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Related Manuals for Texas Instruments THS6043EVM
Summary of Contents for Texas Instruments THS6043EVM
- Page 1 THS6043EVM User’s Guide August 2002 High Performance Linear Products SLOU139...
- Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
- 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 of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
- 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 2002, Texas Instruments Incorporated...
- Page 5 It is recommended that the user initially review the data sheet of the device un- der test. It is helpful to review the schematic and layout of the THS6043EVM to determine the design techniques used in the evaluation board. The design of the high-speed amplifier PCB is a sensitive process. The user must approach high speed PCB design with care and awareness.
- Page 6 Related Documentation From Texas Instruments The URLs below are correct as of the date of publication of this manual. Texas Instruments applications apologizes if they change over time. THS6043 data sheet (literature number SLOS264) Application report (literature number SLMA002), Power Pad Thermally Enhanced Package, http://www−s.ti.com/sc/psheets/slma004/slma002.pdf...
- Page 7 Trademarks Application report (literature number SLOA100), Active Output Imped- ance for ADSL Line Drivers, http://www−s.ti.com/sc/psheets/sloa100/sloa100.pdf Trademarks PowerPAD is a trademark of Texas Instruments.
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Page 9: Table Of Contents
..........THS6043EVM Operating Conditions . - Page 10 5−1 Top Layer 1 of THS6043EVM ...........
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Page 11: Introduction And Description
THS6043 operational amplifier. Also, this EVM is a good example of high-speed PCB design. This document details the THS6043EVM. It includes a list of EVM features, a brief description of the module illustrated with a series of schematic diagrams, EVM specifications, details on connecting and using the EVM, and a discussion of high-speed amplifier design considerations. -
Page 12: Description
Description 1.1 Description The THS6043EVM provides a platform for developing high-speed op amp application circuits. It contains the THS6043 high-speed dual op amp, 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 13: Schematic Of The Populated Circuit On The Evm (Default Configuration)
EVM Default Configuration Figure 1−1. Schematic of the Populated Circuit on the EVM (Default Configuration) OUT1 THS6043 OUT1 − 49.9 W 49.9 W 49.9 W 750 W 100 W 4.99 kW − V THS6043 210 W NC PWP 4.99 kW 1 mF THS6043 750 W... -
Page 15: Using The Ths6043Evm
Chapter 2 Using the THS6043EVM This section describes how to connect the THS6043EVM to test equipment. It is recommended that the user connect the EVM as described in this section to avoid damage to the EVM or the THS6043 installed on the board. -
Page 16: Test Equipment Required
Test Equipment Required 2.1 Test Equipment Required Dual dc output power supply (± 15 V, 200 mA output minimum) Two dc current meters with resolution to 1 mA and capable of the maximum current supplied by the dc power source. Note: Some power supplies incorporate current meters which may be applicable to this test. -
Page 17: Signal Connections
+V CC OSCILLOSCOPE FUNCTION GENERATOR THS6043 EVM IN 1 EDGE #6438959 1 MHz 5 V PP OUT 1 0 V Offset JP 2 CH-1 CH-2 JP 1 50 Ohm Source IN 2 Impedance OUT 2 50 Ohm Impedance Using the THS6043EVM... - Page 19 Chapter 3 THS6043EVM Applications Example applications are presented in this chapter. These applications demonstrate the most popular circuits to the user, but many other circuits can be constructed. The user is encouraged to experiment with different circuits, exploring new and creative design techniques. That, after all, is the function of an evaluation board.
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Page 20: Standard Gain Configuration
Standard Gain Configuration 3.1 Standard Gain Configuration The THS6043EVM default configuration is a fully differential input, fully differential output gain stage as shown in Figure 3−1. This gain is calculated according an equation that is similar to the one that describes an... -
Page 21: Single Supply Operation
Single Supply Operation 3.2 Single Supply Operation Many designs use single supply voltages, and the THS6043EVM allows single supply operation. The THS6043EVM can be reconfigured for single supply operation as shown in Figure 3−2. To convert to single supply operation: Connect ground from the power supply to both J5 (GND) and J4 (−V... -
Page 22: Active Termination
Active Termination 3.3 Active Termination Active termination is a technique that allows the designer to use a small value resistor for the series resistance (R17 or R18). The circuit then uses positive feedback to make the impedance of this resistor appear much larger, when looking from the line side. - Page 23 Where n is the turn ratio of the transformer. The reader is cautioned that active termination is a very complex topic, with many considerations. Carefully read the Texas Instruments application report Active Output Impedance for ADSL Line Drivers, SLOA100 to gain a more complete understanding of the topic and all of the subtle implications of active termination.
