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Contents

1

Overview

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4

1.1

Features

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4

1.2

Applications

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4

1.3

Ordering Information

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4

2

4-Level IO Control

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6

3

DS125BR820EVM Configuration Overview

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8

3.1

Quick Start Guide

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9

4

Bill of Materials

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12

5

Schematic

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13

6

EVM Layout

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14

2

Contents

SNLU166 – August 2014

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Copyright © 2014, Texas Instruments Incorporated

Summary of Contents for DS125BR820EVM

Page 1: ...DS125BR820EVM Evaluation Board User s Guide Literature Number SNLU166 August 2014 ...

Page 2: ...ing Information 4 2 4 Level IO Control 6 3 DS125BR820EVM Configuration Overview 8 3 1 Quick Start Guide 9 4 Bill of Materials 12 5 Schematic 13 6 EVM Layout 14 2 Contents SNLU166 August 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 3: ...tion 4 2 1 Description of 4 Level Voltage Inputs 6 2 2 Switch Configuration 7 3 1 Description of Connections 8 3 2 Description of Switch Configuration and Settings 8 3 3 SMA Channel Connections 10 3 4 EQA and EQB Settings Available in Pin Mode 10 3 5 VOD Output Settings available in Pin Mode 11 4 1 Bill of Materials 12 3 SNLU166 August 2014 List of Figures Submit Documentation Feedback Copyright 2...

Page 4: ... DS125BR820 refer to the DS125BR820 datasheet 1 1 Features 8 Channel unidirectional repeater operating at rates up to 12 5 Gbps Linear equalization to support link training protocols EQ up to 10 dB at 6 GHz Variable voltage range up to 1200 mVpp Linear output driver Programmable by pin selection pin mode EEPROM or SMBus interface Single supply operation VIN 3 3 V 10 or VDD 2 5 V 5 40 C to 85 C ope...

Page 5: ...www ti com Ordering Information Figure 1 1 DS125BR820EVM Front Figure 1 2 DS125BR820EVM Back 5 SNLU166 August 2014 Overview Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 6: ...up of three switches in accordance with Figure 2 1 These switches are located on the back of the EVM For switch modules that come in a set of six such as SW3 switches 6 5 4 control one setting and switches 3 2 1 control another Figure 2 1 Switch Orientation for User Configuration NOTE The switches on the back of the EVM physically display the switch numbers in ascending order as shown from the exa...

Page 7: ... Input Setting Switch Settings 3 2 1 or 6 5 4 0 Tie 1kΩ to GND R Tie 20kΩ to GND F Float leave pin open 1 Tie 1kΩ to VIN or VDD NOTE Since each 4 level input setting is controlled by a set of three adjacent switches only one of the three switches can be in the ON position at any time 7 SNLU166 August 2014 4 Level IO Control Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporate...

Page 8: ... EEPROM slot for operation in master J18 EEPROM mode optional J19 PWR VIN 3 3 V or VDD 2 5 V for DC power Tie VIN 3 3 V or VDD 2 5 V to VIH power J20 VIH_SEL jumper required Table 3 2 Description of Switch Configuration and Settings Component Switch No Name and Description Pin and SMBus modes AD2 ADDR 2 6 5 4 Note In Pin mode this must be tied to GND 6 5 4 ON OFF OFF SW1 Pin mode EQB 4 level EQ se...

Page 9: ...s Pin and SMBus modes RES2 Reserved 6 5 4 Note Set all switches to OFF for normal operation SW9 Pin and SMBus modes RX_DET Enable or disable the internal 50Ω to 3 2 1 VDD Input Termination See datasheet for more information SMBus master mode READ_EN Enable load from external EEPROM in master mode SW6 SD_TH 3 2 1 becomes the READ_EN pin SW10 N A To start the loading at power up set SW6 pin 3 to ON ...

Page 10: ... OFF Set SW4 switches 1 and 2 to the OFF positions so the SMBus signals are disconnected Refer to Table 2 1 for information on 3 switch settings for the 4 level input Example Set EQA to Level 3 SW8 3 2 1 OFF OFF OFF EQA F Table 3 4 EQA and EQB Settings Available in Pin Mode EQUALIZATION BOOST RELATIVE TO DC SW8 3 2 1 EQA dB at 1 5 dB at 2 5 dB at 4 dB at 5 dB at 6 SW1 3 2 1 Level EQB GHz GHz GHz G...

Page 11: ...gisters in accordance to the register map in the DS125BR820 datasheet 8 SMBus master mode Set the EQ VOD VOD_DB level Load a pre programmed EEPROM in the J18 EEPROM slot Note that the DS125BR820 can only support EEPROM sizes ranging from 2K 256 Bytes to 8K 1024 bytes The EEPROM must also be capable of an operating frequency up to 1 MHz Set ENSMB FLOAT by setting SW2 3 2 1 OFF OFF OFF Set SW4 switc...

Page 12: ...N HEADER 3POS 100 VERT GOLD 10 1 J18 3M5473 ND 4808 3004 CP SOCKET IC OPEN FRAME 8POS 3 R1 R2 R3 R4 R8 R11 R13 R14 R16 R17 R19 R20 R22 R23 R25 R26 R28 11 31 P1 00KLCT ND ERJ 2RKF1001X RES 1 00K OHM 1 10W 1 0402 SMD R29 R31 R32 R34 R35 R37 R38 R40 R41 R43 R44 R46 R47 R49 12 1 R7 P220LCT ND ERJ 2RKF2200X RES 220 OHM 1 10W 1 0402 SMD R12 R15 R18 R21 R24 R27 R30 R33 13 13 P20 0KLCT ND ERJ 2RKF2002X RE...

Page 13: ...Chapter 5 SNLU166 August 2014 Schematic Figure 5 1 Schematic 13 SNLU166 August 2014 Schematic Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 14: ...lows access to the inner four buffer repeater channels while remaining both very compact and low power The WQFN package offers an exposed thermal pad to enhance electrical and thermal performance This must be soldered to the copper landing on the PWB Figure 6 1 Top Assembly Layer 14 EVM Layout SNLU166 August 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 15: ...www ti com Figure 6 2 Bottom Assembly Layer 15 SNLU166 August 2014 EVM Layout Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 16: ...ring 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 3 ...

Page 17: ... 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 Concernant les EVMs avec antennes détachables Conformément à la rég...

Page 18: ... 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 even with the inputs and outputs kept within the specified allowable ranges some circuit components may have elevated case temperatures These components include but are not limited to linear regulators switching transistors pass transistors cu...

Page 19: ...F REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED 8 2 Specific Limitations IN NO EVENT SHALL T...

Page 20: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

Page 21: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments DS125BR820EVM ...

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