LMH0026_1 NSC [National Semiconductor], LMH0026_1 Datasheet

LMH0026_1

Manufacturer Part Number

LMH0026_1

Description

Replacing the CLC016 Replacing the CLC016 reclocker in many applications

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LMH0026_1.pdf (4 pages)

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Replacing the CLC016

Reclocker with the LMH0026

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

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:

Power Supply (V

Package

Data Rates

Output Jitter

ESD Rating

Input Interface

Output Structure

Loop Filter

Rate Selection

Other Features

Change the power supply from 5V to 3.3V.

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.

)

Four selectable rates, auto or manual rate select

Open collector, requires external 75Ω pullups to

0.1 µF capacitor, 82 pF capacitor, 500Ω resistor

2.5V to 5.0V common mode

TABLE 1. CLC016 and LMH0026 Key Differences

28-pin PLCC or TSSOP

Three Components:

301062

40 to 400 Mbps

Carrier detect

≥

±2 kV HBM

150 ps

CLC016

5.0V

P-P

National Semiconductor

Application Note 2004

Gary Melchior

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.

Table 1

LMH0026.

Figure 1

Figure 2

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.

Change the loop filter circuit to a single 56 nF capacitor

between LF1 and LF2.

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.

shows the key differences between the CLC016 and

shows the typical application for the LMH0026.

shows the typical application for the CLC016, and

Single 270 Mbps rate operation, automatically

Bypass/Auto Bypass, choice of 2nd reclocked

CML with internal 50Ω pullups (to 3.3V)

1.2V to 3.3V common mode

Single 56 nF capacitor

bypasses other rates

data output or clock

20-pin e-TSSOP

≥

LMH0026

270 Mbps

±7 kV HBM

74 ps

3.3V

P-P

www.national.com

Related parts for LMH0026_1

LMH0026_1 Summary of contents

Page 1

Replacing the CLC016 Reclocker with the LMH0026 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. ...

Page 2

INPUT INTERFACE The input common mode voltage range of the CLC016 is be- tween 2.5V and V (5V), and the minimum differential input CC amplitude is 200 mV. When the CLC016 input is driven by an equalizer such as the ...

Page 3

The LMH0026 provides much more flexibility. The LMH0026 outputs are CML with internal 50Ω pullups to 3.3V. They may be DC coupled to many more types of inputs, including the LMH0001 cable driver. Typically only a far-end differential termination (a ...

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 ...

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