Silicon Laboratories Si5345-EVB User Manual
Si5345-EVB
Si5345 EVALUATION BOARD USER’S GUIDE
Description
The Si5345-EVB is used for evaluating the Si5345
Any-Frequency, Any-Output, Jitter-Attenuating Clock
Multiplier. The Si5345 combines 4th generation DSPLL
and Multisynth
clock generation for applications that required the
highest level of jitter performance. The Si5345-EVB has
4 independent input clocks and 10 independent output
clocks. The Si5345-EVB can be controlled and
configured using the Clock Builder Pro
software tool.
technologies to enable any-frequency
(CB Pro)
EVB Features
Powered from USB port or external power supply.
Onboard 48 MHz XTAL or Reference SMA Inputs
allow holdover mode of operation on the Si5345.
CBPro GUI programmable V
device to operate from 3.3, 2.5, or 1.8 V.
CBPro GUI programmable V
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 V
Status LEDs for power supplies and control/status
signals of Si5345.
SMA connectors for input clocks, output clocks, and
optional external timing reference clock.
and all V
DD
supply allows
DD
supplies allow each
DDO
supplies.
DDO
Rev. 1.1 5/15 Copyright © 2015 by Silicon Labs Si5345-EVB
Figure 1. Si5345 Evaluation Board
Si5345-EVB
1. Functional Block Diagram
Below is a functional block diagram of the Si5345-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 “10.3. Overview of
ClockBuilderPro Applications” for more information.
Figure 2. Si5345-EVB Functional Block Diagram
2 Rev. 1.1
Si5345-EVB
2. Si5345-EVB Support Documentation and ClockBuilderPro Software
All Si5345 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
3. Quick Start
1. Install ClockBuilderPro desktop software from http://www.silabs.com/CBPro.
2. Connect a USB cable from Si5345-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
5. For the Si5345 data sheet, go to http://www.silabs.com/timing.
to create, download, and run a frequency plan on the Si5345-EVB.
4. Jumper Defaults
Si5345 EVB Jumper Defaults
Location Type
JP1 2 pin O JP23 2 pin O
JP2 2 pin I
JP3 2 pin O
JP4 2 pin I
JP5 2 pin I
JP6 2 pin I
JP7 2 pin I
JP8 2 pin O
JP9 2 pin O
JP10 2 pin I
JP13 2 pin O
JP14 2 pin I
JP15 3 pin 1 to 2
JP16 3 pin 1 to 2
JP17 2 pin O
JP18 2 pin O
JP19 2 pin O
JP20 2 pin O
JP21 2 pin O
JP22 2 pin O J36 5x2 Hdr All 5 installed
I = Installed
0 = Open
Location Type
JP24 2 pin O
JP25 2 pin O
JP26 2 pin O
JP27 2 pin O
JP28 2 pin O
JP29 2 pin O
JP30 2 pin O
JP31 2 pin O
JP32 2 pin O
JP33 2 pin O
JP34 2 pin O
JP35 2 pin O
JP36 2 pin O
JP38 3 pin all open
JP39 2 pin O
JP40 2 pin O
JP41 2 pin O
I = Installed
0 = Open
Refer to the Si5345 EVB schematics for the functionality associated with each jumper.
Rev. 1.1 3
Si5345-EVB
5. Status LEDs
Si5345 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 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, Si5345 +3.3 V, and Si5345 VDD supply voltages, respectively,
are present. D25, D21, and D24 are status LEDs showing on-board MCU activity.
4 Rev. 1.1
Figure 3. Status LEDs
Si5345-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
Si5345-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 Figure 4 below). The REFCLK can then
be supplied to J39 and J40.
Figure 4. External Reference Input Circuit
Rev. 1.1 5
Si5345-EVB
7. Clock Input Circuits (INx/INxB)
The Si5345-EVB has eight SMA connectors (IN0, IN0B–IN3, IN3B) for receiving external clock signals. All input
clocks are terminated as shown in Figure 5 below. Note input clocks are AC coupled and 50 ohm 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 Si5345 data sheet.
Figure 5. Input Clock Termination Circuit
8. Clock Output Circuits (OUTx/OUTxB)
Each of the twenty output drivers (10 differential pairs) is AC coupled to its respective SMA connector. The output
clock termination circuit is shown in Figure 6 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 Si5345-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 Si5345-EVB and provide locations on the PCB for
optional DC/AC terminations by the end user.
Figure 6. Output Clock Termination Circuit
6 Rev. 1.1
Loading...