LMH0395 Datasheet, PDF (1/21 Pages) Texas Instruments – 3G HD/SD SDI Dual Output Low Power Extended Reach Adaptive Cable Equalizer

LMH0395
April 4, 2012
3G HD/SD SDI Dual Output Low Power Extended Reach
Adaptive Cable Equalizer
General Description
The LMH0395 3 Gbps HD/SD SDI Dual Output Low Power
Extended Reach Adaptive Cable Equalizer is designed to
equalize data transmitted over cable (or any media with sim-
ilar 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.
The LMH0395 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 LMH0395 offers power man-
agement to further reduce power consumption when no input
signal is present.
The LMH0395 has two differential serial data outputs, in-
creasing flexibility and eliminating the need for a fanout buffer
on the output in many applications. The outputs may be in-
dependently enabled and controlled. The output drivers offer
programmable de-emphasis for up to 40” of FR4 trace losses.
The LMH0395 supports two modes of operation. In pin mode,
the LMH0395 operates with control pins to set its operating
state. In SPI mode, an optional SPI serial interface can be
used to access and configure multiple LMH0395 devices in a
daisy-chain configuration. This allows programming the out-
put common mode voltage and swing, output de-emphasis
level, input launch amplitude, and power management set-
tings, as well as access to a cable length indicator and all pin
mode features.
Features
■ ^{SMPTE 424M, SMPTE 292M, SMPTE 344M, SMPTE}
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
■ ^{Ultra low power consumption: 140 mW (dual outputs),}
115 mW (single output)
■ ^{Dual differential outputs; second output can be}
independently powered down
■ ^{Power save mode with auto sleep control (17 mW typical}
power consumption in power save mode)
■ ^{Designed for crosstalk immunity}
■ ^{Output de-emphasis to compensate for FR4 board trace}
losses
■ ^{Digital and analog programmable MUTE}_REF ^threshold
■ ^{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}
■ ^{Single 2.5V supply operation}
■ ^{24-pin LLP package}
■ ^{Industrial temperature range: −40°C to +85°C}
Applications
■ ^{SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE}
259M serial digital interfaces
■ ^{Broadcast Video routers, switchers, and distribution}
amplifiers
Typical Application (Pin Mode)
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