LMH0394_15 Datasheet, PDF (1/35 Pages) Texas Instruments – 3G HD/SD SDI Low Power Extended Reach Adaptive Cable Equalizer

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LMH0394
SNLS312M – AUGUST 2010 – REVISED JULY 2015
LMH0394 3G HD/SD SDI Low Power Extended Reach Adaptive Cable Equalizer
1 Features
•1 ST 424, ST 292, ST 344, ST 259, and DVB-ASI
Compliant ⁽¹⁾
• Equalized Cable Lengths (Belden 1694A): 200
Meters at 2.97 Gbps, 220 Meters at 1.485 Gbps,
and 400 Meters at 270 Mbps
• Ultra Low Power Consumption: 115 mW (Normal
Operation)
• 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 100-Ω LVDS Outputs With
Programmable Output Common-Mode Voltage
and Swing
• Programmable Launch Amplitude Optimization
• Cable Length Indicator
• Single 2.5-V Supply Operation
• 16-pin WQFN Package
• Industrial Temperature Range: −40°C to +85°C
• Footprint Compatible with the LMH0384 and also
the LMH0344, LMH0044, and LMH0074 in Pin
Mode
2 Applications
• ST 424, ST 292, ST 344, and ST 259 Serial
Digital Interfaces⁽¹⁾
• Broadcast Video Routers, Switchers, and
Distribution Amplifiers
3 Description
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 ST 424, ST 292, ST 344, ST 259, and DVB-
ASI standards⁽¹⁾.
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
programmable 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.
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 optional SPI serial interface can be
used to access and configure multiple LMH0394
devices in a daisy-chain configuration. This allows
users to program the output common-mode voltage
and swing, output de-emphasis level, input launch
amplitude, and power management settings. Users
may also access a cable length indicator and all pin
mode features.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMH0394
WQFN (16)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Functional Block Diagram
SDI
SDI
Equalizer
Filter
DC
Restoration/
Level Control
Output
Driver
BYPASS
SDO
SDO
(1) Due to SMPTE naming convention, all SMPTE Engineering
Documents will be numbered as a two-letter prefix and a
number. Documents and references with the same root
number and year are functionally identical; for example ST
424-2006 and SMPTE 424M-2006 refer to the same
document.
1
CD
Carrier
Detect
Energy
Detect
Energy
Detect
MUTEREF
$
MUTEREF
Automatic
Equalization
Control
AEC+ AEC-
AUTO SLEEP
De-Emphasis
Control
SPI Control
MUTE
SPI_EN
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.