LMH1228 LMH1228 12G UHD-SDI Dual Cable Driver with Integrated Reclocker | TI.com

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LMH1228 12G UHD-SDI Dual Cable Driver with Integrated Reclocker


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LMH1228 device is a 12G UHD-SDI low power dual output cable driver with integrated reclocker. It supports SMPTE video rates up to 11.88 Gbps, enabling UHD video for 4K/8K applications. With a wide range clock-and-data recovery (CDR) circuit, the on-chip reclocker automatically detects and locks to all SMPTE video rates up to 11.88 Gbps. The additional reclocked 100-Ω driver output on the host-side can be used for monitoring or signal distribution purposes.

The on-chip reclocker attenuates high-frequency jitter and fully regenerates the data using a clean, low-jitter clock. The reclocker has a built-in loop filter and does not require any input reference clock. The LMH1228 also has an internal eye opening monitor and a programmable pin for CDR lock indication, input signal detect, or hardware interrupts to support system diagnostics and board bring-up.

The LMH1228 is powered from a single 2.5-V supply. It is offered in a small footprint 5 mm × 5 mm 32-pin WQFN package. The LMH1228 is pin compatible with the LMH1208 (12G Dual Cable Driver).


  • Supports ST-2082-1 (12G), ST-2081-1 (6G), ST-424 (3G), ST-292 (HD), and ST-259 (SD)
  • Compatible with DVB-ASI and AES10 (MADI)
  • Integrated reclocker locks to SMPTE rates of 11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps or divide-by-1.001 sub-rates and 270 Mbps
  • Integrated Eye Opening Monitor (EOM)
  • Dual differential output cable drivers
  • On-chip 75-Ω termination and return loss compensation network
  • Adaptive PCB input equalizer
  • Reclocked 100-Ω loop-back output
  • Automatic slew rate control on 75-Ω outputs
  • Automatic pre-emphasis and output amplitude on 75-Ω outputs
  • Programmable de-emphasis and output amplitude on 100-Ω output
  • Polarity inversion on 75-Ω and 100-Ω outputs
  • Automatic power save in absence of input signal
    • Power Consumption: 25 mW (Typical)
  • Power-Down Control Through ENABLE Pin
  • Single 2.5-V Supply
    • Power consumption: 305 mW (typical)
  • Programmable through pins, SPI, or SMBus interface
  • –40°C to +85°C operating temperature range
  • 5-mm × 5-mm, 32-pin WQFN package

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Part number Order Function Data rate (Max) (Gbps) Power consumption (mW) Control interface Package Group Package size: mm2:W x L (PKG) Operating temperature range (C)
LMH1228 Order now Cable driver
Cable driver with reclocker    
11.88     315     Pin
WQFN | 32     32WQFN: 25 mm2: 5 x 5 (WQFN | 32)     -40 to 85    
LMH1208 Order now Cable driver     11.88     255     Pin
WQFN | 32     32WQFN: 25 mm2: 5 x 5 (WQFN | 32)     -40 to 85