SiTime SiT95314 Manuel utilisateur

SiT95314EB User Manual | Rev 0.5

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SiT95314 Evaluation Board (EVB) HW User Manual

Table of Contents

1Introduction ......................................................................................................................................................................... 2

2Features.............................................................................................................................................................................. 2

3Top Level Block Diagram.................................................................................................................................................... 3

3.1. EVB Starter Guide ...................................................................................................................................................3

4Jumper Default List ............................................................................................................................................................. 5

5Status LEDs........................................................................................................................................................................ 5

6I2C/SPI On Board/External Configuration........................................................................................................................... 6

7SiT95314 EVK Board Power Supply Connection Details.................................................................................................... 6

7.1. VDDIN and VDDOX Supply Regulator.....................................................................................................................6

7.2. VDD Supply Regulator.............................................................................................................................................7

7.3. GPIO_VDD Supply Regulator..................................................................................................................................8

8External Clock Reference Input (X1/X2).............................................................................................................................. 9

9Input Clock Circuitry (INx_P/INx_N).................................................................................................................................. 10

10 Output Clock Circuitry (OUTxP/OUTxN) ........................................................................................................................... 11

11 GPIO Configuration........................................................................................................................................................... 12

12 EEPROM Configuration .................................................................................................................................................... 13

13 MSP430 Programming Instructions................................................................................................................................... 13

14 SiTime Clock GUI Installation and EVB Configuration ...................................................................................................... 16

SiT95314 Evaluation Board (EVB) HW User Manual

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1 Introduction

The SiT95314 Evaluation Board is designed for evaluating the SiT95314 Quad PLL Frequency Translator, Jitter Cleaner.

Figure 1. SiT95314 EVK Board

2 Features

1) Support SiT95314 part

2) Powered from USB Port or External Power supply

3) 4 Differential Output Clocks supporting wide frequency range

a. Differential Output from 0.5 Hz to 2.94912 GHz

b. Single Ended Output from 0.5 Hz to 250 MHz

c. Differential Input from 8 KHz to 2.1 GHz

d. Single Ended Input from 8 KHz to 250 MHz

4) Support LVPECL, CML, HCSL, LVDS and LVCOMS Output Standards

5) Status LEDs for power supplies

6) SMA connectors for input clocks, output clocks and external reference clock/XO Input clock

7) I2C or SPI communication via MS430 MCU

8) On board LDO’s with configurable jumpers for all Power supplies.

9) SiTime Clock GUI to configure the EVK via USB

10) Additonal USB Support for powering up the 2 Output Drivers

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3 Top Level Block Diagram

Below is the Top Level Block Diagram for SiT95314 EVK. The Evaluation board can be connected to a PC via the MAIN USB

Connector for programming, control and monitoring. The on board MSP430 MCU is used for I2C/SPI communication from

SiT95314 using SiTime Clock GUI.

Refer to the SiT95314 Clock GUI manual and User Guide for more information.

Figure 2. Top Level Block Diagram

3.1. EVB Starter Guide

Power up the SiT95314 EVB using 5 V Supply from a USB cable connected to the PC where the SiTime Clock GUI is

installed. All the supplies on board are powered from the on board USB connector. There are 2 USB connectors on the

SiT95314 EVK. J1 is the main USB connector that is used for chip communication alongwith supplying power to all the other

subsystems of the chip.

J4 is an additional USB connector that can be used for supplying power to the Output Driver Supplies (ODR_SUPPLY_x) if the

power supplied from J1 is limited ( J1 is limited to ~500 mA as it comes from the USB 2.0 from PC).Default EVK configuration

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enables the chip subystems to be powered from J1 connector. In order to power the Output Drivers separately from J4

connector, change the J2 default Jumper configuration from 2 to 3 on J2 and connect to J3 and pin 2 of J2. J4 is not installed

by default.

There is an additional provision to power up the Output Drivers from External Supply as well. To connect an external power

supply, change the default EVK configuration on J2 from 2 to 3 to 1 to 2.

The external Power supply can be connected to H1 2 pin Header (Refer Section 7)

The default Jumper configuration is already done on the EVK board (Refer to Table 1).

Launch the SiTime Clock GUI Software. (Refer to SiTime Clock GUI User Guide for more information)

Default Output Driver Configuration is LVDS and Output Driver Supplies are configured to 3.3 V.

Default Supply for VDD = 1.8 V and VDDIN = 3.3 V.

SiT95314 chip on the EVK can be configured to communicate through I2C/SPI after configuring the same from SiTime

SiT95314 Clock GUI.

