Texas Instruments THS6222RHFEVM Manuale utente

SBOU229–August 2019

THS6222RHF Evaluation Module

User's Guide

SBOU229–August 2019

THS6222RHF Evaluation Module

This user's guide describes the characteristics, operation, and use of the THS6222RHFEVM. This

evaluation module (EVM) is an evaluation and development kit for evaluating the THS6222IRHF, a

differential line-driver amplifier with a current-feedback architecture that is targeted for use in broadband

power line communications (PLC) line driver applications. A complete circuit description as well as

schematic diagram and bill of materials are included in this document.

Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with

the THS6222RHFEVM.

The following related documentation is available through the Texas Instruments web site at www.ti.com.

Related Documentation

Device Literature Number

THS6222 data sheet SBOS974

Contents

1 Introduction ................................................................................................................... 2

2 Power Connections.......................................................................................................... 2

3 Input and Output Connections ............................................................................................. 3

4 Board Layout ................................................................................................................. 4

5 Schematic and Bill of Materials ............................................................................................ 5

List of Figures

1 Top Layer..................................................................................................................... 4

2 Ground Layer................................................................................................................. 4

3 Power Layer.................................................................................................................. 4

4 Bottom Layer................................................................................................................. 4

5 THS6222RHFEVM Schematic............................................................................................. 5

Introduction

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List of Tables

1 THS6222RHFEVM Specifications......................................................................................... 2

2 Bill of Materials............................................................................................................... 6

Trademarks

All trademarks are the property of their respective owners.

1 Introduction

The THS6222RHFEVM is an evaluation module for the single THS6222 amplifier in the RHF package.

This evaluation module is designed to quickly and easily demonstrate the functionality and versatility of

the amplifier. The EVM is ready to connect to power, signal sources, and test instruments through the use

of onboard connectors. The EVM comes configured for easy connection with common 50-Ωlaboratory

equipment on its inputs and outputs. The amplifier is configured for a differential input with a gain of 10

V/V to a differential output. The board includes jumpers to easily switch the device between different bias

modes and a potentiometer to set the value of the IADJ pin. The EVM can be easily configured for other

gains and for single- or split-supply operation. The output transformer and resistors are configured to

present a 50-Ω, single-ended output.

1.1 Features

• Configured for split-supply operation and easily modified for single supply

• Default gain of 10-V/V configuration can easily be reconfigured for other gains

• Designed for easy connection to standard 50-Ωinput/output impedance test equipment

• Inputs and outputs include subminiature version A (SMA) connectors

1.2 EVM Specifications

Table 1 lists the typical performance specifications for the THS6222RHFEVM.

Table 1. THS6222RHFEVM Specifications

Specification Typical Value Range

Split-supply voltage range ±4 V to ±26 V

Single-supply voltage range (VEE = ground) 8 V to 32 V

Quiescent current (no load, split supply, full-bias mode) 20.5 mA

Output voltage swing (VCC = 12 V, 100-Ωload) 19.6 VPP

Linear output current (VCC = 12 V, 25-Ωload) 355 mA

2 Power Connections

The THS6222RHFEVM is equipped with a wire socket for easy connection of power. The positive supply

input is labeled V+, the negative supply input is labeled V–, and ground (GND) is the unlabeled center

terminal of the power-supply connector.

2.1 Split-Supply Operation

To operate as a split supply, apply the positive supply voltage to V+, the negative supply voltage to V–,

and the ground reference from supply to GND.

2.2 Single-Supply Operation

To operate as a single supply, connect both the V– connector and the GND connector to ground and

apply the positive supply voltage to V+.

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Input and Output Connections

SBOU229–August 2019

THS6222RHF Evaluation Module

3 Input and Output Connections

The THS6222RHFEVM is equipped with SMA connectors for easy connection of signal generators and

analysis equipment. As shipped, the EVM is configured for a gain of 10-V/V, split-supply, differential input

and output with 50-Ωtermination. By default, the inputs INA and INB are configured for a differential input

connection. To use the device with a single-ended input, either use an external transformer or populate

transformer T1 on the board, remove R21, populate R15 with a 0-Ωresistor, and use INA as the single-

ended input. OUTA (J5) is the output connector for single-ended output signals. The output resistors R10

and R11 in combination with the transformer (T2) on the amplifier output provide a 25-Ωload to the

amplifier when terminated in 50 Ωdifferentially. To use the EVM with a single-ended output, remove

resistor R23 and populate resistor R18 with 0 Ω, which gives a single-ended output on OUTA. The EVM

contains provisions for additional output devices to change the loading of the amplifier and to add

protection devices. See the THS6222 data sheet applications section, schematics, and layouts for more

detail and how to reconfigure the EVM.

3.1 Bias Mode Control Pins

The amplifier bias modes can be controlled through shorting jumpers J1 and J2. By default, the jumper

shorts are left unconnected, which pulls the input signals low, leaving the device in its full-bias mode.

Jumper J1 controls pin BIAS-1 and jumper J2 controls pin BIAS-2. In conjunction the jumpers can be used

to place the device in its three bias modes or in shutdown.

3.2 IREF Pin Connection

The fine current adjustment (IADJ) pin of the device is controlled using the potentiometer R17 on the

board. By default the potentiometer is set to 0 Ω, which yields the maximum quiescent current for each

bias mode. By increasing the resistance of the potentiometer, the quiescent current can be reduced to a

desired lowered value at the cost of reduced performance.

3.3 Optional VCM Pin Connection

The EVM includes an optional connection on the VCM (pin 5) of the device for a capacitor. The optional

VCM capacitor can be added to help filter common-mode noise if needed by the application. VCM is not

populated by default on the EVM.

Board Layout

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4 Board Layout

The layer plots of Figure 1 to Figure 4 illustrate the board layers in top to bottom order.

Figure 1. Top Layer Figure 2. Ground Layer

Figure 3. Power Layer Figure 4. Bottom Layer

D D

C C

B B

A A

1 2

7/30/2019

AMPS083E1.SchDoc

Sheet Title:

Size:

Mod. Date:

File:

Sheet: of

B http://www.ti.com

Contact: http://www.ti.com/support

THS6222RHFEVMProject Title:

Designed for: Public Release

Assembly Variant: 001

©Texas Instruments 2018

Drawn By:

Engineer: Jacob Freet

Texas Instruments and/or its licensors do not warrant the accuracy or completeness of this specification or any information contained therein. Texas Instruments and/or its licensors do not

warrant that this design will meet the specifications, will be suitable for your application or fit for any particular purpose, or will operate in an implementation. Texas Instruments and/or its

licensors do not warrant that the design is production worthy. You should completely validate and test your design implementation to confirm the system functionality for your application.

Not in version controlSVN Rev:

AMPS083Number: Rev: E1

TID #: N/A

Orderable: THS6222RHFEVM

Iadj

GND

VCC

GND

VCC

VEE

GND

90 ohm

VEE

VCC

1nF

100V

2.2µF

50V

2.2µF

50V

10nF

50V

IN A

IN B

R15

TT1-6-KK81+

TP1

24.9

R2 0

R16

1.24k

274

10k

24.9

R10

24.9

R11

49.9

R12

49.9

R13

TT1-6-KK81+

0R14

GND

R18

OUT A

OUT B

GND

R19

GND

R20

100nF

25V

C5 100nF

25V

GNDGND

100nF

25V

C7 100nF

25V

GND

100nF

25V

100nF

25V

C10

GND

0R22

0R21

GND

0R23

100nF

25V

C12

100nF

25V

C11

TP2

OUT A

TP3

OUT B

TP4

GND

TP5

GND

Typical Power Supply Current Reading for Different Bias Modes

Bias Mode J1 position J2 position IQ(typ)

Full Open 21 mA

Mid Closed Open 16 mA

Low Open Closed 11 mA

Shut-down Closed Closed < 1mA

Open

CCW

MMBZ27VCL-7-F

100nF

25V

C13

GND

BAT54S-7-F

VCC VCC

GND

0R27

R28

0R26

100nF

25V

C14

R25

R24

VEE VEE

10k ohm

R17

3223W-1-103E

B2_AB

B1_AB

D1 IN+

D1 FB

D2 IN+

D2 FB

BIAS-1/D1D2

BIAS-2/D1D2

NC 14

NC 13

IADJ

NC 11

VS+

21 D1 OUT 20

D2 OUT 17

NC 15

NC 12

VCM

NC 16

PAD 25

NC 10

VS- 22

GND 3

THS6222IRHF

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Schematic and Bill of Materials

SBOU229–August 2019

THS6222RHF Evaluation Module

5 Schematic and Bill of Materials

This section provides the schematic and bill of materials (BOM) for the THS6222RHFEVM.

5.1 Schematic

Figure 5 shows the EVM schematic.

Figure 5. THS6222RHFEVM Schematic

Schematic and Bill of Materials

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5.2 Bill of Materials

Table 2 lists the EVM BOM.

Table 2. Bill of Materials

Designator Qty Value Description Package Reference Part Number Manufacturer

C1, C2 2 2.2uF CAP, CERM, 2.2 uF, 50 V, +/- 10%, X7R, 0805 805 C2012X7R1H225K125AC TDK

C3 1 1000pF CAP, CERM, 1000 pF, 100 V, +/- 20%, X7R, 0603 603 CX0603MRX7R0BB102 Yageo America

C4 1 0.01uF CAP, CERM, 0.01 uF, 50 V, +/- 10%, X7R, 0805 805 08055C103KAT2A AVX

C9, C10 2 0.1uF CAP, CERM, 0.1 uF, 25 V, +/- 5%, X7R, 0603 603 C0603C104J3RACTU Kemet

H1, H2, H3, H4 4 Machine Screw, Round, #4-40 x 1/4, Nylon, Philips panhead Screw NY PMS 440 0025 PH B&F Fastener

Supply

H5, H6, H7, H8 4 Standoff, Hex, 0.5"L #4-40 Nylon Standoff 1902C Keystone

J1, J2 2 Header, 100mil, 2x1, Gold, TH Sullins 100mil, 1x2, 230

mil above insulator PBC02SAAN Sullins Connector

Solutions

J3, J4, J5, J6 4 Connector, End launch SMA, 50 ohm, SMT SMA End Launch 142-0701-851 Cinch Connectivity

J7 1 Terminal Block, 5.08 mm, 3x1, Brass, TH 3x1 5.08 mm Terminal

Block ED120/3DS On-Shore

Technology

L1, L2 2 90 ohm Ferrite Bead, 90 ohm @ 100 MHz, 1.5 A, 1206 1206 MI1206K900R-10 Laird-Signal

Integrity Products

LBL1 1 Thermal Transfer Printable Labels, 0.650" W x 0.200" H - 10,000

per roll PCB Label 0.650 x 0.200

inch THT-14-423-10 Brady

R1, R2 2 24.9 RES, 24.9, 1%, 0.1 W, AEC-Q200 Grade 0, 0402 402 ERJ-2RKF24R9X Panasonic

R3, R4, R5, R6 4 10k RES, 10 k, 5%, 0.1 W, 0603 603 RC1608J103CS Samsung Electro-

Mechanics

R7, R8 2 1.24k RES, 1.24 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 402 CRCW04021K24FKED Vishay-Dale

R9 1 274 RES, 274, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 402 CRCW0402274RFKED Vishay-Dale

R10, R11 2 24.9 RES, 24.9, 1%, 0.1 W, 0603 603 RC0603FR-0724R9L Yageo

R14, R23, R26, R27 4 0 RES, 0, 5%, 0.1 W, 0603 603 RC0603JR-070RL Yageo

R16, R21, R22 3 0 RES, 0, 5%, 0.063 W, 0402 402 RC0402JR-070RL Yageo America

R17 1 10k

ohm TRIMMER 10k OHM 0.125W SMD 3.52x4.16x3.94mm 3223W-1-103E Bourns

T2 1 RF Transformer, 50ohm, 0.004 to 300 MHz, SMT 7.62x6.86mm TT1-6-KK81+ Minicircuits

TP1 1 Test Point, Miniature, Red, TH Red Miniature Testpoint 5000 Keystone

TP4, TP5 2 Test Point, Miniature, Black, TH Black Miniature Testpoint 5001 Keystone

U1 1 THS6222IRHF, RHF0024A (VQFN-24) RHF0024A THS6222IRHF Texas Instruments

C5, C6, C7, C8, C11,

C12, C13, C14 0 0.1uF CAP, CERM, 0.1 uF, 25 V, +/- 5%, X7R, 0603 603 C0603C104J3RACTU Kemet

D1 0 27V Diode, TVS, Uni, 27 V, 38 Vc, SOT-23 SOT-23 MMBZ27VCL-7-F Diodes Inc.

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Schematic and Bill of Materials

SBOU229–August 2019

THS6222RHF Evaluation Module

Table 2. Bill of Materials (continued)

Designator Qty Value Description Package Reference Part Number Manufacturer

D2, D3 0 30V Diode, Schottky, 30 V, 0.2 A, SOT-23 SOT-23 BAT54S-7-F Diodes Inc.

R12, R13 0 49.9 RES, 49.9, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 402 CRCW040249R9FKED Vishay-Dale

R15, R19 0 0 RES, 0, 5%, 0.063 W, 0402 402 RC0402JR-070RL Yageo America

R18, R20, R24, R25,

R28 0 0 RES, 0, 5%, 0.1 W, 0603 603 RC0603JR-070RL Yageo

T1 0 RF Transformer, 50ohm, 0.004 to 300 MHz, SMT 7.62x6.86mm TT1-6-KK81+ Minicircuits

TP2, TP3 0 Test Point, Miniature, Red, TH Red Miniature Testpoint 5000 Keystone

STANDARD TERMS FOR EVALUATION MODULES

1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or

documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance

with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.

