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Texas Instruments THS4151 manual

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Table of contents for the manual

  • Page 1

    February 2001 Mixed-Signal Products User ’ s Guide SLOU109[...]

  • Page 2

    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. All product[...]

  • Page 3

    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. The user should keep in mind the following points. The design of the high-speed amplif[...]

  • Page 4

    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. This is an example of a warning statement. A warning statement describes [...]

  • Page 5

    Running Title—Attribute Reference v Chapter Title—Attribute Reference Contents 1 Introduction and Description 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Description 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 6

    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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3 Fully-Differential In/Fully-Dif fer[...]

  • Page 7

    1-1 Introduction and Description Introduction and Description The T exas Instruments THS4151 evaluation module (EVM) helps designers evaluate the performance of the THS4151 operational amplifier . Also, this EVM is a good example of high-speed PCB design. This document details the T exas Instruments THS4151 high-speed operational amplifier evaluati[...]

  • Page 8

    Description 1-2 Introduction and Description 1.1 Description The THS4151 EVM is a good example of PCB design and layout for high-speed operational amplifier applications. It is a complete circuit for the high-speed operational amplifier . The EVM is made of the THS4151 high-speed operational amplifier , a number of passive components, and various f[...]

  • Page 9

    THS4151 EVM Specifications 1-3 Introduction and Description 1.3 THS4151 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) . . . . . . . . . . . . . . . . . . . . . . . . Output drive, I O, V CC = ± 15 (see the device data sheet) . . . . . . . . . . .[...]

  • Page 10

    THS4151 EVM Schematic 1-4 Introduction and Description 1.5 THS4151 EVM Schematic Figure 1–2. Schematic[...]

  • Page 11

    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. Figure 1–3. Fully-Differential In/Fully-Differential Out, Without T ransformer + – THS4151 – + V CC V CC– V IN AC 0 Ω 0 Ω RX1 0 ?[...]

  • Page 12

    Additional Sample Schematics 1-6 Introduction and Description Figure 1–5. VICR Level Shifter + – THS4151 – + 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 49.9 Ω 49.9 Ω R10 Rx6 50 Ω Source 402 Ω R6B RX3 49.9 Ω V CC RPU1 RPU2 V CC– Note: Shif[...]

  • Page 13

    THS4151 EVM Layout 1-7 Introduction and Description 1.7 THS4151 EVM Layout Figure 1–7. T op Layer (Silkscreen) TEXAS INSTRUMENTS THS4151 EVM REV_B Figure 1–8. T op (Layer 1) (Signals) TEXAS INSTRUMENTS THS4151 EVM REV_B[...]

  • Page 14

    THS4151 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)[...]

  • Page 15

    THS4151 EVM Layout 1-9 Introduction and Description Figure 1–1 1. Bottom (Layer 4) (Ground and Signal)[...]

  • Page 16

    1-10 Introduction and Description[...]

  • Page 17

    2-1 Using the THS4151 EVM Using the THS4151 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. T opic Page 2.1 Required Equipme[...]

  • Page 18

    2-2 Using the THS4151 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. Note: Some power supplies incorporate current me[...]

  • Page 19

    2-3 Using the THS4151 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. 4) Using a BNC-to-SMA cable, connect the function generat[...]

  • Page 20

    2-4 Using the THS4151 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. Do not proceed until this situation is corrected. 3) T urn on [...]

  • Page 21

    2-5 Using the THS4151 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. 1) Insert the jumper JU1 to power down the device. The current consumption (dc curre[...]

  • Page 22

    Butterworth Filter 2-6 Using the THS4151 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. The V OCM pin of the device may be connected to the center-tap of the transformer , or maybe set via an external source[...]

  • Page 23

    THS4151 EVM Bill of Materials 2-7 Using the THS4151 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 2.8 THS4151 EVM Bill of Materials T able 2–1. THS4151 EV[...]

  • Page 24

    THS4151 EVM Bill of Materials 2-8 Using the THS4151 EVM T able 2–1. THS4151 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 P0.0ECT -ND R6a, R6b Resistor , 402 Ω , 1% 0805 2 Digi-Key P402CTR-ND R1 1 R[...]

  • Page 25

    3-1 General High-Speed Amplifier Design Considerations General High-Speed Amplifier Design Considerations The THS4151 EVM layout has been designed for use with high-speed signals and can be used as an example when designing PCBs incorporating the THS4151. Careful attention has been given to component selection, grounding, power supply bypassing, an[...]

  • Page 26

    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 . By terminating a transmission line with its characteristic impedance, the amplifier ’s load then appears [...]