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Micrel, Inc.
FEATURES
DC coupled and terminated PECL inputs
AC coupled PECL outputs
Programmable via any PC using printer cable
Includes a 27.0000MHz oscillator on 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)
Reference
Oscillator
Outputs
Reference
Clock Inputs
Centronics
Programming Port
SuperCOM is a trademark of Micrel, Inc.
M9999-071906
hbwhelp@micrel.com or (408) 955-1690
SY87729L 10MHz to 365MHz
SY87739L 10MHz to 729MHz
FRACTIONAL-N SYNTHESIZERS
DESCRIPTION
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
configuration 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 configuration software
4. Board schematic and Bill of Materials.
Power
Banana Jack
(J1)
1
SuperCOM™
Evaluation Board
Evaluation Board
Ground
Banana Jack
(J2)
Synthesized
Clock Outputs
Rev.: B
Issue Date: July 2006
SY87729/39L
SY87729L
SY87739L
Amendment: /0
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Summary of Contents for Micrel SY87729L
- Page 1 Power Banana Jack Ground (J1) Banana Jack (J2) Reference Oscillator Outputs Reference Synthesized Clock Inputs Clock Outputs Centronics Programming Port SuperCOM is a trademark of Micrel, Inc. Rev.: B Amendment: /0 M9999-071906 Issue Date: July 2006 hbwhelp@micrel.com or (408) 955-1690...
-
Page 2: Getting Started
Figures 1 and 2. Figure 1. Test Set-Up with Signal Generator SY87729/39L Evaluation Boad Patch Cables Power Supply PC Running Download Application Time Interval Printer Analyzer (TIA) Cable Figure 2. Test Set-Up with Internal Reference Oscillator M9999-071906 hbwhelp@micrel.com or (408) 955-1690... -
Page 3: Evaluation Procedure
0x278-0x27A, 0x678-0x67A must download 32 bits of configuration information into Access to both LPT1 and LPT2 0x278-0x27A, 0x378-0x37A, SY87729/39L. Micrel provides a download application for 0x678-0x67A, 0x778-0x77A use with the SY87729/39L evaluation board. Table 1. I/O Addresses to Use With this software, the user may select any desired output... - Page 4 Figure 5. Correct I/O Addresses for LPT1 Access Consulting Table 1, If you are accessing only LPT2, the “Direct-IO” control panel should look like Figure 6. Figure 8. Including “739ev” in the List of Allowed Processes M9999-071906 hbwhelp@micrel.com or (408) 955-1690...
- Page 5 27MHz, the frequency Micrel recommends when synthesizing clocks for standard protocols. This also happens FAILED, like in Figure 11. It is VERY IMPORTANT to note...
- Page 6 SY87729/39L. In the above example, the wrapper synthesizer is used to obtain the best possible actual output frequency. If the wrapper synthesizer is not used, the calculation module should look like that in Figure 13. M9999-071906 hbwhelp@micrel.com or (408) 955-1690...
- Page 7 The purpose of the download module is to download the download application indicates, in the status, whether the configuration parameters calculated by the calculation evaluation board has an SY87729L or an SY87739L. module, to the SY87729/39L device. In this way, the user Once you have connected the SY87729/39L evaluation...
- Page 8 15, 16, 17, or 18. If the “M” configuration edit box contains one of 31 or 32, then the “N” configuration edit box must also contain one of 31 or 32. Table 2. Possible Error Messages M9999-071906 hbwhelp@micrel.com or (408) 955-1690...
- Page 9 A PC with the evaluation software installed value of V . For a V of 3.3V, the high level of the clock signal should be between 2.135V and 2.42V. The low level A printer cable M9999-071906 hbwhelp@micrel.com or (408) 955-1690...
- Page 10 Have the download module configure the SY87729/39L evaluation board, and verify that the indicator at the upper right of the download application is green, and that it says “729 Locked," or “739 Locked.” M9999-071906 hbwhelp@micrel.com or (408) 955-1690...
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Page 11: Evaluation Board Schematics
9 10 11 12 13 14 15 16 0.1µF Note: R12 and R13 near U1 74LCX240 XTAL— 2.21kΩ PROGSK PROGDI PROGCS Saronix SEL2431C Note: Insert for SY87729L only XTAL+ 74LCX240 2.21kΩ 475Ω Note: Connector Cent36 0.1µF 0.1µF Note: R14 and R15 in-line Insert for SY87739L only for back termination Figure 19. -
Page 12: Bill Of Materials
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
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