Si5328-EVB User`s Guide

Si 5 3 2 8 - EVB
Si5328-EVB FOR S Y N C E
1. Introduction
The Si5328-EVB provides a platform for evaluating Silicon Laboratories' Si5328 Any-Frequency Precision Clock
Timing IC. The Si5328 is controlled by a microprocessor or MCU (micro-controller unit) via an I2C or SPI interface.
The Si5328 is a jitter attenuator with a loop bandwidth ranging from 0.05 to 6 Hz. When combined with a
low-wander, low-jitter reference oscillator, the Si5328 meets all of the wander, MTIE, TDEV, and other
requirements listed in ITU-T G.8262/Y.1362 and commonly referred to as “SyncE” or “Synchronous Ethernet”.
Top (U11 TCXO Plastic Cover Removed)
Bottom
Figure 1. Si5328-EVB
2. Applications
The Si5328 Any-Frequency Precision Clock has a comprehensive feature set for SyncE applications, including
any-frequency synthesis, multiple clock inputs, multiple clock outputs, a programmable loop bandwidth supporting
G.8262 options EEC1 and EEC2, alarm and status outputs, hitless switching between input clocks, programmable
output clock signal format (LVPECL, LVDS, CML, CMOS), and output phase adjustment between output clocks.
For more details, consult the Silicon Laboratories timing products web site at www.silabs.com/timing.
The evaluation board (EVBs) has an MCU (C8051F340) that supports USB communications with a PC host. The
Si5328 is controlled and monitored through the serial port (either SPI or I2C). A CPLD sits between the MCU and
the Any-Frequency Precision Clock device that performs voltage-level translation. Ribbon headers and SMA
connectors are included so that external clock in, clock out, and status pins can be easily accessed by the user.
The user also has the option of bypassing the MCU and controlling the parts from an external serial device.
Onboard termination is included so that the user can evaluate single-ended or differential as well as ac or dc
coupled clock inputs and outputs. A separate and optional DUT (Device Under Test) power supply connector is
included so that the Any-Frequency Precision Clocks can be run at either 1.8, 2.5 or 3.3 V, while the USB MCU
remains at 3.3 V powered by the USB connector. LEDs are provided for convenient monitoring of key status
signals.
Rev. 0.1 7/13
Copyright © 2013 by Silicon Laboratories
Si5328-EVB
Si5328-EVB
3. Features
The Si5328-EVB includes the following:
USB
cable
EVB circuit board including an Si5328 and a TCXO reference oscillator.
4. Si5316-EVB, Si5319-EVB, Si5322/23-EVB, Si5324-EVB, Si5325/26-EVB,
Si5327-EVB, and Si5328-EVB Quick Start
1. Download and install the DSPLLsim software package from out web site at:
http://www.silabs.com/products/clocksoscillators/Pages/Si5328-EVB.aspx
2. Connect a USB cable from the EVB to the PC where the software was installed.
3. Install USB driver.
4. Launch software by clicking on StartProgramsSilicon LaboratoriesPrecision Clock EVB Software
and selecting one of the programs.
5. Functional Description
The Si5328-EVB software allows for a complete and simple evaluation of the functions, features, and performance
of the Si5328 Any-Frequency Precision Clocks.
5.1. Block Diagram
Figure 2 is a block diagram of the evaluation board. The MCU communicates to the host PC over a USB
connection. The MCU controls and monitors the Si532x through the CPLD. The CPLD, among other tasks,
translates the signals at the MCU voltage level of 3.3 V to the Si532x's voltage level, which is nominally 3.3, 2.5, or
1.8 V. The user has access to all of the Si532x's pins using the various jumper settings as well as through the host
PC via the MCU and CPLD.
