551012922-001/NOPB National Semiconductor, 551012922-001/NOPB Datasheet

551012922-001/NOPB

Manufacturer Part Number

551012922-001/NOPB

Description

SC-70 Amplifier Universal Evaluation Board

Manufacturer

National Semiconductor

Datasheet

1.551012875-001.pdf (10 pages)

Specifications of 551012922-001/NOPB

Silicon Manufacturer

National

Application Sub Type

Operational Amplifiers

Kit Application Type

Amplifier

Silicon Core Number

LMV651, LMV641, LMV841, LMV771, LMV551, LMV981, LMV851, LMV821, LMV831, LMV321, LPV321, LMV341

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551012875, 551012922

Universal Op Amp

Evaluation Boards (SOT-23

and SC-70)

Overview

The 551012875 and 551012922 Universal Evaluation Boards

are designed to aid in the evaluation and testing of National

Semiconductor’s low voltage/ low power and some precision

operational amplifiers. These boards will accommodate op

amps that are assembled in a 6-Pin or 5-Pin SOT-23 and

SC-70 package, regardless of the pin orientation.

This board is designed to use one or two amplifiers. Many

different circuits can be made such as inverting, non-invert-

ing, and differential-IN-differential-OUT amplifiers and low-

pass, high-pass, band-pass, band-reject, or notch second-

order filters. The amplifiers can be powered with single or dual

supplies. These circuits can be configured without any mod-

ifications to the board; all that is necessary is to select the

correct resistors and capacitors. The other optional compo-

nents can be left open or shorted depending on the configu-

ration desired.

These universal evaluation boards are designed as two-layer

boards; the top side of each is designed for op amps with a

pinout as shown in

The bottom side of each board is designed for op amps with

the pinout shown in

tured with vias connecting the equivalent pins of the top and

bottom amplifiers. For example, Pin 1 of IC

Pin 3 of IC

bottom amplifiers are connected. This allows for an efficient

use of one board to test two amplifiers of different package

types while keeping the same components on the board; just

make sure that only one amplifier is soldered to the same

pads.

Circuit performance of this evaluation board will be compa-

rable to final production designs. Use this evaluation board as

a guide for general layout and a tool to aid in device testing

and characterization.

WEBENCH

FIGURE 1. Connection Diagram for IC

is a registered trademark of National Semiconductor Corporation.

. Similarly all other equivalent pins of the top and

Figure

SOT-23/SC-70

2. The board has been manufac-

300137

30013722

is connected to

and IC

National Semiconductor

Application Note 1606

Mike Stout

September 8, 2009

Hardware Setup

COMPONENT NOTATION

The pins of the footprint for IC

alent pins for the footprint of IC

plifier in IC

to the specific amplifier; for example, R

and R

ferred to, as an example, C

component C

In some circuits, a resistor will be installed where the PCB is

labeled for a capacitor or a capacitor will be installed where a

resistor is labeled. For example, C

should be in the R

installed in the C

POWER

Power is applied to the points labeled V

single supply is used, then V

A virtual ground, halfway between the positive supply voltage

and ground, is the reference point for the input and output

voltages. The output voltage swings above and below this

virtual ground. Single-supply operation requires the genera-

tion of this virtual ground, usually at a voltage equal to V

The circuit in

itor C

noise or transients on the positive supply rail.

should be of equal values. This junction along with capac-

FIGURE 2. Connection Diagram for IC

and IC

as Amp B. The subscript of the PCB component refers

will form a low-pass filter used to eliminate conducted

for Amp B. In this document, components will be re-

Figure 3

or IC

Therefore, this document will refer to the am-

, if using Amp B this refers to component

position.

position. R

as Amp A and the amplifier in IC

can be used to generate V

SOT-23/SC-70

−

. If using Amp A this refers to

should be connected to GND.

are connected to the equiv-

means that a resistor will be

and the same is true for

indicates that a capacitor

−

, GND, and V

is used for Amp A

30013723

www.national.com

and IC

/2; R

. If a

and

/2.

Related parts for 551012922-001/NOPB

551012922-001/NOPB Summary of contents

Page 1

... Universal Op Amp Evaluation Boards (SOT-23 and SC-70) Overview The 551012875 and 551012922 Universal Evaluation Boards are designed to aid in the evaluation and testing of National Semiconductor’s low voltage/ low power and some precision operational amplifiers. These boards will accommodate op amps that are assembled in a 6-Pin or 5-Pin SOT-23 and SC-70 package, regardless of the pin orientation ...

Page 2

FIGURE 3. Single Supply Virtual Ground OP AMP Solder an op amp to either the circuit requiring two op amps, solder an additional op amp to either The corresponding pinout is ...

Page 3

ACTIVE FILTER APPLICATIONS Both Sallen-Key and Multiple Feedback filters can be built on this PCB. To design a filter, use the WEBENCH www.national.com. Performance at high frequencies is limit the gain bandwidth product of the amplifier, but within ...

Page 4

FIGURE 9. Multiple Feedback High-Pass Filter SALLEN-KEY BAND-PASS FILTER C Short 3 R Short 13 R Output series resistance (used for matching 7 transmission lines or isolation) R Input Termination 8 Set as determined using WEBENCH ...

Page 5

DIFFERENTIAL INPUT, DIFFERENTIAL OUTPUT, NON- INVERTING Combining two non-inverting amplifiers with a common feed- back network, as shown in Figure 13, forms a non-inverting amplifier with a differential input and a differential output. Through the inherent cancellation of the two ...

Page 6

www.national.com 6 ...

Page 7

FIGURE 15. 551012875-001 Top Layout FIGURE 16. 551012875-001 Bottom Layout 7 30013701 30013702 www.national.com ...

Page 8

www.national.com 8 ...

Page 9

... FIGURE 18. 551012922-001 Top Layout FIGURE 19. 551012922-001 Bottom Layout 9 30013704 30013705 www.national.com ...

Page 10

... 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 LED Lighting www ...

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