LMH0303 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – 3 Gbps HD/SD SDI Cable Driver with Cable Detect

PRELIMINARY
July 10, 2008
LMH0303
3 Gbps HD/SD SDI Cable Driver with Cable Detect
General Description
The LMH0303 3 Gbps HD/SD SDI Cable Driver with Cable
Detect is designed for use in SMPTE 424M, SMPTE 292M,
SMPTE 344M, and SMPTE 259M serial digital video appli-
cations. The LMH0303 drives 75Ω transmission lines (Belden
1694A, Belden 8281, or equivalent) at data rates up to 2.97
Gbps.
The LMH0303 includes intelligent sensing capabilities to im-
prove system diagnostics. The cable detect feature senses
near-end termination to determine if a cable is correctly at-
tached to the output BNC. Input loss of signal (LOS) detects
the presence of a valid signal at the input of the cable driver.
These sensing features may be used to alert the user of a
system fault and activate a deep power save mode, reducing
the cable driver's power consumption to 3 mW. These fea-
tures are accessible via an SMBus interface.
The LMH0303 provides two selectable slew rates for SMPTE
259M and SMPTE 424M / 292M compliance. The output am-
plitude is adjustable ±10% in 5 mV steps via the SMBus.
The LMH0303 is powered from a single 3.3V supply. Power
consumption is typically 130 mW in SD mode and 155 mW in
HD mode. The LMH0303 is available in a 16-pin LLP pack-
age.
The LMH0303 interfaces with National's LMH0356 for addi-
tional system control and power consumption savings (see
Typical Application).
Features
■ ^{SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE}
259M compliant
■ ^{Data rates to 2.97 Gbps}
■ ^{Cable detect on output}
■ ^{Loss of signal detect at input}
■ ^{Output driver power down control}
■ ^{Typical power consumption: 130 mW in SD mode and}
155 mW in HD mode
■ ^{Power save mode typical power consumption: 4 mW}
■ ^{Single 3.3V supply operation}
■ ^{Differential input}
■ 75Ω differential output
■ ^{Selectable slew rate}
■ ^{Industrial temperature range: −40°C to +85°C}
■ ^{16–pin LLP package}
■ ^{Footprint compatible with the LMH0302}
Applications
■ ^{SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE}
259M serial digital interfaces
■ ^{Digital video routers and switches}
■ ^{Distribution amplifiers}
Typical Application
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