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SY87729/39L
Micrel, Inc.
The following steps allow the user to verify cycle-to-cycle
jitter of the SY87729/39L evaluation board:
1. Connect Power Source: The power supply should be
set to about 3.3V. Current consumption will be between
250mA and 300mA. Connect the positive power supply to
the red or yellow banana jack, J1, labeled “ V CC ” under it on
the silk screen. Connect the negative power supply to the
black banana jack, J2, labeled “ GND ” under it on the silk
screen.
2. Connect Clock Source: Use one of the two length
matched SMA patch cables to connect XTAL+ (J8) to
REFCLK+ (J3). Use the other of the two length matched
SMA patch cables to connect XTAL – (J7) to REFCLK –
(J4).
3. Connect Configuration Source: Attach the printer cable
between the PC parallel port and the SY87729/39L
evaluation board ’ s Centronics plug, J9. Launch the download
software and verify that either the message “ 729 Locked,"
“ 729 NOT Locked ” or “ 739 Locked," “ 739 NOT Locked"
appears at the upper right of the download application ’ s
window.
4. Configure the SY87729/39L Evaluation Board: Launch
a calculation module. Enter the target frequency in the “ 729
Output ” or “ 739 Output ” edit box and have the calculation
module determine the configuration parameters. 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
10
Evaluation Board
5. Verify Output Jitter: Connect CLKOUT+ (J5) to a TIA
that terminates into 50 ? . Connect a 50 ? termination to
CLKOUT – (J6). Measure the cycle-to-cycle jitter.
In the set up of Figure 2, a Wavecrest DTS-2079 is
used. It measures higher jitter than what is actually produced
by the SY87729/39L evaluation board because of the single-
ended nature of the Wavecrest inputs. Alternatively, a
sampling scope with histogram capability could be used,
along with a delay line, where the signal input is the
CLKOUT+ signal and the trigger input is the CLKOUT –
signal. Also, a high-speed real-time scope may be used
with Amherst M1 jitter analysis software.
Because the SY87729/39L generates clock frequencies
that are other than integer ratios of the input frequency,
some forms of jitter measurement cannot be taken with
certain types of test equipment. This is especially true when
using sampling (sometimes called equivalent time) scopes
to measure jitter histograms, as these require a trigger signal
separate from their input. Unless the SY87729/39L is
configured to perform an integer multiply, the trigger to the
scope can only be the complement clock output.
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