Figure 2. Si5328-EVB Block Diagram
2
Rev. 0.1
Si5328-EVB
5.2. Si5328 Input and Output Clocks
The Si5328 has two differential inputs that are ac terminated to 50  and then ac coupled to the part. Single-ended
operation can be implemented by simply not connecting to one of the two of the differential pairs bypassing the
unused input to ground with a capacitor. When operating with clock inputs of 1 MHz or less in frequency, the
appropriate dc blocking capacitors (C39, C41, C34, and C36) located on the bottom of the board should be
replaced with 0  resistors. It may also be necessary to remove the 50  ac termination to ground and use source
series termination located at the driver. If this approach is used, the onboard ac termination should be removed
(e.g. R46 or C40). The reason for this is that the capacitive reactance of the ac coupling capacitors becomes
significant at low frequencies. It is also important that the CKIN signal meet the minimum rise time of 11 ns (CKNtrf)
even though the input frequency is low.
Two jumpers are provided to assist in monitoring the Si5328 power: When R27 is removed, J20 can be used to
measure the device current. J20 can be used at any time to monitor the supply voltage at the device.
The Si5328 requires an external TCXO/OCXO reference so that it can operate as an ultra-narrowband jitter
attenuator with a loop bandwidth as low as 0.05. The range of acceptable reference frequencies is described in the
Any-Frequency Precision Clocks Family Reference Manual (Si53xxRM.pdf). The EVB is shipped with a Rakon
TCXO that was used for the G.8262 compliance tests.
The Si5328-EVB can be used with the on-board TCXO or an external reference oscillator. If the on-board TCXO
is in use, its Vdd can be either 3.3 V or the DUT Vdd, with the default connection being to Vdd.
If an external reference oscillator is in use, it can be either single-ended or differential. To use an external oscillator,
make the following changes:
1. Remove R64 so that the TCXO power is removed
2. Remove R62 to isolate the output of the TCXO
3. Install R61 to establish a connection to J2
4. Change R9 to a 50  resistor for proper termination
For single-ended operation, connect the reference signal to J2 and leave J1 open.
5.3. External Control and Status Headers
J17 is a ten pin ribbon header that is provided so that an external processor can control the Si5328 over either the
SPI or I2C bus. J17 can also be used to control an external Si5328 with the onboard MCU.
J14 is another ten pin ribbon header that brings out all of the status outputs from the Si5328. Note that some pins
are shared and serve as both inputs and outputs, depending on how the device is configured. For users who wish
to remotely access the input and output pin settings as well as serial ports with external hardware, both of these
headers can be connected to ribbon cables.
5.4. CPLD and Power
This CPLD is required for the MCU to control the Si5328. The CPLD provides two main functions: it translates the
voltage level from 3.3 V (the MCU voltage) to the Si5328 voltage (either 1.8, 2.5, or 3.3 V). The MCU
communicates to the CPLD with the SPI signals SS_CPLD_B (slave select), MISO (master in, slave out), MOSI
(master out, slave in), and SCLK. The MCU can talk to CPLD-resident registers that are connected to pins that
control the Si5328's pins, mainly for pin control mode. When the MCU wishes to access an Si5328 register, the SPI
signals are passed through the CPLD, while being level translated, to the Si5328. The CPLD is an EE device that
retains its code and is loaded through the JTAG port (J27). The core of the CPLD runs at 1.8 V, which is provided
by voltage regulator U6. The CPLD also logically connects many of the LEDs to the appropriate Si5328 pins.
Rev. 0.1
3
Si5328-EVB
DUT_PWR
+3.3 V
MCU
SS_CPLD_B
SS_B
SCLK
SCLK
MOSI
CPLD
MISO
SDI
Si5328
SDO
Figure 3. SPI Mode Serial Data Flow
This EVB can be powered solely by the USB port if the Si5328 and the TCXO are both operating at 3.3 V. The
factory default powers the entire board with 3.3 V from the USB connection. If a different Si5328 voltage is desired,
the jumper at J19 can be moved so that it is between pins J13.1 and J13.2. Si5328 power is then supplied at J30.
There are eight LEDs, as described in Table 1.
The Evaluation board has a serial port connector (J17) that supports the following:
Control
by the MCU/CPLD of an Any-Frequency part on an external target board.
of the Si5328 that is on the Eval board through an external SPI or I2C port.
For details, see J17 (Table 4).
Control
Though they are not needed on this Evaluation Board because the CPLD has low output leakage current, some
applications will require the use of external pullup and pulldown resistors when three level pins are being driven by
external logic drivers.
5.5. MCU
The MCU is responsible for connecting the evaluation board to the PC so that PC resident software can be used to
control and monitor the Si5328. The USB connector is J3 and the debug port, by which the MCU is flashed, is J24.
The reset switch, SW1, resets the MCU, but not the CPLD. The MCU is a self-contained USB master and runs all
of the code required to control and monitor the Si5328.
U4 contains a unique serial number for each board and U3 is an EEPROM that is used to store configuration
information for the board. The board powers up in free run mode with a configuration that is outlined in "Appendix—
Powerup and Factory Default Settings" on page 15.
U3 configures the EVB for a specific frequency plan as described in "Appendix—Powerup and Factory Default
Settings" on page 15.
LVPECL outputs will not function at 1.8 V. If the Si532x part is to be operate at 1.8 V, the output format
needs to be changed by altering the SFOUT register bits.
4
Rev. 0.1
Si5328-EVB
6. Connectors and LEDs
6.1. LEDs
There are eight LEDs on the board which provide a quick and convenient means of determining board status.
Table 1. LED Status and Description
LED
Color
Label
D1
Green
3.3 V
D2
Green
DUT_PWR
D5
Red
LOL
D4
Red
C1B
D6
Red
C2B
D3
Green
CA
D7
Yellow
CPLD
D8
Yellow
MCU
Rev. 0.1
5
Si5328-EVB
6.2. User Jumpers and Headers
Use the following to locate the jumpers described in Figure 4:
J1, J2
Ext
XAXB
TCXO
J14,
status
Si5328
J17,
Serial
port
J19,
DUT
Power
J19,
DUT
Power
jumper
Figure 4. Connectors, Jumper Header Locations
The Si5328-EVB derives power from its USB connector for the MCU, CPLD, LEDs, etc. When the DUT is to be
driven with a Vdd of 3.3 V, USB power can also be used to power the entire evaluation board. For instances when
A Vdd of 2.5 V or 1.8 V is desired, the jumper plug at J19 labeled DUT_PWR should be moved from the USB
position to the EXT position. DUT power should be applied at J30, which is the green power connector located on
the bottom of the board. It is possible to run the TCXO from either 3.3 V or from DUT_PWR by installing a three-pin
jumper header at J31 and removing R64. To measure the DUT current, remove R27 and install an ammeter
between the pins of J20.
6
Rev. 0.1
Si5328-EVB
The Si5328-EVB is configured with an on-board TCXO that is suitable for G.8262 applications and has a clipped
sine wave output. For purposes of evaluation, a different TCXO/OCXO can be installed on the board. A TXCO with
a CMOS output can be used as well as an external XAXB reference oscillator. Table 2 lists the components that
need to changed to accommodate these options:
Table 2. Status Header, J14
Component
R9
R61
R62
CMOS Output
493 
nopop
493 
Clipped Sine Wave
nopop
nopop
50 
External TCXO
50 
0
nopop
Silkscreen arrows point to these components to assist in identifying them. They are located on the bottom of the
board. J14 is a 10-pin ribbon header that provides an external path to monitor the status pins.
Table 3. Status Header, J14
J14
J14.1
J14.3
J14.5
J14.7
J14.9
Pin
LOL
C1B
C2B
CS_CA
DUT_PWR
Comment
clock active
J17 is a 10 pin ribbon header that provides an external path to serially communicate with the Any-Frequency
Precision Clock.
To control the Si5328 that is on the Evaluation Board from an external serial port, open the Register Programmer,
connect to the Evaluation Board, go to Options in the top toolbar, and select “Switch To External Control Mode”.
