Silicon Laboratories Si5347-EVB Manuale utente

Si5347-EVB

Si5347 EVALUATION BOARD USER’SGUIDE

Description

The Si5347-EVB is used for evaluating the Si5347

Quad Any-Frequency Jitter Attenuating Clock Multiplier.

The Si5347 contains 4 independent DSPLLs in a single

IC with programmable jitter attenuation bandwidth on a

per DSPLL basis. The Si5347-EVB supports 4

independent input clocks and 8 independent output

clocks via on-board SMA connectors. The Si5347-EVB

can be controlled and configured via a USB connection

to a host PC running Silicon Labs’ next generation

Clock Builder Pro(CBPro) software tool. Test points

are provided on-board for external monitoring of supply

voltages.

EVB Features

Powered from USB port or external +5 V power

supply via screw terminals.

Onboard 48 MHz XTAL allows standalone or

holdover mode of operation on the Si5347.

CBProGUI programmable VDD supply allows

device supply voltages of 3.3, 2.5, or 1.8 V.

CBPro GUI programmable VDDO supplies allow each

of the 8 outputs to have its own supply voltage

selectable from 3.3, 2.5, or 1.8 V.

CBPro GUI allows control and measurement of

voltage, current, and power of VDD and all 8 VDDO

supplies.

Status LEDs for power supplies and control/status

signals of Si5347.

SMA connectors for input clocks, output clocks and

optional external timing reference clock.

Figure 1. Si5347 Evaluation Board

Si5347-EVB

2 Rev. 1.1

1. Si5347-EVB Functional Block Diagram

Below is a functional block diagram of the Si5347-EVB. This EVB can be connected to a PC via the main USB

connector for programming, control, and monitoring. See section “3. Quick Start” for more information.

Figure 2. Si5347-EVB Functional Block Diagram

Si5347

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

Input

Termination

Input

Termination

Input

Termination

Input

Termination

CLKIN_0

CLKIN_0B

CLKIN_1

CLKIN_1B

CLKIN_2

CLKIN_2B

CLKIN_3

CLKIN_3B

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

FINC

OE_0

DSPLL_SEL0

DSPLL_SEL1

FDEC

I2C/SPI Bus

Alarm_Status

INTR

+5V_USB

+5V_Aux

+5V_Ext

VDDMCU

Input Clock 0 {

Input Clock 1 {

Input Clock 2 {

Input Clock 3 {

}Output Clock 0

}Output Clock 1

}Output Clock 2

}Output Clock 3

}Output Clock 4

}Output Clock 5

}Output Clock 6

}Output Clock 7

Power only

XAXB

Crystal / Term

Optional External

XAXB Ref Input {

Si5347-EVB

Rev. 1.1 3

2. Si5347-EVB Support Documentation and ClockBuilderProSoftware

All Si5347 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 EVB support web page given in Section 2.

2. Connect USB cable from Si5347-EVB to PC with ClockBuilderPro software 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 Si5347-EVB.

5. For the Si5347 data sheet, go to http://www.silabs.com/timing.

4. Jumper Defaults

Refer to the Si5347-EVB schematics for the functionality associated with each jumper.

Table 1. Si5347 EVB Jumper Defaults

Location Type I = Installed

0 = Open Location Type I = Installed

0 = Open

JP1 2 pin I JP23 2 pin O

JP2 2 pin O JP24 2 pin O

JP3 2 pin I JP25 2 pin O

JP4 2 pin I JP26 2 pin O

JP5 2 pin O JP27 2 pin O

JP6 2 pin O 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 all open 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 I

JP20 2 pin O JP41 2 pin I

JP21 2 pin O

JP22 2 pin O J36 5x2 Hdr All 5 installed

Si5347-EVB

4 Rev. 1.1

5. Status LEDs

D27, D22, and D26 are illuminated when USB +5 V, Si5347 +3.3 V, and Si5347 Vcore supply voltages,

respectively, are present. D25, D21, and D24 are status LEDs showing on-board MCU activity. D2 indicates loss of

signal at XAXB input (either crystal osc or external reference). D5, D6, D8, D12 indicate loss of lock for one of 4

internal DSPLLs (A–D). D11 indicates Si5347 interrupt output is active (as configured by Si5347 register

programming). LED locations are highlighted below with LED function name indicated on board silkscreen.

