Microchip SY87729L/39L Handleiding

Microchip Niet gecategoriseerd SY87729L/39L

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M9999-071906
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
â– DC coupled and terminated PECL inputs
â– AC coupled PECL outputs
â– Programmable via any PC using printer cable
â– Includes a 27.0000MHz oscillator on board
FEATURES
SY87729L 10MHz to 365MHz
SY87739L 10MHz to 729MHz
FRACTIONAL-N SYNTHESIZERS
SuperCOM™
SY87729L
SY87739L
Evaluation Board
EVALUATION BOARD COMPONENTS
â– SY87729/39L evaluation board
â– SY87729/39L data sheet and this document
â– SY87729/39L software (download from
http://www.micrel.com/product-info/
fractional_n_synthesizers.shtml)
â– Two length-matched 1 foot SMA cables (optional,
user supplied)
â– PC running Windows (user supplied)
â– Printer cable, parallel-to-centronics (user supplied)
Rev.: B Amendment: /0
Issue Date: July 2006
The SY87729/39L are rate independent fractional-N
frequency synthesizer ICs. From a single reference source,
they can generate any clock frequency from 10MHz to
729MHz very accurately.
This document provides a detailed description of the
evaluation board, evaluation procedure and the simple
conguration software it uses. Complete information in this
document includes:
1. Test setup and measuring frequency output with
a signal generator.
2. Test setup and measuring jitter with an internal
reference oscillator.
3. Download and use of the conguration software
4. Board schematic and Bill of Materials.
SuperCOM is a trademark of Micrel, Inc.
Power
Banana Jack
(J1)
Synthesized
Clock Outputs
Reference
Oscillator
Outputs
Reference
Clock Inputs
Centronics
Programming Port
Ground
Banana Jack
(J2)
2
SY87729/39L
Evaluation Board
Micrel, Inc.
M9999-071906
hbwhelp@micrel.com or (408) 955-1690
GETTING STARTED
Before powering up the SY87729/39L evaluation board,
you must do the following:
1. Familiarize yourself with the SY87729/39L
evaluation board.
2. Make sure that you are properly grounded.
3. Read and understand this document in its
entirety.
To program the desired output frequency, you will need
a PC running Windows, with the SY87729/39L evaluation
board software installed, and a printer cable attached
between the PC and the SY87729/39L evaluation board.
The software downloads conguration information to the
SY87729/39L device.
If using an external signal source, that source must be
able to generate LVPECL level signals. The inputs are DC
coupled, terminated in 50 to VΩCC–2V.
This section discusses how to make two common
measurements with the SY87729/39L evaluation board.
What you will need:
1. The SY87729/39L evaluation board.
2. Either two length-matched one foot SMA cables,
or a digital signal generator such as the
HP8133A.
3. A PC with a parallel port, running Windows.
4. If you are running Windows NT, Windows 2000,
or Windows XP, you will need “Direct-IO”
shareware.
5. A printer cable, one end is a parallel interface,
the other end is a Centronics interface.
6. The SY87729/39L evaluation board software
(download from http://www.micrel.com).
7. A frequency counter.
8. A power supply capable of delivering at least
3.3V at 0.5A.
9. A self-triggering scope or a time interval analyzer
(TIA).
First, we show how to use an external signal generator and
how to measure the frequency of the output. Second, we
show how to use the supplied reference oscillator and how
to measure cycle-to-cycle jitter of the output. Please refer to
Figures 1 and 2.
TEST SET-UP
PC Running
Download
Application
Printer
Cable
Frequency
Counter
Power
Supply
Signal
Generator
SY87729/39L
Evaluation
Board
Figure 1. Test Set-Up with
Signal Generator
PC Running
Download
Application
Printer
Cable
Time Interval
Analyzer (TIA)
Power SupplyPatch Cables
SY87729/39L
Evaluation Boad
Figure 2. Test Set-Up with
Internal Reference Oscillator
3
SY87729/39L
Evaluation Board
Micrel, Inc.
M9999-071906
hbwhelp@micrel.com or (408) 955-1690
EVALUATION PROCEDURE
Downloading the Application Software
Micrel’s SY87729/39L accepts conguration information
via a bit-serial interface. To program the device, the user
must download 32 bits of configuration information into
SY87729/39L. Micrel provides a download application for
use with the SY87729/39L evaluation board.
With this software, the user may select any desired output
frequency that the SY87729/39L can generate, between
10MHz and 729MHz. The software will automatically
