Texas Instruments VCA8613EVM User Manual Download | Manualshive

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June 2004

User’s Guide

SBOU021

High-Speed Communications

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Summary of Contents for VCA8613EVM

Page 1: ... June 2004 User s Guide SBOU021 High Speed Communications ...

Page 2: ...tute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the third party or a license from TI under the patents or other intellectual property of TI Reproduction of information in TI data books or data sheets is permissible only if reproduction is...

Page 3: ... handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s responsibility to take any and all appropriate 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 A...

Page 4: ... 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 60 C The EVM is designed to operate properly with certain components above 70 C as long as the input and output ranges are maintained These components include but are not limited to linear regulators switching transistor...

Page 5: ...ion module are synonymous with the VCA8613EVM 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...

Page 6: ...est environment only It may generate use or radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to sub part J of part 15 of the FCC regulations which are designed to provide reasonable protec tion against radio frequency interference Operation of this equipment in other environments may cause interference with radio communications in ...

Page 7: ...th evaluating the performance of the VCA8613 variable gain amplifier Topic Page 1 Description 2 2 Initial Configuration 2 3 Signals 3 4 Microcontroller 4 5 Modes of Operation 4 6 VCA8613EVM Full Access Software 6 7 Schematic and PCB Layout 10 8 Bill of Materials 17 ...

Page 8: ...ect 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 Three modes of operation J Stand Alone J PC Control J Direct Control Separately adjustable attenuation and gain ranges in PC Control mode 2 Initial Configuration 2 1 Power Supply The VCA861xEVM has provisions for th...

Page 9: ... 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 3 4 CW Outputs The following diagram shows the CW output circuit This circuit is duplicated for each CW output Figure 1 CW Output Circuit 6 3kΩ 50Ω SMA 100Ω Not Populated IIN 1 2...

Page 10: ...re running on a PC The micro controller is run from its own internal oscillator set to 12MHz The only external clock signals are those used to communicate to the VCA8613 via the serial data clock line for clocking data to the VCA8613 and the embedded clock signal in the RS 232 communications circuit The RS 232 clock operates only when data is being sent from the PC to the microcontroller The seria...

Page 11: ...enerator Resistor pads R6 to R9 are pro vided onboard for termination of the externally provided signals if needed The value of 50Ω can be adjusted to any value that is required by the drive circuitry of the external signals CW modes are documented in Table 2 Table 2 CW Modes Explained Channel In Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 Ch7 Ch8 CW Mode 1 CW 0 CW 1 CW 2 CW 3 CW 4 CW 5 CW 6 CW 7 CW Mode 2 CW 8 CW 9 ...

Page 12: ...software provides the ability to select any of the attenua tion ranges and PGA gains direct an input to any CW output or power down the complete chip Figure 2 through Figure 7 are screen shots from the pro gram with descriptions of how to use each feature 6 2 Initial Startup Screen Figure 2 shows the initial startup screen Figure 2 Initial Startup Screen The Please select a COM port dialog box wil...

Page 13: ...8613EVM 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 Figure 5 Main Program Window ...

Page 14: ... all options are cleared and chip power is set to Chip On The Chip Power option only affects the VCA8613 and no other IC on the evaluation board If TGC Mode is selected the Attenuator and PGA Gain options become avai lable If CW Mode is selected the CW Options become available Figure 6 shows how to select TGC Mode with attenuation set to 33dB and PGA gain set to 26dB Figure 6 Selecting TGC Mode wi...

Page 15: ... made click Download to send the data to the VCA8613 It is possible because of the flexible nature of the software to direct all inputs to one output This is permissible and can be supported as long as the feed back resistors R10 through R19 in the CW current to voltage converters are adjusted The maximum output current from one input channel is 2 66mA The maximum output swing of the OPA690 must b...

