LMH1228RTVT

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).

Key Features

• 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