Silicon Laboratories Si5395 Manuale utente
UG335: Si5395 Evaluation Board User's
Guide
The Si5395 EVB is used for evaluating the Si5395 Any-Frequency, Any-Output, Jitter-
Attenuating Clock Multiplier. There are two different EVBs for the Si5395. There is a
Grade A and a Grade P board. This user guide is intended for both versions of the
Si5395 EVBS. The device grade and revision is distinguished by a white 1 inch x 0.187
inch label installed in the lower left hand corner of the board. In the example below, the
label "SI5395A-A-EB" indicates the evaluation board has been assembled with an
Si5395 device, Grade A, Revision A, installed. (For ordering purposes only, the terms
“EB” and “EVB” refer to the board and the kit, respectively. For the purpose of this docu-
ment, the terms are synonymous in context.)
KEY FEATURES
• Powered from USB port or external power
supply
• Onboard 48 MHz XTAL or Reference SMA
Inputs allow holdover mode of operation on
the Si5395
• CBPro™ GUI programmable VDD supply
allows device to operate from 3.3, 2.5, or
1.8 V
• CBPro GUI programmable VDDO supplies
allow each of the 10 outputs to have its
own power supply voltage selectable from
3.3, 2.5, or 1.8 V
• CBPro GUI-controlled voltage, current, and
power measurements of VDD and all
VDDO supplies
• Status LEDs for power supplies and
control/status signals of Si5395
• SMA connectors for input clocks, output
clocks, and optional external timing
reference clock
silabs.com | Building a more connected world. Rev. 0.96
1. Functional Block Diagram
Below is a functional block diagram of the Si5395 EVB. This evaluation board can be connected to a PC via the main USB connector
for programming, control, and monitoring. See 3. Quick Start or 10.3 Overview of ClockBuilderPro Applications for more information.
Si5395
CLKOUT_0
CLKOUT_0B
Output
Termination
CLKOUT_1
CLKOUT_1B
Output
Termination
CLKOUT_2
CLKOUT_2B
Output
Termination
CLKOUT_3
CLKOUT_3B
Output
Termination
CLKOUT_4
CLKOUT_4B
Output
Termination
CLKOUT_5
CLKOUT_5B
Output
Termination
CLKOUT_6
CLKOUT_6B
Output
Termination
CLKOUT_7
CLKOUT_7B
Output
Termination
48 MHz
XTAL
Input
Termination
Input
Termination
Input
Termination
XA
XB
CLKIN_0
CLKIN_0B
CLKIN_1
CLKIN_1B
CLKIN_2
CLKIN_2B
Power Supply
C8051F380
MCU
+
Peripherals
I2C/SPI Bus
VDDO_0
VDD_Core
VDD_3.3
VDDO_1
VDDO_2
VDDO_3
VDDO_4
VDDO_5
VDDO_6
VDDO_7
VDDO_0
VDD_Core
VDD_3.3
VDDO_1
VDDO_2
VDDO_3
VDDO_4
VDDO_5
VDDO_6
VDDO_7
Main USB
Connector
Aux USB
Connector
Ext +5V
Connector
I2C/SPI Bus
+5V_USB
+5V_Aux
+5V_Ext
VDDMCU
Input Clock 0 {
Input Clock 1 {
Input Clock 2 {
}Output Clock 0A
}Output Clock 0
}Output Clock 1
}Output Clock 2
}Output Clock 3
}Output Clock 4
}Output Clock 5
}Output Clock 6
Power only
Power only
VDDO_8
VDDO_9
VDDO_8
VDDO_9
CLKOUT_8
CLKOUT_8B
Output
Termination }Output Clock 7
CLKOUT_9
CLKOUT_9B
Output
Termination }Output Clock 8
Control/
Status
INTR
Alarm_Status
Input
Termination
CLKIN_3/FB_IN
CLKIN_3/FB_INB
Input Clock 3 {
CLKOUT_9A
CLKOUT_9AB
Output
Termination }Output Clock 9A
Output
Termination }Output Clock 9
CLKOUT_0A
CLKOUT_0AB
VDDO_9A VDDO_9A
VDDO_0A VDDO_0A
Figure 1.1. Si5395 EB Functional Block Diagram
UG335: Si5395 Evaluation Board User's Guide
Functional Block Diagram
silabs.com | Building a more connected world. Rev. 0.96 | 2
2. Si5395 EVB Support Documentation and ClockBuilderPro™ Software
All Si5395 EVB schematics, BOMs, User’s Guides, and software can be found online at: http://www.silabs.com/products/clocksoscilla-
tors/pages/si539x-evb.aspx.
