User's Guide SLWU058 - August 2008 Voltage-Controlled Amplifier Evaluation Kit The TSW7001 is an evaluation module that demonstrates an ultra-wideband, high-performance, voltage-controllable gain stage with 40 dB of voltage-controlled gain (nominal gain of 100). The demonstration kit includes an optional path for an onboard OPA656 transimpedance input stage, a 16-bit precision voltage DAC8831 to implement the gain control voltage, and the VCA824 ultra-wideband, voltage-controlled amplifier. Also onboard are linear regulators to provide the voltages necessary for the amplifier circuits and a precision 1.2-V reference for the control voltage digital-to-analog converter (DAC). Control of the board is achieved through a USB interface and GUI software. This allows a personal computer to control the gain of the VCA824 without the need for extra signal generators. The control levels can be static voltage levels or dynamically changing waveforms, both selectable from the GUI. Figure 1. TSW7001EVM 1 2 3 4 5 6 7 8 9 10 11 Contents TSW7001EVM Configuration Options .................................................................................... 2 Block Diagrams .............................................................................................................. 3 Key Texas Instruments Components ..................................................................................... 3 Software Installation ......................................................................................................... 4 Software ....................................................................................................................... 4 TSW7001 EVM Introduction .............................................................................................. 11 Demonstration Kit Test Configuration ................................................................................... 12 Initial Power Up and Test ................................................................................................. 14 Optional Configurations.................................................................................................... 14 Bill of Materials and Schematics ......................................................................................... 16 References .................................................................................................................. 21 List of Figures SLWU058 - August 2008 Submit Documentation Feedback Voltage-Controlled Amplifier Evaluation Kit 1 TSW7001EVM Configuration Options 1 2 3 4 5 6 7 8 9 10 11 12 13 14 www.ti.com TSW7001EVM ............................................................................................................... 1 Optional Onboard OPA656 Transimpedance Input Stage.............................................................. 2 TSW7001EVM Block Diagram ............................................................................................. 3 VCA824 Schematic .......................................................................................................... 3 TSW7001 Control Voltage GUI ............................................................................................ 9 TSW7001 Output for Step Function ....................................................................................... 9 TSW7001 Ramp Output ................................................................................................... 10 TSW7001 Arbitrary Gain Profile Panel .................................................................................. 