Si5328-EVB
Rev. 0.1
7
The Si5328-EVB is configured with an on-board TCXO that is suitable for G.8262 applications and has a clipped
sine wave output. For purposes of evaluation, a different TCXO/OCXO can be installed on the board. A TXCO with
a CMOS output can be used as well as an external XAXB reference oscillator. Table 2 lists the components that
need to changed to accommodate these options:
Silkscreen arrows point to these components to assist in identifying them. They are located on the bottom of the
board. J14 is a 10-pin ribbon header that provides an external path to monitor the status pins.
J17 is a 10 pin ribbon header that provides an external path to serially communicate with the Any-Frequency
Precision Clock.
To control the Si5328 that is on the Evaluation Board from an external serial port, open the Register Programmer,
connect to the Evaluation Board, go to Options in the top toolbar, and select “Switch To External Control Mode”.
To control an Si5328 that is on an external target board from the Evaluation Board using its serial port, tie pin 9 of
J17 low so that the on-board Si5328 is constantly being held in reset. This will force it to disable its SDA_SDO
output buffer.
J1 and J2 are edge mount SMA connectors that are used, if so configured, to supply an external single-ended or
differential reference oscillator.
Table 2. Status Header, J14
Component
CMOS Output
Clipped Sine Wave
External TCXO
R9
493
nopop
50
R61
nopop
nopop
0
R62
493
50
nopop
Table 3. Status Header, J14
J14
Pin
Comment
J14.1
LOL
J14.3
C1B
J14.5
C2B
J14.7
CS_CA
clock active
J14.9
DUT_PWR
Table 4. External Serial Port Connector, J17
J17
Pin
Comment
J17.1
SDA_SDO
J17.3
SCL_SCLK
J17.5
SDI
J17.7
A2_SS
J17.9
DUT_RST_B
not reset
