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User’s Guide
February 2001 Mixed-Signal Products
SLOU108
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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 infri
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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 amplifier PCB is an elegant and sensitive process. Therefore, the user must approach the PCB design with care and awareness. It is recommend that the user initially review the d
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Related Documentation From Texas Instruments 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 a situation that could potentially cause harm to you. The information in a caution or a warning is provided for your protection. Please read each caution
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Running Title—Attribute Reference Contents 1 Introduction and Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Evaluation Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.3 THS4150 EVM Specifications . .
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Running Title—Attribute Reference 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-Differential Out, Without Transformer . . . . . . . . . . . . . . . . . . . . . . 1-5 1–4 Fully-Differential In/Fully-Differential Out, Utilizing Transformer . . . . .
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Chapter 1 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 features, a brief description of the module illustrated with a series of schematic diagrams, EVM specifications, details on connect
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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. The board measures 4.5 inches in length by 2.5 inches
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THS4150 EVM Specifications 1.3 THS4150 EVM Specifications Supply voltage range, ±V . . . . 5 V to ±15 V (see the device data sheet) CC Supply current, I . . . . . . . . . . . . . . . . . . . . . . . . (see the device data sheet) CC Output drive, I V = ±15 . . . . . . . . . . . . . . . . . (see the device data sheet) O, CC For complete THS4150 amplifier IC specifications, parameter measurement information, and additional application information, see the THS4150 data sheet, TI literature number SL
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THS4150 EVM Schematic 1.5 THS4150 EVM Schematic Figure 1–2. Schematic 1-4 Introduction and Description
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Additional Sample Schematics 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 Transformer R6b R3B C4 V CC RX1 R1b 50 W 0 W 0 W R4b Rx4 R10 Source + V – IN 0 W 0 W R16 Termination THS4150 AC Resistor R4a Rx5 Rx6 + – RX2 R1a 0 W 0 W 0 W 0 W V C1 C6 CC– V OCM R6a R3a Note: Fully-differential in / fully-differential out signal path. See th
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Additional Sample Schematics Figure 1–5. VICR Level Shifter R6B 402 W V RPU1 CC RX3 C4 49.9 W V CC 50 W Source RX1 R1b R3b R4b Rx4 R10 + – V 0 W 0 W 49.9 W 0 W 0 W 374 W IN THS4150 AC Rx0 R3a + R4a Rx5 Rx6 – 374 W 24.9 W 0 W 0 W 49.9 W C6 V CC– C1 V OCM RPU2 R6a 402 W Note: 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. Butte
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THS4150 EVM Layout 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 Introduction and Description 1-7
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THS4150 EVM Layout Figure 1–9. Internal Plane (Layer 2) (Ground Plane) Figure 1–10. Internal Plane (Layer 3) (± V Plane) CC 1-8 Introduction and Description
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THS4150 EVM Layout Figure 1–11. Bottom (Layer 4) (Ground and Signal) Introduction and Description 1-9
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1-10 Introduction and Description
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Chapter 2 Using the THS4150 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. Topic Page 2.1 Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2 2.2 Power Supply Setup . . . . . . . . . . . . . . . . . . . . . . . . . .
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2.1 Required Equipment One double-output dc power supply (±5 V, 100 mA output minimum) Two 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 meters which may be applicable to this test. 50-W source impedance function generator (1 MHz, 10 V sine wave) PP Oscilloscope (50-MHz bandwidth minimum, 50-W input impedance)
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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 ) sine wave PP with no dc offset. 3) Turn off the function generator before proceeding to the next step. 4) Using a BNC-to-SMA cable, connect the function generator to J1 (V ) on I+ the EVM. 5) Using a BNC-to-SMA cable, connect the oscilloscope to J3 (V ) on the O– EVM. 6) Using a BNC-to-SMA cable, connect the oscilloscope to J4 (V ) on th
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2.4 Testing the EVM Setup 1) Turn on the dc power supply. 2) Verify 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) Turn on the function generator. 4) Verify the oscilloscope is showing two 1 MHz sine waves with amplitude of ±0.125 V. The dc offset of the signal must be below 50 mV. Note: V and V should
