Texas Instruments TRF3750 Series User manual

 
 
2004 Wireless Infrastructure Products
User’s Guide
SLWU009

IMPORTANT NOTICE
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TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
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Mailing Address: Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated

EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE
WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,
IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated

-iv
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the specified input and output voltage ranges described
in the EVM user’s guide.
Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI field
representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification, please
contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
25°C. The EVM is designed to operate properly with certain components above 65°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware that
these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated

Trademarks
v
Preface
Read This First
About This Manual
This user’s guide provides an overview of the TRF3750 evaluation module
(EVM) and the software environment to get you started using the TRF3750
EVM right away. It also provides a general description of the features and func-
tions to be considered while using this module.
How to Use This Manual
This document contains the following chapters:
-Chapter 1—Introduction
-Chapter 2—Software Installation
-Chapter 3—Hardware Configuration
-Chapter 4—Physical Description
-Chapter 5—Schematic
FCC Warning
This equipment is intended for use in a laboratory test environment only. It gen-
erates, uses, and can radiate radio frequency energy and has not been tested
for compliance with the limits of computing devices pursuant to subpart J of
part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other en-
vironments may cause interference with radio communications, in which case
the user at his own expense will be required to take whatever measures may
be required to correct this interference.
Trademarks
Windows is a trademark of Microsoft.
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.

Contents
vi
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.

Contents
vii
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 EVM Basic Functions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Software Installation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Software Installation 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Selecting Menus and Settings 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 TRF3750 Reference Latch Menu 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 TRF3750 N-Counter Latch 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 TRF3750 Function Latch 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 TRF3750 Initialization Latch 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 TRF3750 Set BIts Individually 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8 Parallel Port 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9 Help Menu 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10 Exit 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Hardware Configuration 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 EVM Configuration 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.1 REFIN 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Physical Description 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 PCB Layout 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Parts List 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Schematics 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
viii
Figures
2−1 Structure of the Main Menu 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−2 Example of N-Counter Latch 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−1 Top Layer 1 (TSSOP EVM) 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−2 Ground Plane Layer 2 (TSSOP EVM) 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−3 Power Plane Layer 3 (TSSOP EVM) 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−4 Bottom Layer 4 (TSSOP EVM) 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−5 Top Layer 1 (QFN EVM) 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−6 Ground Plane Layer 2 (QFN EVM) 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−7 Power Plane Layer 3 (QFN EVM) 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−8 Bottom Layer 4 (QFN EVM) 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
3−1 Reference Oscillator Configuration 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−1 TRF3750 EVM Parts List 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Introduction
Introduction
The TRF3750 EVM provides a platform for evaluating the TRF3750 integer-N
PLL frequency synthesizer under various signals, reference, and supply
conditions. This document should be used in combination with the EVM
schematic diagram supplied. Using the TRF3750 EVM, you can rapidly
evaluate the TRF3750 PLL with a minimum of manual setup. The CD-ROM
provides all the software you need to test the device.
Topic Page
1.1 EVM Basic Funcations 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

EVM Basic Functions
1-2
1.1 EVM Basic Functions
The reference input can be provided using the on-board oscillator (Y1) or
brought in externally using the SMA connector J4. The VCO output can be
monitored through the SMA connector J3.
Power connections to the EVM are via a five terminal screw style connector
J1. EMI filters provide isolated power for the analog, digital, and charge pump
power inputs to the TRF3750 and the high-frequency VCO power input. A
mating connector is provided to allow for easy connections to external power
supplies.
The TRF3750 EVM allows the user to program the TRF3750 internal registers
via the supplied computer parallel port cable and serial interface software. The
interface allows read and write access to all registers that define the operation
modes of the TRF3750.
1.2 Power Requirements
The EVM has four terminals for dc power supply and one for ground. Connect
a 5-V dc supply to terminal 1 (VVCO) for the VCO power. Connect 3.3 Vdc or
5 Vdc to terminal 2 (AVDD) for the TRF3750 analog power. DVDD must be set
equal to AVDD, connect either 3.3 Vdc or 5 Vdc to terminal 4 (DVDD) for the
TRF3750 digital power. Connect 7 Vdc to terminal 5 (Vp) for the TRF3750
charge pump supply. Connect ground to terminal 3 (GND).
Note: The operating range for the charge pump supply (VCP) is 8 Vdc max.
Voltrage Limits
Exceeding the maximum input voltages can damage EVM
components. Undervoltage may cuse improper operation of some
or all of the EVM components.

