1 Features

1• User-configurable adaptive cable equalizer or

cable driver with integrated reclocker

• Supports ST-424 (3G), ST-292 (HD), and ST-259

(SD)

• Compatible with DVB-ASI and AES10 (MADI)

• Integrated reclocker locks to SMPTE rates of 2.97

Gbps, 1.485 Gbps, or divide-by-1.001 subrates

and 270 Mbps

• On-Chip 75-Ω termination and return loss

compensation network

• EQ (equalizer) mode:

– Adaptive cable equalizer with integrated

reclocker

– 100-Ω Output driver with de-emphasis

– Reclocked 75-Ω loop-through output

– EQ mode cable reach

(Belden 1694A, SDI_OUT Disabled):

– 200 m at 2.97 Gbps

– 300 m at 1.485 Gbps

– 600 m at 270 Mbps

• CD (cable driver) mode:

– Dual differential output cable drivers with

integrated reclocker

– Adaptive PCB input equalizer

– Reclocked 100-Ω loopback output

• Automatic pre-emphasis and slew rate control on

75-Ω outputs

• Polarity inversion on 75-Ω and 100-Ω outputs

• Automatic power save in absence of input signal

– Power dissipation: 25 mW (typical)

• Power-down control through ENABLE pin

• Single 2.5-V supply

– EQ mode power dissipation: 275 mW (typical)

– CD mode power dissipation: 290 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

• Pin compatible with the LMH1297 for easy

upgrade to 12G-SDI

2 Applications

• SMPTE compatible serial digital interface

• UHDTV/4K/8K/HDTV/SDTV video

• IP media gateway

• Digital video processing and editing

3 Description

The LMH0397 is a 3G-SDI 75-Ω bidirectional I/O with

integrated reclocker. This device can be configured

either in input mode as an adaptive cable equalizer or

in output mode as a dual cable driver, allowing

system designers the flexibility to use a single BNC

either as an input or output port to simplify HD-SDI

video hardware designs. The integrated reclocker

locks to all supported SMPTE data rates up to 2.97

Gbps in both modes. The bidirectional I/O has an onchip

75-Ω termination and return loss compensation

network that meets the stringent SMPTE return loss

requirements.

An additional 75-Ω driver output allows the LMH0397

to support a variety of system functions. In EQ

(Equalizer) Mode, this second 75-Ω driver can be

used as a loop-through output. In Cable Driver (CD)

Mode, this 75-Ω driver can be used as a second fanout

cable driver. The host-side 100-Ω driver can also

be used as a loopback output in CD Mode for

monitoring purposes.