LMH730275/NOPB National Semiconductor, LMH730275/NOPB Datasheet

LMH730275/NOPB

Manufacturer Part Number

LMH730275/NOPB

Description

EVAL BOARD HS TRIPLE SSOP OPAMP

Manufacturer

National Semiconductor

Datasheet

1.LMH730275NOPB.pdf (5 pages)

Specifications of LMH730275/NOPB

Channels Per Ic

3 - Triple

Amplifier Type

General Purpose

Board Type

Bare (Unpopulated)

Utilized Ic / Part

16-SSOP Package

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

*LMH730275
*LMH730275/NOPB
LMH730275

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LMH730275/NOPB

Manufacturer:

National Semiconductor

Quantity:

135

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General Description

The LMH730275 evaluation board is designed to aid in the

characterization of National Semiconductor’s high speed

triple SSOP operational amplifiers.

Use the evaluation board as a guide for high frequency

layout and as a tool to aid in device testing and character-

ization.

The evaluation board schematic is shown below in Figure 1.

Refer to the product data sheets for recommendations for

component values.

Basic Operation

By changing R

ances can be matched. The SMA connectors and board

traces are optimized for 50 to 75Ω operation. Other imped-

ances can be matched but performance will be noticeably

different, especially high frequency response. Even with op-

timal 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.

Inverting configuration

The evaluation board is set up for non inverting operation.

For inverting operation make the following modifications (see

Figure 4 and Figure 5): On the bottom of the board cut the

input trace just before the via to the R1 resistors and run

jumpers to the vias that connect to the ground side of R

is on the top side of the board). On the top side of the board

cut the tab between the ground plane and the grounded pad

of R

input impedance of the board it can be soldered between R

and the ground plane where the tab was cut (the board is

labeled for R

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:

LMH730275 Triple High Speed SSOP Op Amp Evaluation

. An additional resistor R

and R

OUT

different input and output imped-

can be used to lower the

MS201012

Board

1. Use a ground plane

2. Include large ( ~ 6.8 µF) capacitors on both supplies:

3. Near the device use .01 µF ceramic capacitors from both

4. For improved bypassing .1 µF ceramic capacitors can

5. Remove the ground and power planes from under the

6. Minimize all trace lengths

7. Use terminated transmission lines for long traces.

8. 2

R1A, R1B and R1Care input matching resistors. ROUTA,

ROUTB and ROUTC are output matching resistors. RDA,

RDB and RDC are input matching resistors for high speed

signals applied to the disable inputs. If the disable inputs are

not used leave RDA, RDB and RDC empty. Sample artwork

for the LMH730275 Evaluation board is included on the next

page in Figure 2.

Measurement Hints

The board is designed for 50Ω input and output connections

into coaxial cables. For other impedances the terminating

resistors can be modified to help match different imped-

ances.

Do not use normal oscilloscope probes to test these circuits.

The capacitive loading will change circuit performance dras-

tically. Instead use low impedance resistive divider probes of

100 to 500Ω. See Figure 3 for a sample resistive probe. The

Low impedance resistor should be 50- 450Ω . The ground

connection should be as short as possible ( ~ 1/2”). Even with

careful use of these probes results should be considered

preliminary until verified with controlled impedance measure-

ments. Even the best probes will interfere with circuit opera-

tion to some degree. Also, tools, power cables, fingers etc.

near the device will change measurement results often

dramatically.

C5 & C6.

supplies to ground: C1-C4

be stacked on top of C1-C4.

input and output pins.

board layout and power supply bypassing experiment

with bypass capacitor values for best results.

Harmonic Distortion performance is impacted by

www.national.com

April 2004

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LMH730275/NOPB Summary of contents

Page 1

... LMH730275 Triple High Speed SSOP Op Amp Evaluation General Description The LMH730275 evaluation board is designed to aid in the characterization of National Semiconductor’s high speed triple SSOP operational amplifiers. Use the evaluation board as a guide for high frequency layout and as a tool to aid in device testing and character- ization ...

Page 2

Measurement Hints (Continued) www.national.com FIGURE 1. Board Schematic 2 20101205 ...

Page 3

Measurement Hints (Continued) FIGURE 2. Board Layout (Actual size = 1.5" x 1.5") 20101201 20101206 FIGURE 3. Probe Schematic 3 20101202 www.national.com ...

Page 4

Measurement Hints (Continued) FIGURE 4. Top Layer Modification for Inverting Operation FIGURE 5. Bottom Layer Modifications of Board for Inverting Operation www.national.com 20101203 20101204 4 ...

Page 5

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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