CLC730132/NOPB National Semiconductor, CLC730132/NOPB Datasheet

CLC730132/NOPB

Manufacturer Part Number

CLC730132/NOPB

Description

EVAL BOARD FOR THE LMH6560MT

Manufacturer

National Semiconductor

Datasheets

1.CLC730145.pdf (23 pages)

2.CLC730145.pdf (5 pages)

Specifications of CLC730132/NOPB

Channels Per Ic

4 - Quad

Amplifier Type

Buffer

Board Type

Bare (Unpopulated)

Utilized Ic / Part

LMH6560

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Operating Temperature

Output Type

Current - Output / Channel

Voltage - Supply, Single/dual (±)

-3db Bandwidth

Slew Rate

Current - Supply (main Ic)

Other names

*CLC730132
*CLC730132/NOPB
CLC730132

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General Description

The CLC730145 and the CLC730132 evaluation boards are

designed to aid in the characterization of National Semicon-

ductor’s High Speed SOIC and TSSOP buffers. Use these

evaluation boards as a guide for high frequency layout and

as a tool to aid in device testing and characterization. The

evaluation boards schematic are shown in Figure 1 and

Figure 2. Refer to the product data sheets for recommenda-

tions for component values.

Basic Operation

These boards are a very straight forward design and are

intended to evaluate the parts behavior by offering 50Ω

inputs and outputs traces for connection to coaxial cables

with the same impedance. For other impedances the termi-

nating resistors can be modified to help match different

impedances. Both board and part are designed to handle

very high frequencies. By changing the resistor connected to

the input pin and ground the input impedance can be

matched but keep in mind that the input trace is designed for

50Ω. By using e.g. 75Ω impedance, the results will be no-

ticeably different especially for the highest frequencies. Also

at the output it is possible to match different impedances but

the output trace is designed for 50Ω. With the series resistor

at the output the output cable can be matched, however this

is not necessary. It is absolutely necessary to have the

impedance at the end of the connected cable matched to the

cable impedance but not the resistor at the beginning. Hav-

ing the output series resistor matched to the cable imped-

ance gives only an additional attenuation of −6dB. The SMA

connectors are optimized for 50Ω operation. Even with opti-

mal layout, board parasitics play a large part in high fre-

quency performance and different termination resistors will

change the frequency of the dominant parasitic poles/zeros.

Layout Considerations

Printed circuit board layout and supply bypassing play major

roles in determining high frequency performance. When de-

signing your own board use these evaluation boards as a

guide and follow these steps to optimize high frequency

performance:

• Use a ground plane

• Include large (10µF) capacitors on both supplies.

• Near the device use 10nF ceramic capacitors from both

• Near the device use a 0.1µF ceramic capacitor between

supplies to ground.

the supplies.

Quad High-Speed Buffer Evaluation Boards

CLC730145, CLC730132 (SOIC and TSSOP)

MS200709

• Minimize all trace lengths

• Terminated always all transmission lines used.

The capacitor between both supplies is recommended for

best 2nd Harmonic Distortion performance. The zenerdiode

between both supplies protect the device from reverse po-

larity supply connections under the condition these supplies

have the current limitation on. Most high-speed buffers per-

form best with capacitive loads if a small resistor is used in

series between the amplifier and the capacitor. In that case,

change the output series resistor to a value of about 10Ω

and evaluate what the output signal will do. Determine the

right value by trial and error. While using rather high capaci-

tive loads the matching at the output become less important

because the frequency response will be dramatically lower,

so a flat response will be more important. See the part’s

datasheets for recommended values. Sample artwork for the

CLC730145 and the CLC730132 Evaluation boards is in-

cluded on Figure 3.

Measurement Hints

The test board offers the customer two channels out of the

four buffers connected to SMA connectors. This includes the

possibility for doing measurements on cross talk and gain

matching. Furthermore it is not recommended to use normal

oscilloscope probes to test these circuits, especially when

measuring the highest frequency regions the part is active.

The capacitive loading will change circuit performance dras-

tically. Instead use high frequency low ohmic passive

probes. These probes have a load resistance in the range of

several hundred ohms until some kΩ. For best performance

use ground leads as short as possible otherwise ringing on

pulse shaped signals will occur. The use of active probes

gives also good results if basic rules are obtained, such as

the short ground leads. Another good idea to isolate the load

from the device is to change the output series resistor to a

value of 450Ω. While measuring with a coaxial cable in a

50Ω system an attenuation of 10x (20dB) will occur and this

acts as a resistive probe of 10:1. Even the best probes will

interfere with circuit operation to some degree. Also, tools,

power cables, fingers etc. near the device will change mea-

surement results. If the circuit has a good layout and there-

fore exhibits a stable behavior the measurement results will

only slightly changed by e.g. a fingertip on the circuit. If

measurement results will change dramatically it is likely the

circuit exhibits oscillations or other unwanted behavior.

www.national.com

April 2003

Related parts for CLC730132/NOPB

CLC730132/NOPB Summary of contents

Page 1

... Near the device use 10nF ceramic capacitors from both supplies to ground. • Near the device use a 0.1µF ceramic capacitor between the supplies. © 2003 National Semiconductor Corporation • Minimize all trace lengths • Terminated always all transmission lines used. The capacitor between both supplies is recommended for best 2nd Harmonic Distortion performance ...

Page 2

Board Schematics FIGURE 1. Test Board Schematic SOIC (CLC730145) www.national.com 20070907 2 ...

Page 3

Board Schematics (Continued) FIGURE 2. Test Board Schematic TSSOP (CLC730132) 20070908 3 www.national.com ...

Page 4

Board Layout SOIC Package (CLC730145) Top Silk Top Copper Bottom Copper www.national.com TSSOP Package (CLC730132) 20070902 20070904 20070905 FIGURE 3. Test Board Lay-Outs 4 20070901 Top Silk 20070903 Top Copper 20070906 Bottom Copper ...

Page 5

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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