Datasheet > LMH0026_1

LMH0026_1

更新时间： 2024-01-04 02:38:42

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美国国家半导体 - NSC		时钟
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描述
Replacing the CLC016 Replacing the CLC016 reclocker in many applications

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LMH0026_1 数据手册

National Semiconductor

Application Note 2004

Gary Melchior

Replacing the CLC016

Reclocker with the LMH0026

October 13, 2009

allows a forward migration path from SD to HD to 3G. The

LMH0026 offers improved performance and extremely low

output jitter (half the output jitter of the CLC016 at 270 Mbps).

The LMH0026 also offers a lower supply voltage (3.3V), en-

abling system designers to migrate to lower-power designs.

The LMH0026 provides a 37% power savings over the

CLC016, with typical power of 330 mW in comparison with

525 mW for the CLC016.

Introduction

The LMH0026 SD-SDI reclocker can replace the CLC016 re-

clocker in many applications. The LMH0026 and CLC016 are

both reclockers designed to recover and retime data, primarily

for the SMPTE 259M interface. Both reclockers are rated for

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

The LMH0026, the newer generation SDI reclocker, has ad-

vanced features and is pin compatible with the LMH0046 HD-

SDI reclocker and the LMH0346 3G-SDI reclocker. This

Table 1 shows the key differences between the CLC016 and

LMH0026.

TABLE 1. CLC016 and LMH0026 Key Differences

CLC016

LMH0026

3.3V

Power Supply (V_CC

Package

)

5.0V

28-pin PLCC or TSSOP

40 to 400 Mbps

150 ps_P-P

20-pin e-TSSOP

270 Mbps

74 ps_P-P

Data Rates

Output Jitter

ESD Rating

≥±2 kV HBM

≥±7 kV HBM

Input Interface

2.5V to 5.0V common mode

1.2V to 3.3V common mode

Open collector, requires external 75Ω pullups to

Output Structure

Loop Filter

CML with internal 50Ω pullups (to 3.3V)

Three Components:

Single 56 nF capacitor

0.1 µF capacitor, 82 pF capacitor, 500Ω resistor

Single 270 Mbps rate operation, automatically

bypasses other rates

Rate Selection

Other Features

Four selectable rates, auto or manual rate select

Carrier detect

Bypass/Auto Bypass, choice of 2nd reclocked

data output or clock

3. 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 CLC016 with

the LMH0026

Replacing the CLC016 with the LMH0026 requires a few sim-

ple steps. The device packages and pinouts are quite different

so this change requires a new PCB layout. To replace the

CLC016 with the LMH0026, follow these steps:

4. Change the loop filter circuit to a single 56 nF capacitor

between LF1 and LF2.

5. Add a 27 MHz crystal or suitable external clock

reference. Connect the crystal between the XTAL IN/

EXT CLK and XTAL OUT pins along with the 39 pF

capacitors as shown in the typical application in the

datasheet, or simply connect the 27 MHz external clock

to the XTAL IN/EXT CLK pin.

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

2. Replace the input termination with a single 100Ω

differential termination, located close to the LMH0026

input pins. Check the output common mode voltage of

the driving device to determine if it is compatible with the

LMH0026 input common mode range—if not, add AC

coupling capacitors in series with the input, prior to the

100Ω termination.

Figure 1 shows the typical application for the CLC016, and

Figure 2 shows the typical application for the LMH0026.

301062

www.national.com

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与LMH0026_1相关器件

型号	品牌	获取价格	描述	数据表
LMH0026MH	NSC	获取价格	SD SDI Reclocker with Dual Differential Outputs
LMH0026MH/NOPB	TI	获取价格	具有双路差分输出的 SD SDI 时钟恢复器 \| PWP \| 20 \| -40 to 85
LMH0030	NSC	获取价格	SMPTE 292M/259M Digital Video Serializer with Video and Ancillary Data FIFOs and Integrate
LMH0030	TI	获取价格	具有视频和辅助数据 FIFO 及集成电缆驱动器的 SMPTE 292M/259M 数字视频
LMH0030_0608	NSC	获取价格	SMPTE 292M/259M Digital Video Serializer with Video and Ancillary Data FIFOs and Integrate
LMH0030VS	NSC	获取价格	SMPTE 292M/259M Digital Video Serializer with Video and Ancillary Data FIFOs and Integrate
LMH0030VS	TI	获取价格	具有视频和辅助数据 FIFO 及集成电缆驱动器的 SMPTE 292M/259M 数字视频
LMH0030VS/NOPB	TI	获取价格	具有视频和辅助数据 FIFO 及集成电缆驱动器的 SMPTE 292M/259M 数字视频
LMH0031	TI	获取价格	具有视频和辅助数据 FIFO 的数字视频解串器/解码器
LMH0031	NSC	获取价格	SMPTE 292M/259M Digital Video Deserializer Descrambler with Video and Ancillary Data FIFOs

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