LMH1218

(ACTIVE) 12G-SDI Cable Driver with Integrated Reclocker

Diagram

Functional Diagram

Simplified SPI Schematic

Description

The LMH1218 device is a low-power cable driver with integrated reclocker to drive serial video data compatible to SMPTE-SDI, SMPTE 2022-5/6, 10GbE Ethernet, and DVB-ASI standards. The LMH1218 supports up to 11.88 Gbps to enable Ultra High Definition Video for 4K/8K applications. With 75-Ω and 50-Ω transmitter outputs, the LMH1218 enables multiple media options such as coax, fiber, and FR-4 PCB.

The integrated 2-to-1 MUX on the input of the LMH1218 enables selection between two video sources, while the programmable equalizer compensates for the printed-circuit board loss to extend signal reach. With a wide range clock-and-data recovery (CDR) circuit, the on-chip reclocker automatically detects and locks to serial data from 270 Mbps to 11.88 Gbps without the need for an external reference clock and loop filter component, thereby simplifying board design and lowering system cost. The reclocked serial data can be routed to either the 75-Ω or 50-Ω transmitter output, or both simultaneously (1-to-2 fanout mode). The output voltage swing is compatible to SFF-8431 (SFP+), ST-2082/1 (Proposed), SMPTE 424M, 344M, 292M, and 259M standards.

A non-disruptive eye monitor allows for real-time measurement of serial data to simplify system start-up or field tuning. The LMH1218 can be programmed using SPI or SMBus Interface.

Features

  • Supports ST-2082 (Proposed), ST-2081 (Proposed), SMPTE 424M, 344M, 292M, 259M, DVB-ASI, SFF-8431 (SFP+) and 10GbE Ethernet for SMPTE 2022-5/6
  • Locks to Rates 11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps, or Divided by 1.001 Sub-Rates, DVB-ASI (270 Mbps) and 10GbE (10.3125 Gbps)
  • Reference-Free Operation With Fast Lock Time Covering All Supported or Selected Data Rates
  • 75-Ω and 100-Ω Transmitter Outputs
  • Integrated 2:1 Mux Input, 1:2 Demux/Fanout Outputs
  • Automatic Slew Rate Based on Input Rate Detect
  • On-Chip Eye Monitor
  • Low 300-mW Power Consumption With Automatic Power Down on Loss of Input Signal
  • Programmable Through SPI or SMBus Interface
  • Single 2.5-V Supply Operation
  • Small 4-mm × 4-mm 24-Pin WQFN Package
  • –40°C to +85°C Operating Temperature Range

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Parametrics

Function Cable driver^Cable driver with reclocker^Reclocker    
Supply Voltage (V) 2.5    
ESD HBM (kV) 2.5    
Data rate (Max) (Mbps) 11880    
In/out count 2/2    
Operating temperature range (C) -40 to 85    
Package Group WQFN|24    
Package size: mm2:W x L (PKG) 24WQFN: 16 mm2: 4 x 4 (WQFN|24)    

Companion Products

Technical Documents

Datasheet (1)

Application notes (2)

User guides (2)

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