Texas Instruments LMH1239 Bedienungsanleitung

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LMH12x9 12G UHD Long Reach Cable Equalizer with Integrated Reclocker

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), PRBS-9

pattern:

–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)

•Typical cable reach (Belden 1694A), pathological

pattern

1

:

–90m at 11.88Gbps (4Kp60 UHD)

–140m at 5.94Gbps (UHD)

–220m at 2.97Gbps (FHD)

–300m at 1.485Gbps (HD)

–600m at 270Mbps (SD)

•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 and checker

•Internal eye opening monitor

•Single 2.5V supply

•Low power: 350mW (typical)

•Power Save mode: 70mW

•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 to reduce the CDR loop

bandwidth.

Device Information

PART

NUMBER

2:1 75Ω INPUT MUX

INCLUDED?

PACKAGE

(1)

PACKAGE

SIZE

(2)

LMH1229No

RTV (QFN, 32)5mm x 5mm

LMH1239Yes

(1)For more information, see Section 10.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

Cable

EQ

SDI_IN+

75-



Term

RL Network

2:1 Input Mux*

Cable

EQ

SDI_IN1+

(LMH1239 only)

75-



Term

RL Network

Output Mux

CDR

+

DFE

100



Driver

100



Driver

Cable

Driver

75-



Term

RL Network

SDI_OUT+

OUT0±

OUT1±

*2:1 Input mux is only applicable with the LMH1239 variant. For LMH1229, SDI_IN+

data path is routed directly to the CDR.

Simplified Block Diagram

1

For details about SDI pathological implementation, refer to A Study of the SDI Pathological Data Pattern application note

LMH1229, LMH1239

SNOSDC1A – JUNE 2024 – REVISED OCTOBER 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspezifikationen