TPA6120A2RGYEVM

User's Guide SLOU394 – July 2014 TPA6120A2RGY Evaluation Module This user's guide describes the characteristics, operation, and use of the TPA6120A2RGY evaluation module (EVM). This user's guide includes EVM description, performance specifications, board layout, bill of materials (BOM), and schematic diagram. 1 2 3 4 Contents Introduction ................................................................................................................... 1.1 Related Documentation from Texas Instruments ............................................................... 1.2 Description ........................................................................................................... 1.3 Performance Specifications ....................................................................................... Getting Started ............................................................................................................... Customizing the EVM ....................................................................................................... 3.1 Single-Ended Inverting Configuration ............................................................................ 3.2 Single-Ended Noninverting Configuration ....................................................................... 3.3 Special Note on Filtering and Capacitors C7 and C8 .......................................................... 3.4 Special Note on Gain and Input Configurations ................................................................ 3.5 Single Power Supply Configuration .............................................................................. EVM Circuit and Layout ..................................................................................................... 4.1 Layout Guidelines ................................................................................................... 4.2 TPA6120A2RGY EVM PCB Layouts ............................................................................. 4.3 Schematic ............................................................................................................ 4.4 Bill of Materials ...................................................................................................... 2 2 2 2 2 4 4 4 4 4 4 5 5 5 7 7 List of Figures 1 TPA6120A2RGY EVM Top Layer ......................................................................................... 3 2 TPA6120A2RGY EVM Top Copper Layer................................................................................ 5 3 TPA6120A2RGY EVM Middle Layer 1 4 5 6 ................................................................................... TPA6120A2RGY EVM Middle Layer 2 .................................................................................... TPA6120A2RGY EVM Bottom Layer ..................................................................................... TPA6120A2RGY EVM Schematic ......................................................................................... 5 5 5 7 List of Tables 1 TPA6120A2RGY EVM Specifications ..................................................................................... 2 2 TPA6120A2RGY EVM Bill of Materials ................................................................................... 7 SLOU394 – July 2014 Submit Documentation Feedback TPA6120A2RGY Evaluation Module Copyright © 2014, Texas Instruments Incorporated 1 Introduction 1 www.ti.com Introduction The TPA6120A2RGY is a high-fidelity audio amplifier. The amplifier can operate from a split power supply, and is designed for low noise, high dynamic range performance. 1.1 Related Documentation from Texas Instruments TPA6120A2 data sheet (literature number SLOS431) 1.2 Description The TPA6120A2RGY EVM is designed to operate specifically with a split power supply and is configured with differential inputs with a gain of 1 V/V. The output signal is routed into a 3.5-mm headphone jack J4. The EVM is approximately 1.5 x 1.25 in. 1.3 Performance Specifications Table 1. TPA6120A2RGY EVM Specifications VCC Supply voltage range MIN MAX UNIT ±5 ±15 V Power supply current rating required 1 A Continuous output power, Po: 32-Ω stereo, VCC = ±12 V 2 W VI Audio input voltage Z(L) Minimum load impedance –VCC VCC 8 Ω CAUTION 1. Accidental swapping of supply polarities causes damage to the device and can cause damage to the other components on the board. 2. Do not short the outputs of the TPA6120A2RGY to either the positive or negative supply when operating with a split power supply. When operating with a single power supply, do not short the outputs to the positive supply. This damages the device. 2 Getting Started Follow these steps to use the TPA6120A2RGY EVM in its original configuration: Power Supply 1. Make sure all external power supplies are turned off. 2. Connect an external power supply with the positive voltage set between 5 V and 15 V to the terminal marked V+ (J1) on the EVM. 3. Connect the negative voltage to the terminal marked V– (J2), making sure the negative voltage is set to the same magnitude as that of the positive (that is, ±5 V, ±12 V, ±15 V). 4. Connect the left signal sources to the screw terminal labeled LIN (J3), and the right signal source to the screw terminal labeled RIN (J5). NOTE: This EVM is configured for differential mode. To operate in single-ended mode, see SingleEnded Inverting Configuration. All trademarks are the property of their respective owners. 2 TPA6120A2RGY Evaluation Module SLOU394 – July 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Getting Started www.ti.com Inputs and Outputs 1. Ensure the signal source is turned off or set to a minimum. 2. Connect the left signal source to the RCA jack labeled LIN+ (J5), and the right signal source to the RCA jack labeled RIN+ (J6). 3. Insert headphones into 3.5 mm headphone jack (J4). Power Up 1. Verify correct voltage polarity on the supplies. 2. Turn on the power supply. 3. Turn on the signal source. 4. Adjust signal source level as needed. Figure 1. TPA6120A2RGY EVM Top Layer SLOU394 – July 2014 Submit Documentation Feedback TPA6120A2RGY Evaluation Module Copyright © 2014, Texas Instruments Incorporated 3 Customizing the EVM 3 www.ti.com Customizing the EVM The TPA6120A2RGY EVM comes in a differential configuration with a gain of 1 V/V. However, the EVM is designed to be flexible, and can be converted to operate in single-ended inverting and noninverting configurations. The TPA6120A2RGY EVM can also be operated in a single power supply configuration. 3.1 Single-Ended Inverting Configuration The TPA6120A2RGY EVM can operate in a single-ended inverting gain configuration without modification. To operate in single-ended mode with the unmodified EVM, simply put the signal line into the inverting terminal (–) and the ground line into the noninverting terminal (+). This yields an inverting configuration with a gain of –1 V/V. The EVM can also be modified to operate in single-ended inverting only mode with a reduced BOM. To do this, short resistors R1, R2, R9 (for the left channel) and short R10, R11, and R12 (for the right channel). Put the signal line on the inverting terminal and the ground line on the noninverting terminal. This yields an inverting configuration with a gain of –1 V/V. 3.2 Single-Ended Noninverting Configuration The EVM can operate in a single-ended noninverting gain configuration without modification by applying the signal line to the noninverting input and the ground line to the inverting input. This yields a gain of +1 V/V. Another possible setup for noninverting configuration is to remove R9 (for the left channel) and R10 (for the right channel). Apply the signal line to the noninverting input and the ground line to the inverting input. This yields a gain of +2 V/V. 3.3 Special Note on Filtering and Capacitors C7 and C8 Capacitors C7 and C8 can be added into the EVM to form a low-pass filter into the amplifier. A typical application for this is to block out the band noise caused by the output of a DAC. When selecting capacitance values, the cut-off frequency of the filter becomes 1/(π × R × C) instead of 1/(2π × R × C) because the capacitor is connected differentially, which halves the required capacitance. 3.4 Special Note on Gain and Input Configurations The TPA6120A2RGY high-fidelity audio power amplifier has two separate channels, left and right. It is not necessary to operate each channel in the same configuration. For test purposes, it may be desirable to operate the left channel with a noninverting configuration, and the right channel with an inverting configuration. One channel may be configured to operate with differential inputs while the other channel with single-ended inputs. The TPA6120A2RGY EVM allows for this flexibility. From a listening standpoint, the best audio performance is achieved when both channels are operated with the same configuration. In this case, there is no sound difference between the left and right channels for the human ear to detect. 3.5 Single Power Supply Configuration The TPA6120A2RGY EVM was not optimized for single power supply operation. To operate in this mode, the V– terminal must be connected to GND. DC-blocking capacitors must be used at the outputs to prevent large amounts of dc current from flowing through the headphones due to the high midrail bias. Likewise, dc-blocking capacitors must be used at the input. R9 and R10 must be removed. The positive input nodes must be biased to midrail. Resistors R9 and R10 tie the positive node to ground. 4 TPA6120A2RGY Evaluation Module SLOU394 – July 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated EVM Circuit and Layout www.ti.com 4 EVM Circuit and Layout The TPA6120A2RGY EVM layout was carefully planned to minimize the capacitance and inductance detected by the output and input pins of the amplifier. This chapter includes the EVM layout, the TPA6120A2RGY EVM component selection, schematic, and BOM. 4.1 Layout Guidelines Use the following guidelines during layout: • Keep layout tight to minimize layout parasitics (that is, keep traces as short as possible and do not cross signal lines, if possible) • Maintain symmetry in the layout to maximize common-mode rejection (CMR) • Maximize copper area connection to the PowerPad for best heat dissipation performance (if cutting the ground plane, make cuts radially and not circularly) • Remove ground plane from inputs to minimize stray capacitance 4.2 TPA6120A2RGY EVM PCB Layouts Figure 2 shows the top copper layer of the TPA6120A2RGY EVM. The RCA jacks at the inputs are configured to short to ground when no plug is inserted. The noninverting configuration of the EVM requires that RIN. and LIN. be at ground. Rather than have the signal go through the long signal trace to get to the input jacks, 0-Ω resistors R11 and R12 are used to provide a connection to ground much closer to the device. A star point for ground should be chosen. For the TPA6120A2RGY EVM, the ground terminal of the board is (J7). Current paths to the star ground should be as direct as possible. Figure 3 through Figure 5 illustrate other TPA6120A2RGY EVM copper layers. Figure 2. TPA6120A2RGY EVM Top Copper Layer Figure 3. TPA6120A2RGY EVM Middle Layer 1 SLOU394 – July 2014 Submit Documentation Feedback TPA6120A2RGY Evaluation Module Copyright © 2014, Texas Instruments Incorporated 5 EVM Circuit and Layout www.ti.com Figure 4. TPA6120A2RGY EVM Middle Layer 2 6 Figure 5. TPA6120A2RGY EVM Bottom Layer TPA6120A2RGY Evaluation Module SLOU394 – July 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated EVM Circuit and Layout www.ti.com 4.3 Schematic Figure 6 illustrates the TPA6120A2RGY EVM schematic. J1 J2 1 2 1 2 C1 10µF C2 0.1µF C3 0.1µF C4 0.1µF C5 0.1µF C6 10µF GND GND U1 GND J3 1 2 R1 R2 402 402 DNPC7 1000pF DNP R5 J5 1 2 402 R7 R8 1 2 6 7 R11 402 LVCC+ RVCC+ 12 10 LVCCRVCCNC NC NC NC LIN+ LIN- R9 806 GND GND R3 13 LOUT RIN- 2 3 1 39.2 9 ROUT RIN+ R10 806 GND 3 4 5 11 R4 15 PAD 402 DNPC8 1000pF DNP GND R6 402 402 GND 14 8 J4 SJ-3523-SMT 39.2 GND TPA6120A2RGY GND R12 402 R13 GND GND 806 R14 806 Figure 6. TPA6120A2RGY EVM Schematic 4.4 Bill of Materials Table 2 list the BOM for this EVM. Table 2. TPA6120A2RGY EVM Bill of Materials (1) Designator Qty Part Number Manufacturer !PCB 1 C1 1 10uF CAP, CERM, 10uF, 25V, +/-20%, X5R, 0603 0603 AIP022 Any C1608X5R1E106M080AC TDK Corporation C2, C3, C4, C5 4 0.1uF CAP, CERM, 0.1uF, 25V, +/-10%, X7R, 0603 0603 GRM188R71E104KA01D MuRata C6 1 10uF CAP, CERM, 10uF, 25V, +/-20%, X5R, 0603 0603 GRM188R61E106MA73 MuRata H1, H2, H3, H4 4 Bumpon, Hemisphere, 0.25 X 0.075, Clear 75x250 mil SJ5382 3M J1, J2, J3, J5 4 Terminal Block, 6A, 3.5mm Pitch, 2Pos, TH 7.0x8.2x6.5mm ED555/2DS On-Shore Technology J4 1 Connector, Audio Jack, 3.5mm, Stereo, SMD Audio Jack SMD SJ-3523-SMT CUI Inc. R1, R2, R5, R6, R7, R8, R11, R12 8 402 RES, 402 ohm, 1%, 0.1W, 0603 0603 RC0603FR-07402RL Yageo America R3, R4 2 39.2 RES, 39.2 ohm, 1%, 0.125W, 0805 0805 CRCW080539R2FKEA Vishay-Dale R9, R10, R13, R14 4 806 RES, 806 ohm, 1%, 0.1W, 0603 0603 CRCW0603806RFKEA Vishay-Dale U1 1 HIGH FIDELITY HEADPHONE AMPLIFIER, RGY0014A RGY0014A TPA6120A2RGY Texas Instruments C7, C8 0 CAP, CERM, 1000pF, 25V, +/-5%, C0G/NP0, 0603 0603 GRM1885C1E102JA01D MuRata FID1, FID2, FID3 0 N/A N/A (1) Value Description Package Reference Printed Circuit Board 1000pF Fiducial mark. There is nothing to buy Fiducial or mount. Unless otherwise noted, all parts may be substituted with equivalents. SLOU394 – July 2014 Submit Documentation Feedback TPA6120A2RGY Evaluation Module Copyright © 2014, Texas Instruments Incorporated 7 ADDITIONAL TERMS AND CONDITIONS, WARNINGS, RESTRICTIONS, AND DISCLAIMERS