To control an Si5328 that is on an external target board from the Evaluation Board using its serial port, tie pin 9 of
J17 low so that the on-board Si5328 is constantly being held in reset. This will force it to disable its SDA_SDO
output buffer.
Table 4. External Serial Port Connector, J17
J17
J17.1
J17.3
J17.5
J17.7
J17.9
Pin
SDA_SDO
SCL_SCLK
SDI
A2_SS
DUT_RST_B
Comment
not reset
J1 and J2 are edge mount SMA connectors that are used, if so configured, to supply an external single-ended or
differential reference oscillator.
Rev. 0.1
7
Si5328-EVB
7. EVB Software Installation
The release notes and the procedure for installing the EVB software can be downloaded from the Silabs web site:
www.silabs.com/timing. Follow the links for 1-PLL Jitter attenuators, and look under the Tools tab.
7.1. Precision Clock EVB Software Description
There are several programs to control the Precision Clock device. Each provides a different kind of access to the
device. Refer to the online help in each program by clicking HelpHelp in the menu for more information on how
to use the software. Note: Some of the Precision Clock devices do not have a register map, so some programs
may not be applicable to them.
Table 5. User Applications
Program
Description
Register Viewer
The Register Viewer displays the current register map data in a table format sorted by register address to provide an overview of the device’s state. This program can save and print
the register map.
Register Programmer The Register Programmer provides low-level register control of the device. Single and
batch operations are provided to read from and write to the device. Register map files can
be saved and opened in the batch mode.
Setting Utility
DSPLLsim
8
This application allows for quick access to each control on the Precision Clock device
(either pin- or register-based). It can save and open text files as well.
The DSPLLsim provides high-level control of the Precision Clock device. It has the frequency planning wizard as well as control of the pins and registers in a organized, intuitive
manner.
Rev. 0.1
Si5328-EVB
Figure 5. Si5328
8. Schematics
Rev. 0.1
9
Figure 6. CPLD and Power
Si5328-EVB
10
Rev. 0.1
Figure 7. MCU
Si5328-EVB
Rev. 0.1
11
Si5328-EVB
9. Bill of Materials
Table 6. Si5328 Bill of Materials
12
Item
Qty
Reference
Part
Mfgr
MfgrPartNum
1
21
C1,C2,C3,C6,C7,C8,C9,
C12,C19,C20,C22,C27,C29,
C32,C33,C34,C36,C39,C41,
C46,C48
100 nF
Venkel
C0603X7R160-104KNE
2
14
C4,C5,C13,C14,C16,C18,
C30,C31,C35,C37,C40,C42,
C43,C44
10 nF
Venkel
C0603X7R160-103KNE
3
9
C10,C11,C15,C21,C28,C38,
C45,C47,C49
1 µF
Venkel
C0603X7R6R3-105KNE
4
4
C17,C24,C26,C50
33 µF
Venkel
TA0006TCM336MBR
5
1
C23
220 µF
Kemet
T494B227M004AT
6
3
D1,D2,D3
Grn
Panasonic
LN1371G
7
3
D4,D5,D6
Red
Panasonic
LN1271RAL
8
2
D7,D8
Yel
Panasonic
LN1471YTR
9
4
H1,H2,H3,H4
#4
10
10
J1,J2,J6,J8,J16,J18,J23,
