Instruction/ maintenance manual of the product THS4141 Texas Instruments
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February 2001 Mixed-Signal Products User ’ s Guide SLOU107.
IMPORT ANT NOTICE T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify , before placing orders, that information being relied on is current and complete.
iii Read This First Preface About This Manual This manual is written to provide information about the evaluation module of the fully differential amplifier under test. Additionally , this document provides a good example of PCB design for high speed applications.
Related Documentation From T exas Instruments iv Information About Cautions and Warnings This book may contain cautions and warnings. This is an example of a caution statement. A caution statement describes a situation that could potentially damage your software or equipment.
Running Title—Attribute Reference v Chapter Title—Attribute Reference Contents 1 Introduction and Description 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Description 1-2 . . . .
Running Title—Attribute Reference vi Figures 1–1 Schematic of the Populated Circuit on the EVM (Default Configuration) 1-3 . . . . . . . . . . . . . . 1–2 Schematic 1-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1 Introduction and Description Introduction and Description The T exas Instruments THS4141 evaluation module (EVM) helps designers evaluate the performance of the THS4141 operational amplifier . Also, this EVM is a good example of high-speed PCB design.
Description 1-2 Introduction and Description 1.1 Description The THS4141 EVM is a good example of PCB design and layout for high-speed operational amplifier applications.
THS4141 EVM Specifications 1-3 Introduction and Description 1.3 THS4141 EVM Specifications Supply voltage range, ± V CC 5 V to ± 15 V (see the device data sheet) . . . . Supply current, I CC (see the device data sheet) . . . . . . . . . . . . . . . .
THS4141 EVM Schematic 1-4 Introduction and Description 1.5 THS4141 EVM Schematic Figure 1–2. Schematic.
Additional Sample Schematics 1-5 Introduction and Description 1.6 Additional Sample Schematics For verification of jumper locations and other bypass components, see the complete EVM schematic in Figure 1–2.
Additional Sample Schematics 1-6 Introduction and Description Figure 1–5. VICR Level Shifter + – THS4141 – + V CC 402 Ω 24.9 Ω 0 Ω V IN AC 0 Ω 0 Ω RX1 0 Ω R1b Rx0 374 Ω R3b R3a 374 Ω R6a C1 V OCM C4 C6 R4b R4a 0 Ω 0 Ω Rx4 Rx5 49.
THS4141 EVM Layout 1-7 Introduction and Description 1.7 THS4141 EVM Layout Figure 1–7. T op Layer (Silkscreen) TEXAS INSTRUMENTS THS4141 EVM REV_B Figure 1–8.
THS4141 EVM Layout 1-8 Introduction and Description Figure 1–9. Internal Plane (Layer 2) (Ground Plane) Figure 1–10. Internal Plane (Layer 3) ( ± V CC Plane).
THS4141 EVM Layout 1-9 Introduction and Description Figure 1–1 1. Bottom (Layer 4) (Ground and Signal).
1-10 Introduction and Description.
2-1 Using the THS4141 EVM Using the THS4141 EVM It is recommended that the user perform the following exercises to learn the usage of the EVM. This practice helps the user learn about the various terminals on the EVM and their function. In addition, it suggests the components and equipment needed to operate the EVM.
2-2 Using the THS4141 EVM 2.1 Required Equipment One double-output dc power supply ( ± 5 V , 100 mA output minimum) T wo dc current meters with resolution to 1 mA and capable of the maximum current the dc power supply can supply . If available, set the current limit on the dc power supply to 100 mA.
2-3 Using the THS4141 EVM 2.3 Input and Output Setup 1) Ensure that JU3, JU4, and JU1 are not installed (open circuit) . 2) Set the function generator to generate a 1 MHz, ± 0.5 V (1 V PP ) sine wave with no dc offset. 3) T urn of f the function generator before proceeding to the next step.
2-4 Using the THS4141 EVM 2.4 T esting the EVM Setup 1) T urn on the dc power supply . 2) V erify that both the +5 V (current meter 1) and the –5 V (current meter 2) currents are below 20 mA. Caution: Currents above 20 mA indicate a possible short or a wrong resistor value on the PCB.
2-5 Using the THS4141 EVM 2.5 Power Down V erification This EVM is used to evaluate devices with and without the shutdown function. Therefore, this step is only applicable if the device has a shutdown function. Please see the data sheet for power-down verification.
Butterworth Filter 2-6 Using the THS4141 EVM Note: T ransformers are used to change the single ended signals to dif ferential signal or vice versa. On this EVM, they can be populated according to the application or the experiment.
THS4141 EVM Bill of Materials 2-7 Using the THS4141 EVM Figure 2–5. Gain vs Phase Butterworth filter with multiple feedback frequency response. V IN = –1 dBm R L = 200 Ω Diff V CC = ± 15 0 –4 –10 0.1 1 Gain – dB 2 6 f – Frequency – MHz 10 10 500 100 –8 –2 4 8 Phase Gain 2.
THS4141 EVM Bill of Materials 2-8 Using the THS4141 EVM T able 2–1. THS4141 EVM Bill of Materials (continued) Ref. Description Size Qty . Manufacturer Part Number R3a, R3b Resistor , 374 Ω , 1% 0805 2 Digi-Key P374CTR-ND R4a, R4b Resistor , 0 Ω , 1% 1206 2 Digi-Key P0.
3-1 General High-Speed Amplifier Design Considerations General High-Speed Amplifier Design Considerations The THS4141 EVM layout has been designed for use with high-speed signals and can be used as an example when designing PCBs incorporating the THS4141.
3-2 General High-Speed Amplifier Design Considerations Finally , proper termination of all inputs and outputs must be incorporated into the layout. Unterminated lines, such as coaxial cable, can appear to be a reactive load to the amplifier .
An important point after buying a device Texas Instruments THS4141 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Texas Instruments THS4141 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Texas Instruments THS4141 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Texas Instruments THS4141 you will learn all the available features of the product, as well as information on its operation. The information that you get Texas Instruments THS4141 will certainly help you make a decision on the purchase.
If you already are a holder of Texas Instruments THS4141, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Texas Instruments THS4141.
However, one of the most important roles played by the user manual is to help in solving problems with Texas Instruments THS4141. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Texas Instruments THS4141 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
