Datasheet > LMH0074_1

LMH0074_1

更新时间： 2024-01-20 05:37:07

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Replacing the CLC012 Adaptive Cable Equalizer with the LMH0074

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LMH0074_1 数据手册

National Semiconductor

Application Note 2002

Gary Melchior

Replacing the CLC014

Adaptive Cable Equalizer

with the LMH0074

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.

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).

Table 1 shows the key differences between the CLC014 and

LMH0074.

The LMH0074, the newer generation SDI equalizer, has more

advanced features and is pin compatible with the LMH0044

TABLE 1. CLC014 and LMH0074 Key Differences

CLC014

LMH0074

3.3V

Power Supply (V_CC

Package

)

5.0V

14-pin SOIC

50 to 650 Mbps

16-pin LLP

125 to 540 Mbps

Data Rates

ESD Rating

≥±500V HBM

≥±8 kV HBM

Requires return loss network of 6.8 nH in

Input Interface

Requires 100Ω series resistor on each input

parallel with 75Ω on active input

Open collector, requires external 75Ω pullups

Output Structure

CML with internal 50Ω pullups (to 3.3V)

to 5V

AEC Capacitor Value

Carrier Detect / Mute Polarity

Other Features

100 pF

CD, MUTE

OEM

1.0 µF

CD, MUTE

MUTE_REF, BYPASS

3. 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.

4. 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.

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:

5. Replace the 100 pF AEC capacitor with a 1.0 µF AEC

capacitor.

1. Change the power supply from 5V to 3.3V.

Figure 1 shows the typical application for the CLC014, and

Figure 2 shows the typical application for the LMH0074.

2. Remove the 100Ω series resistors at the input to the

equalizer.

301059

www.national.com

12 3 4

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与LMH0074_1相关器件

型号	品牌	获取价格	描述	数据表
LMH0074SQ	INTERSIL	获取价格	SMPTE 259M / 344M Adaptive Cable Equalizer
LMH0074SQ	NSC	获取价格	SMPTE 259M / 344M Adaptive Cable Equalizer
LMH0074SQ/NOPB	TI	获取价格	SMPTE 259M/344M 自适应电缆均衡器 \| RUM \| 16 \| -40 to
LMH0074SQE/NOPB	TI	获取价格	SMPTE 259M/344M 自适应电缆均衡器 \| RUM \| 16 \| -40 to
LMH0074SQX/NOPB	TI	获取价格	SMPTE 259M / 344M Adaptive Cable Equalizer 16-WQFN -40 to 85
LMH020-0850-27G9-00000SS	CREE	获取价格	Visible LED
LMH020-0850-27G9-00000TW	CREE	获取价格	CreeÂ® LMH2 850-lm and 1250-lm LED Modules wi
LMH020-0850-27G9-00001SS	CREE	获取价格	Visible LED
LMH020-0850-27G9-00001TW	CREE	获取价格	Visible LED
LMH020-0850-30G9-00000TW	CREE	获取价格	CreeÂ® LMH2 850-lm and 1250-lm LED Modules wi

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