Silicon Laboratories Si5348-E User manual
UG362: Si5348-E Evaluation Board User's
Guide
The Si5348-E-EVB is used for evaluating the Si5348 Network Synchronizer Clock for
SyncE/1588 and Stratum 3/3E applications. The device revision is distinguished by a
white 1 inch x 0.187 inch label with the text “SI5348-E-EB” in the lower left-hand corner
of the board. (For ordering purposes only, the terms “EB” and “EVB” refer to the board
and the kit respectively. In this document, the terms are synonymous in context.) The
Si5348 contains three independent DSPLLs in a single IC with programmable jitter at-
tenuation bandwidth on a per DSPLL basis. The Si5348-E-EVB supports three inde-
pendent differential input clocks, two independent CMOS input clocks, and seven inde-
pendent output clocks via onboard SMA connectors. The Si5348-E-EVB can be con-
trolled and configured via a USB connection to a host PC running Silicon Labs’ next
generation Clock Builder Pro™ (CBPro™) software tool. Test points are provided on-
board for external monitoring of supply voltages.
The device revision is distinguished by a white 1 inch x 0.187 inch label with the text
“SI5348-E-EB” installed in the lower left hand corner of the board. (For ordering purpo-
ses only, the terms “EB” and “EVB” refer to the board and the kit respectively. For the
purpose of this document, the terms are synonymous in context.
This kit comes with an OCXO board SiOCXO1-EB as well as a TCXO board SiTCXO1-
EB. The OCXO or the TCXO are used on the reference input (REF) of the Si5348 to
evaluate the holdover stability of the network synchronizer clock. Both boards are not
needed at the same time, but they are both included in the kit to provide a comparison
of the resulting performance.
EVB FEATURES
• Powered from USB port or external +5 V
power supply via screw terminals
• Included SiOCXO1-EB reference OCXO
board allows for evaluation in standalone
and holdover mode.
• Included SiTCXO1-EB reference TCXO
board allows for evaluation in standalone
and holdover mode.
•CBPro™ GUI programmable VDD supply
allows device supply voltages from 3.3,
2.5, or 1.8 V
• CBPro™ GUI programmable VDDO
supplies allow each of the seven outputs
to have its own supply voltage selectable
from 3.3, 2.5, or 1.8 V
• CBPro™ GUI allows control and
measurement of voltage, current, and
power of VDD and all 8 VDDO supplies
• Status LEDs for power supplies and
control/status signals of Si5348
• SMA connectors for input clocks, output
clocks and optional external timing
reference clock
silabs.com | Building a more connected world. Rev. 0.1
Figure .1. Si5348-E-EVB
Figure .2. SiOCXO1-EB (left) SiTCXO1-EB (right)
silabs.com | Building a more connected world. Rev. 0.1
1. Si5348-E-EVB Functional Block Diagram, Support Documentation, and ClockBuilderPro™ Software
Below is a functional block diagram of the Si5348-E-EVB. This EVB can be connected to a PC via the main USB connector for pro-
gramming, control, and monitoring. See 2. Quick Start and Jumper Defaults for more information.
Si5348
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
Input
Termination
Input
Termination
Input
Termination
XA
XB
REF_IN
REF_INB
CLKIN_0
CLKIN_0B
CLKIN_1
CLKIN_1B
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_0
VDD_Core
VDD_3.3
VDDO_1
VDDO_2
VDDO_3
VDDO_4
VDDO_5
USB +5V
Connector
USB Aux +5V
Connector
Ext +5V
Connector
I2C
+5V
+5V_Aux
VDDMCU
5–250 MHz TCXO/OCXO
or REFCLK {
Input Clock 0 {
Input Clock 1 {
}Output Clock 0
}Output Clock 1
}Output Clock 2
}Output Clock 3
}Output Clock 4
}Output Clock 5
Power only
Power only
Control/
Status
INTR
Alarm_Status
Input
Termination
CLKIN_2
CLKIN_2B
{
VDDO_6 VDDO_6
CLKOUT_6
CLKOUT_6B
Output
Termination }Output Clock 6
Ext Aux +5V
Connector
SPI
Conn
Optional External
XAXB Ref Input {XAXB
Crystal/Term
Input Clock 3
Input Clock 4
CLKIN_3
CLKIN_4
Input Clock 2
Figure 1.1. Si5348-E-EVB Functional Block Diagram
All Si5348 schematics, BOMs, User’s Guides, and software can be found online at the following link: http:www.silabs.com/products/
clocksoscillators/pages/si538x-4x-evb.aspx
The SiOCXO1-EB User's Guide is located at: https://www.silabs.com/documents/public/user-guides/UG123.pdf
The SiTCXO1-EB User's Guide is located at: https://www.silabs.com/documents/public/user-guides/ug364-sitcxo1-evb-ug.pdf
UG362: Si5348-E Evaluation Board User's Guide
Si5348-E-EVB Functional Block Diagram, Support Documentation, and ClockBuilderPro™ Software