1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility

evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not

finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For

clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions

set forth herein but rather shall be subject to the applicable terms that accompany such Software

1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,

or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production

system.

2Limited Warranty and Related Remedies/Disclaimers:

2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License

Agreement.

2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM

to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by

neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have

been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications

or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control

techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.

User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)

business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.

2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit

User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty

period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or

replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be

warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day

warranty period.

WARNING

Evaluation Kits are intended solely for use by technically qualified,

professional electronics experts who are familiar with the dangers

and application risks associated with handling electrical mechanical

components, systems, and subsystems.

User shall operate the Evaluation Kit within TI’s recommended

guidelines and any applicable legal or environmental requirements

as well as reasonable and customary safeguards. Failure to set up

and/or operate the Evaluation Kit within TI’s recommended

guidelines may result in personal injury or death or property

damage. Proper set up entails following TI’s instructions for

electrical ratings of interface circuits such as input, output and

electrical loads.

NOTE:

EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION

KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

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3Regulatory Notices:

3.1 United States

3.1.1 Notice applicable to EVMs not FCC-Approved:

FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software

associated with the kit to determine whether to incorporate such items in a finished product and software developers to write

software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or

otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition

that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference.

Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must

operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter.

3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:

CAUTION

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not

cause harmful interference, and (2) this device must accept any interference received, including interference that may cause

undesired operation.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to

operate the equipment.

FCC Interference Statement for Class A EVM devices

NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of

the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is

operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not

installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to

correct the interference at his own expense.

FCC Interference Statement for Class B EVM devices

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of

the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential

installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance

with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference

will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which

can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more

of the following measures:

•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.

•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

•Consult the dealer or an experienced radio/TV technician for help.

3.2 Canada

3.2.1 For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210 or RSS-247

Concerning EVMs Including Radio Transmitters:

This device complies with Industry Canada license-exempt RSSs. Operation is subject to the following two conditions:

(1) this device may not cause interference, and (2) this device must accept any interference, including interference that may

cause undesired operation of the device.

Concernant les EVMs avec appareils radio:

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation

est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit

accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

Concerning EVMs Including Detachable Antennas:

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser)

gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type

and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for

successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types

listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated.

Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited

for use with this device.

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Concernant les EVMs avec antennes détachables

Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et

d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage

radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope

rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. Le

présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le

manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne

non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de

l'émetteur

3.3 Japan

3.3.1 Notice for EVMs delivered in Japan: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page 日本国内に

輸入される評価用キット、ボードについては、次のところをご覧ください。

http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page

3.3.2 Notice for Users of EVMs Considered “Radio Frequency Products” in Japan: EVMs entering Japan may not be certified

by TI as conforming to Technical Regulations of Radio Law of Japan.

If User uses EVMs in Japan, not certified to Technical Regulations of Radio Law of Japan, User is required to follow the

instructions set forth by Radio Law of Japan, which includes, but is not limited to, the instructions below with respect to EVMs

(which for the avoidance of doubt are stated strictly for convenience and should be verified by User):

1. Use EVMs in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal

Affairs and Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for

Enforcement of Radio Law of Japan,

2. Use EVMs only after User obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to

EVMs, or

3. Use of EVMs only after User obtains the Technical Regulations Conformity Certification as provided in Radio Law of Japan

with respect to EVMs. Also, do not transfer EVMs, unless User gives the same notice above to the transferee. Please note

that if User does not follow the instructions above, User will be subject to penalties of Radio Law of Japan.

【無線電波を送信する製品の開発キットをお使いになる際の注意事項】開発キットの中には技術基準適合証明を受けて

いないものがあります。技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの

措置を取っていただく必要がありますのでご注意ください。

1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用

いただく。

2. 実験局の免許を取得後ご使用いただく。

3. 技術基準適合証明を取得後ご使用いただく。

なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。

上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。日本テキサス・イ

ンスツルメンツ株式会社

東京都新宿区西新宿６丁目２４番１号

西新宿三井ビル

3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page

電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧ください。http:/

/www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page

3.4 European Union

3.4.1 For EVMs subject to EU Directive 2014/30/EU (Electromagnetic Compatibility Directive):

This is a class A product intended for use in environments other than domestic environments that are connected to a

low-voltage power-supply network that supplies buildings used for domestic purposes. In a domestic environment this

product may cause radio interference in which case the user may be required to take adequate measures.

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