LMH0318_15 Datasheet, PDF (13/57 Pages) Texas Instruments – LMH0318 3 Gbps HD/SD SDI Reclocker with Integrated Cable Driver

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8 Detailed Description
LMH0318
SNLS508 – SEPTEMBER 2015
8.1 Overview
The LMH0318 is a 2.97Gbps/1.485Gbps/0.27Gbps multi-rate serial digital video data reclocker with integrated
cable driver intended for equalizing, reclocking, and driving data compatible to the SMPTE standards. It is a 2-
input, 2-output single-core chip, enabling 1:2 fan-out or 2:1 MUX operations. Each input has a 100 Ω continuous
time linear equalizer (CTLE) at the front-end, intended to compensate for loss over STP coax or FR-4 PCB trace.
The LMH0318 OUT0 is a 75 Ω cable driver compatible to the SMPTE requirements.
The referenceless Clock-and-Data Recovery (CDR) circuit selects between the two inputs based on user choice.
The reclocked output can be driven to one or two outputs. One of the outputs supports 100-Ω differential cable
connection, while the other output can drive a 75 Ω SMPTE specified cable while meeting transmitter
requirements as specified in SMPTE standard. The LMH0318 locks to all required SDI data rates, including
270Mbps, 1.485 Gbps, 1.4835 Gbps, 2.97 Gbps, and 2.967 Gbps. The LMH0318 is assembled in a 4 mm × 4
mm 24-pin QFN package. The chip can be programmed using SPI or SMBus interface.
8.2 Functional Block Diagram
100 
FPGA/Cross Point

100 
FPGA/Cross Point ^
Loss Of
Signal
FR4 EQ
FR4 EQ
Loss Of
Signal
LA
Eye
Monitor
CDR
VCO
Mux Control
Mute
OUT0(75 )
75 BNC
Raw
Retimed
Clock
Mute
OUT1(100 )
100 Data or Clock
Polarity Control
Control Logic Block
Status
Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: LMH0318
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