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Related Manuals for Texas Instruments THS3115 EVM
Summary of Contents for Texas Instruments THS3115 EVM
- Page 1 THS3115/25 EVM User’s Guide May 2002 SLOU126...
- Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
- Page 3 EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
- Page 4 EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright ã 2002, Texas Instruments Incorporated...
- Page 5 Information About Cautions and Warnings Preface Read This First About This Manual This manual provides information about the evaluation module of the current feedback amplifier under test. Additionally, this document provides a good ex- ample of PCB design for high-speed applications. The user should keep in mind the following points.
- Page 6 Operation of this equipment in other en- vironments 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. Trademarks PowerPAD is a trademark of Texas Instruments.
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Page 7: Table Of Contents
Contents Contents Introduction and Description ........... . Description . - Page 8 ......... 5--2 Bottom (Layer 2) (Ground and SIgnal) for THS3115 EVM ......
- Page 9 Chapter 1 Introduction and Description The Texas Instruments THS3115/25 evaluation module (EVM) helps designers evaluate the performance of the THS3115/25 current feedback operational amplifier (CFA). This EVM is also a good example of high-speed PCB design. This document details the THS3115/25 EVM. It includes a list of EVM features,...
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Page 10: Description
Description 1.1 Description The THS3115/25 EVM provides a platform for developing high-speed CFA application circuits. It contains the THS3115/25 high-speed CFA, a number of passive components, and various features and footprints that enable the user to experiment, test, and verify various operational amplifier circuit implementations. -
Page 11: Schematic Of The Populated Circuit On The Evm (Default Configuration)
EVM Default Configuration The default configuration assumes a 50-W signal source, and contains a termination resistor R2 or R8 (49.9 W) for the source. Some components such as C1, C2, C3, C4, J1, J2, and J3 are omitted on the application schematics of chapter 4 for clarity. -
Page 12: Using The Ths3115/25 Evm
Chapter 2 Using the THS3115/25 EVM It is recommended that the user perform the following exercises to learn the function of the EVM. This practice helps the user learn about the various terminals on the EVM and their function. In addition, it lists the components and equipment needed to operate the EVM. -
Page 13: Required Equipment
Required Equipment 2.1 Required Equipment One double-output dc power supply (±15 V, 1-A output minimum) One single-output dc power supply (+5V, 100-mA output minimum) – referred to in this document as a shutdown supply Two dc current meters with resolution to 1 mA and capable of the maximum current from the dc power supply. -
Page 14: Input And Output Setup For Channel 1
Input and Output Setup for Channel 1 Figure 2- -1. Power Supply Connection for ±15 Vdc 2.3 Input and Output Setup for Channel 1 1) Set the function generator to generate a 1-MHz, ±0.5 V (1-V ) sine wave with no dc offset. 2) Turn off the function generator before proceeding to the next step. -
Page 15: Operating The Evm On Channel 1
Operating the EVM on Channel 1 Figure 2- -2. Signal Connections for Channel 1 2.4 Operating the EVM on Channel 1 1) Turn on the dc power supply. 2) Verify that both the +15 V (current meter 1) and the –15 V (current meter 2) currents are below 25 mA. -
Page 16: Oscilloscope Output For Channel
Operating the EVM on Channel 1 Figure 2- -3. Oscilloscope Output for Channel 1 600 m 400 m INPUT 200 m - -200 m OUTPUT - -400 m - -600 m 500 n 1 ms t - - Time - - s 5) Set the shutdown supply to 0 V, but leave it off. -
Page 17: Input And Output Setup For Channel 2
Input and Output Setup for Channel 2 2.5 Input and Output Setup for Channel 2 1) Verify that the function generator is still set to generate a 1-MHz, ±0.5 V (1-V ) sine wave with no dc offset. 2) Turn off the function generator before proceeding to the next step. 3) Connect a BNC T connector to the output of the function generator. -
Page 18: Operating The Evm On Channel 2
Operating the EVM on Channel 2 2.6 Operating the EVM on Channel 2 1) Turn on the dc power supply. 2) Verify that both the +15 V (current meter 1) and the –15 V (current meter 2) currents are below 25 mA. Currents above the limits stated above indicate a possible short or a wrong resistor value on the PCB. -
Page 19: Oscilloscope Output For Channel 2 With Shutdown Activated
Operating the EVM on Channel 2 Figure 2- -7. Oscilloscope Output for Channel 2 With Shutdown Activated 600 m 400 m INPUT 200 m OUTPUT - -200 m - -400 m - -600 m 500 n 1 ms t - - Time - - s... -
Page 20: Circuit Design Examples
Chapter 3 Circuit Design Examples Several example applications are presented in this chapter. These applications demonstrate the most popular circuits to the user, but many other circuits can be constructed. The user is encouraged to experiment with different circuits, exploring new and creative design techniques. That, after all, is the function of an evaluation board. -
Page 21: Inverting Stage (Channel 1) Operation
Inverting Stage (Channel 1) Operation 3.1 Inverting Stage (Channel 1) Operation Inverting stage operation was shown in Chapter 2 of this manual. The default configuration is a 50-W terminated input (R2), a 50-W matching resistor output (R5B), and a 100-W load (R6B). The terminating and matching values can be changed if the user requires different termination and matching—for example, 75-W video applications. - Page 22 Inverting Stage (Channel 1) Operation termination 49.9 750 49.9)750 termination + 0.483 peak output 50 ) 49.9 750 termination 49.9)750 source termination This can also be viewed as the Thevenin equivalent voltage looking into the source at J4 of the EVM. From the EVM side.