2-1
Software Installation
 
This section explains how to install the software and gives an overview of the
main parts tool menus.
Topic Page
2.1 Software Installation 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Selecting Menus and Settings 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 TRF3750 Reference Latch Menu 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 TRF3750 N-Counter Latch 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 TRF3750 Function Latch 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 TRF3750 Initialization Latch 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 TRF3750 Set BIts Individually 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8 Parallel Port 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9 Help Menu 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10 Exit 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Software Installation
2-2
2.1 Software Installation
All necessary software to operate the serial interface is provided on the
enclosed CD-ROM.
Version 1.0 of the TRF3750 software allows full control and programmability
of all the different functions and modes of the TRF3750. The software is
GUI-based and employs an intuitive graphical environment. You can load the
software in the following ways:
1) Insert the CD-ROM into the computer to be used to operate the serial inter-
face.
2) Double click the file called setup.exe.
The installer prompts you to select the directory in which you wish to install the
program. The installer automatically installs the TRF3750 software, the
National Instruments LabVIEW run-time engine, and the LabWindows
run-time engine in one seamless installation. After the computer goes through
the automatic installation, you will be prompted to restart your computer. The
software was created using LabVIEW, but it does not require LabVIEW to be
installed on the PC. This is why the run0time engines are installed.
Once you restart, the program is ready to function. Ensure that you have
connected your PC’s parallel port cable to the TRF3750 EVM (connector J5).
3) Once the installation is complete, the software is launched by running
C:\TRF3750.exe.
Once you launch the program, it automatically runs and gives you several
options (icons).
Figure 2−1 shows the structure of the main menu.

Software Installation
2-3
Software Installation
Figure 2−1.Structure of the Main Menu

Selecting Menus and Settings
2-4
2.2 Selecting Menus and Settings
1) Left click the PARAMETER SELECTION ASSISTANT to display the menu
for configuring the PLL.
The menu is shown edited for:
-VCO frequency = 1960 MHz
-PFD frequency = 200 kHz
-Reference frequency (REFIN) = 10 MHz and
-Prescaler selection 16/17
2) Left click on the CALCULATE button and the program calculates the data-
set for the A counter and B counter. You also have the option of setting a
specific value directly in the A and B counters that equates to the set or
desired PFD frequency.
3) Left click the SEND CALCULATED VALUES to load the PLL registers.
4) Left click RETURN TO MAIN returns to the main menu.

TRF3750 Reference Latch Menu
2-5
Software Installation
2.3 TRF3750 Reference Latch Menu
-Select a menu item using the pulldown arrows.
-Press the SEND TO TRF3750 button to send the data to the register.
-Press the RETURN TO MAIN button to close the menu.
The palette settings displayed are typical and the R-value representing the
relationship between the reference 10-MHz oscillator and the 200-kHz
comparison frequency.

TRF3750 N-Counter Latch
2-6
2.4 TRF3750 N-Counter Latch
Figure 2−2 shows an example of the N-counter settings.
Figure 2−2.Example of N-Counter Latch

TRF3750 Function Latch
2-7
Software Installation
2.5 TRF3750 Function Latch
Use the Pull button to set the charge pump current and other function
latch-specific features supported.

TRF3750 Initialization Latch
2-8
2.6 TRF3750 Initialization Latch

TRF3750 Set BIts Individually
2-9
Software Installation
2.7 TRF3750 Set BIts Individually

Parallel Port
2-10
2.8 Parallel Port
The program assumes that the base address of your parallel port is
Hexadecimal 378. If that is not the case, you can change the base address by
left clicking on the parallel port configuration button. You can access the built-in
help file by left clicking on the HELP button. The program includes the
parameter assistant, which can help you choose divider ratios and parameters
depending on your choice of VCO frequency, prescaler value, and PFD
frequency. By simply Left clicking on each of the respective buttons brings up
a window from which you can control the individual registers and all the
settings. There is also an option to set all the bits of the serial interface
manually, if so desired.
If you have any questions or encounter any difficulties, contact
[email protected].