10 Output of TSW7001 With Arbitrary Gain Profile ........................................................................ 11 TSW7001 Test Setup ...................................................................................................... 12 IMD3 Plot for TSW7001 at 10 MHz ...................................................................................... 13 IMD3 for TSW7001 in 40-dB Gain Mode................................................................................ 13 Harmonic Distortion for TSW7001 in 40-dB Gain Mode .............................................................. 14 Optional Path for OPA656 Input Buffer/Transimpedance Amplifier. ................................................. 15 List of Tables 1 2 1 Input and Output Connections ............................................................................................ 11 Bill of Materials ............................................................................................................. 16 TSW7001EVM Configuration Options The TSW7001 evaluation module (EVM) can be configured to have an optional transimpedance input stage using an OPA656 operational amplifier. In the default configuration, the OPA656 is bypassed and the input is directly connected to the input of the VCA824 amplifier. The voltage supplies for the amplifiers also can be optionally configured for external offboard supplies. This section outlines the various components and configurations. 1.1 Board Configuration The EVM is by default configured to bypass the optional input transimpedance gain stage. This stage can be enabled by connecting the SJP5 and SJP6 solder jumpers in the 2-3 position as shown in Figure 2. In this configuration, the transimpedance gain of the OPA656 circuit has to be optimized for the particular input load/sensor input capacitance [see Section 11, Ref 1]. Figure 2. Optional Onboard OPA656 Transimpedance Input Stage. 2 Voltage-Controlled Amplifier Evaluation Kit SLWU058 - August 2008 Submit Documentation Feedback Block Diagrams www.ti.com 1.2 Using External Operational Amplifier Supplies By default both amplifiers are set up to operate with a 5 V. This is adequate in most cases for evaluation purposes; however, both the OPA656 and VCA824 can be operated at a maximum of 6-V supply. Ferrite beads allow the use of a different Vamp supply for both amplifiers, if desired. 2 Block Diagrams 2.1 System Block Diagram Figure 3 shows the functional blocks on the TSW7001 board. The Texas Instruments integrated circuits (IC) are listed on board for reference. Figure 3. TSW7001EVM Block Diagram 3 Key Texas Instruments Components 3.1 VCA824 The VCA824 is a dc-coupled, ultra-wideband, voltage-controlled amplifier with a linear in V/V gain control voltage input to adjust the gain down 40 dB from the nominal gain set by the gain resistor R291 (Rg) and the feedback resistor R302 (Rf). The gain element is isolated from both inputs, permitting gain control shaping techniques to be implemented easily. Both the inverting and noninverting inputs of the VCA824 are high impedance, allowing a simple interface to the prior stage.This EVM has a nominal gain of 100 V/V (40 dB). Typical applications that are well-suited to the VCA824 include differential line receivers, differential equalizers, pulse amplitude compensation, and variable attenuators. More information for the VCA824 is available in the data sheet (SBOS394). For a lower speed VCA, consider the VCA822. For a linear in dB gain adjust range, consider the VCA820 and