Texas Instruments TSW3000 Manuel utilisateur

TSW3000 Demo Kit

User's Guide

September 2005

SLWU013A

TSW3000 Demo Kit

User's Guide

Literature Number: SLWU013AMarch 2004 – Revised September 2005

Contents
1 Demo Kit Configuration Options ................................................................................... 71.1 DAC Component .................................................................................................... 71.2 VComm Configuration .............................................................................................. 71.3 VCXO ................................................................................................................. 71.4 VCO .................................................................................................................. 72 Block Diagrams .......................................................................................................... 82.1 System Block Diagram ............................................................................................. 82.2 Demo Kit Block Diagram ........................................................................................... 83 Key Texas Instruments Components ............................................................................. 93.1 CDCM7005 .......................................................................................................... 93.2 DAC5687 ............................................................................................................. 93.3 TRF370x ............................................................................................................. 93.4 TRF3750 ............................................................................................................. 94 Software Installation .................................................................................................... 95 Software Operation ..................................................................................................... 95.1 CDCM7005 Software ............................................................................................. 105.2 TRF3750 Software ................................................................................................ 125.3 DAC5687 Software ................................................................................................ 135.4 DAC5687 GUI Register Descriptions ........................................................................... 146 Board Setup .............................................................................................................. 166.1 Jumper Settings ................................................................................................... 166.2 Input/Output Connectors ......................................................................................... 176.3 Parallel Port ........................................................................................................ 176.4 DC Power Requirements ......................................................................................... 177 Demo Kit Test Configuration ....................................................................................... 177.1 Test Setup Block Diagram ....................................................................................... 187.2 Test Equipment .................................................................................................... 187.3 Calibration .......................................................................................................... 187.4 Test Specifications ................................................................................................ 188 Basic Test Procedure ................................................................................................. 198.1 Initial Inspection ................................................................................................... 198.2 Engage Power Supplies .......................................................................................... 198.3 Program the CDCM7005 ......................................................................................... 198.4 Program the TRF3750 ............................................................................................ 198.5 DAC5687 Program ................................................................................................ 208.6 Carrier Suppression ............................................................................................... 218.7 Sideband Rejection ............................................................................................... 229 Optional Configurations ............................................................................................. 249.1 External LO ........................................................................................................ 249.2 External Reference ................................................................................................ 249.3 Monitor DAC Output .............................................................................................. 24
SLWU013A – March 2004 – Revised September 2005 Table of Contents 3

10 Filter Specifications ................................................................................................... 2510.1 Baseband Filter .................................................................................................... 2511 Layers and Schematics .............................................................................................. 2511.1 Layers ............................................................................................................... 2611.2 Schematics ......................................................................................................... 35

Contents 4 SLWU013A – March 2004 – Revised September 2005

List of Figures

1 System Block Diagram ...................................................................................................... 82 Demo Kit Block Diagram .................................................................................................... 83 TSW3000 Startup Screen ................................................................................................. 104 Default CDCM7005 SPI GUI .............................................................................................. 115 TRF3750 GUI - Main Menu ............................................................................................... 126 TRF3750 GUI - Advanced Menu ......................................................................................... 137 DAC5687 GUI .............................................................................................................. 148 Test System Block Diagram .............................................................................................. 189 Default DAC GUI With f

DAC

/8 Tone From NCO ........................................................................ 2110 Single Sideband Spectrum Output Before DAC Offset and QMC Adjustments ................................... 2211 DAC GUI With Typical Settings To Minimize LO and Sideband ..................................................... 2312 Sideband and LO ........................................................................................................... 2413 Top Layer .................................................................................................................... 2614 Top Layer (NH) ............................................................................................................. 2715 Layer 2 ....................................................................................................................... 2816 Layer 3 ....................................................................................................................... 2917 Layer 4 ....................................................................................................................... 3018 Layer 4 (NH) ................................................................................................................ 3119 Layer 5 ....................................................................................................................... 3220 Bottom Layer ................................................................................................................ 3321 Bottom Silkscreen .......................................................................................................... 3422 Drill Drawing ................................................................................................................ 35

SLWU013A – March 2004 – Revised September 2005 List of Figures 5

List of Tables

1 Frequency Bands ............................................................................................................ 72 CDCM7005 Register Values .............................................................................................. 113 Jumper List .................................................................................................................. 164 Input/Output Connections ................................................................................................. 175 Demo Kit Specifications ................................................................................................... 186 Frequency Designations ................................................................................................... 19

List of Tables6 SLWU013A – March 2004 – Revised September 2005

1 Demo Kit Configuration Options

1.1 DAC Component

1.2 VComm Configuration

1.3 VCXO

1.4 VCO

User's GuideSLWU013A – March 2004 – Revised September 2005

The TSW3000 Demo Kit can be configured in different ways to evaluate different components in differentfrequency 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.

