1 Features

1• 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

2 Applications

• SMPTE compatible serial digital interface

• UHDTV/4K/8K/HDTV/SDTV video

• Broadcast video routers, switchers, distribution

amplifiers, and monitors

• Digital video processing and editing

3 Description

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 hostside

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).