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Page 23: Noninverting Stage (Channel 2) Operation
Noninverting Stage (Channel 2) Operation 3.2 Noninverting Stage (Channel 2) Operation Noninverting stage operation was shown in Chapter 2 of this manual. The default configuration is a 50-W terminated input (R8), a 50-W matching resistor output (R11B), and a 100-W load (R12B). The terminating and matching values can be changed if the user requires different termination and matching—for example, 75-W video applications. -
Page 24: General High-Speed Amplifier Design Considerations
Chapter 4 General High-Speed Amplifier Design Considerations The THS3115/25 EVM layout has been designed for use with high-speed signals and can be used as an example when designing PCBs incorporating the THS3115/25. Careful attention has been given to component selection, grounding, power supply bypassing, and signal path layout. - Page 25 In general, it is best to keep signal lines as short and as straight as possible. Incorporation of microstrip or stripline techniques is also recommended when signal lines are greater than 1 inch in length. These traces must be designed with a characteristic impedance of either 50 W or 75 W, as required by the application.
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Page 26: Evm Hardware Description
Chapter 5 EVM Hardware Description This chapter describes the EVM hardware. It includes the EVM parts list, the printed-circuit board layout, and the schematic. Topic Page Bill of Materials ..........Circuit Board Layout . -
Page 27: Bill Of Materials
Bill of Materials 5.1 Bill of Materials Table 5- -1. THS3115 EVM Bill of Materials MANUFACTURER’S DISTRIBUTOR’S ITEM DESCRIPTION SIZE DESIGNATOR PART NUMBER PART NUMBER CAP, 6.8 mF, C1, C2 (AVX) (Garrett) tantalum, 35 V, 10% TAJD685K035R TAJD685K035R CAP, 0.1 mF, ceramic,... -
Page 28: Ths3125 Evm Bill Of Materials
Bill of Materials Table 5- -2. THS3125 EVM Bill of Materials MANUFACTURER’S DISTRIBUTOR’S ITEM DESCRIPTION SIZE DESIGNATOR PART NUMBER PART NUMBER CAP, 6.8 mF, tantalum, C1, C2 (AVX) (Garrett) 35 V, 10% TAJD685K035R TAJD685K035R CAP, 0.1 mF, ceramic, 0805 C3, C4 (AVX) (Garrett) X7R, 50 V... -
Page 29: Circuit Board Layout
Circuit Board Layout 5.2 Circuit Board Layout Figure 5- -1. Top Layer 1 (Signals) for THS3115 EVM... -
Page 30: Bottom (Layer 2) (Ground And Signal) For Ths3115 Evm
Circuit Board Layout Figure 5- -2. Bottom (Layer 2) (Ground and SIgnal) for THS3115 EVM EVM Hardware Description... -
Page 31: Schematic
Schematic 5.3 Schematic The full schematic for the THS3115/25 EVM appears below Figure 5- -3. Full Schematic of the EVM SHUTDOWN 750 W 750 W - -IN1 49.9 W 49.9 W THS31x5PWP OUT1 +IN1 100 W - -VS 909 W 909 W - -IN2 R11B... - Page 32 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments THS3115EVM THS3125EVM...