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Page 24: Snubber Circuit
Snubber Circuit 3.4 Snubber Circuit Figure 3−4. Addition of Snubber Circuit to Active Termination THS6043 Vout+ = RS <<< Zin − 49.9 W 49.9 W = RF 750 W −V = RP V Line Vout+ = 2 RG 210 W Line = 100 W 1 mF... -
Page 25: Receive Path Implementation
ADSL is full duplex. The hybrid cancels out the TX signal and allows the RX signal from the line to come through. The THS6043EVM does not include receive or hybrid circuitry. Texas Instruments assumes that customers prefer to implement their own propriety hybrid design. -
Page 26: High-Pass Filter
This helps (but does not assure) that the signals are truly differential. Figure 3−6 compares the frequency spectrum of ADSL to a simulation of the high-pass filter on the THS6043EVM. Figure 3−6. ADSL Spectrum and High-Pass Filter Response f − Frequency − kHz (Above Not on a Logarithmic Scale) f −... -
Page 27: Noninverting Single-Ended Gain Stages
Noninverting Single-Ended Gain Stages 3.7 Noninverting Single-Ended Gain Stages Although ADSL is the obvious application for the THS6043EVM, it can also be configured for other applications.There are component locations on the EVM that allow various dc- and ac-coupled gain stages to be constructed. -
Page 28: Independent Single-Ended Inverting Gain Stages
Independent Single-Ended Inverting Gain Stages 3.8 Independent Single-Ended Inverting Gain Stages Two independent inverting gain stages can be created by: Removing R7, R23, R24, and C3 Adding zero Ω jumpers at R4 and R14 Jumper pins 1 and 2 of JP1 Adding gain resistors (Rg) at R3 and R15. -
Page 29: Independent Single-Supply Single-Ended Inverting Gain Stages
Normal operation is restored for voltages below 0.8 V on the shutdown (SD) input. When no jumper is installed in position JP2, the SD input is pulled to ground through R26. When a jumper is installed in position JP2, a voltage THS6043EVM Applications 3-11... -
Page 30: Shutdown Operation
Shutdown Operation (Channels 1 and 2) divider is formed by R26 and R27, taking the SD input to +V/2, which disables the outputs of the EVM. Please note that due to the low-value input and feedback resistors, some signal leaks from the inputs to the outputs of the EVM. -
Page 31: High-Speed Amplifier Pcb Layout Tips
Chapter 4 High Speed Amplifier PCB Layout Tips The THS6043EVM layout has been designed for use with high-speed signals and can be used as an example when designing PCBs incorporating the THS6043. Careful attention has been given to component selection, grounding, power supply bypassing, and signal path layout. - Page 32 The printed-circuit board that is used with PowerPAD packages must have features included in the design to remove the heat from the package efficiently. As a minimum, there must be an area of solder-tinned-copper underneath the PowerPAD package. This area is called the thermal land. The thermal land varies in size depending on the PowerPAD package being used, the PCB construction, and the amount of heat that needs to be removed.
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Page 33: Evm Hardware Description
Chapter 5 EVM Hardware Description This chapter describes the EVM hardware. It includes the EVM parts list, and printed circuit board layout. Table 5−1. THS6043EVM Bill of Materials Reference Manufacturer’s Distributor’s Designator Part Number Part Number Item Description Bead, Ferrite, 3A, 80 Ω, SMD... -
Page 34: Top Layer 1 Of Ths6043Evm
Connector, BNC, vertical, PCB J1, J2, J6, J7 (Amphenol) 31−5329 (Allied) 713−7160 (Newark) 89F2885 Standoff, 4−40 hex, 0.625” (Keystone) 1804 (Allied) 839−2089 length Screw, Phillips, 4−40, 0.250” IC, THS6043 PWP (TI) THS6043CPWP PCB, (TI) EDGE #6438959 Figure 5−1. Top Layer 1 of THS6043EVM... -
Page 35: Internal Plane (Layer 2)
Figure 5−2. Internal Plane (Layer 2) EVM Hardware Description... -
Page 36: Internal Plane (Layer 3)
Figure 5−3. Internal Plane (Layer 3) - Page 37 Figure 5−4. Bottom (Layer 4) EVM Hardware Description...
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Page 38: Full Schematic Of The Ths6043Evm
Figure 5−5. Full Schematic of the THS6043EVM OUT1 THS6043 OUT1 − 49.9 W 49.9 W 49.9 W 750 W − V 100 W 4.99 kW 210 W THS6043 4.99 kW 1 mF 750 W THS6043 OUT2 − 49.9 W 49.9 W 49.9 W...
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