Coaxial Cable

75:

37.4:

75:

3.9 nH

1.0 PF

1.0 PF

LMH0344 3G SDI

Adaptive Cable

Equalizer

SDI

SDO

SDI

SDO

CD

MUTE

BYPASS

RXIN0

TXOUT

RXIN0

LMH0341 3G SDI

Deserializer

To FPGA

RX[4:0]

RXCLK

MUTE

BYPASS

1.0 PF

CD

Reclocked

Loopthrough

5-bit LVDS

+ clk

TXOUT

LMH0344

www.ti.com

SNLS233O – APRIL 2007 – REVISED JULY 2015

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LMH0344 is a single channel 3 Gbps HD – SD SDI Adaptive Cable Equalizer designed to equalize data

transmitted over cable or any media with similar dispersive loss characteristics. The equalizer operates over a

wide range of data rates from 125 Mbps to 2.97 Gbps and supports ST 424, ST 292, ST 344, and ST 259.

Additional features include separate carrier detect and output mute pins which may be tied together to mute the

output when no signal is present. A programmable mute reference is provided to mute the output at a selectable

level of signal degradation. The bypass pin allows the adaptive equalizer to be bypassed.

The LMH0344 accepts either a differential or single-ended input. The input must be AC-coupled. The LMH0344

correctly handles equalizer pathological signals for standard definition and high definition serial digital video, as

described in RP 178 and RP 198, respectively.

8.2 Typical Application

Figure 3. Typical 2.97-Gbps SDI De-Serializer Application

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