Figure 3. EVB Starter Connection Diagram

SiT95314 Evaluation Board (EVB) HW User Manual

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4 Jumper Default List

Table 1. SiT95314 Jumper Default List

Jumper location

Type

I=Installed

Jumper location

Type

I=Installed

4 -Pin

2 to 3

J49

3 -Pin

1 to 2

3 -Pin

2 to 3

J54

3 -Pin

1 to 2

J71

3 -Pin

1 to 2

J51

3 -Pin

1 to 2

J65

3 -Pin

1 to 2

J56

3 -Pin

1 to 2

J61

3 -Pin

1 to 2

J72

3 -Pin

J70

3 -Pin

1 to 2

J40

3 -Pin

2 -Pin

J21

3 -Pin

1 to 2

J16

2 -Pin

J50

3 -Pin

1 to 2

3 -Pin

1 to 2

J33

3 -Pin

1 to 2

J10

3 -Pin

1 to 2

J81

3-Pin

J34

3 -Pin

1 to 2

J52

3 -Pin

1 to 2

5 Status LEDs

Table 2. Status LED Indication

Location

Color

Status Indication

Green

5V Additional USB Power

Green

5V Main USB Power

Green

MSP430 LDO Power

Figure 4. Status LEDs

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6 I2C/SPI On Board/External Configuration

The SiT95314 chip can be configured to communicate with I2C and SPI 4 Wire with SiTime SiT95314 Clock GUI. The default

EVK configuration will enable the I2C communication with the chip.

To change the communication to SPI 4 Wire, it is preferable to remove the jumpers J9 and J16.

External Hardware can also be used to communicate with the SiT95314 chip in I2C/SPI using the J31 connector. When using

external connection option, remove R267, R293, R295 and R297 and solder R292, R294, R296 and R298 ( each 0 Ω) to

enable the external interface to the chip using J31.

7 SiT95314 EVK Board Power Supply Connection Details

The power supplies on the EVK are configured to 3.3 V by default except the VDD supply which is set to 1.8 V.The on board

supplies/LDO’s are also configurable to 1.8 V and 2.5 V.

There is a provision for connecting external supplies after bypassing the on board regulators for all the supplies.

Please refer to SiT95314 datasheet for configuring the supply voltages on the various Power Supply rails.

7.1. VDDIN and VDDOX Supply Regulator

Figure 5. Supply Regulator for VDDIN and VDDoX Supply

Note: For changing the LDO Output Power Supply Voltage, connect the corresponding Jumpers (for ex- J70) in Figure 5 to below

settings:

1. 3.3 V - Connect the 3-Pin Jumper from 1 to 2.

2. 2.5 V - Connect the 3-Pin Jumper from 2 to 3.

3. 1.8 V - Remove the Jumper.

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7.2. VDD Supply Regulator

Figure 6. Supply Regulator for VDD Supply

Note: For changing the VDD (for ex- J72) Supply, connect the Jumper to below settings:

1. 3.3 V - Connect the 3-Pin Jumper from 2 to 3.

2. 2.5 V -Connect the 3-Pin Jumper from 1 to 2.

3. 1.8 V -Remove the Jumper.

VDD should be configured to 1.8V by default.

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7.3. GPIO_VDD Supply Regulator

Figure 7. Supply Regulator for GPIO_VDD Supply

Note: For changing the GPIO_VDD (for ex- 40) Supply, connect the Jumper to below settings:

1. 3.3 V - Connect the 3-Pin Jumper from 2 to 3.

2. 2.5 V - Connect the 3-Pin Jumper from 1 to 2.

3. 1.8 V - Remove the Jumper.

GPIO_VDD is configured to 1.8V by default.

Based on SiT95314 GUI configuration, VDDIO supply (Internal supply for IO rail) can be configured to follow either VDD(1.8V)

or VDDIN(3.3V). When VDDIO supply is configured to follow VDDIN(3.3V), GPIO_VDD supply jumper J40 needs to be

changed from open to 1-2.

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8 External Clock Reference Input (X1/X2)

The SiT95314 EVB has the SiT30100 oscillator (Y4) soldered for providing a stable reference clock to SiT95314.

The EVB can also connect to an external reference clock using the SMA connector(J15).

For changing from SiT30100 oscillator to external reference clock configuration, uninstall R310(0 Ω) and install C149(1uF).

Refer to the SiT95314 datasheet for the XO Pathway connection options.

Figure 8. External Reference Connection

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9 Input Clock Circuitry (INx_P/INx_N)

The SiT95314 EVB has 4 Differential Inputs and 8 Single Ended Inputs (IN0P/IN0N, IN1P/IN1N, IN2P/IN2N, IN3P/IN3N) for

receiving the external clock input signals. The input clock termination arrangement is shown in Figure 9. All the Input clocks

are AC Coupled and having single ended 50 Ω terminations by default. The Inputs can be configured either to work as Single

Ended(AC/DC) or Differential(AC/DC) based on the required configuration.

Input Clocks can be configured as:

11) Single Ended AC Coupled ( with the default EVK Input Termination Connection)

12) Single Ended DC Coupled ( Change C130 (1uF) to 0 ohms short –R4 and R18 can also be removed if the Single

Ended External Source is not able to drive the 50 ohms load)

13) Differential DC Coupled ( connect R62 also apart from the default EVK Input termination Connection)

14) Differential AC Coupled (with the default EVK Input Termination Connection)

Refer to the SiT95314 Datasheet for the Single Ended and Differential Input Termination connection information.

Figure 9. Input Clock Termination Circuit

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