Texas Instruments VCA8500BOARD User manual

User's GuideSLOU216 – January 2008
VCA8500BOARD
The Texas Instruments VCA8500BOARD evaluation module makes it easy to evaluate the performance ofthe TI VCA8500 variable gain amplifier. This user's guide provides a description of the evaluation moduleand its operation, schematic diagram, bill of materials, and the printed-circuit board layout.
Contents1 Description .................................................................................................................... 22 Initial Configuration .......................................................................................................... 22.1 Power Supply ........................................................................................................ 23 Signals ........................................................................................................................ 23.1 Input Signals ......................................................................................................... 23.2 Output Signals....................................................................................................... 23.3 TGC Outputs ........................................................................................................ 23.4 CW Outputs.......................................................................................................... 34 Microcontroller ................................................................................................................ 35 Modes of Operation ......................................................................................................... 35.1 Default-Power-Up Mode ........................................................................................... 35.2 PC Control Mode ................................................................................................... 45.3 Direct Control Mode ................................................................................................ 46 VCA8500BOARD Full-Access Software .................................................................................. 46.1 Loading the Software ............................................................................................... 46.2 Initial Start-up Screen .............................................................................................. 46.3 Other Program Functions .......................................................................................... 77 Printed-Circuit Board Layout, Bill of Materials, and Schematic ........................................................ 77.1 Printed-Circuit Board Layout ...................................................................................... 77.2 Bill of Materials .................................................................................................... 117.3 Schematic .......................................................................................................... 13
List of Figures
1 CW Output Circuit ........................................................................................................... 32 Initial Start-up Screen ....................................................................................................... 43 Main Program Window ...................................................................................................... 54 CW Options Selection ....................................................................................................... 65 Silkscreen — Top Layer .................................................................................................... 76 Ground ........................................................................................................................ 87 Power Plane 1 ................................................................................................................ 88 Power Plane 2 ................................................................................................................ 99 Ground ....................................................................................................................... 1010 Silkscreen — Bottom Layer ............................................................................................... 11
List of Tables
1 Bill of Materials ............................................................................................................. 11
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1 Description
2 Initial Configuration
2.1 Power Supply
3 Signals
3.1 Input Signals
3.2 Output Signals
3.3 TGC Outputs
Description
The Texas Instruments VCA8500BOARD evaluation module makes it easy to evaluate the performance ofthe VCA8500 variable gain amplifier. The evaluation module operates in three modes: Default Power Up,PC Control, and Direct Control. Default-Power-Up mode does not require any external clocking or datainput to enable the operation of the VCA8500. The functionality in Default-Power-Up mode is limited tofactory-programmed modes. PC-Control mode uses the included software to operate all of the functions ofthe VCA8500. The software was written on Windows™ XP and its operation has been verified withWindows™ XP. Direct-Control mode uses external control and data signals to control the functions of theVCA8500.
The VCA8500BOARD has the following features:•Easy testing of the VCA8500•Single-ended input•Three modes of operation:– Default Power Up– PC Control– Direct Control
The VCA8500BOARD has provisions for six separate power supplies:•+5 V: Positive VCA Supply– This positive 5 V supplies the CW and VCA circuits. (P2)•+3.3 V: Positive VCA Supply– This positive 3.3 V supplies the LNA, Digital circuit and VCA Outputs . Ensure that all three pads ofW1 solder jumper are shorted. (P2)•+5 V/–5 V: Supplies for all other circuitry– These supplies all other +5 V/-5 V requirements onboard. (P4)•+15 V/–15 V: Supplies for CW Amplifiers– These supplies are optional for the CW amplifiers only. To drive these amplifiers with +15 V/–15 V,W2 and W3 solder jumpers should be open. (P3)
The input signals are applied to SMA connectors J1 to J8. The input impedance of the VCA is 8 k Ω. Theinputs are ac-coupled into the LNA of the VCA8500 through 1- µF capacitors and do not attenuate theinput signal.
