Silicon Laboratories Si5395 Manuel utilisateur

UG335: Si5395 Evaluation Board User's

Guide

The Si5395 EVB is used for evaluating the Si5395 Any-Frequency, Any-Output, Jitter-

Attenuating Clock Multiplier. There are two different EVBs for the Si5395. There is a

Grade A and a Grade P board. This user guide is intended for both versions of the

Si5395 EVBS. The device grade and revision is distinguished by a white 1 inch x 0.187

inch label installed in the lower left hand corner of the board. In the example below, the

label "SI5395A-A-EB" indicates the evaluation board has been assembled with an

Si5395 device, Grade A, Revision A, installed. (For ordering purposes only, the terms

“EB” and “EVB” refer to the board and the kit, respectively. For the purpose of this docu-

ment, the terms are synonymous in context.)

KEY FEATURES

• Powered from USB port or external power

supply

• Onboard 48 MHz XTAL or Reference SMA

Inputs allow holdover mode of operation on

the Si5395

• CBPro™ GUI programmable VDD supply

allows device to operate from 3.3, 2.5, or

1.8 V

• CBPro GUI programmable VDDO supplies

allow each 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 VDD and all

VDDO supplies

• Status LEDs for power supplies and

control/status signals of Si5395

• SMA connectors for input clocks, output

clocks, and optional external timing

reference clock

silabs.com | Building a more connected world. Rev. 0.96

1. Functional Block Diagram

Below is a functional block diagram of the Si5395 EVB. This evaluation board can be connected to a PC via the main USB connector

for programming, control, and monitoring. See 3. Quick Start or 10.3 Overview of ClockBuilderPro Applications for more information.

Si5395

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

CLKOUT_6

CLKOUT_6B

Output

Termination

CLKOUT_7

CLKOUT_7B

Output

Termination

48 MHz

XTAL

Input

Termination

Input

Termination

Input

Termination

CLKIN_0

CLKIN_0B

CLKIN_1

CLKIN_1B

CLKIN_2

CLKIN_2B

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_6

VDDO_7

VDDO_0

VDD_Core

VDD_3.3

VDDO_1

VDDO_2

VDDO_3

VDDO_4

VDDO_5

VDDO_6

VDDO_7

Main USB

Connector

Aux USB

Connector

Ext +5V

Connector

I2C/SPI Bus

+5V_USB

+5V_Aux

+5V_Ext

VDDMCU

Input Clock 0 {

Input Clock 1 {

Input Clock 2 {

}Output Clock 0A

}Output Clock 0

}Output Clock 1

}Output Clock 2

}Output Clock 3

}Output Clock 4

}Output Clock 5

}Output Clock 6

Power only

VDDO_8

VDDO_9

VDDO_8

VDDO_9

CLKOUT_8

CLKOUT_8B

Output

Termination }Output Clock 7

CLKOUT_9

CLKOUT_9B

Output

Termination }Output Clock 8

Control/

Status

INTR

Alarm_Status

Input

Termination

CLKIN_3/FB_IN

CLKIN_3/FB_INB

Input Clock 3 {

CLKOUT_9A

CLKOUT_9AB

Output

Termination }Output Clock 9A

Output

Termination }Output Clock 9

CLKOUT_0A

CLKOUT_0AB

VDDO_9A VDDO_9A

VDDO_0A VDDO_0A

Figure 1.1. Si5395 EB Functional Block Diagram

UG335: Si5395 Evaluation Board User's Guide

Functional Block Diagram

silabs.com | Building a more connected world. Rev. 0.96 | 2

2. Si5395 EVB Support Documentation and ClockBuilderPro™ Software

All Si5395 EVB schematics, BOMs, User’s Guides, and software can be found online at: http://www.silabs.com/products/clocksoscilla-

tors/pages/si539x-evb.aspx.

UG335: Si5395 Evaluation Board User's Guide

Si5395 EVB Support Documentation and ClockBuilderPro™ Software

silabs.com | Building a more connected world. Rev. 0.96 | 3

3. Quick Start

1. Install the ClockBuilderPro desktop software from http://www.silabs.com/CBPro.

2. Connect a USB cable from Si5395 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 to create, download, and run a frequency plan on the Si5395 EVB.

5. For the Si5395 data sheet, go to http://www.silabs.com/timing.

UG335: Si5395 Evaluation Board User's Guide

Quick Start

silabs.com | Building a more connected world. Rev. 0.96 | 4

4. Jumper Defaults

Table 4.1. Si5395 EVB Jumper Defaults1

Location Type I= Installed

0 = Open Location Type I = Installed

0 = Open

JP1 2-pin O JP23 2-pin O

JP2 2-pin I JP24 2-pin O

JP3 2-pin O JP25 2-pin O

JP4 2-pin I JP26 2-pin O

JP5 2-pin I JP27 2-pin O

JP6 2-pin I 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 J36 5 x 2 Hdr All 5 installed

JP22 2-pin O

Note:

1. Refer to the Si5395 EVB schematics for the functionality associated with each jumper.

UG335: Si5395 Evaluation Board User's Guide

Jumper Defaults

silabs.com | Building a more connected world. Rev. 0.96 | 5

5. 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, Si5395 +3.3 V, and Si5395 VDD supply voltages, respectively, are present. D25,

D21, and D24 are status LEDs showing on-board MCU activity.

Figure 5.1. Status LEDs

UG335: Si5395 Evaluation Board User's Guide

Status LEDs

silabs.com | Building a more connected world. Rev. 0.96 | 6

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 to provide a stable reference for the free-run and holdover modes. The Si5395 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 the figure below). Also, R197 and R202 must be populated. The REFCLK can then be supplied to J39 and J40. In the case of the

Si5395J-A, which is the grade with the xtal internal to the device, there will be no external xtal supplied on the board and no input from

Ref_XA and Ref_XB. In this case, it is advised to remove R197 and R202.

Figure 6.1. External Reference Input Circuit

UG335: Si5395 Evaluation Board User's Guide

External Reference Input (XA/XB)

silabs.com | Building a more connected world. Rev. 0.96 | 7

7. Clock Input Circuits (INx/INxB)

The Si5395 EVB has eight SMA connectors (IN0, IN0B – IN3, IN3B) for receiving external clock signals. All input clocks are terminated

as shown below. 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 con-

figure inputs as single-ended, refer to the Si5395 data sheet.

Figure 7.1. Input Clock Termination Circuit

UG335: Si5395 Evaluation Board User's Guide

Clock Input Circuits (INx/INxB)

silabs.com | Building a more connected world. Rev. 0.96 | 8

8. Clock Output Circuits (OUTx/OUTxB)

Each of the twenty-four output drivers (12 differential pairs) is ac-coupled to its respective SMA connector. The output clock termination

circuit is shown 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 Si5395 EVB provides pads for optional output termination resistors and/or low-frequency capacitors.

Note that components with the schematic “NI” designation are not normally populated on the Si5395 EVB and provide locations on the

PCB for optional dc/ac terminations by the end user.

Figure 8.1. Output Clock Termination Circuit

UG335: Si5395 Evaluation Board User's Guide

Clock Output Circuits (OUTx/OUTxB)

silabs.com | Building a more connected world. Rev. 0.96 | 9

9. 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 the ClockBuilder-

Pro software.

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

UG335: Si5395 Evaluation Board User's Guide

Installing ClockBuilderPro (CBPro) Desktop Software

silabs.com | Building a more connected world. Rev. 0.96 | 10

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