National Semiconductor LMH0034 Technical data

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LMH0034
SMPTE 292M / 259M Adaptive Cable Equalizer

LMH0034 SMPTE 292M / 259M Adaptive Cable Equalizer

PRELIMINARY

January 2006

General Description

The LMH0034 SMPTE 292M / 259M adaptive cable equal­izer is a monolithic integrated circuit for equalizing data
transmitted over cable (or any media with similar dispersive
loss characteristics). The equalizer operates over a wide
range of data rates from 143 Mbps to 1.485 Gbps and
supports SMPTE 292M, SMPTE 344M and SMPTE 259M.

The LMH0034 implements DC restoration to correctly handle
pathological data conditions. DC restoration can be by­passed for low data rate applications. The equalizer is flex­ible in allowing either single-ended or differential input drive.

Additional features include a combined carrier detect and
output mute pin which mutes the output when no signal is
present. A programmable mute reference is used to mute the
output at a selectable level of signal degradation. A cable
length indicator is provided to determine the amount of cable
being equalized.

Typical Application

Features

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

compliant

n Supports DVB-ASI at 270 Mbps
n High data rates: 143 Mbps to 1.485 Gbps
n Equalizes up to 140 meters of Belden 1694A at 1.485

Gbps or up to 350 meters of Belden 1694A at 270 Mbps

n Manual bypass, cable length indicator, and output mute

with a programmable threshold

n Single-ended or differential input
n 50Ω differential outputs
n Single 3.3V supply operation
n 208mW typical power consumption with 3.3V supply
n Replaces the GS1524 and GS1524A

Applications

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

digital interfaces

n Serial digital data equalization and reception
n Data recovery equalization

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Absolute Maximum Ratings (Note 1)

Supply Voltage −0.5V to 3.6V

LMH0034

Input Voltage (all inputs) −0.3V to V

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

Junction Temperature +150˚C

Lead Temperature

(Soldering 4 Sec) +260˚C

CC

+0.3V

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 (T

) 0˚C to +85˚C

A

Package Thermal Resistance

θ

16-pin SOIC

JA

16-pin SOIC

θ

JC

+115˚C/W
+105˚C/W

ESD Rating (HBM) 8kV

ESD Rating (MM) 250V

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 1.9 V

Input Voltage Swing At LMH0034 input, (Notes 4, 6) 720 800 950 mV

Output Common Mode Voltage SDO, SDO VCC–

/2

V

SDO

Output Voltage Swing 50Ω load, differential 750 mV

CLI DC Voltage 0m cable CLI 2.5 V

Max cable 1.6 V

MUTE

MUTE

CD/MUTE Output Voltage

DC Voltage (floating) MUTE

REF

Range 0.7 V

REF

REF

1.3 V

Carrier not present CD/MUTE 2.6 V

Carrier present 0.4 V

CD/MUTE Input Voltage

Min to mute outputs 3.0 V

Max to force outputs active 2.0 V

Supply Current (Note 7) 63 77 mA

P−P

V

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

BR

t

r,tf

t

OS

R

RL

R

C

OUT

IN

IN

Input Data Rate SDI, SDI 143 1485 Mbps

SDI

Maximum Equalized Cable
Length (with equalizer
pathological)

270 Mbps, Belden 1694A,

0.2UI output jitter, (Note 4)

270 Mbps, Belden 8281,

0.2UI output jitter, (Note 4)

1.485 Gbps, Belden 1694A,

0.25UI output jitter, (Note 4)

1.485 Gbps, Belden 8281,

0.25UI output jitter, (Note 4)

350 m

280 m

140 m

100 m

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

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

Output Overshoot (Note 4) 1 5 %

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

Input Return Loss (Note 8) SDI, SDI 15 18-20 dB

IN

Input Resistance single-ended 1.3 kΩ

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 V

Note 3: Typical values are stated for V

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: 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 Figures 1, 2.

Note 8: Input return loss is dependent on board design. The LMH0034 meets this specification on the SD034 evaluation board from 5MHz to 1.5GHz.

= +3.3V and TA= +25˚C.

CC

= 0 Volts.

EE

LMH0034

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