The TSW3000 Demo Kit is built for the DAC5687, although this Demo Kit can also support the DAC5686since the two devices are pin compatible. The procedures outlined in this document are primarily suited forthe DAC5687, but can be modified easily for the DAC5686 if desired.

The analog quadrature modulator requires a common-mode dc voltage of approximately 3.7 V. In order toutilize the dc-offset adjustment capabilities of the DAC568x for carrier suppression, it is imperative tomaintain a dc path from the DAC output to the modulator input. The common-mode voltage for themodulator is maitained with a passive resistor network that is designed to provide the proper operationpoint 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 acceptablewith no degradation in performance.

The CDCM7005 requires a VCXO source to derive its output clock signals. The VCXO is at referencedesignator U10 on the back side of the board. The frequency of the VCXO can be changed to operate theDemo Kit with different clocking schemes for different modulation standards or for specific customerrequirements. Denote which VCXO frequency is on the board so that the CDCM7005 part can be set upproperly. 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)

The VCO outputs the RF signal used for the LO drive on the analog quadrature modulator. The RF outputfrequency 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 andwhere to measure the output RF signal from the modulator. The typical bands of operation are shown inTable 1 .

Table 1. Frequency Bands

UMTS PCS GSM900 DCS1800

FREQUENCY 2110-2170 MHz 1930-1990 MHz 935-960 MHz 1805-1880 MHz

SLWU013A – March 2004 – Revised September 2005 7

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2 Block Diagrams

2.1 System Block Diagram

DAC

I/Q

Modulator

90°

0°

LPA TX

Diplexer

ANT

LNA

A/D I/Q

Demod

2.2 Demo Kit Block Diagram

DAC5687

CLK1

TRF370x

I/Q

Modulator RF

VCO

TRF3750

VCXO

PLL

Ref Osc

CDCM7005

CLK2

Block Diagrams

The basic radio system block diagram in Figure 1 demonstrates where the TSW3000 Demo Kit fits in theoverall transceiver. The dash-line box illustrates the components found on the TSW3000 Demo Kit board.

Figure 1. System Block Diagram

The basic Demo Kit block diagram is shown in Figure 2 . The shaded boxes illustrate the key TexasInstruments components found on the TSW3000 Demo Kit board.

Figure 2. Demo Kit Block Diagram

8 SLWU013A – March 2004 – Revised September 2005

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3 Key Texas Instruments Components

3.1 CDCM7005

3.2 DAC5687

3.3 TRF370x

3.4 TRF3750

4 Software Installation

5 Software Operation

Key Texas Instruments Components

The CDCM7005 clock distribution chip is used to generate and synchronize the clock outputs to thesystem. The device has five outputs which can be either LVPECL or LVCMOS and can be divided downby 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 degreephase shift.

The DAC5687 is a 16-bit interpolating dual digital-to-analog converter (DAC). The device incorporates adigital modulator, independent differential offset control, and I/Q amplitude control. The device is typicallyused in baseband mode or in low IF mode in conjunction with an analog quadrature modulator.

The TRF370x is a direct upconvert I/Q modulator. The device accepts differential input voltage atbaseband or low IF frequencies and outputs an RF signal based on the LO drive frequency.

The TRF3750 is a PLL chip used in the synthesizer section to generate the LO frequency required for theI/Q modulator.

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 baselineconfiguration for the CDCM7005, TRF3750, and DAC5687. The software should be configured in theorder presented below. The first step requires starting the TSW3000 software. This opens a window asshown in Figure 3 . The tabs on the left side of the window allow selection of different GUI controllers forthe DAC5687, TRF3750, and CDCM7005. The lower left portion of the screen contains links to this user'sguide as well as the data sheets for the DAC5687, TRF3750, and the CDCM7005.

SLWU013A – March 2004 – Revised September 2005 9

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5.1 CDCM7005 Software

Software Operation

Figure 3. TSW3000 Startup Screen

By using the provided CDCM7005 serial peripheral interface (SPI) software, the user can load settings tothe CDCM7005 internal registers. This must be performed every time the TSW3000 Demo Kit is poweredup, since the CDCM7005 has default settings that are loaded at power up and the settings may be slightlydifferent than the ones required to operate the Demo Kit. Executing the program brings up the interfaceseen in Figure 4 . The default settings are correct for a VCXO of 491.52 MHz and a 10 MHz reference ason the TSW3000. The CDCM7005 GUI allows register settings to be saved and can be loaded back inafterwards. This can be accomplished with the Save and Load Settings buttons near the right side of theGUI.

It is recommended that any unused output clocks be tri-stated. In this case the TSW3000 only usesOUT_MUX_1 to drive the DAC5687. OUT_MUX_0, OUT_MUX_2, OUT_MUX_3, OUT_MUX_4 should betri-stated unless there is a need to use the other output clocks.

10 SLWU013A – March 2004 – Revised September 2005

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