J25,J28,J29
SMA_EDGE
Johnson
142-0701-801
11
1
J3
USB
FCI
61729-0010BLF
12
9
J4,J5,J7,J10,J11,J13,J15,
J21,J22
Jmpr_1pin
13
3
J14,J17,J24
10_M_Header_SMT
Samtec
HTST-105-01-lm-dv-a
14
1
J19
Jmpr_3pin
16
1
J27
SMT
Sullins
GZC36SABN-M30
17
1
J30
Phoenix_2_screw
Phoenix
MKDSN 1.5/2-5.08
19
3
L2,L3,L4
Ferrite
Venkel
FBC1206-471H
20
1
Q1
BSS138
On Semi
BSS138LT1G
21
5
R1,R10,R30,R33,R58
1 k
Venkel
CR0603-16W-1001FT
22
2
R2,R3
27.4 
Venkel
CR0603-16W-27R4FT
24
6
R5,R6,R7,R23,R24,R55
10 k
Venkel
CR603-16W-1002FT
27
11
R11,R12,R13,R14,R22,R36,
R43,R45,R46,R48,R62
49.9 k
Venkel
CR0603-16W-49R9FT
Rev. 0.1
Si5328-EVB
Table 6. Si5328 Bill of Materials
Item
Qty
Reference
Part
Mfgr
MfgrPartNum
28
5
R17,R31,R32,R53,R57
10 
Venkel
CR0603-16W-10R0FT
29
6
R20,R27,R29,R51,R56,R64
0
Venkel
CR0603-16W-000T
30
1
R21
66.5 
Venkel
CR0603-16W-66R5FT
31
2
R25,R26
R150x4
Panasonic
EXB-38V151JV
32
2
R41,R54
R82x4
Panasonic
EXB-38V820JV
33
1
R52
113
Venkel
CR0603-16W-1130FT
35
1
SW1
NO
Mountain
Switch
101-0161-EV
36
2
U1,U2
SN65220
TI
SN65220DBVT
37
1
U3
M95040
ST Micro
M95040-WMN6P
38
1
U4
DS2411
Maxim/Dallas
DS2411P
39
1
U5
Si5328
Silicon Labs
Si5328C-C-GQ
40
1
U6
TPS76201
TI
TPS76201DBVT
41
1
U7
Si8051F340
Silicon Labs
C8051F340-GQ
42
1
U8
XC2C128
Xilinx
XC2C128-7VQG100I
43
1
U9
74LCX541
Fairchild
74LCX541MTC_NL
44
1
U10
LM1117
National
LM1117MPX-3.3
45
1
U11
TCXO, 40 MHz
Rakon
TTX7050A, 509768
46
1
TCXO cover
Rakon
PCV00015AA1
47
3
standoffs
SPC
Technology
2397
48
3
screws
Richco
NSS-4-4-01
Not Populated
15
1
J20
Jmpr_2pin
18
1
J31
Jmpr_3pin
23
1
R4
1 k
Venkel
CR0603-16W-1001FT
25
6
R8,R18,R19,R61,R63,R65
0
Venkel
CR0603-16W-000T
26
1
R9
453 
Venkel
CR0603-16W-4530FT
34
2
R59,R60
10 k
Venkel
CR603-16W-1002FT
Rev. 0.1
13
Si5328-EVB
10. Related Documents
AN775:
Si5328: Synchronous Ethernet* Compliance Test Report
AN776: Using the Si5328 in ITU G.8262-Compliant Synchronous Ethernet Applications
*Note: ITU-T G.8262Y.1362 EEC Options 1 and 2.
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Rev. 0.1
Si5328-EVB
APPENDIX—POWERUP AND FACTORY DEFAULT SETTINGS
These power-up settings were chosen because both 25 MHz and 156.25 MHz are common SyncE clock
frequencies. Also, the use of Free Run mode means that, at power-up, the EVB will produce an accurate SyncE
clock.
The power up settings for the Si5328 are as follows:
25 MHz input on CKIN1
CKIN2 is not used because of free run mode
25 MHz output on CKOUT1
156.25 MHz output on CKOUT2
Loop BW of 0.085 Hz
LVPECL outputs for CKOUT1 and CKOUT2
Rev. 0.1
15
Si5328-EVB
CONTACT INFORMATION
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Fax: 1+(512) 416-9669
Toll Free: 1+(877) 444-3032
Please visit the Silicon Labs Technical Support web page:
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and register to submit a technical support request.
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