determine the configuration parameters that most accurately
generate the desired frequency. These parameters,
explained in the data sheets, may be viewed or modied.
They may also be downloaded to the SY87729/39L-EVAL
circuit board through a printer cable attached between the
PC and the SY87729/39L evaluation board.
To download the software, point your web browser to the
following URL, and save the les to your PC: You should
download the applications 739ifier , 739ev and 739ev2.“ ” “ ” “ ”
http://www.micrel.com/page.do?page=product-info/
fractional_n_synthesizers.shtml
Installing the Application Software
Create a folder just for these applications. Download all
three application les into this folder.
Running Win95, Win98, or WinME
If you are running any of these Windows operating
systems, you have completed downloading all the software
you will need. You will not need the application file 739ev2“ ”
and may delete it at your convenience. The application le
“ ”739ev allows you to access one of two parallel ports, the
default one located at base I/O address 0x378 (usually
known as LPT1) and a secondary one located at base I/O
address 0x278 (usually known as LPT2).
The application program “739ev2” is identical to
application file 739ev , except that it defaults to using LPT2“ ”
rst. This is of no use to the user when running Win95,
Win98, or WinME. Please proceed to the section Using the“
Application Software.”
Running WinNT, Win2000, or WinXP
Besides downloading the applications, you must also
decide what parallel port or ports you will use the applications
with. Since WinNT, Win2000, and WinXP do not permit
direct access to the I/O ports, you must also download and
install a shareware to allow this.
The usual case is to allow downloads on the default
parallel port, LPT1. You may instead decide to allow
downloads only on LPT2, if your computer is equipped with
a second parallel port or you may also decide to allow two
SY87729/39L-EVAL boards to be attached, one to each
LPT1 and LPT2. Table 1 details the I/O ports you must
allow access to, based on which parallel port or ports you
will use with SY87729/39L evaluation board.
Case Base I/O Addresses Needed
Access to LPT1 0x378-0x37A, 0x778-0x77A
Access to LPT2 0x278-0x27A, 0x678-0x67A
Access to both LPT1 and LPT2 0x278-0x27A, 0x378-0x37A,
0x678-0x67A, 0x778-0x77A
Table 1. I/O Addresses to Use
Once you have decided which parallel port or ports you
will connect the SY87729/39L evaluation board to, you must
choose which download application le to keep. If you will
access either LPT1 only, or both LPT1 and LPT2, then
delete the application 739ev2 at this time. If you will access“ ”
only LPT2, then delete the application at this time,“ ”739ev
and then rename the application 739ev2 to 739ev.“ ” “ ”
Now, you must download a shareware called “ ”Direct-IO
that allows the SY87729/39L evaluation board software
application access to the parallel ports at a low level. The
“ ”Direct-IO shareware is available at:
http://www.direct-io.com
At the time of this writing, you have a free 30-day trial
evaluation period, after which time you must have it
registered. After you have completed download of “Direct-
IO," you must install the program. Follow the installation
instructions for that program. Please note that, in some
cases, the install may fail. In this case, you will need a
systems administrator to install Direct-IO for you.“ ”
As the final step of application installation, you must
congure Direct-IO“ ” to give the SY87729/39L evaluation
board software permission to access to the appropriate I/O
addresses. This is accomplished through its control panel.
To access the Direct-IO control panel, select:“ ”
Start Programs Direct IO Control Panel➯ ➯ ➯
If not already active, click the I/O Ports tab. The “ ” “ ”Hex
button should already be pressed. You must enter the
appropriate address ranges in the and edit“ ”Begin “ ”End
boxes, and then push the button. The goal is to have“ ”Add
the required I/O addresses appear in the Active Ports“ ”
section of the control panel. For example, to“ ”Direct-IO
allow access only to LPT1, you must allow access to two
ranges of I/O addresses. The rst range is 0x378-0x37A.
Thus, you type in the edit box, and you type“ ”378 “ ”Begin
“ ” “ ” “ ”37A in the End edit box. The Direct-IO control panel
should look like Figure 3.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: SY87729L/39L

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