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Summary of Contents for Texas Instruments THS4121
- Page 1 THS4121 EVM User's Guide for High Speed Fully Differential Amplifier User’s Guide July 2001 Mixed-Signal Products SLOU118...
- Page 2 IMPORTANT NOTICE 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 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...
- 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 2001, Texas Instruments Incorporated...
- Page 5 It is also helpful to review the schematic and layout of the THS4121 EVM to determine the design techniques used in the evaluation board. In addition,...
- Page 6 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 THS4121 data sheet (literature number SLOS319A) Application report (literature number SLOA054B), Fully-Differential Amplifiers FCC Warning This equipment is intended for use in a laboratory test environment only.
- Page 7 ............THS4121 EVM Bill of Materials .
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Page 8: Table Of Contents
2–1 THS4121 EVM Bill of Materials .......... - Page 9 The Texas Instruments THS4121 evaluation module (EVM) helps designers evaluate the performance of the THS4121 operational amplifier. Also, this EVM is a good example of high-speed PCB design. This EVM enables the user to implement various circuits to clarify the available configurations presented by the schematic of the EVM.
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Page 10: Schematic
Description 1.1 Description This EVM is made of the THS4121 high-speed operational amplifier, a number of passive components, and various features and component footprints that enable the user to experiment and verify various operational amplifier circuit configurations. Initially, this board is populated for a single-ended input/differential-output amplifier (see Figure 1-2 for populated circuits). -
Page 11: Schematic Of The Populated Circuit On The Evm (Default Configuration)
......(see the device data sheet) For complete THS4121 amplifier IC specifications, parameter measurement information, and additional application information, see the THS4121 data sheet, TI literature number SLOS319. 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 12: Ths4121 Evm Schematic
THS4121 EVM Schematic 1.5 THS4121 EVM Schematic Figure 1–2. Schematic Introduction and Description... -
Page 13: Fully-Differential In/Fully-Differential Out, Without Transformer
– 0 Ω 0 Ω 0 Ω 0 Ω See the Texas Instruments February 2001 Analog Applications Note: Fully-differential in / fully-differential out signal path. Journal for the information on the termination resistors Figure 1–4. Fully-Differential In/Fully-Differential Out, Utilizing Transformer 50 Ω... -
Page 14: 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 THS4121 for more information. Figure 1–6. Butterworth Filter With Multiple Feedback. -
Page 15: Top Layer (Silkscreen)
THS4121 EVM Layout 1.7 THS4121 EVM Layout Figure 1–7. Top Layer (Silkscreen) TEXAS INSTRUMENTS THS4121 EVM REV A Figure 1–8. Top (Layer 1) (Signals) TEXAS INSTRUMENTS THS4121 EVM REV A Introduction and Description... -
Page 16: Internal Plane (Layer 2) (Ground Plane)
THS4121 EVM Layout Figure 1–9. Internal Plane (Layer 2) (Ground Plane) Figure 1–10. Internal Plane (Layer 3) (± Power Plane) Introduction and Description... - Page 17 THS4121 EVM Layout Figure 1–11. Bottom (Layer 4) (Ground and Signal) Introduction and Description...
- Page 18 1-10 Introduction and Description...
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Page 19: Topic Page
..........2–6 THS4121 EVM Bill of Materials ....... . . -
Page 20: Power Supply Connection
EVM (J8). Figure 2–1. Power Supply Connection CURRENT CURRENT METER 2 METER 1 POWER SUPPLY +1.65 V –1.65V – – J8 V J9 GND J7 V J6 V THS4121 Figures are not drawn to scale. Using the THS4121 EVM... -
Page 21: Signal Connections
Figure 2–2. Signal Connections OSCILLOSCOPE 50 Ω Impedance FUNCTION GENERATOR 1 MHz CH-1 CH-2 0 V Offset J1 V J3 V 50 Ω Source out– Impedance THS4121 EVM J4 V out+ Figures are not drawn to scale. Using the THS4121 EVM... -
Page 22: Driver 1 Output Signal
50-Ω termination resistor. Use Figure 3 as a reference for the input and output signals. Figure 2–3. Driver 1 Output Signal THS4121 Using the THS4121 EVM... -
Page 23: Power Down Verification
The 0-Ω resistors provide the path to the differential probe termi- nals. 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. Using the THS4121 EVM... -
Page 24: Multiple Feedback Filter Circuit
EVM schematic in Figure 1–2. Figure 2–4. Multiple Feedback Filter Circuit 787 Ω 100 pF 787 Ω 732 Ω 100 Ω – –1 dBm 220 pF 732 Ω – 787 Ω 100 Ω 100 pF 787 Ω Using the THS4121 EVM... -
Page 25: Gain Vs Phase
V IN = –1 dBm –8 R L = 200 Ω Diff V DD = ±1.65 –10 f – Frequency – MHz 2.8 THS4121 EVM Bill of Materials Table 2–1. THS4121 EVM Bill of Materials Ref. Description Size Qty. Manufacturer Part Number Capacitor, 0.1 µF, ceramic... - Page 26 THS4121 EVM Bill of Materials Table 2–1. THS4121 EVM Bill of Materials (continued) Ref. Description Size Qty. Manufacturer Part Number Resistor, 150 Ω, 1% R3a, R3b 0805 Digi-Key Resistor, 0 Ω, 1% R4a, R4b 1206 Digi-Key P0.0ECT-ND Resistor, 150 Ω, 1%...
- Page 27 Chapter 3 General High-Speed Amplifier Design Considerations The THS4121 EVM layout has been designed for use with high-speed signals and can be used as an example when designing PCBs incorporating the THS4121. Careful attention has been given to component selection, grounding, power supply bypassing, and signal path layout.
- Page 28 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.
- Page 29 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments THS4121EVM...
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