Silicon Laboratories Si5381/82 Manual de usuario

Si5381/82 Evaluation Board User's Guide

The Si5381/82A-E-EB is used for evaluating the Ultra-Low Phase

Noise Quad/Dual PLL. The Si5381/82 employs fourth-generation

DSPLL technology to enable clock generation for LTE/ JESD204B

applications which require the highest level of jitter performance.

The Si5381/82A-E-EB has four independent input clocks and a to-

tal of 12 outputs with 4/2 PLLs. The Si5381/82A-E-EB also has

four independent input clocks and a total of 12 outputs with 2

PLLs. The Si5381/82A-E-EB can be easily controlled and config-

ured using Silicon Labs’ Clock Builder Pro™ (CBPro™) software

tool.

The device revision is distinguished by a white 1 inch x 0.187 inch label with the text

“Si5381/82A-E-EB” installed in the lower left hand corner of the board. (For ordering pur-

poses only, the terms “EB” and “EVB” refer to the board and the kit respectively. For the

purpose of this document, the terms are synonymous in context.)

EVB FEATURES

• Powered from USB port or external power

supply

• Onboard 54 MHz XO provides holdover

mode of operation on the Si5381/82

• CBPro GUI programmable VDDO supplies

allow each of the ten primary 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 Si5381/82

• SMA connectors for input clocks and

output clocks

silabs.com | Building a more connected world. Rev. 1.1

1. Si5381/82 Functional Block Diagram

Below is a functional block diagram of the Si5381/82A-E-EB. This EB can be connected to a PC via the main USB connector for pro-

gramming, control, and monitoring. See 2. Quick Start and Jumper Defaults or 6.1 Installing ClockBuilderPro (CBPro) Desktop Software

for more information.

Note: All Si5381/82 schematics, BOMs, User’s Guides, and software can be found online at the following link: http://www.silabs.com/

si538x-4x-evb

Input Clock 3

Si5381/82A

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

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

USB +5V

Connector

Ext +5V

Connector

USB Aux +5V

Connector

I2C

+5V_USB

+5V_Aux

VDDMCU

Input Clock 0 {

Input Clock 1 {

Input Clock 2 {

}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

VDDO_8

VDDO_9

VDDO_8

VDDO_9

CLKOUT_8

CLKOUT_8B

Output

Termination }Output Clock 8

CLKOUT_9

CLKOUT_9B

Output

Termination }Output Clock 9

Control/

Status

INTR

Alarm_Status

Input

Termination

CLKIN_3

CLKIN_3B

{

CLKOUT_0A

CLKOUT_0AB

Output

Termination }Output Clock 0A

CLKOUT_9A

CLKOUT_9AB

Output

Termination }Output Clock 9A

SPI

Conn

Ext Aux +5V

Connector

54 MHz

VDD_3.3V

Termination

Figure 1.1. Functional Block Diagram of Si5381/82A-E-EB

Si5381/82 Evaluation Board User's Guide

Si5381/82 Functional Block Diagram

silabs.com | Building a more connected world. Rev. 1.1 | 2

2. Quick Start and Jumper Defaults

Perform the following steps to quick-start the ClockBuilderPro software.

1. Download and install the ClockBuilderPro desktop software.

2. Connect a USB cable from the Si5381/82A-E-EB 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 verify a frequency plan on the Si5381/82A-E-EB.

5. Download the Si5381/82 data sheet for more information or go to Clock Development Tools and search for the latest Si5381/82

datasheet.

The following table lists the Si5381/82A-E-EB jumper defaults.

Table 2.1. Si5381/82A-E-EVB Jumper Defaults*

Location Type I = Installed

O = Open

Location Type I = Installed

O = Open

JP1 2 pin O JP23 2 pin O

JP2 2 pin O JP24 3 pin all open

JP3 2 pin O JP25 2 pin O

JP4 2 pin I JP26 3 pin all open

JP5 2 pin O JP27 2 pin O

JP6 2 pin O JP28 3 pin all open

JP7 2 pin I JP29 2 pin O

JP8 2 pin O JP30 3 pin all open

JP9 2 pin O JP31 2 pin O

JP13 2 pin O JP33 2 pin O

JP14 2 pin I JP34 3 pin all open

JP15 3 pin 1 to 2 JP35 2 pin O

JP16 3 pin 1 to 2 JP36 3 pin all open

JP17 2 pin O JP39 2 pin O

JP18 3 pin all open JP40 2 pin O

JP19 2 pin O JP41 2 pin O

JP20 3 pin all open JP43 2 pin I

JP21 2 pin O

JP22 3 pin all open J36 5x2 Hdr All 5 installed

Note: Refer to the Si5381/82A-E-EB schematics for the functionality associated with each jumper.

Si5381/82 Evaluation Board User's Guide

Quick Start and Jumper Defaults

silabs.com | Building a more connected world. Rev. 1.1 | 3

3. Status LEDs

Table 3.1. Si5381/82A-E-EVB Status LEDs

Location Silkscreen Color Status Function Indication

D11 INTRB Blue DUT Interrupt Active

D21 READY Green MCU Ready

D22 3P3V Blue DUT +3.3 V is present

D24 BUSY Green MCU Busy

D25 INTR Red MCU Interrupt active

D26 VDD DUT Blue DUT VDD voltage present

D27 5VUSBMAIN Blue Main USB +5 V present

D27, D22, and D26 are illuminated when USB +5 V, Si5381/82 +3.3 V, and Si5381/82 Output +5 V supply voltages, respectively, are

present. D25, D21, and D24 are status LEDs showing on-board MCU activity. D11 and D12 are status indicators from the DUT.

