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February 2001 Mixed-Signal Products User ’ s Guide SLOU106.
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 THS4140 evaluation module (EVM) helps designers evaluate the performance of the THS4140 operational amplifier . Also, this EVM is a good example of high-speed PCB design.
Description 1-2 Introduction and Description 1.1 Description The THS4140 EVM is a good example of PCB design and layout for high-speed operational amplifier applications.
THS4140 EVM Specifications 1-3 Introduction and Description 1.3 THS4140 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) . . . . . . . . . . . . . . . .
THS4140 EVM Schematic 1-4 Introduction and Description 1.5 THS4140 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 + – THS4140 – + 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.
THS4140 EVM Layout 1-7 Introduction and Description 1.7 THS4140 EVM Layout Figure 1–7. T op Layer (Silkscreen) TEXAS INSTRUMENTS THS4140 EVM REV_B Figure 1–8.
THS4140 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).
THS4140 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 THS4140 EVM Using the THS4140 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 THS4140 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 THS4140 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 THS4140 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 THS4140 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 THS4140 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.
THS4140 EVM Bill of Materials 2-7 Using the THS4140 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.
THS4140 EVM Bill of Materials 2-8 Using the THS4140 EVM T able 2–1. THS4140 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 THS4140 EVM layout has been designed for use with high-speed signals and can be used as an example when designing PCBs incorporating the THS4140.
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 .
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