Table of Contents
Advertisement
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
FEATURES
1.
The EVK is a complete working synthesizer, including VCOs.
2.
Board is controlled by an IBM PC–compatible computer through the printer port.
3.
Up to three boards can be operated independently through one printer port.
4.
A prototype area and mounting holes are provided for VCOs, mixers, and amplifiers.
5.
External reference input can be used.
6.
Five element loop filter is included.
7.
Frequency range of operation, step size and reference frequency can be changed in the control
program.
8.
Lock Detect, Out A, and Out B on any single board are accessible through the printer port.
CONTENTS OF EVALUATION KIT
1.
Assembled evaluation board.
2.
Nine–foot flat cable with four DB–25 male connectors.
3.
MC145220EVK manual.
4.
3.5 PC–compatible disk containing compiled program.
5.
PLL device data sheets.
GETTING STARTED
To perform basic functions, do the following:
1.
Plug in 12 volts at J8, observing the polarity marked on the board.
2.
Short circuit section 1 of the DIP switch (S1) and open circuit all other sections.
3.
Connect the supplied flat cable between the computer printer port and the DB–25 connector on
the board (J9).
4.
Type PLL at the DOS prompt. Then press enter.
5.
Type the number that corresponds with the type of board given in the on–screen menu. The
MC145220 may operate in single loop or dual loop mode. Then press Q.
You should now see the main menu displayed. There should be a signal present at J5 if single loop, or
J12 if dual loop. The frequency will be the current output frequency given in the main menu. If the signal
is not on the correct frequency, check to see if your printer port address is $278 (hexadecimal 278). If not,
then select the P menu item and enter the correct address. After returning to the main menu, select the
I menu item to send data to the board. You should now be on frequency.
MODIFICATIONS
The user may modify the hardware, such as utilizing a different VCO, by using the prototyping area of the
board. After such modifications are made, the default values in the software may need to be changed.
This is facilitated from the 'Select from the available options' screen.
Note that the on–board voltage regulators allow for a maximum VCO control voltage range of 0.5 – 4.5
volts.
MOTOROLA
Freescale Semiconductor, Inc.
SECTION 1 – HARDWARE
For More Information On This Product,
Go to: www.freescale.com
MC145220EVK
5
Advertisement
Table of Contents