The outputs of the evaluation module are located at SMA connectors J21 through J28 for the TGCoutputs, and J10 to J19 for the CW outputs. The outputs from the VCA8500 are buffered with operationalamplifiers.
The differential TGC outputs are buffered by operational amplifiers (OPA842) in a differential configurationwith a differential gain of 1. When testing the VCA8500BOARD, outputs J21 through J28 (TGC outputs)must be terminated into 50- Ωloads such as those of a spectrum analyzer. This termination results in theproper matching for the output amplifiers, and no loss has to be taken into account.
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3.4 CW Outputs
THS4021
+2.5V
Not
Installed
0W
100W
6.3kW
220mH
0.1mF
0.01mF
50W
VCA85XX CW Output
+2.5V
I in
Not
Installed
0.1mF
4 Microcontroller
5 Modes of Operation
5.1 Default-Power-Up Mode
Microcontroller
Figure 1 shows the CW output circuit. This circuit is duplicated for each CW output.
Figure 1. CW Output Circuit
The CW outputs are current outputs and require a current-to-voltage conversion in order to view theoutputs with an oscilloscope or spectrum analyzer. The THS4021 operational amplifier is used as thecurrent-to-voltage converter.
When using the VCA8500, the CW outputs need a compliance voltage of +2.5 V. The circuit in Figure 1shows how the compliance voltage is applied to the VCA8500 device through a 220- µH inductor. The CWoutput circuit allows the noise of the CW path to be measured. This configuration is the reason for thelarge feedback resistor in the output amplifier circuit. Before summing more than two CW channels,ensure that the output amplifier does not exceed its maximum output capability. To increase the outputcapability of the THS4021 ensure that W2 and W3 are open and supply ±15 V to P3.
The VCA8500BOARD contains a microcontroller to access internal functions. The microcontroller providesthe evaluation module the ability to be controlled by software running on a PC. The microcontroller is runfrom its own internal oscillator set to 12 MHz. The only external clock signals are those used tocommunicate to the VCA8500 via the serial data clock line, and the embedded clock signal in the RS-232communications circuit. The RS-232 clock operates only when data is being sent from the personalcomputer (PC) to the microcontroller. The serial communication from the PC to the microcontroller is set to19200 kbps. This baud rate is set internally on the microcontroller and is configured automatically in thePC software.
The three modes of operation for the VCA8500BOARD are Default Power Up, PC Control, andDirect-Control.
If no external source or PC control is available, the VCA8500 powers up in a default mode, which sets theVCA8500 to TGC mode with these settings, PGA Gain 20 dB, Clamp Level Disabled, and Filter Bandwidth15 MHz.
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5.2 PC Control Mode
5.3 Direct Control Mode
6 VCA8500BOARD Full-Access Software
6.1 Loading the Software
6.2 Initial Start-up Screen
VCA8500BOARD Full-Access Software
This mode requires P10 to be shorted using surface-mount jumpers. This allows the VCA to interface withthe microcontroller. Switch S1 is not installed, and the settings are hard-wired to PC-Control mode. TheVCA8500 is controlled by the software running on a PC. At this point, the serial cable included with theVCA8500BOARD must be connected to the PC serial port. The program called VCA8500EVM then setsthe proper baud rate for communication with the VCA8500BOARD. By using a PC to control theVCA8500, the entire device functionality is available for testing. The software provides the ability to selectany of the clamp ranges and PGA gains settings, direct an input to any CW output, or power down thecomplete chip.
Remove solder jumpers from P10, and connect the external source to DIN, CLK, DOUT, and CS. Theseare SMA connectors J30, J31, J32, and J33, respectively. This allows for direct control of the VCA8500with an external control source such as a digital word generator.
The CD-ROM includes full-access installation software, data sheet, and EVM schematic
Insert the CD-ROM into the PC. Select the folder called Installation Software, and double-click onSetup.exe. The installation wizard guides you through the rest of the installation process.
Figure 2 shows the initial start-up screen.
