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LMH0001_10

更新时间： 2024-02-14 23:48:04

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器
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Replacing the CLC001 Cable Driver with the LMH0001

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LMH0001_10 数据手册

National Semiconductor

Application Note 2059

Gary Melchior

Replacing the CLC001 Cable

Driver with the LMH0001

May 11, 2010

LMH0002 HD/SD-SDI cable driver and the LMH0302 3G/HD/

SD-SDI cable driver. This allows a forward migration path

from SD to HD to 3G. The LMH0001 provides improved output

return loss along with a 46% power savings over the CLC001,

with typical power of 125 mW in comparison with 231 mW for

the CLC001.

Introduction

The LMH0001 SD-SDI cable driver can replace the CLC001

cable driver in many applications. The LMH0001 and CLC001

are both cable drivers designed to drive 75Ω coaxial cable,

primarily for the SMPTE 259M interface. The supported data

rates are similar between the two devices. Both cable drivers

are powered from a 3.3V supply and rated for industrial tem-

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

Table 1 shows the key differences between the CLC001 and

LMH0001.

The LMH0001, the newer generation SDI cable driver, has

improved performance and is pin compatible with the

TABLE 1. CLC001 and LMH0001 Key Differences

CLC001

LMH0001

38 mA

Supply Current (I_CC) (Typical)

Package

70 mA

8-pin SOIC

DC to 622 Mbps

400 ps

16-pin LLP

DC to 540 Mbps

560 ps

Data Rates

Output Rise/Fall Time (Typical)

ESD Rating

≥±7 kV HBM

≥±5 kV HBM

1.6V + V_SDI/2 to V_CC- V_SDI/2

Input Interface

0.05V to 3.25V common mode

common mode (self biased)

Output Interface

Requires external 75Ω resistor to V_CC

750Ω to V_CC

Requires external 75Ω resistor to GND

1.91 kΩ to ground

R_REFResistor (800 mV_P-POutput)

Meets SMPTE spec with margin

using recommended network

Output Return Loss

Compliant to SMPTE spec

3. In order to meet the SMPTE return loss specification, add

a return loss network in series with the LMH0001 outputs.

This network typically consists of a 5.6 nH inductor in

parallel with a 75Ω resistor, immediately following the

75Ω pullup. If only one output is used, the return loss

network is not necessary on the unused output.

How To Replace the CLC001 with

the LMH0001

Replacing the CLC001 with the LMH0001 requires a few sim-

ple steps. The device packages and pinouts are different so

this change requires a new PCB layout. To replace the

CLC001 with the LMH0001, follow these steps:

1. Check the output common mode voltage of the driving

device to determine if it is compatible with the LMH0001

input common mode range—if so, it is preferred to DC

couple the inputs, and if not, add AC coupling capacitors

in series with the inputs, prior to the input termination.

When AC coupling, remove any bias applied to the inputs

as this is not required for the LMH0001 since the inputs

are self-biased.

4. For SMPTE applications, change the output coupling

capacitor from 1 µF to 4.7 µF. Using this larger AC

coupling capacitor value is good practice when dealing

with the large DC shifts associated with the SMPTE

pathological signals.

5. For 800 mV_P-Poutput, change the R_REFresistor from

1.91 kΩ connected to ground to 750Ω connected to

V_CC. For 1.0 V_P-Poutput, change the R_REFresistor from

1.5 kΩ connected to ground to 590Ω connected to V_CC

Figure 1 shows the typical application for the CLC001, and

Figure 2 shows the typical application for the LMH0001.

2. Replace the 75Ω resistors to ground on the output with

75Ω resistors to V_CC. These pullup resistors should be

placed as close as possible to the LMH0001 output pins.

301239

www.national.com

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与LMH0001_10相关器件

型号	品牌	获取价格	描述	数据表
LMH0001SQ	NSC	获取价格	SMPTE 259M / 344M Serial Digital Cable Driver
LMH0001SQ	INTERSIL	获取价格	SMPTE 259M / 344M Serial Digital Cable Driver
LMH0001SQ/NOPB	TI	获取价格	SMPTE 259M/344M 串行数字电缆驱动器 \| RUM \| 16 \| -40 to
LMH0001SQE/NOPB	TI	获取价格	SMPTE 259M/344M 串行数字电缆驱动器 \| RUM \| 16 \| -40 to
LMH0002	NSC	获取价格	SMPTE 292M / 259M Serial Digital Cable Driver
LMH0002	TI	获取价格	LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver
LMH0002_0610	NSC	获取价格	SMPTE 292M / 259M Serial Digital Cable Driver
LMH0002_08	NSC	获取价格	SMPTE 292M / 259M Serial Digital Cable Driver
LMH0002_14	TI	获取价格	SMPTE 292M / 259M Serial Digital Cable Driver
LMH0002MA	TI	获取价格	LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver

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