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Texas Instruments Voltage-Controlled Amplifier Evaluation Kit User guides
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
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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
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TSW7001EVM Configuration Options
1
2
3
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5
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9
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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.
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Block Diagrams
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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
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Software Installation
3.2
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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.
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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.
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Set up the User Name and Organization. Click Next.
Do a Complete Install. Click Next, then click Install.
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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.
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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.
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Figure 5. TSW7001 Control Voltage GUI
Figure 6. TSW7001 Output for Step Function
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Figure 7. TSW7001 Ramp Output
Figure 8. TSW7001 Arbitrary Gain Profile Panel
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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-Ω 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-Ω 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.
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Demonstration Kit Test Configuration
6.4
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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-Ω 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).
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Demonstration Kit Test Configuration
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The input of the TSW7001 is by default terminated with a 50-Ω to ground to enable a connection to a 50-Ω
signal source.
Typical IMD3 and harmonic distortion data was obtained for the default case of 40-dB gain (Rf=402,
Rg=18) driving 100 Ω at the output of the TSW7001 (50-Ω source into 50-Ω 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
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Initial Power Up and Test
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-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-Ω 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.
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Optional Configurations
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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-MΩ
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.
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Bill of Materials and Schematics
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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 µF
1206
Murata
GRM31MR71C225KA3
5L
2
C38 C39
2.2 µF
TANT_A
ROHM
TCA1C225M8R
3
C56 C79 C124
0.01 µF
0603
Panasonic
ECJ-1VB1C103K
10
C57 C61 C65 C66
C69 C100 C131 C149
C168 C352
0.1 µF
0402
Panasonic
ECJ-0EB1C104K
1
C58
4.7 µF
tant_a
AVX
TAJA475K020R
2
C59 C60
47 pF
0603
Panasonic
ECJ-1VC1H470J
1
C62
100 µF
tant_c
AVX
TPSC1070M010R0075
1
C63
1 µF
tant_a
AVX
T494A105M016AT
1
C64
4.7 µF
tant_b
AVX
T494B475M010AT
6
C67 C68 C81 C123
C153 C169
47 µF
tant_b
Kemet
T494B476M010AS
0
C71
0.1 µF
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 µF
0603
Panasonic
ECJ-1V41E105M
3
C80 C126 C127
10 µF
tant_a
Kermet
T494A106M016AS
3
C90 C92 C99
0.01 µF
0402
Panasonic
ECJ-0EB1E103K
6
C148 C154 C155
C163 C164 C170
10 uF
1206
Panasonic
ECJ-3YB1C106K
1
C171
0.015 µF
0402
Panasonic
ECJ0EB1C153K
1
C350
0.6 pF
0603
AVX
06035J0R6PBTTR
1
C351
X2Y 0.1 µF
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 Ω 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 µH
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)
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Bill of Materials and Schematics
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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
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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
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SLWU058 – August 2008
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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
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Copyright © 2008, Texas Instruments Incorporated
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