Silicon Laboratories Si5341-EVB User Manual

Si5341-EVB

Si5341 EVALUATION BOARD USER’S GUIDE

Description

The Si5341-EVB is used for evaluating the Si5341 Low
Jitter Any-Frequency Clock Generator. The Si5341 uses
the patented Multisynth
10 independent clock frequencies each with 0 ppm
synthesis error. The Si5341-EVB has 3 independent
input clocks, an optional feedback input clock for zero
delay mode, and 10 independent output clocks. The
Si5341-EVB can be controlled and configured using the
Clock Builder Pro

 technology to generate up to

 (CB Pro) software tool.

EVB Features

 Powered from USB port or external power supply.
 Onboard 48 MHz XTAL allows free-run mode of

operation on the Si5341 or up to 3 input clocks for
synchronous clocking.

 Feedback clock input for optional zero delay mode.
 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 Si5341.

 SMA connectors for input and output clocks.

and all V

DD

supply allows

DD

supplies allow each

DDO

supplies.

DDO

Rev. 1.1 5/15 Copyright © 2015 by Silicon Labs Si5341-EVB

Figure 1. Si5341 Evaluation Board

Si5341-EVB

1. Functional Block Diagram

Below is a functional block diagram of the Si5341-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 “8. Installing
ClockBuilderPro (CBPro) Desktop Software” for more information.

Figure 2. Si5341-EVB Functional Block Diagram

2 Rev. 1.1

Si5341-EVB

2. Si5341-EVB Support Documentation and ClockBuilderPro Software

All Si5341 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 Si5341-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 Si5341 data sheet, go to http://www.silabs.com/timing.

to create, download, and run a frequency plan on the Si5341-EVB.

4. Jumper Defaults

Si5341 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 I

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

Refer to the Si5341 EVB schematics for the functionality associated with each jumper.

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

Rev. 1.1 3

Si5341-EVB

5. Status LEDs

Si5341EVBStatusLEDs

Location Silkscreen Color StatusFunctionIndication

D27 5VUSBMAIN Blue

D22 3P3V Blue

D26 VDD DUT Blue

D25 INTR Red

D21 READY Green

D24 BUSY Green

D27, D22, and D26 are illuminated when USB +5 V, Si5341 +3.3 V, and Si5341 VDD supply voltages, respectively,
are present. D25, D21, and D24 are status LEDs showing on-board MCU activity.

Main USB +5V present

DUT +3.3 V is present

DUT VDD voltage present

MCU INTR (Interrupt) active

MCU Ready

MCU Busy

4 Rev. 1.1

Figure 3. Status LEDs

Si5341-EVB

6. Clock Input Circuits (INx/INxB and FB_IN/FB_INB)

The Si5341-EVB has eight SMA connectors (IN0/IN0B–IN2/IN3B and FB_IN/FB_INB) for receiving external clock
signals. All input clocks are terminated as shown in Figure 4 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 Si5341 data sheet.

Figure 4. Input Clock Termination Circuit

7. 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 5 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 Si5341-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 Si5341-EVB and provide locations on the PCB for
optional DC/AC terminations by the end user.

Figure 5. Output Clock Termination Circuit

Rev. 1.1 5

Si5341-EVB

8. 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 ClockBuilderPro software.

Installation instructions and User’s Guide for ClockBuilderPro can be found at the download link shown above.
Please follow the instructions as indicated.

9. Using the Si5341 EVB

9.1. 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. EVB Connection Diagram

6 Rev. 1.1