VCA821. Figure 4. VCA824 Schematic SLWU058 - August 2008 Submit Documentation Feedback Voltage-Controlled Amplifier Evaluation Kit 3 Software Installation 3.2 www.ti.com OPA656 The OPA656 is a wideband, unity-gain-stable, FET-input, voltage-feedback operational amplifier, allowing exceptional performance in high-speed, low-noise applications. Extremely low dc errors give good precision in optical applications. Typical applications for the OPA656 include wideband photodiode amplifiers, sample and hold buffers, CCD output buffers, ADC input buffers, wideband precision amplifiers, and test and measurement front ends. See the data sheet (SBOS196) for more detailed performance and application data. If wider bandwidth is required with the FET input, consider using the OPA657; if lower noise is required, consider the OPA847. 3.3 TPS76xxx, TPS5430, UCC284-5 The TPS76xxx provide 3.3-V and 5-V linear regulation for the DAC5682z, CDCM7005, and V+ amplifier supplies. The TPS5430 generate -5.5 V from 6-V input followed by the UCC284-5, which provides linear -5-V regulation for the V- amplifier supply. 4 Software Installation The CDROM contains an installer that installs the necessary USB drivers and the GUI software to generate the control voltage. 4.1 TSW7001 USB Drivers Execute the TSW7001_setup.exe file. This creates and copies all drivers and GUI files to the directory C:\Program Files\Texas Instruments\TSW7001. Details of this installer and the GUI functions are covered in Section 5. Once the software is installed, power up the TSW7001 and attach the personal computer (PC) to the TSW7001 via the USB connector. The PC detects a TSW7001 device. If the PC cannot find the drivers automatically, point the Device Wizard to C:\Program Files\Texas Instruments\TSW7001\TSW7001_Drivers for the correct USB drivers. 5 Software 5.1 Software Introduction The TSW7001 GUI software allows you to control the voltage of the DAC8831 precision voltage DAC. The minimum to maximum voltage output ranges from -1 V to +1 V, which is the range of the control voltage for the VCA824. 4 Voltage-Controlled Amplifier Evaluation Kit SLWU058 - August 2008 Submit Documentation Feedback www.ti.com 5.2 Software Software Installation The GUI can be installed via the TSW7001_setup.exe file. Executing this file starts the program and driver installation. Click Next to proceed to the end-user license agreement. Read and accept the end-user license agreement, and click Next. SLWU058 - August 2008 Submit Documentation Feedback Voltage-Controlled Amplifier Evaluation Kit 5 Software www.ti.com Set up the User Name and Organization. Click Next. Do a Complete Install. Click Next, then click Install. 6 Voltage-Controlled Amplifier Evaluation Kit SLWU058 - August 2008 Submit Documentation Feedback Software www.ti.com Wait a couple of minutes for the installer to complete. Then Click Finish. The new executable can be found under the Programs\Texas Instruments\TSW7001 folder from the Start menu or in the C: drive at C:\Program Files\Texas Instruments\TSW7001\TSW7001_DAC8831_USB_GUI.exe Plug in the USB cable to the PC and the TSW7001. This causes the hardware wizard to detect the TSW7001 and start installing the drivers. Click Continue Anyway when asked about Windows Compatibility. SLWU058 - August 2008 Submit Documentation Feedback Voltage-Controlled Amplifier Evaluation Kit 7 Software www.ti.com The hardware is found and is ready to use. 5.3 TSW7001 GUI Software Once the TSW7001 GUI is started, and the EVM has gone through USB enumeration, the CONNECT button must