LMH0074_1 NSC [National Semiconductor], LMH0074_1 Datasheet

LMH0074_1

Manufacturer Part Number

LMH0074_1

Description

Replacing the CLC012 Adaptive Cable Equalizer with the LMH0074

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LMH0074_1.pdf (4 pages)

Current page: 1 of 4
Download datasheet (166Kb)

Replacing the CLC014

Adaptive Cable Equalizer

with the LMH0074

Introduction

The LMH0074 SD-SDI adaptive cable equalizer can replace

the CLC014 adaptive cable equalizer in many applications.

The LMH0074 and CLC014 are both adaptive cable equaliz-

ers designed to recover data sent over long cables, primarily

for the SMPTE 259M interface. The supported data rates and

cable lengths are similar between the two devices. The

LMH0074 and CLC014 are both rated for industrial tempera-

ture range operation (-40°C to +85°C).

The LMH0074, the newer generation SDI equalizer, has more

advanced features and is pin compatible with the LMH0044

How To Replace the CLC014 with

the LMH0074

Replacing the CLC014 with the LMH0074 requires a few sim-

ple steps. The device packages and pinouts are quite different

so this change requires a new PCB layout; however, the

equalizer core and features are similar. To replace the

CLC014 with the LMH0074, follow these steps:

Power Supply (V

Package

Data Rates

ESD Rating

Input Interface

Output Structure

AEC Capacitor Value

Carrier Detect / Mute Polarity

Other Features

Change the power supply from 5V to 3.3V.

Remove the 100Ω series resistors at the input to the

equalizer.

)

Open collector, requires external 75Ω pullups

Requires 100Ω series resistor on each input

TABLE 1. CLC014 and LMH0074 Key Differences

301059

50 to 650 Mbps

≥

14-pin SOIC

CD, MUTE

±500V HBM

CLC014

100 pF

to 5V

OEM

5.0V

National Semiconductor

Application Note 2002

Gary Melchior

September 22, 2009

HD-SDI equalizer and the LMH0344 or LMH0384 3G-SDI

equalizer. This allows a forward migration path from SD to HD

to 3G. The LMH0074 also offers a lower supply voltage

(3.3V), enabling system designers to migrate to lower-power

designs. The LMH0074 provides a 28% power savings over

the CLC014, with typical power of 209 mW in comparison with

280 mW for the CLC014.

Table 1

LMH0074.

Figure 1

Figure 2

Add an input return loss network consisting of a 6.8 nH

inductor in parallel with a 75Ω resistor on the active input

between the BNC and the 75Ω termination.

Removed the 75Ω pullups on the output and replace with

a 100Ω differential termination located at the input of the

next stage. The outputs may also be AC coupled, but no

pullups are required.

Replace the 100 pF AEC capacitor with a 1.0 µF AEC

capacitor.

shows the key differences between the CLC014 and

shows the typical application for the LMH0074.

shows the typical application for the CLC014, and

Requires return loss network of 6.8 nH in

CML with internal 50Ω pullups (to 3.3V)

parallel with 75Ω on active input

MUTE

125 to 540 Mbps

≥

16-pin LLP

CD, MUTE

LMH0074

±8 kV HBM

REF

1.0 µF

3.3V

, BYPASS

www.national.com

Related parts for LMH0074_1

LMH0074_1 Summary of contents

Page 1

Replacing the CLC014 Adaptive Cable Equalizer with the LMH0074 Introduction The LMH0074 SD-SDI adaptive cable equalizer can replace the CLC014 adaptive cable equalizer in many applications. The LMH0074 and CLC014 are both adaptive cable equaliz- ers designed to recover data ...

Page 2

INPUT INTERFACE For the typical input interface, the equalizer receives a single- ended signal over 75Ω coaxial cable. The CLC014 requires a 75Ω termination to ground, a 1.0 µF input coupling capaci- tor, and a 100Ω series resistor on each ...

Page 3

OUTPUT INTERFACE The CLC014 outputs are open collector and require 75Ω pullups generate an output voltage. This structure has some limitations when interfacing to non-5V systems. The CLC014 outputs are essentially cut off if the DO output ...

Page 4

For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo ...

Related keywords

LMH0074_1 datasheet
LMH0074_1 data sheet
LMH0074_1 pdf datasheet
LMH0074_1 component
LMH0074_1 part
LMH0074_1 distributor
LMH0074_1 RoHS
LMH0074_1 datasheet download