Texas Instruments TSW3000 User Manual
TSW3000 Demo Kit
User's Guide
September 2005
SLWU013A
TSW3000 Demo Kit
User's Guide
Literature Number: SLWU013A
March 2004 – Revised September 2005
Contents
1 Demo Kit Configuration Options ................................................................................... 7
1.1 DAC Component .................................................................................................... 7
1.2 VComm Configuration .............................................................................................. 7
1.3 VCXO ................................................................................................................. 7
1.4 VCO .................................................................................................................. 7
2 Block Diagrams .......................................................................................................... 8
2.1 System Block Diagram ............................................................................................. 8
2.2 Demo Kit Block Diagram ........................................................................................... 8
3 Key Texas Instruments Components ............................................................................. 9
3.1 CDCM7005 .......................................................................................................... 9
3.2 DAC5687 ............................................................................................................. 9
3.3 TRF370x ............................................................................................................. 9
3.4 TRF3750 ............................................................................................................. 9
4 Software Installation .................................................................................................... 9
5 Software Operation ..................................................................................................... 9
5.1 CDCM7005 Software ............................................................................................. 10
5.2 TRF3750 Software ................................................................................................ 12
5.3 DAC5687 Software ................................................................................................ 13
5.4 DAC5687 GUI Register Descriptions ........................................................................... 14
6 Board Setup .............................................................................................................. 16
6.1 Jumper Settings ................................................................................................... 16
6.2 Input/Output Connectors ......................................................................................... 17
6.3 Parallel Port ........................................................................................................ 17
6.4 DC Power Requirements ......................................................................................... 17
7 Demo Kit Test Configuration ....................................................................................... 17
7.1 Test Setup Block Diagram ....................................................................................... 18
7.2 Test Equipment .................................................................................................... 18
7.3 Calibration .......................................................................................................... 18
7.4 Test Specifications ................................................................................................ 18
8 Basic Test Procedure ................................................................................................. 19
8.1 Initial Inspection ................................................................................................... 19
8.2 Engage Power Supplies .......................................................................................... 19
8.3 Program the CDCM7005 ......................................................................................... 19
8.4 Program the TRF3750 ............................................................................................ 19
8.5 DAC5687 Program ................................................................................................ 20
8.6 Carrier Suppression ............................................................................................... 21
8.7 Sideband Rejection ............................................................................................... 22
9 Optional Configurations ............................................................................................. 24
9.1 External LO ........................................................................................................ 24
9.2 External Reference ................................................................................................ 24
9.3 Monitor DAC Output .............................................................................................. 24
SLWU013A – March 2004 – Revised September 2005 Table of Contents 3
10 Filter Specifications ................................................................................................... 25
10.1 Baseband Filter .................................................................................................... 25
11 Layers and Schematics .............................................................................................. 25
11.1 Layers ............................................................................................................... 26
11.2 Schematics ......................................................................................................... 35
Contents 4 SLWU013A – March 2004 – Revised September 2005
List of Figures
1 System Block Diagram ...................................................................................................... 8
2 Demo Kit Block Diagram .................................................................................................... 8
3 TSW3000 Startup Screen ................................................................................................. 10
4 Default CDCM7005 SPI GUI .............................................................................................. 11
5 TRF3750 GUI - Main Menu ............................................................................................... 12
6 TRF3750 GUI - Advanced Menu ......................................................................................... 13
7 DAC5687 GUI .............................................................................................................. 14
8 Test System Block Diagram .............................................................................................. 18
9 Default DAC GUI With f
10 Single Sideband Spectrum Output Before DAC Offset and QMC Adjustments ................................... 22
11 DAC GUI With Typical Settings To Minimize LO and Sideband ..................................................... 23
12 Sideband and LO ........................................................................................................... 24
13 Top Layer .................................................................................................................... 26
14 Top Layer (NH) ............................................................................................................. 27
15 Layer 2 ....................................................................................................................... 28
16 Layer 3 ....................................................................................................................... 29
17 Layer 4 ....................................................................................................................... 30
18 Layer 4 (NH) ................................................................................................................ 31
19 Layer 5 ....................................................................................................................... 32
20 Bottom Layer ................................................................................................................ 33
21 Bottom Silkscreen .......................................................................................................... 34
22 Drill Drawing ................................................................................................................ 35
/8 Tone From NCO ........................................................................ 21
DAC
SLWU013A – March 2004 – Revised September 2005 List of Figures 5
List of Tables
1 Frequency Bands ............................................................................................................ 7
2 CDCM7005 Register Values .............................................................................................. 11
3 Jumper List .................................................................................................................. 16
4 Input/Output Connections ................................................................................................. 17
5 Demo Kit Specifications ................................................................................................... 18
6 Frequency Designations ................................................................................................... 19
List of Tables6 SLWU013A – March 2004 – Revised September 2005
1 Demo Kit Configuration Options
The TSW3000 Demo Kit can be configured in different ways to evaluate different components in different
frequency bands. This section outlines the various component configurations. Based on the configuration,
testing and board setup must be altered to accommodate the given components and features.