be pressed to establish an open communications channel between the PC and the TSW7001. The GUI responds with a message indicating that communication has been established. At this point, static voltage levels can be programmed to set the VCA824 to a fixed gain from the front panel by entering decimal values in the Write text box and clicking the WRITE button. The control DAC values can range from 0-65535 (16 bit DAC). The 40-dB gain is controlled by this voltage. The front panel also has two special cyclic functions: a step function and a ramp function. The step function has a text box to enter the low-step DAC value and the time length and the high-step DAC value and the time length. Each unit of time is accounted as one time tick which is one USB update cycle. This varies from computer to computer and can be 10-30 ms long. The ramp function is similar and requires entering the start and stop values of the ramp and the rise and fall time length in time-tick increments. Logging of the data writes is optional and can be controlled by checking the Log Output box. The message window can be cleared with the Clear button. 8 Voltage-Controlled Amplifier Evaluation Kit SLWU058 - August 2008 Submit Documentation Feedback Software www.ti.com Figure 5. TSW7001 Control Voltage GUI Figure 6. TSW7001 Output for Step Function SLWU058 - August 2008 Submit Documentation Feedback Voltage-Controlled Amplifier Evaluation Kit 9 Software www.ti.com Figure 7. TSW7001 Ramp Output Figure 8. TSW7001 Arbitrary Gain Profile Panel 10 Voltage-Controlled Amplifier Evaluation Kit SLWU058 - August 2008 Submit Documentation Feedback TSW7001 EVM Introduction www.ti.com Figure 9. Output of TSW7001 With Arbitrary Gain Profile 6 TSW7001 EVM Introduction The TSW7001 was designed to provide an easy way to test the VCA824 in a high-performance, voltage-controlled gain application. The EVM includes a16-bit DAC8831 voltage-controlled DAC to precisely control the voltage-controlled gain of the VCA824. An optional high-impedance input stage, consisting of an OPA656 circuit, can be enabled to implement a transimpedance function for connection to a photodiode application. The output of the VCA is designed to drive out to 50- test equipment. 6.1 Jumper Settings Two solder jumpers can be used to bypass the OPA656 (default) or enable the OPA656 in the signal path. SJP5 and SJP6 must be in the 1-2 position by default to bypass, or in 2-3 position to enable the OPA656. Optional external power supplies can be used for the OPA656 and VCA824. This requires that some ferrite beads be removed to isolate the V+ and V- supplies. 6.2 Input/Output Connectors Table 1 lists the input and output connectors. Table 1. Input and Output Connections REFERENCE LABEL DESIGNATOR 6.3 CONNECTOR TYPE DESCRIPTION J26 IN SMA Input ac signal / Connection for external photodiode J27 OUT SMA Output from VCA824 - 50- source impedance J13 USB USB CONN USB input J12 CONN JACK PWR Power Jack Power input for 6-V wall supply J24 6.0V IN Banana Jack +6-V input banana jack J25 GND Banana Jack GND USB Interface The TSW7001 contains a 4-pin, USB port connector to interface to a USB 1.1 or later compliant USB port. Programming the DAC8831 control voltage is accomplished through this connector. SLWU058 - August 2008 Submit Documentation Feedback Voltage-Controlled Amplifier Evaluation Kit 11 Demonstration Kit Test Configuration 6.4 www.ti.com Power Management The TSW7001 requires an input of 6 Vdc either from the banana jack connectors or the supplied 6-V wall supply. A current rating of at least 2 A is recommended for the 6-V supply. The rest of the supplies: 3.3, 5 V are all generated on the board with linear regulators. 