Table 2. Si5347-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 Core voltage present

D25 INTR Red MCU INTR (Interrupt) active

D21 READY Green MCU Ready

D24 BUSY Green MCU Busy

D2 LOS_XAX-

B_B

Blue Loss of Signal at XAXB input

D5 LOL_AB Blue Loss of Lock - DSPLL A

D6 LOL_BB Blue Loss of Lock - DSPLL B

D8 LOL_CB Blue Loss of Lock _ DSPLL C

D11 INTRB Blue Si5347 Interrupt Active

D12 LOL_DB Blue Loss of Lock _ DSPLL D

Si5347-EVB

Rev. 1.1 5

Figure 3. Si5347-EVB LED Locations

Si5347-EVB

6 Rev. 1.1

6. External Reference Input (XA/XB)

An external timing reference (48 MHz 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 Si5347-EVB can also accommodate an external reference clock instead of a crystal. To evaluate the

device with an external REFCLK, C111 and C113 must be populated and XTAL Y1 removed (see Figure 4 below).

The REFCLK can then be applied to SMA connectors J39 and J40.

Figure 4. External Reference Input Circuit

Si5347-EVB

Rev. 1.1 7

7. Clock Input Circuits (INx/INxB)

The Si5347-EVB has eight SMA connectors (IN0-IN0B—IN3./IN3B) for receiving external clock signals. All input

clocks are terminated as show in Figure 5 below. Note 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 Si5347 data sheet.

Figure 5. Input Clock Termination Circuit

8. Clock Output Circuits (OUTx/OUTxB)

Each of the sixteen output drivers (8 differential pairs, OUT0/OUT0B—OUT7/OUT7B) 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 Si5347-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 Si5347-EVB and provide

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

Figure 6. Output Clock Termination Circuit

Si5347-EVB

8 Rev. 1.1

9. Installing ClockBuilderPro(CBPro) Desktop Software

To install the CBPro 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 ClockBuilder can be found at the download link shown above. Please

follow the instructions as indicated.

10. Using the Si5347 EVB

10.1. Connecting the EVB to Your Host PC

Once ClockBuilderPro software is installed, connect to the EVB with a USB cable as shown below.

Figure 7. EVB Connection Diagram

Si5347-EVB

Rev. 1.1 9

10.2. Additional Power Supplies

The Si5347-EB comes pre-configured with jumpers installed at JP15 and JP16 (pins 1-2 in both cases) in order to

select “USB”. These jumpers, together with the components installed, configure the evaluation board to obtain all

+5 V power solely through the main USB connector at J37. This setup is the default configuration and should

normally be sufficient.

Figure 8 shows the correct installation of the jumper shunts at JP15 and JP16 for default or standard operation.

Figure 8. JP15-JP16 Standard Jumper Shunt Installation

Errata Note:Some early versions of the 64-pin Si534x-EVBs may have the silkscreen text at JP15-JP16 reversed regarding

EXT and USB, i.e., USB EXT instead of EXT USB. Regardless, the correct installation of the jumper shunts for

default or standard operation is on the right hand side as read and viewed in Figure 8.

The general guidelines for single USB power supply operation are listed below:

Use either a USB 3.0 or USB 2.0 port. These ports are specified to supply 900 mA and 500 mA

respectively at +5 V.

If you are working with a USB 2.0 port and you are current limited, turn off enough DUT output voltage

regulators to drop the total DUT current ≤470 mA. (Note: USB 2.0 ports may supply > 500 mA. Provided

the nominal +5 V drops gracefully by less than 10%, the EVB will still work.)

If you are working with a USB 2.0 and you are current limited and need all output clock drivers enabled,

re-configure the EVB to drive the DUT output voltage regulators from an external +5 V power supply as

follows:

Connect external +5 V power supply to terminal block J33 on the back side of the PCB.

Move the jumper at JP15 from pins 1-2 USB to pins 2-3 EXT.

Si5347-EVB

10 Rev. 1.1

10.3. Overview of ClockBuilderPro Applications

The ClockBuilderPro installer will install two main applications:

Figure 9. Application #1: ClockbuilderPro Wizard

Use the CBPro Wizard to:

Create a new design

Review or edit an existing design

Export: create in-system programming files

Figure 10. Application #2: EVB GUI

Use the EVB GUI to:

Download configuration to EVB’s DUT (Si5347)

Control the EVB’s regulators

Monitor voltage, current, power on the EVB

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