1 Features

• Adaptive cable equalizer with integrated reclocker

• 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 referenceless reclocker locks to

SMPTE rates: 11.88Gbps, 5.94Gbps, 2.97Gbps,

1.485Gbps, or divide-by-1.001 sub-rates, 270Mbps

• Typical cable reach (Belden 1694A):

– 100m at 11.88Gbps (4Kp60 UHD)

– 150m at 5.94Gbps (UHD)

– 220m at 2.97Gbps (FHD)

– 300m at 1.485Gbps (HD)

– 600m at 270Mbps (SD) (Under Evaluation)

• On-chip 75Ω termination and return loss

compensation network

• Input cable equalizer and reclocker features:

– Improved cable reach with stress patterns

– Programmable CDR loop bandwidth settings

– 2:1 75Ω input mux (LMH1239 only)

• Output driver features:

– 1:2 100Ω fanout output with de-emphasis

– Reclocked 75Ω loop-through output with cable

fault detection (up to 600m)

• Built-in PRBS generator, checker, and pathological

pattern detector

• Internal eye opening monitor

• Single 2.5V supply

• Low power: 375 mW (typical)

• Power Save mode: 63 mW

• Configurable by control pins, SPI, or SMBus

interface

• 5mm × 5mm 32-pin WQFN package

• Operating temperature range: –40°C to +85°C

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

The LMH12x9 (LMH1229, LMH1239) is a long reach

adaptive cable equalizer with integrated reclocker,

dual outputs, and 75Ω loop-through output. The

device is designed to equalize data transmitted over

75Ω coaxial cable and operates across SMPTE data

rates ranging from 125Mbps to 11.88Gbps.

The adaptive equalizer at the SDI input enables

automatic loss compensation for up to 100m Belden

1694A cable reach in 4K/8K video applications

where 12G-SDI (11.88Gbps) is used. The integrated

reclocker attenuates high frequency jitter and fully

regenerates the data using a clean, low-jitter

clock. The loop filter of the reclocker is adjustable

with optional external capacitor for SDI cascade

applications.

For routing simplicity and debug, the LMH12x9

features a 1:3 output mux consisting of two 100Ω

fanouts with VOD and de-emphasis control and one

75Ω loop-through SDI output. The 75Ω loop-through

output is provided to extend the signal reach or

enable system-level diagnostics.