FOR EVALUATION MODULES Texas Instruments Incorporated (TI) markets, sells, and loans all evaluation boards, kits, and/or modules (EVMs) pursuant to, and user expressly acknowledges, represents, and agrees, and takes sole responsibility and risk with respect to, the following: 1. User agrees and acknowledges that EVMs are intended to be handled and used for feasibility evaluation only in laboratory and/or development environments. Notwithstanding the foregoing, in certain instances, TI makes certain EVMs available to users that do not handle and use EVMs solely for feasibility evaluation only in laboratory and/or development environments, but may use EVMs in a hobbyist environment. All EVMs made available to hobbyist users are FCC certified, as applicable. Hobbyist users acknowledge, agree, and shall comply with all applicable terms, conditions, warnings, and restrictions in this document and are subject to the disclaimer and indemnity provisions included in this document. 2. Unless otherwise indicated, EVMs are not finished products and not intended for consumer use. EVMs are intended solely for use by technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical mechanical components, systems, and subsystems. 3. User agrees that EVMs shall not be used as, or incorporated into, all or any part of a finished product. 4. User agrees and acknowledges that certain EVMs may not be designed or manufactured by TI. 5. User must read the user's guide and all other documentation accompanying EVMs, including without limitation any warning or restriction notices, prior to handling and/or using EVMs. Such notices contain important safety information related to, for example, temperatures and voltages. For additional information on TI's environmental and/or safety programs, please visit www.ti.com/esh or contact TI. 6. User assumes all responsibility, obligation, and any corresponding liability for proper and safe handling and use of EVMs. 7. Should any EVM not meet the specifications indicated in the user’s guide or other documentation accompanying such EVM, the EVM may be returned to TI within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY TI TO USER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. TI SHALL NOT BE LIABLE TO USER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RELATED TO THE HANDLING OR USE OF ANY EVM. 8. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which EVMs might be or are used. TI currently deals with a variety of customers, and therefore TI’s arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services with respect to the handling or use of EVMs. 9. User assumes sole responsibility to determine whether EVMs may be subject to any applicable federal, state, or local laws and regulatory requirements (including but not limited to U.S. Food and Drug Administration regulations, if applicable) related to its handling and use of EVMs and, if applicable, compliance in all respects with such laws and regulations. 10. User has sole responsibility to ensure the safety of any activities to be conducted by it and its employees, affiliates, contractors or designees, with respect to handling and using EVMs. Further, user is responsible to ensure that any interfaces (electronic and/or mechanical) between EVMs and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard. 11. User shall employ reasonable safeguards to ensure that user’s use of EVMs will not result in any property damage, injury or death, even if EVMs should fail to perform as described or expected. 12. User shall be solely responsible for proper disposal and recycling of EVMs consistent with all applicable federal, state, and local requirements. Certain Instructions. User shall operate EVMs within TI’s recommended specifications and environmental considerations per the user’s guide, accompanying documentation, and any other applicable requirements. Exceeding the specified ratings (including but not limited to input and output voltage, current, power, and environmental ranges) for EVMs may cause property damage, personal injury or death. If there are questions concerning these ratings, user should contact a TI field representative prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the specified output range may result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or interface electronics. Please consult the applicable EVM user's guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than 60°C as long as the input and output are maintained at a normal ambient operating temperature. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors which can be identified using EVMs’ schematics located in the applicable EVM user's guide. When placing measurement probes near EVMs during normal operation, please be aware that EVMs may become very warm. As with all electronic evaluation tools, only qualified personnel knowledgeable in electronic measurement and diagnostics normally found in development environments should use EVMs. Agreement to Defend, Indemnify and Hold Harmless. User agrees to defend, indemnify, and hold TI, its directors, officers, employees, agents, representatives, affiliates, licensors and their representatives harmless from and against any and all claims, damages, losses, expenses, costs and liabilities (collectively, "Claims") arising out of, or in connection with, any handling and/or use of EVMs. User’s indemnity shall apply whether Claims arise under law of tort or contract or any other legal theory, and even if EVMs fail to perform as described or expected. Safety-Critical or Life-Critical Applications. If user intends to use EVMs in evaluations of safety critical applications (such as life support), and a failure of a TI product considered for purchase by user for use in user’s product would reasonably be expected to cause severe personal injury or death such as devices which are classified as FDA Class III or similar classification, then user must specifically notify TI of such intent and enter into a separate Assurance and Indemnity Agreement. RADIO FREQUENCY REGULATORY COMPLIANCE INFORMATION FOR EVALUATION MODULES Texas Instruments Incorporated (TI) evaluation boards, kits, and/or modules (EVMs) and/or accompanying hardware that is marketed, sold, or loaned to users may or may not be subject to radio frequency regulations in specific countries. General Statement for EVMs Not Including a Radio For EVMs not including a radio and not subject to the U.S. Federal Communications Commission (FCC) or Industry Canada (IC) regulations, TI intends EVMs to be used only for engineering development, demonstration, or evaluation purposes. EVMs are not finished products typically fit for general consumer use. EVMs may nonetheless generate, use, or radiate radio frequency energy, but have not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or the ICES-003 rules. Operation of such EVMs may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. General Statement for EVMs including a radio User Power/Frequency Use Obligations: For EVMs including a radio, the radio included in such EVMs is intended for development and/or professional use only in legally allocated frequency and power limits. Any use of radio frequencies and/or power availability in such EVMs and their development application(s) must comply with local laws governing radio spectrum allocation and power limits for such EVMs. It is the user’s sole responsibility to only operate this radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and unauthorized by TI unless user has obtained appropriate experimental and/or development licenses from local regulatory authorities, which is the sole responsibility of the user, including its acceptable authorization. U.S. Federal Communications Commission Compliance 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 could void the user's authority to operate the equipment. FCC Interference Statement for Class A EVM devices 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 its own expense. FCC Interference Statement for Class B EVM devices 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. Industry Canada Compliance (English) For EVMs Annotated as IC – INDUSTRY CANADA Compliant: This Class A or B digital apparatus complies with Canadian ICES-003. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. Concerning EVMs Including Radio Transmitters This device complies with Industry Canada licence-exempt RSS standard(s). 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. 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. Canada Industry Canada Compliance (French) Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de l'utilisateur pour actionner l'équipement. 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. 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. 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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, Use EVMs only after user obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to EVMs, or 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. 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