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Summary of Contents for Texas Instruments THS4150
- Page 1 THS4150 EVM User's Guide for High Speed Fully Differential Amplifier User’s Guide February 2001 Mixed-Signal Products SLOU108...
- Page 2 Texas 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 products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability.
- Page 3 It is recommend that the user initially review the datasheet of the device under test. It is also helpful to review the schematic and layout of the THS4150 EVM to determine the design techniques used in the evaluation board. In addition, it is recommended that the user review the application note Fully-Differential Amplifiers (literature number SLOA054B) to gain more insight about differential amplifiers.
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Page 4: Information About Cautions And Warnings
The information in a caution or a warning is provided for your protection. Please read each caution and warning carefully. Related Documentation From Texas Instruments THS4150 data sheet (literature number SLOS321) THS4150 application report (literature number SLOA054A), Fully-Differential Amplifiers FCC Warning This equipment is intended for use in a laboratory test environment only. - Page 5 ............THS4150 EVM Bill of Materials General High-Speed Amplifier Design Considerations Running Title—Attribute Reference...
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Page 6: Table Of Contents
Tables 2–1 THS4150 EVM Bill of Materials .......... -
Page 7: Introduction And Description
Introduction and Description The Texas Instruments THS4150 evaluation module (EVM) helps designers evaluate the performance of the THS4150 operational amplifier. Also, this EVM is a good example of high-speed PCB design. This document details the Texas Instruments THS4150 high-speed operational amplifier evaluation module (EVM). It includes a list of EVM... -
Page 8: Evaluation Module Features
Description 1.1 Description The THS4150 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 THS4150 high-speed operational amplifier, 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 9: Schematic Of The Populated Circuit On The Evm (Default Configuration)
Supply current, I Output drive, I For complete THS4150 amplifier IC specifications, parameter measurement information, and additional application information, see the THS4150 data sheet, TI literature number SLOS321. 1.4 Schematic of the Populated Circuit (Default Configuration) For verification of jumper locations and other bypass components, see the complete EVM schematic in Figure 1–2. -
Page 10: Ths4150 Evm Schematic
THS4150 EVM Schematic 1.5 THS4150 EVM Schematic Figure 1–2. Schematic Introduction and Description... -
Page 11: Fully-Differential In/Fully-Differential Out, Without Transformer
Utilizing the input and output transformers to create a fully-differential signal input/ differential or single output and isolate the amplifier from the rest of the front-end and back-end circuits. Additional Sample Schematics – THS4150 – CC– See the Texas Instruments February 2001 Analog Applications – THS4150 – Introduction and Description... -
Page 12: Vicr Level Shifter
Shifting the VICR within the specified range in the data sheet via RPU1 and RPU2 if the VICR is out of the specified range. See the Application section of the data sheet for the THS4150 for more information. Figure 1–6. Butterworth Filter With Multiple Feedback. -
Page 13: Top (Layer 1) (Signals)
1.7 THS4150 EVM Layout Figure 1–7. Top Layer (Silkscreen) TEXAS INSTRUMENTS THS4150 EVM REV_B Figure 1–8. Top (Layer 1) (Signals) TEXAS INSTRUMENTS THS4150 EVM REV_B THS4150 EVM Layout Introduction and Description... -
Page 14: Internal Plane (Layer 2) (Ground Plane)
THS4150 EVM Layout Figure 1–9. Internal Plane (Layer 2) (Ground Plane) Figure 1–10. Internal Plane (Layer 3) ( V Plane) Introduction and Description... -
Page 15: Bottom (Layer 4) (Ground And Signal)
THS4150 EVM Layout Figure 1–11. Bottom (Layer 4) (Ground and Signal) Introduction and Description... - Page 16 1-10 Introduction and Description...
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Page 17: Using The Ths4150 Evm
..........THS4150 EVM Bill of Materials... -
Page 18: Power Supply Connection
EVM (J8). Figure 2–1. Power Supply Connection CURRENT METER 2 – J8 V CC– J7 V Figures are not drawn to scale. CURRENT METER 1 POWER SUPPLY –5V J9 GND J6 V THS4150 Using the THS4150 EVM sine wave) CC– –... -
Page 19: Signal Connections
Impedance Figures are not drawn to scale. OSCILLOSCOPE J1 V J3 V out– THS4150 EVM J4 V out+ Using the THS4150 EVM ) sine wave ) on ) on the O– ) on the input impedance for Impedance CH-1 CH-2... -
Page 20: Driver 1 Output Signal
50- termination resistor. Use Figure 3 as a reference for the input and output signals. Figure 2–3. Driver 1 Output Signal and V should be 180 degrees out of phase. The internal OUT– THS4150 Using the THS4150 EVM... -
Page 21: Power Down Verification
5) Place the probe at the output nodes (if a differential probe is used, insert the probe into the provided jumper), and measure the frequency response. on each output node). values providing the path to the differential Using the THS4150 EVM... -
Page 22: Multiple Feedback Filter Circuit
Figure 2–4. Multiple Feedback Filter Circuit –1 dBm 220 pF pin of the device may be connected pin is not connected to an external level will be set to zero. 100 pF – THS4150 – –5 V 100 pF Using the THS4150 EVM... -
Page 23: Gain Vs Phase
Figure 2–5. Gain vs Phase Butterworth filter with multiple feedback frequency response. –2 –4 –8 –10 2.8 THS4150 EVM Bill of Materials Table 2–1. THS4150 EVM Bill of Materials Ref. Description C1, C4, Capacitor, 0.1 F, ceramic C5, C6 C7, C8 Capacitor, 6.8 F, 35 V, 20%... - Page 24 THS4150 EVM Bill of Materials Table 2–1. THS4150 EVM Bill of Materials (continued) Ref. Description R3a, R3b Resistor, 374 , 1% R4a, R4b Resistor, 0 , 1% R6a, R6b Resistor, 402 , 1% Resistor, 10 k , 1% R10, RX3, Resistor, 49.9 , 1%...
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Page 25: General High-Speed Amplifier Design Considerations
Chapter 3 General High-Speed Amplifier Design Considerations The THS4150 EVM layout has been designed for use with high-speed signals and can be used as an example when designing PCBs incorporating the THS4150. Careful attention has been given to component selection, grounding, power supply bypassing, and signal path layout. - Page 26 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 to be purely resistive, and reflections are absorbed at each end of the line.
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