Figure 2. Initial Start-up Screen
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VCA8500BOARD Full-Access Software
If COM1 is used, then click the Click to continue box. Otherwise, select the correct COM port from the listthat the program provided prior to selecting the continue box.
Figure 3. Main Program Window
The main program window allows the user to choose the mode of operation. Figure 3 displays the defaultprogram settings. In order to activate these settings, click Download. When Reset is selected, all optionsare set to these same default settings. The Chip Power option only affects the VCA8500 and no other ICon the evaluation board. If TGC mode is selected, the Clamp Level,Filter Bandwidth, and PGA Gainoptions become available. If CW mode is selected, the CW options become available.
When the selections have been made, click Download to send the data to the VCA8500 in this case.
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VCA8500BOARD Full-Access Software
When the VCA8500BOARD is controlled by the software, any input to the VCA8500 can be routed to anyof the CW outputs via the CW Options selections. Each input channel is listed with a pull-down menu toselect any of the ten available outputs (CW0 to CW9) or the Overflow option, which effectively disables thechannel. Figure 4 shows this process.
Figure 4. CW Options Selection
Once all the selections have been made, click Download to send the data to the VCA8500. It is possible,because of the flexible nature of the software, to direct all inputs to one output. This is permissible and canbe supported as long as the output amplifiers in the CW current-to-voltage converters are driven with a±15-V supply (P3); also, W2 and W3 need to be open. The maximum output current from one inputchannel is 3 mA.
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6.3 Other Program Functions
7 Printed-Circuit Board Layout, Bill of Materials, and Schematic
7.1 Printed-Circuit Board Layout
Printed-Circuit Board Layout, Bill of Materials, and Schematic
The EVM software is available on the Texas Instruments Web site, ti.com , by looking in the VCA8500product folder in the Tools and Software section.
Selecting the Exit command button exits the program. The Help pull-down menu contains information onthe program and support information.
This section provides the printed-circuit board layout, the bill of materials, and the schematics.
Figure 5. Silkscreen — Top Layer
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Printed-Circuit Board Layout, Bill of Materials, and Schematic
Figure 6. Ground
Figure 7. Power Plane 1
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Printed-Circuit Board Layout, Bill of Materials, and Schematic
Figure 8. Power Plane 2
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Printed-Circuit Board Layout, Bill of Materials, and Schematic
Figure 9. Ground
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7.2 Bill of Materials
Printed-Circuit Board Layout, Bill of Materials, and Schematic
Figure 10. Silkscreen — Bottom Layer
Table 1. Bill of MaterialsItem Qty Mfg Mfg Part# Ref Des Description Value or Function
REF – VCA85XXB – ASSEMBLY –
REF – VCA85XXB – SCHEMATIC –
