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Summary of Contents for Texas Instruments VCA8613EVM
- Page 1 VCA8613EVM Evaluation Module User’s Guide High-Speed Communications June 2004 SBOU021...
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Page 2: Important Notice
TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions:... -
Page 3: Evm Important Notice
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 2004, Texas Instruments Incorporated...
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Page 5: Read This First
Related Documentation From Texas Instruments The following documents provide information regarding Texas Instrument inte- grated circuits used in the assembly of the VCA8613EVM. These documents are available from the TI web site. The last character of the literature number corresponds to the document revision, which is current at the time of the writing of this user’s guide. - Page 6 If you have questions regarding either the use of this evaluation module or the information contained in the accompanying documentation, please contact the Texas Instruments Product Information Center at (972) 644−5580 or visit the TI Semiconductor Online Technical Support pages at http://www.ti.com.
- Page 7 VCA8613EVM The VCA8613EVM is designed to assist with evaluating the performance of the VCA8613 variable gain amplifier. Topic Page Description ........... . .
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Page 8: Initial Configuration
Windows2000 and its operation has been verified with Windows XP, Windows2000, and Windows98. Direct-Control mode uses external control and data signals to control the functions of the VCA8613. The VCA8613EVM has the following features: Easy testing of the VCA8613 Single-ended input... - Page 9 TGC Outputs The differential TGC outputs are buffered by op amps (OPA690) in a differen- tial configuration with a differential gain of 1. When testing the VCA8613EVM, outputs J28 through J35 (TGC outputs) must be terminated into 50Ω loads such as those of a spectrum analyzer. This termination will result in the proper matching for the output amplifiers, and no loss will have to be taken into ac- count.
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Page 10: Modes Of Operation
PC software. Modes of Operation There are three modes of operation for the VCA8613EVM: Stand-Alone, PC- Control, and Direct-Control. The first two modes are accessed by using the S1 switches and the S2 pushbutton. S2 is used as the reset button to make pro- gram changes on the microcontroller. - Page 11 When the S1 switches are set to PC-Control mode, the VCA8613 is controlled by the software running on a PC. At this point, the serial cable included with the VCA8613EVM must be connected to the PC serial port. The program then sets the proper baud rate for communication with the VCA8613EVM.
- Page 12 VCA8613EVM Full-Access Software Loading the software Insert the CD−ROM included with the VCA8613EVM into the appropriate CD−ROM drive on your PC and double click on Install.exe. By using a PC to control the VCA8613, the entire device functionality is avail- able for testing.
- Page 13 VCA8613EVM Full-Access Software Figure 4. Selecting a COM Port Select a COM port from the list. The program lists all available COM ports to choose from. Once a COM port is selected, the main program window will open, as shown in Figure 5.
- Page 14 VCA8613EVM Full-Access Software The main program window allows the user to choose the VCA8613 mode of operation. TGC Mode or CW Mode must be selected before any of the corre- sponding options can be selected, including the Chip Power option. The Chip Power option is set by default to the chip being powered up.
- Page 15 VCA8613EVM Full-Access Software When the VCA8613EVM is controlled by the software, any input to the VCA8613 can be routed to any of the CW outputs via the CW Options selec- tions. Each input channel is listed with a pull-down menu to select any of the ten available outputs (CW0 to CW9) or the Overflow option, which effectively disables the channel.
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Page 16: Schematic And Pcb Layout
Schematic and PCB Layout Schematic and PCB Layout Figure 8. VCA8613EVM Schematic... - Page 17 Schematic and PCB Layout Figure 9. VCA8613EVM Schematic—CW Output VCA8613EVM...
- Page 18 Schematic and PCB Layout Figure 10. VCA8613EVM Schematic—Input/Output Circuitry...
- Page 19 Schematic and PCB Layout Figure 11. VCA8613EVM PCB Top Layer VCA8613EVM...
- Page 20 Schematic and PCB Layout Figure 12. VCA2614/18EVM PCB Ground Layer...
- Page 21 Schematic and PCB Layout Figure 13. VCA2614/18EVM PCB Power Layer VCA8613EVM...
- Page 22 Schematic and PCB Layout Figure 14. VCA2614/18EVM PCB Bottom Layer...
- Page 23 Bill of Materials VCA8613EVM...
- Page 24 Bill of Materials...
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