1.1 DAC Component
The TSW3000 Demo Kit is built for the DAC5687, although this Demo Kit can also support the DAC5686
since the two devices are pin compatible. The procedures outlined in this document are primarily suited for
the DAC5687, but can be modified easily for the DAC5686 if desired.
1.2 VComm Configuration
The analog quadrature modulator requires a common-mode dc voltage of approximately 3.7 V. In order to
utilize the dc-offset adjustment capabilities of the DAC568x for carrier suppression, it is imperative to
maintain a dc path from the DAC output to the modulator input. The common-mode voltage for the
modulator is maitained with a passive resistor network that is designed to provide the proper operation
point for the DAC568x and the TRF370x modulator. By design, in order to preserve the proper dc levels,
the DAC gain should be kept at maximum (15), though deviation by a few steps is generally acceptable
with no degradation in performance.
User's Guide
SLWU013A – March 2004 – Revised September 2005
1.3 VCXO
The CDCM7005 requires a VCXO source to derive its output clock signals. The VCXO is at reference
designator U10 on the back side of the board. The frequency of the VCXO can be changed to operate the
Demo Kit with different clocking schemes for different modulation standards or for specific customer
requirements. Denote which VCXO frequency is on the board so that the CDCM7005 part can be set up
properly. The following conventions are typically used:
• WCDMA: Derivatives of 61.44 MHz (i.e., 122.88 MHz, 245.76 MHz, 491.52 MHz)
• GSM: Derivatives of 52 MHz (i.e., 104 MHz, 208 MHz)
• CDMA2K: Derivativies of 78.6432 (i.e., 157.2864 MHz, 314.5728 MHz)
1.4 VCO
The VCO outputs the RF signal used for the LO drive on the analog quadrature modulator. The RF output
frequency is contingent on the LO frequency value.
The RF frequency band of the VCO must be noted in order to know how to program the TRF3750 and
where to measure the output RF signal from the modulator. The typical bands of operation are shown in
Table 1 .
Table 1. Frequency Bands
UMTS PCS GSM900 DCS1800
FREQUENCY 2110-2170 MHz 1930-1990 MHz 935-960 MHz 1805-1880 MHz
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DAC
I/Q
Modulator
90°
0°
LPA
TX
Diplexer
ANT
RX
LNA
A/D
I/Q
Demod
16
DAC5687
16
CLK1
I
Q
TRF370x
I/Q
Modulator
RF
LO
VCO
TRF3750
VCXO
PLL
Ref Osc
CDCM7005
CLK2
Block Diagrams
2 Block Diagrams
2.1 System Block Diagram
The basic radio system block diagram in Figure 1 demonstrates where the TSW3000 Demo Kit fits in the
overall transceiver. The dash-line box illustrates the components found on the TSW3000 Demo Kit board.
2.2 Demo Kit Block Diagram
Figure 1. System Block Diagram
The basic Demo Kit block diagram is shown in Figure 2 . The shaded boxes illustrate the key Texas
Instruments components found on the TSW3000 Demo Kit board.
Figure 2. Demo Kit Block Diagram
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3 Key Texas Instruments Components
3.1 CDCM7005
The CDCM7005 clock distribution chip is used to generate and synchronize the clock outputs to the
system. The device has five outputs which can be either LVPECL or LVCMOS and can be divided down
by 1, 2, 3, 4, 6, 8, and 16. The divide by 16 can be replaced with a divide by 4 or 8 with a 90 degree
phase shift.
3.2 DAC5687
The DAC5687 is a 16-bit interpolating dual digital-to-analog converter (DAC). The device incorporates a
digital modulator, independent differential offset control, and I/Q amplitude control. The device is typically
used in baseband mode or in low IF mode in conjunction with an analog quadrature modulator.
3.3 TRF370x
The TRF370x is a direct upconvert I/Q modulator. The device accepts differential input voltage at
baseband or low IF frequencies and outputs an RF signal based on the LO drive frequency.
3.4 TRF3750
The TRF3750 is a PLL chip used in the synthesizer section to generate the LO frequency required for the
I/Q modulator.
Key Texas Instruments Components
4 Software Installation
5 Software Operation
This section summarizes the installation procedures for the software required to operate the Demo Kit.
