Silicon Laboratories Si5340-EVB User Manual

Si5340-EVB

Si5340 EVALUATION BOARD USER’S G UIDE

Description

The Si5340-EVB is used for evaluating the Si5340 Low
Jitter Any-Frequency Clock Generator. The Si5340 uses
the patented MultisynthTM technology to generate up to
10 independent clock frequencies each with 0 ppm
synthesis error. The Si5340-EVB has 3 independent
input clocks, an optional feedback input clock for zero
delay mode, and 4 independent output clocks. The
Si5340-EVB can be controlled and configured using the
Clock Builder Pro

Si5340 Evaluation Board

TM

(CB ProTM) software tool.

Features

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

operation on the Si5340 or up to 3 input clocks for
synchronous clocking

 Feedback clock input for optional zero delay mode

 CBPro

device to operate from 3.3, 2.5, or 1.8 V.

 CBPro GUI-programmable VDDO supplies allow

each of the 4 outputs to have its own 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 Si5340

 SMA connectors for input and output clocks

TM

GUI-programmable VDD supply allows

Rev. 1.0 Copyright © 2015 by Silicon Laboratories Si5340-EVB

Si5340-EVB

1. Functional Block Diagram

Below is a functional block diagram of the Si5340-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
ClockBuilderPro (CBPro) Desktop Software” for more information.

Figure 1. Si5340-EVB Block Diagram

2 Rev. 1.0

Si5340-EVB

2. Si5340 EVB Support Documentation and ClockBuilderProTM Software

All Si5340 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 Si5340-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 Si5340-EVB.

5. For Si5340 data sheet go to: 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 all open

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

JP13 2 pin O JP17 5x2 Hdr All 5 installed

Location Type I = Installed

0 = Open

Note: Refer to the Si5340 EVB schematics for the functionality associated with each jumper.

Rev. 1.0 3

Si5340-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

Si5340-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
Si5340-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 below). 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 Si5340-EVB has eight SMA connectors (IN0/IN0B – IN2/IN2B and FB_IN/FB_INB) for receiving external clock
signals. All input clocks are terminated as shown in Figure 4 below.

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 Si5340 data sheet.

Figure 4. Input Clock Termination Circuit

Rev. 1.0 5

Si5340-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 below. 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 Si5340-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 Si5340-EVB and provide locations on

the PCB for optional DC/AC terminations by the end user.

Figure 5. Output Clock Termination Circuit

9. Installing ClockBuilderPro (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 the Si5340 EVB

10.1. Connecting the EVB to Your Host PC

Once the ClockBuilderPro™ software in installed, connect the PC to the EVB with a USB cable as illustrated in
Figure 6.

6 Rev. 1.0

Figure 6. EVB Connection Diagram