silabs.com | Building a more connected world. Rev. 0.1 | 3
2. Quick Start and Jumper Defaults
1. Install ClockBuilderPro desktop software from EVB support web page given in Section 2.
2. Connect USB cable from Si5348-E-EVB to PC with ClockBuilderPro software installed.
3. Connect the SIOCXO1-EB or SiTCXO1-EB to the reference input (REF) on the Si5348 using the included SMA connector.
4. Leave the jumpers as installed from the factory, and launch the ClockBuilderPro software.
5. You can use ClockBuilderPro to create, download, and run a frequency plan on the Si5348-E-EVB.
6. For the Si5348 data sheet, go to https://www.silabs.com/documents/public/data-sheets/si5348-e-datasheet.pdf.
7. For the Si5348 reference manual, go to http://www.silabs.com/documents/public/reference-manuals/si5348-e-family.pdf.
Table 2.1. Si5348-E EVB Jumper Defaults*
Location Type I = Installed O =
Open
Location Type I = Installed O =
Open
JP1 2 pin I JP23 2 pin O
JP2 2 pin I JP24 2 pin O
JP3 2 pin I JP25 2 pin O
JP4 2 pin I JP26 2 pin O
JP5 2 pin O JP27 2 pin O
JP6 2 pin O 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
JP22 2 pin O J36 5x2 Hdr All 5 installed
Note: Refer to the Si5348-E-EVB schematics for the functionality associated with each jumper.
UG362: Si5348-E Evaluation Board User's Guide
Quick Start and Jumper Defaults
silabs.com | Building a more connected world. Rev. 0.1 | 4
3. Status LEDs
Table 3.1. Si5348-E EVB 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 Core voltage present
D25 INTR Red MCU INTR (Interrupt) active
D21 READY Green MCU Ready
D24 BUSY Green MCU Busy
D5 LOL_T0B Blue Loss of Lock - DSPLL C
D6 LOL_T4B Blue Loss of Lock - DSPLL D
D8 LOS2B Blue Loss of Signal at IN2
D11 INTRB Blue Si5348 Interrupt Active
D12 LOS1B Blue Loss of Signal at IN1
D13 LOL_AB Blue Loss of Lock DSPLL A
D14 LOS0B Blue Loss of Signal at IN0
D27, D22, and D26 are illuminated when USB +5 V, Si5348-E-EVB +3.3 V, and Si5348 VDD or supply voltages, respectively, are
present. D25, D21, and D24 are status LEDs showing on-board MCU activity. LEDs D14, D12, and D8 indicate loss of signal at clock
inputs IN0, IN1, and IN2, respectively. LEDs D13, D5, and D6 indicate loss of lock for one of three internal DSPLLs (A, C, and D) re-
spectively. D11 indicates Si5348 interrupt output is active (as configured by Si5348 register programming). LED locations are highligh-
ted below with LED function name indicated on board silkscreen.
Figure 3.1. Si5348-E-EVB LED Locations
UG362: Si5348-E Evaluation Board User's Guide
Status LEDs
silabs.com | Building a more connected world. Rev. 0.1 | 5
4. External Reference Input (XA/XB)
An external timing reference (48 MHz XTAL) is used in combination with the internal oscillator to produce an ultra-low jitter reference
clock for the DSPLL and for providing a stable reference for the free-run and holdover modes. The Si5348-E-EVB can also accommo-
date an external reference clock instead of a crystal. To evaluate the device with an external REFCLK, C111 and C113 must be popula-
ted and XTAL Y1 removed (see figure below). The REFCLK can then be applied to SMA connectors J39 and J40.
Figure 4.1. External Reference Input Circuit
UG362: Si5348-E Evaluation Board User's Guide
External Reference Input (XA/XB)
silabs.com | Building a more connected world. Rev. 0.1 | 6
5. Clock Input and Output Circuits
5.1 Clock Input Circuits (REF/REFB, IN0/IN0B-IN2/IN2B, IN3, IN4)
The Si5348-E-EVB has eight SMA connectors (REF/REFB, IN0/IN0B–IN2/IN2B) for receiving external differential clock signals. The
REF/REFB differential input clock is intended to support a TCXO or OCXO, such as the included SiOCXO1-EB or the included SiTC-
XO1-EB, which determines the Si5348’s wander performance. (Please note that this input clock is different from the optional reference
clock that may be applied at XA/XB.) All differential input clocks are terminated as shown in the figure below. The only exception is that
the terminating 49.9 Ω resistor for REF is not installed. This is R84 corresponding to IN0's R76 in the figure below. The reason for this
exception is that single-ended TCXOs and OCXOs typically cannot drive a 50 Ω load. 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 configure inputs as single-ended, please refer to the Si5348 data sheet
or reference manual.