Page 16: ...k R 4 4 7k 3 3 Vdd 3 3 Vdd 3 3 Vdd C 4 1 uF C 5 1 u F C 6 1 u F C 7 1 uF C 8 1 uF C 10 1 uF DOUT DIN CLK CS 5VIN C 1 1 u F 3 3 Vdd 5VIN C 2 1 uF 3 Vaa Vin 1 Vout 2 GND 3 NR ADJ 4 Enable 5 GND 6 U1 REG103 33 Vin 1 Vout 2 GND 3 NR ADJ 4 Enable 5 GND 6 U2 REG103 3 C 3 1 uF C 9 1 uF 1 2 3 4 5 6 7 8 J P3 H EADER 4X2 5VIN R 5 4 7 k R 1 0 0 3 Vaa 1 2 3 4 5 J4 5X1X 1 3 3 Vdd Xres Xres CrysIn CrysIn CrysOu...

Page 17: ...1 u F C 4 5 1u F C 1 30 1 u F C 4 4 1u F R23 6 3k C159 0 01uF 1 2 3 4 5 J12 OUT 0 R81 50 5VIN 3 4 1 6 2 dis 5 U8 OPA_690 5VIN C 1 2 1 1 uF C 26 1uF C 1 1 9 1 uF C 25 1uF R22 6 3k C158 0 01uF 1 2 3 4 5 J11 OUT 0 R80 50 5VIN 3 4 1 6 2 dis 5 U7 OPA_690 5VIN C 12 6 1 u F C 3 0 1 uF C 1 18 1 u F C 2 3 1 uF R25 6 3k C161 0 01uF 1 2 3 4 5 J14 OUT 0 R83 50 5VIN 3 4 1 6 2 dis 5 U10 OPA_690 5VIN C 12 7 1 u ...

Page 18: ... t 7 1 2 3 4 5 J19 Inpu t 8 C 33 0 1 uF C 34 0 1 uF C 35 0 1 uF C 36 0 1 uF C 37 0 1 uF C3 8A 0 0 01 uF TP 29 TP 30 TP3 1 TP3 2 T P3 3 TP34 TP35 TP 36 TP 37 T P3 8 T P39 TP 40 T P4 1 TP4 2 TP 43 TP4 4 C39 0 1 uF 1 2 3 4 5 J2 8 O ut 8 1 2 3 4 5 J29 Out 7 1 2 3 4 5 J3 0 O ut 6 1 2 3 4 5 J31 Out 5 1 2 3 4 5 J3 2 O ut 4 1 2 3 4 5 J33 Out 3 1 2 3 4 5 J3 4 O ut 2 1 2 3 4 5 J35 Out 1 R38 50 R4 5 50 R44 5...

Page 19: ...Schematic and PCB Layout 13 VCA8613EVM Figure 11 VCA8613EVM PCB Top Layer ...

Page 20: ...Schematic and PCB Layout 14 Figure 12 VCA2614 18EVM PCB Ground Layer ...

Page 21: ...Schematic and PCB Layout 15 VCA8613EVM Figure 13 VCA2614 18EVM PCB Power Layer ...

Page 22: ...Schematic and PCB Layout 16 Figure 14 VCA2614 18EVM PCB Bottom Layer ...

Page 23: ...10pF C146 C155 805 16 1kΩ R62 R77 805 1 10W 0805 Chip Resistor P1 00KCCT ND Digi Key 38 1µF C94 C101 C116 C145 Capacitor_T491A Low Profile Tantalum Capacitor T491A105M016AS Kemet 5 2 2µF C52 C56 Capacitor_T491A Low Profile Tantalum Capacitor T491A225M016AS Kemet 10 220µH L1 L10 1206 1 4 Position Screw Terminal J1 POWER 4V 4 Terminal Screw Connector ED1516 ND Digi Key 4 4 7kΩ R2 R5 805 1 10W 0805 C...

Page 24: ...R 2 1 MAX3221 U3 JEDEC_MO150_16L IC DRVR RCVR RS 232 1 Channel 16 SSOP 296 9595 1 ND Digi Key 19 OPA_690 U5 U14 U16 U24 SOT23 6 IC OP AMP WDBND VFB DIS SOT23 6 OPA690IDBVTTR ND Digi Key TI 8 R R89 R92 1 R94 R97 1 805 1 REF3012 U25 1 SOT23 1 REG103 3 U2 SOT223 5 3 0V reg REG103GA 3 ND Digi Key 1 REG103 33 U1 SOT223 5 3 3V reg REG103GA 3 3 ND Digi Key 1 SW DIP 3 S1 3POS_SPST_DIP DIP Switch CKN3004 N...

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