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Summary of Contents for Texas Instruments THS4082
- Page 1 THS4082 Dual Low Power High Speed Operational Amplifier Evaluation Module User’s Guide September 2000 Mixed-Signal Products SLOU075...
- 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 Trademarks TI is a trademark of Texas Instruments Incorporated. PowerPAD is a trademark of Texas Instruments Incorporated. Chapter Title—Attribute Reference...
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Page 5: Table Of Contents
Running Title—Attribute Reference Contents General ............... . . Feature Highlights . - Page 6 Running Title—Attribute Reference Figures 1–1 THS4082 Evaluation Module ........... 1–2 THS4082 EVM Schematic: Noninverting Operation .
- Page 7 Chapter 1 General This chapter details the Texas Instruments (TI) THS4082 dual high-speed operational amplifier evaluation module (EVM), SLOP239. It includes a list of EVM features, a brief description of the module illustrated with a pictorial and a schematic diagram, EVM specifications, details on connecting and using the EVM, and discussions on high-speed amplifier design and thermal considerations.
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Page 8: Feature Highlights
Feature Highlights 1.1 Feature Highlights THS4082 dual high-speed operational amplifier EVM features include: High Bandwidth: 75 MHz, –3 dB at 15 V & Gain = 2 5-V to 15-V Operation Noninverting Single-Ended Inputs: Inverting-Capable Through Com- ponent Change Module Gain Set to 2 (Noninverting): Adjustable Through Component Change Nominal 50- Impedance Inputs and Outputs Standard SMA Input and Output Connectors... -
Page 9: General
Description 1.2 Description The TI THS4082 dual high-speed operational amplifier evaluation module (EVM) is a complete dual high-speed amplifier circuit. It consists of the TI THS4082 dual low-noise high-speed operational amplifier IC, along with a small number of passive parts, mounted on a small circuit board measuring approximately 1.9 inch by 2.2 inch (Figure 1–1). -
Page 10: Ths4082 Evm Noninverting Operation
THS4082 EVM Noninverting Operation 1.3 THS4082 EVM Noninverting Operation The THS4082 EVM is shipped preconfigured for dual-channel noninverting operation, as shown in Figure 1–2. Note: Compensation capacitors C3 and C6 are not installed. Figure 1–2. THS4082 EVM Schematic: Noninverting Operation –VCC –VCC +VCC... -
Page 11: Ths4082 Evm Noninverting Operation
THS4082 EVM Noninverting Operation Any of the resistors on the EVM board can be replaced with a resistor of a different value; however, care must be taken because the surface-mount solder pads on the board are somewhat fragile and will not survive many desoldering/soldering operations. -
Page 12: Using The Ths4082 Evm In The Noninverting Mode
Using the THS4082 EVM in the Noninverting Mode 1.4 Using the THS4082 EVM in the Noninverting Mode The THS4082 EVM operates from power-supply voltages ranging from 5 V to 15 V. As shipped, the EVM is configured for noninverting operation and the gain is set to 2. -
Page 13: Ths4082 Evm Inverting Operation
THS4082 EVM Inverting Operation 1.5 THS4082 EVM Inverting Operation Although the THS4082 EVM is shipped preconfigured for dual-channel noninverting operation, it can be reconfigured for inverting operation by making the following component changes: 1) Move resistor R3 to the R2 location and R5 to the R4 location on the board. 2) Move resistor R11 to the R10 location and R13 to the R12 location on the board. - Page 14 THS4082 EVM Inverting Operation The gain of the EVM can easily be changed to support a particular application by simply changing the ratio of resistors R6 and R4 (channel 1) and R14 and R12 (channel 2) as described in the following equation: –R + –R6 and –R14...
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Page 15: Using The Ths4082 Evm In The Inverting Mode
Using the THS4082 EVM in the Inverting Mode 1.6 Using the THS4082 EVM in the Inverting Mode The THS4082 EVM operates from power-supply voltages ranging from 5 V to 15 V. As shipped, the EVM is configured for noninverting operation. Move the resistors as detailed above to configure the EVM for noninverting operation, which sets the gain to –1. -
Page 16: Ths4082 Evm Differential Input
THS4082 EVM Differential Input 1.7 THS4082 EVM Differential Input The THS4082 EVM is shipped preconfigured for dual-channel, single-ended noninverting operation. It can be reconfigured for single-channel, differential operation, either noninverting or inverting. 1.7.1 Differential Input, Noninverting Operation Configure the THS4082 EVM for differential noninverting operation by removing two resistors and adding a resistor on the board: 1) Remove resistors R1 and R9. -
Page 17: Differential Input, Inverting Operation
THS4082 EVM Differential Input The gain of the EVM can easily be changed to support a particular application by simply changing the ratio of resistors R6 and R5 (channel 1) and R14 and R13 (channel 2) as described in the following equation: + 1 ) R6 and 1 ) R14 Noninverting Gain + 1 ) -
Page 18: Ths4082 Evm Schematic: Differential Input (Inverting Operation)
THS4082 EVM Differential Input Figure 1–5. THS4082 EVM Schematic: Differential Input (Inverting Operation) –VCC –VCC +VCC +VCC 6.8 F 6.8 F +VCC 0.1 F U1:A VIN1 – THS4082 49.9 VOUT1 0.1 F –VCC U1:B VIN2 – THS4082 49.9 VOUT2 The gain of the EVM inputs can easily be changed to support a particular application by simply changing the ratio of resistors R6 and R4 (channel 1) and R14 and R12 (channel 2) as described in the following equation: –R... - Page 19 THS4082 EVM Differential Input Any of the resistors on the EVM board can be replaced with a resistor of a different value; however, care must be taken because the surface-mount solder pads on the board are somewhat fragile and will not survive many desoldering/soldering operations.