1 XX VCA85XXB – FABRICATION –
REF – VCA85XXB – ARTWORK –
1 19 Kemet C0402C103K3RAC C25, C26, C35, C36, C49, Capacitor, SMT, 0402 Capacitor, SMT, 0402,CER, 0.01 µF,C50, C63, C64, C77, C78, 25V, 10%, X7RC92, C106, C125, C132,C139, C156, C162, C172,C179
2 75 Kemet C0402C104K8PAC C18–C20, C22,–C24, Capacitor, SMT, 0402 Capacitor, SMT, 0402, CER, 0.1 µF,C27–C34, C39–C42, 10V, 10%, X5RC45–C48, C51, C52, C55,C56, C59–C62, C65–C68,C73–C76, C79–C82,C87–C89, C94, C95–C99,C101, C108, C110, C112,C117, C120, C124, C128,C129, C134–C136, C143,C146, C147, C150, C155,C163, C164, C166–C168,C175, C176, C181
3 8 TDK C1005X5R0J105M C97, C102, C116, C122, Capacitor, SMT, 0402 Capacitor, SMT, 0402, CER, 1.0 µF,C145, C151, C165, C173 6.3V, 20%, X5R
4 10 Panasonic ECJ-0EC1H100D C1–C10 Capacitor, SMT, 0402 Capacitor, SMT, 0402,CER, 10pF, 50V,Not Installed ±0.5pF, NPO
5 8 Panasonic ECJ-0EC1H470J C91, C105, C123, C131, Capacitor,SMT,0402 Capacitor, SMT, 0402, CER, 47pF,Not Installed C138, C154, C171, C178 50V, 5%, NPO
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Printed-Circuit Board Layout, Bill of Materials, and Schematic
Table 1. Bill of Materials (continued)Item Qty Mfg Mfg Part# Ref Des Description Value or Function
6 20 Kemet C0603C225K9PAC C100, C104, C107, C111, Capacitor, SMT, 0603 Capacitor, CER, SMT, 0603, 2.2 µF,C113–115, C118, C119, 6.3V, X5R, 10%C127, C142, C144, C148,C149, C152, C157, C158,C160, C161, C169
7 16 Kemet C0603C103J5RAC C90, C93, C103, C109, C121, Capacitor, SMT, 0603 Capacitor, CER, COG/NPO, 50V, 5%,C126, C130, C133, C137, 0.01 µFC141, C153, C159, C170,C174, C177, C180
8 8 Sprague SPR595D156X9016B C11–C17, C21 Capacitor, SMT Ceramic capacitor, SMT, 1210, 15 µF,16V, 10%, X5R
9 1 Not Installed D1833400 BB Clamp Clamp Clamp, PAP64, 10X10, Tucson, 166mils HOLE 4PL
10 33 Johnson 142-0701-201 J1-IN1, J2-IN2, J3-IN3, CON, SMA, THU SMA coax straight PCB JackComponents J4-IN4, J5-IN5, J6-IN6, receptacle, 155TL, BRASS/GOLDJ7-IN7, J8-IN8, J15-CW5,J16-CW6, J17-CW7,J18-CW8, J19-CW9,J14-CW4, J13-CW3,J12-CW2, J11-CW1,J10-CW0, J21-OUT1,J22-OUT2, J23-OUT3,J24-OUT4, J28-OUT8,J27-OUT7, J26-OUT6,J25-OUT5, J20-SUM,J29-PD, J30-DIN, J31-CLK,J32-DOUT, J33- CS, J9 Vcntrl
11 1 AMP 745781-4 P7 CONN, DSUB, 9P DSUB, 9 Pin, R/A FEM
12 1 Molex 015-19-0080 P10 CONN, SMT, 8P Header, SMT, 8P, Dual row, 0.1LS,Not Installed Vertical, C-GRID
13 1 C&K BD04 S1 DIP Switch, Thu, DIP-8 DIP Switch, THU, 8 Pins,SPSTx4,Not Installed 100LS
14 1 TI VCA8500 DUT_VCA85XX DUT, SMT, QFN-64 DUT, SMT, QFN, RGC-64, 0.5mm LS,9x9x1mm, THRM.PAD
15 4 Samtex TSW-106-05-G-S P2–P4, P6 Header, THU, 6P Header 1X6 .1CTR
16 1 Maxim MAX3221CAE U21 IC, SMT, 16P RS-232 Transceivers
17 10 TI THS4021CD U1–U10 IC, SMT, 8P 420 MHz High speed current feedbackAMP
18 1 TI REG104GA-2.5G4 U23 IC, SMT, SOT223-6EP 2.5V, DMOS 1A Low-dropout regulator
19 1 TI REG104GA-3.3 U20 IC, SMT, SOT223-6EP 3.3V, DMOS 1A Low-dropout regulator
20 8 TI / OPA842IDBV U11–U18 IC, SMT, SOT23-5 Wideband, LOW DIST, Unity-gainBurr-Brown stable, voltage-feedback OP AMP
20B 1 TI / OPA820IDBV U19 IC, SMT, SOT23-5 Wideband, LOW DIST, Unity-gainBurr-Brown stable, voltage-feedback OP AMP
21 1 Cypress CY8C2633-24PVXI U22 IC, SMT, SSOP-20 CYPRESS PSoC Mixed-signal array