Figure 5.1. Differential Input Clock Termination Circuit
In addition, the Si5348-E-EVB supports two SMA connectors (IN3, IN4) for receiving external single-ended LVCMOS clocks. Each of
these clocks connects to its respective Si5348 pins via a single installed 0 Ω resistor. There are no other termination components on
the EVB.
UG362: Si5348-E Evaluation Board User's Guide
Clock Input and Output Circuits
silabs.com | Building a more connected world. Rev. 0.1 | 7
5.2 Clock Output Circuits (OUTx/OUTxB)
Each of the 14 output drivers (seven differential pairs, OUT0/OUT0B—OUT6/OUT6B) is ac-coupled to its respective SMA connector.
The output clock termination circuit is shown in the figure 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. In particular, if differential pair OUT6/OUT6B is configured for 1
Hz output, then the AC coupling output capacitors, C166 and C168, each need to be replaced by a 0 Ω resistor. (These capacitors are
the respective counterparts of the OUT0/OUT0B output capacitors, C25 and C27, in the figure below.) The Si5348-E-EVB provides
pads for optional output termination resistors and/or low-frequency capacitors. Note that components with schematic “NI” designation
are not normally populated on the Si5348-E-EVB and provide locations on the PCB for optional dc/ac terminations by the end user.
Figure 5.2. Output Clock Termination Circuit
UG362: Si5348-E Evaluation Board User's Guide
Clock Input and Output Circuits
silabs.com | Building a more connected world. Rev. 0.1 | 8
6. Using the Si5348-E-EVB and Installing ClockBuilderPro (CBPro) Desktop Software
6.1 Installing ClockBuilderPro (CBPro) Desktop Software
To install the CBPro software on any Windows 7 (or above) PC:
Go to http://www.silabs.com/CBPro and download ClockBuilderPro software.
Installation instructions and User’s Guide for ClockBuilder can be found at the download link shown above. Please follow the instruc-
tions as indicated.
6.2 Connecting the EVB to Your Host PC
Once ClockBuilderPro software is installed, connect to the EVB with a USB cable as shown below.
Figure 6.1. EVB Connection Diagram
6.3 Additional Power Supplies
The Si5348-EB comes pre-configured with jumpers installed at JP15 and JP16 (pins 1–2 in both cases) in order to select “USB”. These
jumpers, together with the components installed, configure the evaluation board to obtain all +5 V power solely through the main USB
connector at J37. This setup is the default configuration and should normally be sufficient.
The general guidelines for single USB power supply operation are listed below:
• Use either a USB 3.0 or USB 2.0 port. These ports are specified to supply 900 mA and 500 mA respectively at +5 V.
• If you are working with a USB 2.0 port and you are current limited, turn off enough DUT output voltage regulators to drop the total
DUT current ≤ 470 mA. (Note: USB 2.0 ports may supply > 500 mA. Provided the nominal +5 V drops gracefully by less than 10%,
the EVB will still work.)
• If you are working with a USB 2.0 and you are current limited and need all output clock drivers enabled, re-configure the EVB to
drive the DUT output voltage regulators from an external +5 V power supply as follows:
• Connect external +5 V power supply to terminal block J33 on the back side of the PCB.
• Move the jumper at JP15 from pins 1–2 USB to pins 2–3 EXT.
UG362: Si5348-E Evaluation Board User's Guide
Using the Si5348-E-EVB and Installing ClockBuilderPro (CBPro) Desktop Software
silabs.com | Building a more connected world. Rev. 0.1 | 9
6.4 Overview of ClockBuilderPro Applications
Note: The following instructions and screen captures may vary slightly depending on your version of ClockBuilder Pro.
The ClockBuilderPro installer will install two main applications:
Figure 6.2. Application #1: ClockbuilderPro Wizard
Use the CBPro Wizard to:
• Create a new design
• Review or edit an existing design
• Export: create in-system programming files
Figure 6.3. Application #2: EVB GUI
UG362: Si5348-E Evaluation Board User's Guide
Using the Si5348-E-EVB and Installing ClockBuilderPro (CBPro) Desktop Software
silabs.com | Building a more connected world. Rev. 0.1 | 10
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