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Page 20: Using The Ths4082 Evm With Differential Inputs
Using the THS4082 EVM With Differential Inputs 1.8 Using the THS4082 EVM With Differential Inputs The THS4082 EVM operates from power-supply voltages ranging from 5 V to 15 V. Move resistors on the board as detailed above for either noninverting or inverting operation to configure the EVM for differential input operation. -
Page 21: Ths4082 Evm Performance
THS4082 EVM Performance 1.10 THS4082 EVM Performance Figure 1–6 shows the typical frequency response of the THS4082 EVM using the noninverting configuration (G = 2). Typical – 0.1 dB bandwidth is 22 MHz and – 3-dB bandwidth is 75 MHz with both a 15-V power supply and a 5-V power supply. -
Page 22: General High-Speed Amplifier Design Considerations
General High-Speed Amplifier Design Considerations 1.11 General High-Speed Amplifier Design Considerations The THS4082 EVM layout has been designed and optimized for use with high-speed signals and can be used as an example when designing THS4082 applications. Careful attention has been given to component selection, grounding, power supply bypassing, and signal path layout. -
Page 23: General Powerpad Design Considerations
General PowerPADE Design Considerations 1.12 General PowerPAD Design Considerations The THS4082DGN IC is mounted in a special package incorporating a thermal pad that transfers heat from the IC die directly to the PCB. The PowerPAD package is constructed using a downset leadframe. The die is mounted on the leadframe but is electrically isolated from it. -
Page 24: Maximum Power Dissipation Vs Free-Air Temperature
General PowerPADE Design Considerations 8) With these preparatory steps in place, the THS4082DGN IC is simply placed in position and run through the solder reflow operation as any standard surface-mount component. This results in a part that is properly installed. The actual thermal performance achieved with the THS4082DGN in its PowerPAD package depends on the application. - Page 25 175-MHz Low-Power High-Speed Amplifiers data sheet (literature number SLOS274). For more general information on the PowerPAD package and its thermal characteristics, see the Texas Instruments Technical Brief, PowerPAD Thermally Enhanced Package (literature number SLMA002) and the PowerPad Made Easy application brief (literature number SLMA004).
- Page 26 1-20 General...
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Page 27: Reference
Chapter 2 Reference This chapter includes a complete schematic, parts list, and PCB layout illustrations for the THS4082 EVM. Topic Page THS4082 EVM Complete Schematic ......2–2 THS4082 Dual High-Speed Operational Amplifier EVM Parts List 2–3... -
Page 28: Ths4082 Evm Schematic
THS4082 EVM Complete Schematic 2.1 THS4082 EVM Complete Schematic Figure 2–1 shows the complete THS4082 EVM schematic. The EVM is shipped preconfigured for dual-channel, single-ended inverting operation. Components showing a value of X are not supplied on the board, but can be installed by the user to reconfigure the EVM for noninverting and/or differential operation. -
Page 29: Ths4082 Evm Parts List
THS4082 Dual High-Speed Operational Amplifier EVM Parts List 2.2 THS4082 Dual High-Speed Operational Amplifier EVM Parts List Table 2–1. THS4082 EVM Parts List Manufacturer/Supplier Reference Description Size Part Number C1, C2 Capacitor, 6.8 F, 35 V, Tantalum, SM Sprague 293D685X9035D2T C4, C5 Capacitor, 0.1 F, Ceramic, 10%, SM 1206... -
Page 30: Ths4082 Evm Component Placement Silkscreen And Solder Pads
THS4082 EVM Board Layouts 2.3 THS4082 EVM Board Layouts Board layout examples of the THS4082 EVM PCB are shown in the following illustrations. They are not to scale and appear here only as a reference. Figure 2–2. THS4082 EVM Component Placement Silkscreen and Solder Pads –VCC +VCC VOUT1... -
Page 31: Ths4082 Evm Pc Board Layout: Component Side
THS4082 EVM Board Layouts Figure 2–3. THS4082 EVM PC Board Layout: Component Side Reference... -
Page 32: Ths4082 Evm Pc Board Layout: Back Side
THS4082 EVM Board Layouts Figure 2–4. THS4082 EVM PC Board Layout: Back Side Reference...
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