22 10 Panasonic ELJFA221J L1–L10 Inductor, SMT 220 µH, 5%
23 1Panasonic EVQPE104K S2 Jumper, THRU, 2P Square light touch switch, SMT, SPST,Parts on High-density, space savingOrder
Not Installed
24 2 Solder JUMPER-0402 W2, W3 Solder jumper, SMT, 2P, Jumper, SMT0402Shorted 0402
25 1 Solder Short JUMPER-0402-3P W1 Solder jumper, SMT, 3P Short all 3 pads3 pads
26 26 Vishay CRCW0402000Z R9, R10, R27, R28, R55, RES, SMT, 0402 RES, SMT, 0402, 1/16W, 0 ΩR56, R77, R78, R105, R106,R124, R127, R134, R138,R148, R153, R157, R160,R164, R167, R182, R187,R196, R200, R205, R208
26B 26 Vishay CRCW0402000Z R7, R8, R15–R22, R25, R26, RES, SMT, 0402 RES, SMT, 0402, 1/16W, 0 ΩNot Installed R47, R48, R75, R76, R101,R102
27 10 Vishay/Dale CRCW04021000F100 R3, R4, R13, R14, R41, R42, RES, SMT, 0402 RES, SMT, 100 Ω, 1/16W, 1%, 100ppmR69, R70, R97, R98
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7.3 Schematic
Printed-Circuit Board Layout, Bill of Materials, and Schematic
Table 1. Bill of Materials (continued)Item Qty Mfg Mfg Part# Ref Des Description Value or Function
28 1 Vishay/Dale CRCW04021001F100 R195 RES, SMT, 0402 RES, SMT, 1k Ω, 1/16W, 1%, 100ppm
29 5 Vishay/Dale CRCW04024701F100 R140–R143, R185 RES, SMT, 0402 RES, SMT, 4.7 k Ω, 1/16W, 1%,100ppm
30 20 Vishay/Dale CRCW040249R9F100 R5, R6, R23, R24, R43, R44, RES, SMT, 0402 RES, SMT, 49.9 Ω, 1/16W, 1%,R71, R72, R99, R100, R126, 100ppmR137, R151, R159, R166,R184, R190, R191, R198,R207
31 16 Vishay/Dale CRCW04021001F100 R123, R125, R131, R135, RES, SMT, 0402 RES, SMT, 0402, 1k Ω, 1%, 1/16WR145, R149, R156, R158,R163, R165, R171, R183,R192, R197, R204, R206
32 9 Panasonic ERJ-2RKF4020X R173–R181 RES, SMT, 0402 RES, SMT, 0402, 402 Ω, 1%, 1/16W
33 10 Panasonic ERJ-2RKF6341X R1, R2, R11, R12, R37, R38, RES, SMT, 0402 RES, SMT, 0402, 6.34 k Ω, 1%, 1/16WR61, R62, R89, R90
34 16 Vishay/Dale CRCW0402499RFKED R128, R129, R139, R144, RES, SMT, 0402 RES, SMT, 0402, 499 Ω, 1%, 1/16WR154, R155, R161, R162,R168, R169, R188, R189,R201, R202, R209, R210
35 9 1902D STANDOFFS Hex 4-40 With 1/4" 4-40 Screws
SPECIAL NOTES AND INSTRUCTIONS
Notes: 1) Line items 4, 5, 9, 12, 13, 23, 26B – Components are not installed.
2) Line items 24 and 25 – W1 Short all three pads. Short W2 and W3.
3) Line item 20B – U19 Use OPA820 in place of the OPA642
The schematic drawings appear on the following page.
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EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents orservices described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety programs, please contact the TI application engineer or visit www.ti.com/esh .No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 0 V to 1.4 V and the output voltage range of -4 V to 4 V.Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questionsconcerning the input range, please contact a TI field representative prior to connecting the input power.Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than 50 °C. The EVM is designed to operateproperly with certain components above 50 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing the 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.
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