7 Demonstration Kit Test Configuration 7.1 Test Setup Block diagram The test setup for the TSW7001 is shown in Figure 10. This setup shows an input signal from a signal generator applied at the input of the TSW7001. The output from the VCA824 is fed into an oscilloscope, spectrum analyzer, or some other 50- terminated test equipment. Figure 10. TSW7001 Test Setup 7.2 Test Equipment The following test equipment is required for testing the TSW7001. Some other equipment can be used; however, results can vary due to limitations of the instruments. * Power supply 6 Vdc, 2 A. * Spectrum Analyzer: Rhode & Schwarz FSU, FSQ, or equivalent * Oscilloscope: Tektronik, LeCroy or other * Pattern generator: Agilent ESG or other signal source * Digital voltmeter to verify signal levels 7.3 Typical Performance Measurements The gain of the VCA824 is controlled by the voltage output of the DAC8831. The DAC8831 uses a 1.2-V reference to generate a 2-Vpp signal, which is buffered and level-shifted by an OPA727 to produce a 1-V signal to drive the VCA824 gain control pin. The -1 V corresponds to the minimum gain of 0 dB (or maximum loss of -40 dB from nominal gain). The +1 V corresponds to maximum gain of +40 dB (or minimum loss of 0 dB from nominal gain). 12 Voltage-Controlled Amplifier Evaluation Kit SLWU058 - August 2008 Submit Documentation Feedback Demonstration Kit Test Configuration www.ti.com The input of the TSW7001 is by default terminated with a 50- to ground to enable a connection to a 50- signal source. Typical IMD3 and harmonic distortion data was obtained for the default case of 40-dB gain (Rf=402, Rg=18) driving 100 at the output of the TSW7001 (50- source into 50- spectrum analyzer). Figure 11. IMD3 Plot for TSW7001 at 10 MHz -50 -52 -54 Gain - dB -56 -58 -60 -62 -64 -66 -68 -70 1 10 f - Frequency - MHz 100 Figure 12. IMD3 for TSW7001 in 40-dB Gain Mode SLWU058 - August 2008 Submit Documentation Feedback Voltage-Controlled Amplifier Evaluation Kit 13 Initial Power Up and Test www.ti.com -30 -35 HD2 Gain - dB -40 -45 HD3 -50 -55 -60 -65 1 10 f - Frequency - MHz 100 Figure 13. Harmonic Distortion for TSW7001 in 40-dB Gain Mode 8 Initial Power Up and Test Plug in the 6-V power supply. This lights up the power LED D18. Plug in the USB cable, and connect it to the PC. Allow a few seconds for the USB to register and enumerate. Once the computer has detected the TSW7001 EVM, then start the TSW7001 Control Panel GUI - refer to Section 5. Ensure that the TSW7001 Control Panel GUI connects to the TSW7001 EVM. 8.1 Initial Test Do not connect any input signals into J26 at this time. Change the static voltage register value in the GUI to 0, and click WRITE. Monitor the voltage level at C74. This level reads -1 V. Change the static register value to 65535, click WRITE. This generates a +1 V on C74. This is the range of the control voltage used to control the gain of the VCA824. Set the register value back to 0 (-1 V for minimum gain). 8.2 Functional Test Connect a 50- signal source to the input of the TSW7001EVM at J26. Set the signal frequency to 10 MHz, and the amplitude to -20 dBm. Set the static voltage register value to 32767 (midscale) to set the control voltage to about 0 Vdc. Verify at the output SMA J27 that the 10-MHz tone changes to 20 dB. Verify that the cyclic step and ramp functions on the first tab of the GUI by entering values for the step and ramp. Monitor on an oscilloscope that the sine-wave amplitude is changing as expected. Verify that the arbitrary cyclic function on the second tab of the GUI by entering some arbitrary gain steps. 