Silicon Laboratories Si5344-EVB User Manual
Si5344-EVB
Si5344 EVALUATION BOARD USER’S G UIDE
Description
The Si5344-EVB is used for evaluating the Si5344 AnyFrequency, Any-Output, Jitter Attenuating Clock
Multiplier. The Si5344 combines 4th generation DSPLL
and Multisynth
clock generation for applications that require the highest
level of jitter performance. The Si5344-EVB has 4
independent input clocks and 10 independent output
clocks. The Si5344-EVB can be controlled and
configured using the ClockBuilder Pro
software tool
Si5344 Evaluation Board
TM
technologies to enable any-frequency
TM
(CBProTM)
Features
Powered from USB port or external power supply
Onboard 48 MHz XTAL or Reference SMA Inputs
allow holdover mode of operation on the Si5344.
CBPro
device to operate from 3.3, 2.5, or 1.8 V.
CBPro
each of the 10 outputs to have its own supply voltage
selectable from 3.3, 2.5, or 1.8 V
CBPro
measurements of VDD and all VDDO supplies.
Status LEDs for power supplies and control/status
signals of Si5344
SMA connectors for input clocks, output clocks, and
optional external timing reference clock
TM
GUI-programmable VDD supply allows
TM
GUI-programmable VDDO supplies allow
TM
GUI-controlled voltage, current, and power
Rev. 1.0 Copyright © 2015 by Silicon Laboratories Si5344-EVB
Si5344-EVB
1. Functional Block Diagram
Below is a functional block diagram of the Si5344-EVB. This EVB can be connected to a PC via the main USB
connector for programming, control, and monitoring. See Section “3. Quick Start” or Section “9. Installing
ClockBuildPro (CBPro) Desktop Software” for more information.
Figure 1. Si5344-EVB Functional Block Diagram
2 Rev. 1.0
Si5344-EVB
2. Si5344 EVB Support Documentation and ClockBulderProTM Software
All Si5344 schematics, BOMs, User’s Guides, and software can be found on-line at the following link:
http://www.silabs.com/products/clocksoscillators/pages/si538x-4x-evb.aspx
3. Quick Start
1. Install ClockBuilderPro™ desktop software: http://www.silabs.com/CBPro
2. Connect a USB cable from the Si5344-EVB to the PC where the software is 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 Si5344-EVB.
5. For the Si5344 data sheet go here: http://www.silabs.com/timing
4. Jumper Defaults
Si5340 EVB Jumper Defaults
Location Type I = Installed
0 = Open
JP1 2 pin I JP14 2 pin O
JP2 2 pin I JP15 2 pin O
JP3 2 pin O JP16 3 pin all open
JP4 2 pin O JP17 3 pin all open
JP5 3 pin 1 to 2 JP18 2 pin O
JP6 2 pin O JP19 2 pin O
JP7 2 pin O JP20 3 pin all open
JP8 2 pin O JP21 3 pin
JP9 2 pin O JP22 2 pin O
JP10 2 pin O JP23 2 pin O
JP11 2 pin O JP24 3 pin all open
JP12 2 pin O
Location Type I = Installed
0 = Open
all open
JP13 2 pin O JP17 5x2 Hdr All 5 installed
Note: Refer to the Si5344 EVB Schematics for the functionality associated with each jumper.
Rev. 1.0 3
Si5344-EVB
5. Status LEDs
Si5340 EVB Status LEDs
Location Silkscreen Color Status Function Indication
D5 INTRB Blue DUT Interrupt
D7 LOLB Blue DUT Loss of Lock
D8 LOSXAXBB Blue DUT Loss of Reference
D11 +5V MAIN Green Main USB +5V present
D12 READY Green MCU Ready
D13 BUSY Green MCU Busy
D11 is illuminated when USB +5V supply voltage is present. D12 and D13 are status LEDs showing on-board MCU
activity.
Figure 2. Status LEDs
4 Rev. 1.0
Si5344-EVB
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 for providing a stable reference for the free-run and holdover modes. The
Si5344-EVB can also accommodate an external reference clock instead of a crystal. To evaluate the device with a
REFCLK, C93 and C94 must be populated and the XTAL removed (see Figure 3). The REFCLK can then be
applied to J25 and J26.
Figure 3. External Reference Input Circuit
7. Clock Input Circuits (INx/INxB and FB-IN/FB-INB)
The Si5344-EVB has eight SMA connectors (IIN0/IN0B – IN2/IN2B and IN3(FB_IN)/IN3B(FB_INB)) for receiving
external clock signals. All input clocks are terminated as shown in Figure 4.
Input clocks are AC coupled and 50- terminated. This represents 4 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 Si5344 data sheet.
Figure 4. Input Clock Termination Circuit
Rev. 1.0 5
Si5344-EVB
8. Clock Output Circuits (OUTx/OUTxB)
Each of the 8 outputs (4 differential pairs) is AC coupled to its respective SMA connector. The output clock
termination circuit is shown in Figure 5. The output signal has no DC bias. If DC coupling is required, the AC
coupling capacitors can be replaced with a resistor of appropriate value. The Si5344-EVB provides pads for
optional output termination resistors and/or low frequency capacitors.
Note: Components with schematic “NI” designation are not normally populated on the Si5344-EVB and provide locations on
the PCB for optional DC/AC terminations by the end user.
Figure 5. Output Clock Termination Circuit
9. Installing ClockBuildPro (CBPro) Desktop Software
To install the CBPro software on any Windows 7 (or later version) PC do the following:
1. Go to http://www.silabs.com/CBPro/ and download ClockBuilderPro™ software.
2. Installation instructions and User’s Guide for ClockBuilderPro™ can be found at the download link shown
above. Please follow the instructions as indicated.
10. Using Si5344 EVB
10.1. Connecting the EVB to Your Host PC
Once ClockBuilderPro™ software in installed, connect to the EVB with a USB cable as shown in Figure 6.
6 Rev. 1.0
Figure 6. EVB Connection Diagram
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