March 15, 2012
LMH0394
3G HD/SD SDI Low Power Extended Reach Adaptive Cable
Equalizer
General Description
Features
The LMH0394 3 Gbps HD/SD SDI Low Power Extended
Reach Adaptive Cable Equalizer is designed to equalize data
transmitted over cable (or any media with similar dispersive
loss characteristics). The equalizer operates over a wide
range of data rates from 125 Mbps to 2.97 Gbps and supports
SMPTE 424M, SMPTE 292M, SMPTE 344M, SMPTE 259M,
and DVB-ASI standards.
SMPTE 424M, SMPTE 292M, SMPTE 344M, SMPTE
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259M, and DVB-ASI compliant
Equalized cable lengths (Belden 1694A): 200m at 2.97
Gbps, 220m at 1.485 Gbps, and 400m at 270 Mbps
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Ultra low power consumption: 115 mW (normal operation)
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Power save mode with auto sleep control (17 mW typical
power consumption in power save mode)
The LMH0394 provides extended cable reach with improved
immunity to crosstalk and ultra low power consumption. The
equalizer includes active sensing circuitry that ensures robust
performance and enhanced immunity to variations in the input
signal launch amplitude. The output driver offers pro-
grammable de-emphasis for up to 40” of FR4 trace losses.
The LMH0394 includes power management to further reduce
power consumption when no input signal is present.
Designed for crosstalk immunity
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Output de-emphasis to compensate for FR4 board trace
losses
Digital and analog programmable MUTEREF threshold
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Optional SPI register access
Input data rates: 125 Mbps to 2.97 Gbps
Internally terminated 100Ω LVDS outputs with
programmable output common mode voltage and swing
Programmable launch amplitude optimization
Cable length indicator
The LMH0394 supports two modes of operation. In pin mode,
the LMH0394 operates with control pins to set its operating
state, and is footprint compatible with the LMH0384,
LMH0344, and legacy SDI equalizers. In SPI mode, an op-
tional SPI serial interface can be used to access and configure
multiple LMH0394 devices in a daisy-chain configuration.
This allows programming the output common mode voltage
and swing, output de-emphasis level, input launch amplitude,
and power management settings, as well as access to a cable
length indicator and all pin mode features.
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Single 2.5V supply operation
16-pin LLP package
Industrial temperature range: −40°C to +85°C
Footprint compatible with the LMH0384 and also the
LMH0344, LMH0044, and LMH0074 in pin mode.
Applications
SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
259M serial digital interfaces
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Broadcast Video routers, switchers, and distribution
amplifiers
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Typical Application (Pin Mode)
30101501
© 2012 Texas Instruments Incorporated
301015 SNLS312K
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