9 Optional Configurations 9.1 Optional OPA656 Input Buffer An OPA656 amplifier is included on the EVM to be used as an input buffer stage. The OPA656 combines a wideband, unity-gain-stable, voltage-feedback operational amplifier with a FET-input stage to offer an ultra-high, dynamic-range amplifier for buffering and transimpedance applications. Extremely low dc errors give good precision in optical applications. 14 Voltage-Controlled Amplifier Evaluation Kit SLWU058 - August 2008 Submit Documentation Feedback Optional Configurations www.ti.com The high unity-gain-stable bandwidth and JFET input allows exceptional performance in high-speed, low-noise integrators. The high-input impedance and low-bias current provided by the FET input is supported by the ultra-low, 7-nV/Hz, input voltage noise to achieve a low integrated noise in wideband photodiode transimpedance applications. Broad transimpedance bandwidths are achievable given the OPA656's high 230-MHz-gain bandwidth product. As shown in Figure 14, a -3-dB bandwidth of 1 MHz is provided even for a high 1-M transimpedance gain from a 47-pF source capacitance. This amplifier is by default bypassed; however, it can be placed back in the signal path by changing the position of SJP5 and SJP6 to 2-3. The input and feedback circuits of the OPA656 have to be modified appropriately for the intended application. Contact factory applications support for help with specific requirements. Figure 14. Optional Path for OPA656 Input Buffer/Transimpedance Amplifier. 9.2 Different Amplifier Voltage Supplies When changing the amplifier power supplies from the onboard 5 V to some external supply, it is important to ensure that the voltages to the OPA656 stay within 4 V to 6 V. Remove the ferrite beads that connect the OPA656 to the Vamp supplies (FB7, FB13). External supplies then can be connected to the +VAMP and -VAMP test points (TP3, TP9). The onboard 5 V is still used by other onboard circuits. SLWU058 - August 2008 Submit Documentation Feedback Voltage-Controlled Amplifier Evaluation Kit 15 Bill of Materials and Schematics 10 www.ti.com Bill of Materials and Schematics This section contains the bill of materials and schematics for the TSW7001EVM. Table 2. Bill of Materials QTY 16 Part Reference Value PCB Footprint Mfr_Name Mfr_Part_No. 1 C37 2.2 F 1206 Murata GRM31MR71C225KA3 5L 2 C38 C39 2.2 F TANT_A ROHM TCA1C225M8R 3 C56 C79 C124 0.01 F 0603 Panasonic ECJ-1VB1C103K 10 C57 C61 C65 C66 C69 C100 C131 C149 C168 C352 0.1 F 0402 Panasonic ECJ-0EB1C104K 1 C58 4.7 F tant_a AVX TAJA475K020R 2 C59 C60 47 pF 0603 Panasonic ECJ-1VC1H470J 1 C62 100 F tant_c AVX TPSC1070M010R0075 1 C63 1 F tant_a AVX T494A105M016AT 1 C64 4.7 F tant_b AVX T494B475M010AT 6 C67 C68 C81 C123 C153 C169 47 F tant_b Kemet T494B476M010AS 0 C71 0.1 F 0402 Panasonic ECJ-0EB1C104K_DNI 1 C72 20 pF 0402 Murata GRM1555C1H200JZ01 D 1 C73 1500 pF 0402 Panasonic ECJ-0EB1E152K 1 C74 3900 pF 0603 Panasonic ECJ-1VB1H392K 3 C78 C91 C125 1 F 0603 Panasonic ECJ-1V41E105M 3 C80 C126 C127 10 F tant_a Kermet T494A106M016AS 3 C90 C92 C99 0.01 F 0402 Panasonic ECJ-0EB1E103K 6 C148 C154 C155 C163 C164 C170 10 uF 1206 Panasonic ECJ-3YB1C106K 1 C171 0.015 F 0402 Panasonic ECJ0EB1C153K 1 C350 0.6 pF 0603 AVX 06035J0R6PBTTR 1 C351 X2Y 0.1 F FILTER_3_SM_X2Y_0603 Yageo CX0603MRX7R6BB104 1 D18 LED green LED_0805 Panasonic LNJ306G5UUX 1 D20 20V, 1A MCC_SOD123 On Semi