Microchip SY87729L/39L Manual

Microchip Ikke kategoriseret SY87729L/39L

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1
M9999-071906
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
■DC coupled and terminated PECL inputs
■AC coupled PECL outputs
■Programmable via any PC using printer cable
■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
■SY87729/39L evaluation board
■SY87729/39L data sheet and this document
■SY87729/39L software (download from
http://www.micrel.com/product-info/
fractional_n_synthesizers.shtml)
■Two length-matched 1 foot SMA cables (optional,
user supplied)
■PC running Windows (user supplied)
■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

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: SY87729L/39L

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