Once all of the software is loaded, it is recommended to reboot the computer.
• Extract TSW3000-Installv2p0.zip
• Execute setup.exe
The following describes the use of the software required to set the TSW3000 Demo Kit in the baseline
configuration for the CDCM7005, TRF3750, and DAC5687. The software should be configured in the
order presented below. The first step requires starting the TSW3000 software. This opens a window as
shown in Figure 3 . The tabs on the left side of the window allow selection of different GUI controllers for
the DAC5687, TRF3750, and CDCM7005. The lower left portion of the screen contains links to this user's
guide as well as the data sheets for the DAC5687, TRF3750, and the CDCM7005.
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Software Operation
5.1 CDCM7005 Software
By using the provided CDCM7005 serial peripheral interface (SPI) software, the user can load settings to
the CDCM7005 internal registers. This must be performed every time the TSW3000 Demo Kit is powered
up, since the CDCM7005 has default settings that are loaded at power up and the settings may be slightly
different than the ones required to operate the Demo Kit. Executing the program brings up the interface
seen in Figure 4 . The default settings are correct for a VCXO of 491.52 MHz and a 10 MHz reference as
on the TSW3000. The CDCM7005 GUI allows register settings to be saved and can be loaded back in
afterwards. This can be accomplished with the Save and Load Settings buttons near the right side of the
GUI.
It is recommended that any unused output clocks be tri-stated. In this case the TSW3000 only uses
OUT_MUX_1 to drive the DAC5687. OUT_MUX_0, OUT_MUX_2, OUT_MUX_3, OUT_MUX_4 should be
tri-stated unless there is a need to use the other output clocks.
Figure 3. TSW3000 Startup Screen
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Software Operation
Figure 4. Default CDCM7005 SPI GUI
The divider parameters, M and N, are determined according to the following equation based on the
internal reference frequency and internal VCXO frequency.
F
= (F
REF
VCXO
× M)/(N × P)
The p parameter is the VCXO input divider and set through the FB_MUX value. The M and N counter
values need to be adjusted depending on the board configuration. The M and N counter registers are
determined by the reference frequency and the VCXO frequency. The OUT_MUX sets the divide ratios for
the individual output clocks. The OUTSEL determines whether the output clocks will be used as
single-ended CMOS or differential LVPECL. With a 10-MHz reference oscillator the CDCM7005 settings
are shown in Table 2 for a variety of common VCXO frequencies. For other frequencies, see to the
CDCM7005 data sheet for more details.
Table 2. CDCM7005 Register Values
VCXO Freq. (MHz) 491.52 245.76 122.88 61.44
Divider M 125 125 125 125
Divider N 768 768 768 768
FB_MUX 8 4 2 1
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Software Operation
5.2 TRF3750 Software
The TRF3750 software is used to program the PLL chip to lock the VCO oto a desired frequency output.
The main menu of the program is shown in Figure 5 .
Figure 5. TRF3750 GUI - Main Menu
The options in the front panel allow the user to program the desired frequency of the VCO, the desired
frequency of the PFD, the reference frequency, and the prescaler selection. The software then displays
the actual VCO frequency, PFD frequency and the R, N, A, and B counter values to be programmed into
the TRF3750. Hitting the Send button writes these values to the TRF3750. In default mode on a default
board, only the desired VCO frequency (2100 MHz to 2200 MHz) needs to be changed. For other VCO
ranges, other parameters may need to be changed.
The Advanced Operation button will bring up another user interface as shown in Figure 6 .
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Software Operation
5.3 DAC5687 Software
Figure 6. TRF3750 GUI - Advanced Menu
This menu allows control of more register settings. For details on these settings, see the TRF3750 data
sheet (SLWS146 ). The register of interest in this menu is the MUXOUT CONTROL which can be used to
determine the function of LED D4. This mode defaults to Digital PLL Lock Detect and causes the LED D4
to light up when the PLL successfully locks. Normally, these menu settings do not need to be changed.
By using the provided software, the user can write and read control register information to the DAC5687.
At first startup of this software, it is imperative to select the Pll Port Config button to bring up the parallel
port configuration settings. From the menu, select the TSW3000 setting. This configures the port to be
compatible with the TSW3000. Once the Demo Kit is powered on with the parallel port configured and
connected properly, then the GUI shown in Figure 7 is displayed with the default settings read from the
device. If there is a problem with the communication, such as the Demo Kit is not powered on or the
parallel port cable is not connected, an error message will be displayed instructing the user to correct the
problem. Once corrected, hit the Read All button to read the default settings of the device.
SLWU013A – March 2004 – Revised September 2005 13
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