UG335: Si5395 Evaluation Board User's Guide
Si5395 EVB Support Documentation and ClockBuilderPro™ Software
silabs.com | Building a more connected world. Rev. 0.96 | 3
3. Quick Start
1. Install the ClockBuilderPro desktop software from http://www.silabs.com/CBPro.
2. Connect a USB cable from Si5395 EVB to the PC where the software was installed.
3. Leave the jumpers as installed from the factory, and launch the ClockBuilderPro software.
4. You can use ClockBuilderPro to create, download, and run a frequency plan on the Si5395 EVB.
5. For the Si5395 data sheet, go to http://www.silabs.com/timing.
UG335: Si5395 Evaluation Board User's Guide
Quick Start
silabs.com | Building a more connected world. Rev. 0.96 | 4
4. Jumper Defaults
Table 4.1. Si5395 EVB Jumper Defaults1
Location Type I= Installed
0 = Open Location Type I = Installed
0 = Open
JP1 2-pin O JP23 2-pin O
JP2 2-pin I JP24 2-pin O
JP3 2-pin O JP25 2-pin O
JP4 2-pin I JP26 2-pin O
JP5 2-pin I JP27 2-pin O
JP6 2-pin I JP28 2-pin O
JP7 2-pin I JP29 2-pin O
JP8 2-pin O JP30 2-pin O
JP9 2-pin O JP31 2-pin O
JP10 2-pin I JP32 2-pin O
JP13 2-pin O JP33 2-pin O
JP14 2-pin I JP34 2-pin O
JP15 3-pin 1 to 2 JP35 2-pin O
JP16 3-pin 1 to 2 JP36 2-pin O
JP17 2-pin O JP38 3-pin All Open
JP18 2-pin O JP39 2-pin O
JP19 2-pin O JP40 2-pin O
JP20 2-pin O JP41 2-pin O
JP21 2-pin O J36 5 x 2 Hdr All 5 installed
JP22 2-pin O
Note:
1. Refer to the Si5395 EVB schematics for the functionality associated with each jumper.
UG335: Si5395 Evaluation Board User's Guide
Jumper Defaults
silabs.com | Building a more connected world. Rev. 0.96 | 5
5. Status LEDs
Location Silkscreen Color Status Function Indication
D27 5VUSBMAIN Blue Main USB +5 V present
D22 3P3V Blue DUT +3.3 V is present
D26 VDD DUT Blue DUT VDD voltage present
D25 INTR Red MCU INTR (Interrupt) active
D21 READY Green MCU Ready
D24 BUSY Green MCU Busy
D27, D22, and D26 are illuminated when USB +5 V, Si5395 +3.3 V, and Si5395 VDD supply voltages, respectively, are present. D25,
D21, and D24 are status LEDs showing on-board MCU activity.
Figure 5.1. Status LEDs
UG335: Si5395 Evaluation Board User's Guide
Status LEDs
silabs.com | Building a more connected world. Rev. 0.96 | 6
6. External Reference Input (XA/XB)
An external reference (XTAL) is used in combination with the internal oscillator to produce an ultra-low-jitter reference clock for the
DSPLL and to provide a stable reference for the free-run and holdover modes. The Si5395 EVB can also accommodate an external
reference clock instead of a crystal. To evaluate the device with a REFCLK, C111 and C113 must be populated and the XTAL removed
(see the figure below). Also, R197 and R202 must be populated. The REFCLK can then be supplied to J39 and J40. In the case of the
Si5395J-A, which is the grade with the xtal internal to the device, there will be no external xtal supplied on the board and no input from
Ref_XA and Ref_XB. In this case, it is advised to remove R197 and R202.
Figure 6.1. External Reference Input Circuit
UG335: Si5395 Evaluation Board User's Guide
External Reference Input (XA/XB)
silabs.com | Building a more connected world. Rev. 0.96 | 7
7. Clock Input Circuits (INx/INxB)
The Si5395 EVB has eight SMA connectors (IN0, IN0B – IN3, IN3B) for receiving external clock signals. All input clocks are terminated
as shown below. Note that input clocks are ac-coupled and 50 Ω terminated. This represents four differential input clock pairs. Single-
ended clocks can be used by appropriately driving one side of the differential pair with a single-ended clock. For details on how to con-
figure inputs as single-ended, refer to the Si5395 data sheet.
Figure 7.1. Input Clock Termination Circuit
UG335: Si5395 Evaluation Board User's Guide
Clock Input Circuits (INx/INxB)
silabs.com | Building a more connected world. Rev. 0.96 | 8
8. Clock Output Circuits (OUTx/OUTxB)
Each of the twenty-four output drivers (12 differential pairs) is ac-coupled to its respective SMA connector. The output clock termination
circuit is shown below. The output signal will have no dc bias. If dc coupling is required, the ac coupling capacitors can be replaced with
a resistor of appropriate value. The Si5395 EVB provides pads for optional output termination resistors and/or low-frequency capacitors.
Note that components with the schematic “NI” designation are not normally populated on the Si5395 EVB and provide locations on the
PCB for optional dc/ac terminations by the end user.
Figure 8.1. Output Clock Termination Circuit
UG335: Si5395 Evaluation Board User's Guide
Clock Output Circuits (OUTx/OUTxB)
silabs.com | Building a more connected world. Rev. 0.96 | 9
9. Installing ClockBuilderPro (CBPro) Desktop Software
To install the CBOPro software on any Windows 7 (or above) PC, go to http://www.silabs.com/CBPro and download the ClockBuilder-
Pro software.
Installation instructions and User’s Guide for ClockBuilderPro can be found at the download link shown above.
UG335: Si5395 Evaluation Board User's Guide
Installing ClockBuilderPro (CBPro) Desktop Software
silabs.com | Building a more connected world. Rev. 0.96 | 10
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