Figure 3.1. Status LEDs

Si5381/82 Evaluation Board User's Guide

Status LEDs

silabs.com | Building a more connected world. Rev. 1.1 | 4

4. External Reference Input (XA/XB)

An external XO is used 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 XO footprint on the Si5381/82A-E-EVB can accommodate both 3.2mm x 5 mm and 2.5 mm x 3.2 mm pack-

age sizes. The XO frequency must be 54 MHz (recommended) or 48.0231 MHz for Si5381/82A devices.

When JP43 is shorted the XO shares the VDD_3.3V DUT power supply sourced from an on-board ultra low noise LDO. When JP43 is

left open an external supply must be used to power the XO. See section 9 for Si5381/82A-E-EVB schematic details.

Note: The remaining components marked “NI” are not installed.

Figure 4.1. External Reference Input Circuit

Si5381/82 Evaluation Board User's Guide

External Reference Input (XA/XB)

silabs.com | Building a more connected world. Rev. 1.1 | 5

5. Clock Input and Output Circuits

5.1 Clock Input Circuits (INx/INxB and FB_IN/FB_INB)

The Si5381/82A-E-EB has eight SMA connectors (IN0/IN0B–IN2/IN2B and IN3(FB_IN)/IN3B(FB_INB)) for receiving external clock sig-

nals. All input clocks are terminated as shown in the figure below. Note input clocks are ac coupled and 50 Ω terminated. This repre-

sents 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 configure inputs as single-ended, refer to the Si5381/82 Data Sheet.

Figure 5.1. Input Clock Termination Circuit

5.2 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 in the figure 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 Si5381/82A-E-EB 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 Si5381/82A-E-EB, and

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

Figure 5.2. Output Clock Termination Circuit

Si5381/82 Evaluation Board User's Guide

Clock Input and Output Circuits

silabs.com | Building a more connected world. Rev. 1.1 | 6

6. Using the Si5381/82A-E-EVB and Installing ClockBuilderPro (CBPro) Desktop Software

6.1 Installing ClockBuilderPro (CBPro) Desktop Software

To install the CBPro software on any Windows 7 (or above) PC:

Go to Clock Software Development Tools and download the ClockBuilderPro software.

Installation instructions, release notes, and a user’s guide for ClockBuilderPro can be found at the download link shown above. Please

follow the instructions as indicated.

6.2 Connecting the EVB to Your Host PC

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

Figure 6.1. EVB Connection Diagram

Si5381/82 Evaluation Board User's Guide

Using the Si5381/82A-E-EVB and Installing ClockBuilderPro (CBPro) Desktop Software

silabs.com | Building a more connected world. Rev. 1.1 | 7

6.3 Additional Power Supplies

The Si5381/82A-E-EB comes preconfigured with jumpers installed on 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 +5 V power to all EVB power solely

through the J37 USB connector. This setup is the default EVB configuration and is sufficient to configure the device and run multiple

clock outputs simultaneously.

In some cases when enabling all outputs or at high output frequencies, the EVB requires more power than a single USB connection can

provide. This may result in intermittent device behavior or undesired increases in jitter/phase-noise. This condition may be checked us-

ing the EVB GUI, which is described further below. Selecting the “All Voltages” tab of the GUI and clicking on the “Read All” button

produces a display similar to this one:

Figure 6.2. EVB GUI - Power Supply Check

Verify that the “RAIL_5V” measurement shows the EVB voltage > 4.5 V. An EVB voltage lower than this level may cause the issues

described above.

In this case, J33 can be used to provide power to the output drivers separately from the main Si5381/82 device supplies. To make this

change, move jumper JP15 to connect pins 2-3 “EXT”. Connect J33 to an external 5 V, 0.5 A or higher power source. Make sure that

the polarity of the +5 V and GND connections are correct. Verify that the RAIL_5V voltage is 4.7 V or higher. The EVB should be pow-

ered by the USB connector when turning this auxiliary 5 V supply on or off.

See the figure below for the correct installation of the jumper shunts at JP15 and JP16 for default or standard operation.

Figure 6.3. JP15-JP16 Standard Jumper Shunt Installation

Si5381/82 Evaluation Board User's Guide

Using the Si5381/82A-E-EVB and Installing ClockBuilderPro (CBPro) Desktop Software

silabs.com | Building a more connected world. Rev. 1.1 | 8

6.4 Overview of ClockBuilderPro Applications

Note: The following instructions and screen captures may vary slightly depending on your version of ClockBuilder Pro.

The ClockBuilderPro installer will install two main applications.

Application 1:

Figure 6.4. ClockBuilderPro Wizard

Use the CBPro Wizard to do the following:

• Create a new design.

• Review or edit an existing design.

• Export: Create in-system programming files.

Si5381/82 Evaluation Board User's Guide

Using the Si5381/82A-E-EVB and Installing ClockBuilderPro (CBPro) Desktop Software

silabs.com | Building a more connected world. Rev. 1.1 | 9

Application 2:

Figure 6.5. EVB GUI

Use the EVB GUI to do the following:

• Download configuration to EVB’s DUT (Si5381/82).

• Control the EVB’s regulators.

• Monitor voltage, current, power on the EVB.

6.5 Common ClockBuilderPro Work Flow Scenarios

There are three common workflow scenarios when using CBPro and the Si5381/82A-E-EB. These workflow scenarios are:

•Workflow Scenario #1: Testing a Silicon Labs-created Default Configuration

•Workflow Scenario #2: Modifying the Default Silicon Labs-created Device Configuration

•Workflow Scenario #3: Testing a User-created Device Configuration

Each is described in more detail in the following sections.

Si5381/82 Evaluation Board User's Guide

Using the Si5381/82A-E-EVB and Installing ClockBuilderPro (CBPro) Desktop Software

silabs.com | Building a more connected world. Rev. 1.1 | 10

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