MBR120LSFT1 6 FB4 FB7 FB13 FB16 FB23 FB26 68 at 100 MHz 1206 Panasonic EXC-ML32A680U 1 J12 CONN JACK PWR CON_RAPC722_JACK_THVT_3 Switchcraft RAPC722 1 J13 USB_B_S_F_B_TH CON_THRT_USB_B_F SAMTEC USB-B-S-F-B-TH 1 J24 BANANA_JACK_RED CON_THVT_BANANA_JACK_250DIA SPC Technology 845-R 1 J25 BANANA_JACK_BLK CON_THVT_BANANA_JACK_250DIA SPC Technology 845-B 2 J26 J27 SMA_END_JACK_RND SMA_SMEL_373x312 Johnson Components 142-0701-801 1 L9 100 H IND_SM_MSS1048 COILCRAFT MSS1048-104MLB 5 R72 R108 R109 R113 R114 10K 0402 Panasonic ERJ-2RKF1002X 1 R73 2.87K, 62 mW 0402 Panasonic ERJ-2RKF2872X 2 R74 R83 100K 0603 Panasonic ERJ-3EKF1003V 6 R78 R79 R81 R84 R89 R97 22.1 0402 Panasonic ERJ-2RKF22R1X 3 R80 R82 R90 100 0402 Panasonic ERJ-2RKF1000X 1 R85 250K 1206 Ohmite HVF1206T2503FE 1 R117 300 0603 Panasonic ERJ-3EKF3000V 4 R118-R121 0 0603 Panasonic ERJ-3GEY0R00V 1 R122 2K 0603 Vishay CRCW06032K00FKEA 1 R290 50K 1206 Ohmite HVF1206T5002FE 1 R291 18 0402 Panasonic ERJ-2RKF18R0X 3 R295 R296 R299 50 0402 Vishay FC0402E50R0BST1 2 R298 R300 20 0402 Panasonic ERJ-2RKF20R0X 1 R301 50 0603 Vishay FC0603E50R0BTBST1 1 R302 402 0402 Panasonic ERJ-2RKF4020X 2 SJP5 SJP6 Jumper_1x3_SMT SMD_BRIDGE_1x3_0603 DNI DNI 12 TP2-TP7, TP9, TP11-TP15 Testloop_Black TP_THVT_060_RND Components Corporation TP-105-01-00 Voltage-Controlled Amplifier Evaluation Kit Note DNI LOW ESR (SHUNT 1-2) SLWU058 - August 2008 Submit Documentation Feedback Bill of Materials and Schematics www.ti.com Table 2. Bill of Materials (continued) QTY Part Reference Value PCB Footprint Mfr_Name Mfr_Part_No. 1 U5 FT245RL SSOP_28_413x220_26 FTDI Chip FT245RL 1 U7 TPS5430 PSOP_8P_THERMAL Texas Instruments TPS5430DDA 1 U8 UCC284-5 SOIC_8 Texas Instruments UCC285-5 1 U10 SN74AHC541PW TSSOP_20_260x177_26 Texas Instruments SN74AHC541PW 1 U13 TPS76750QPWP HTSSOP_20_260x177_26_pwrpad Texas Instruments TPS76750QPWP 1 U15 TPS76733QPWP HTSSOP_20_260x177_26_pwrpad Texas Instruments TPS76733QPWP 1 U16 DAC8831ID SO_14_344x157_50 Texas Instruments DAC8831ID 1 U17 OPA727AIDGK HTSSOP_8_120x120_26 Texas Instruments OPA727AIDGK 1 U18 VCA824ID SO_14_344x157_50 Texas Instruments VCA824ID 1 U19 OPA656 SO_8_197x157_50 Texas Instruments OPA656U 1 VR1 LM285-1.2 TO_226 Texas Instruments LM285-1.2 Screw panhead 4-40 x 3/8 Building Fasteners PMS 440 0038 PH Screw for standoff Shunt-jumper-0603 Panasonic ERJ-3GE0R00X Shunt for jumper Standoff alum hex 4-40 x 0.500 Keystone 2203 Standoff 4 2 4 FOR SJP5 & SPJ6 SLWU058 - August 2008 Submit Documentation Feedback Note Voltage-Controlled Amplifier Evaluation Kit 17 J26 IN SMA END 4 3 2 5 1 0 R119 3 1 TP15 (SHUNT 1-2) 2 SJP5 0 R121 4 C73 1500pF U19 -VS 6 C65 .1uF +5VA VR1 LM285-1.2 + R120 0 R85 250K +5VA OPA656 OUT +VS -V_AMP 3 IN+ 2 IN20pF C72 7 +V_AMP 50K R290 0.6pF C350 2 Voltage-Controlled Amplifier Evaluation Kit 3 1.2V 2 C69 .1uF SH2 SDIO SH2 SCLK 10 8 7 11 14 6 5 (SHUNT 1-2) 3 1 SH2 SDENB C127 10uF 10V 50 R295 SJP6 AGND AGND DGND NC VOUT INV RFB DAC8831ID SDI SCLK CS LDAC VDD VREF-F VREF-S U16 R296 50 4 3 12 9 2 13 1 3 +IN -5V 3 +Vcc NC FB GND VOUT VREF -Vcc U18 2K R122 -V_AMP VCA824ID +Vcc VG +VIN +RG -RG -VIN -Vcc 6 OUT VOPA727AIDGK 4 V+ U17 +5VA 7 1 2 3 4 5 6 7 R299 50 +V_AMP 2 VG -IN R291 18 2 1 C38 2.2uF + 20% 16V 1 2 C351 X2Y .1uF 14 13 12 11 10 9 8 C74 3900pF R298 20 VG C352 .1uF 402 20 R109 10K C39 2.2uF 20% 16V R302 R300 +V_AMP -V_AMP 2 1 18 50 R301 C71 .1uF DNI 1 SMA END 4 3 2 5 + +V_AMP J27 OUT Bill of Materials and Schematics www.ti.com 10.1 Schematics The TSW7001EVM schematics follow. SLWU058 - August 2008 Submit Documentation Feedback SLWU058 - August 2008 Submit Documentation Feedback GND1 VCC -DATA +DATA GND2 GND 1 2 3 4 USB_B_S_F_B_TH 6 5 J13 USB_CONN C59 47pF FB4 C60 47pF 68 OHM @ 100MHz C56 .01uF C57 .1uF C61 .1uF + C58 4.7uF 20V 25 7 18 21 26 17 28 27 24 19 8 4 15 16 20 FT245RL AGND GND GND GND TEST WR RD TXE RXF D7 D6 D5 D4 D3 D2 D1 D0 PWREN U5 3V3OUT OSCO OSCI NC2 RESET NC1 VCCIO USBDP USBDM VCC 22.1 22.1 22.1 R79 R97 10 12 14 13 22 23 6 2 R89 22.1 9 11 R84 22.1 R81 5 3 22.1 R78 1 R113 10K R114 10K R108 10K +3.3V_LOGIC U10 OE1 VCC A1 OE2 A2 Y1 A3 Y2 A4 Y3 A5 Y4 A6 Y5 A7 Y6 A8 Y7 GND Y8 20 19 18 17 16 15 14 13 12 11 SN74AHC541PW 1 2 3 4 5 6 7 8 9 10 R90 R80 R82 C131 .1uF +3.3V_LOGIC 100 100 100 SDIO SDENB SCLK SH1 SH1 SH1 www.ti.com Bill of Materials and Schematics Voltage-Controlled Amplifier Evaluation Kit 19 -5V + C126 10uF 10V C80 10uF 10V +5VA 68 OHM @ 100MHz FB13 68 OHM @ 100MHz FB7 C92 .01uF C37 2.2uF C125 1uF 20% 25V C78 1uF 20% 25V 2 3 5 +V_AMP C124 .01uF TP3 +V_AMP Z_SCREW1 D20 20V, 1A MBR120LSFT1 100uH L9 C62 100uF + 20% 10V LOW ESR + VSENSE 1 2 3 4 5 6 7 8 9 10 Z_STANDOFF2 STANDOFF ALUM HEX 4-40 x .500 STANDOFF ALUM HEX 4-40 x .500 SCREW PANHEAD 4-40 x 3/8 Z_SCREW2 STANDOFF ALUM HEX 4-40 x .500 Z_STANDOFF3 SCREW PANHEAD 4-40 x 3/8 Z_SCREW3 GND Vout VoutS SD/CT U8 R74 UCC284-5 Vin Vin2 Vin3 Vin4 Z_SCREW4 20 19 18 17 16 15 14 13 12 11 21 2 3 6 7 STANDOFF ALUM HEX 4-40 x .500 Z_STANDOFF4 SCREW PANHEAD 4-40 x 3/8 TPS76750QPWP GND/HTSNK1 GND/HTSNK2 GND GND/HTSNK8 NC1 GND/HTSNK7 EN NC4 IN1 NC3 IN2 RESET NC2 FB/NC GND/HTSNK3 OUT2 GND/HTSNK4 OUT1 GND/HTSNK6 GND/HTSNK5 PWRPAD -5.5V TP11 C63 + 1uF 20% 16V U13 -5.5V R73 2.87K, 62mW R72 10K MECHANICAL HARDWARE C148 10uF 10% 16V +6.0VDC C100 .1uF 10% 16V Z_STANDOFF1 SCREW PANHEAD 4-40 x 3/8 C99 .01uF VSENSE TP9 -V_AMP C123 47uF 20% 10V -V_AMP 6 4 1 8 C81 47uF 20% 10V TPS5430 GND Vsense BOOT C79 + .01uF NC NC2 ENA PH 1 2 U7 1 2 Vin PWP 9 1 2 7 2 C155 10uF 10% 16V C171 1 -5V .015uF 10% 16V LOW ESR + -5V TP12 100K 5 1 8 4 C64 1 FB23 4.7uF 20% 10V TP2 GND 68 OHM @ 100MHz 2 TP4 GND + TP5 GND C153 47uF 10V 20% TP13 +5VA TP7 GND C154 10uF 10% 16V TP6 GND + +5VA 1 2 Voltage-Controlled Amplifier Evaluation Kit + 20 + + +6.0VDC C149 .1uF 10% 16V Bill of Materials and Schematics www.ti.com SLWU058 - August 2008 Submit Documentation Feedback References www.ti.com U15 C163 10uF 10% 16V LOW ESR + TP14 3.3V 20 19 18 17 16 15 14 13 12 11 21 R83 R118 100K 0 +3.3V_LOGIC FB26 68 OHM @ 100MHz + LOW ESR C164 10uF + 10% 16V TPS76733QPWP C169 47uF 20% 10V + C170 10uF 10% 16V 1 GND/HTSNK1 GND/HTSNK2 GND GND/HTSNK8 NC1 GND/HTSNK7 EN NC4 IN1 NC3 IN2 RESET NC2 FB/NC GND/HTSNK3 OUT2 GND/HTSNK4 OUT1 GND/HTSNK6 GND/HTSNK5 PWRPAD 2 +6.0VDC 1 2 3 4 5 6 7 8 9 10 C168 .1uF 10% 16V +6.0VDC J12 FB16 1 2 3 68 OHM @ 100MHz R117 300 J24 +6.0V_IN BANANA_JACK_RED C67 47uF 20% 10V 2 + 1 CONN JACK PWR C66 .1uF 10% 16V D18 LED green +6V C91 1uF 20% 25V C90 + .01uF C68 47uF 20% 10V J25 GND BANANA_JACK_BLK 11 References 1. Control Frequency Response and Noise in Broadband , Photodetector, Transimpedance Amplifiers, Michael Steffes, Electronic Design News, July 4, 1996. 2. VCA824, Ultra-Wideband, >40dB Gain Adjust Range, Linear in V/V Variable Gain Amplifier data sheet (SBOS394) 3. OPA656, Wideband, Unity-Gain Stable, FET-Input Operational Amplifier data sheet (SBOS196) SLWU058 - August 2008 Submit Documentation Feedback Voltage-Controlled Amplifier Evaluation Kit 21 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 PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. 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