMPTE 259M
compliance, SD/HD is set high. For faster rise and fall times,
or SMPTE 424M and SMPTE 292M compliance, SD/HD is
set low.

OUTPUT ENABLE

The SDO/SDO output driver can be enabled or disabled with
the ENABLE pin. When set low, the output driver is powered
off. ENABLE has an internal pullup.

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Physical Dimensions inches (millimeters) unless otherwise noted

LMH0302

Order Number LMH0302SQ

NS Package Number SQB16A

16-Pin LLP

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Notes

LMH0302

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Notes

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LMH0302 3Gbps HD/SD SDI Cable Driver

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

Temperature Sensors www.national.com/tempsensors

Wireless (PLL/VCO) www.national.com/wireless

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