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USER GUIDE

VersaClock® 5 - 5P49V5943/44 Evaluation Boards

Introduction

The evaluation board is designed to help the customer evaluate the 5P49V5943/44, the latest addition to the family of

programmable devices in IDT's Timing portfolio. When the board is connected to a PC running IDT Timing Commander™

Software through USB, the device can be configured and programmed to generate frequencies with best-in-class performances.

Board Overview

Use the following diagram and table to identify: power supply jacks, USB connector, input and output frequency SMA connectors.

Figure 1. 5P49V4943/44 Evaluation Board

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Table 1: 5P49V5943/44 EBV Pins and Functions

Item Name On-Board Connector

Label

Function

1 Output 0 J3 Single ended buffered output of input reference clock

2Output Voltage Power

Supply Selector OUT0_SELB_I2C : JP2

4-way header to select a power supply method for output 0. The

center pin is the output voltage. Use jumper JP2 to select 3.3V, 2.5V,

1.8V or VDDO_J supply. VDDO_J is the voltage from J15

3 Power Supply Jack J16 Connect 3.3V, 2.5V or 1.8V for the core voltage of the device

4Input Voltage Power Supply

Selector JP3 Provides selection of VDDA_REG supply from regulators or VDDD_J

supply from J16

5 CLKIN_S J1 SMA Pair used to monitor differential input CLKIN

6 Clock Input J2/J4 Used as primary clock input in 5P49V5943

7 CLKINB_S J5 SMA Pair used to monitor differential input CLKINB

8Input Voltage Power Supply

Selector JP5 Provides selection of VDDD_REG supply from regulators or

VDDD_J supply from J16

9Xin J6

Used as primary single ended clock input in 5P49V5944. Maximum

full swing limited to 1.2V

10 USB Interface J18 Used for connection with a PC and for interaction with the IDT Timing

Commander Software.

11 Output Voltage Power

Supply Selector OUT1 : JP4

4-way header to select a power supply method for output 1. The

center pin is the output voltage. Use jumper JP4 to select a 3.3V,

2.5V, 1.8V or VDDO_J supply. VDDO_J is the voltage from J15

12 Output 1 J10/J9 Can be differential pair output or two individual single ended outputs

13 Ground Jack J17 Used for grounding. If J15 and/or J16 is used for power supply, this

jack functions as the power return.

14 Aardvark Connector JP1 For Aardvark connection

15 DIP Switch U2

S1: Output Enable(OE/SD)

S2: Sel0

S3: Sel1

S8: Sel [1:0] ; Default: I2C mode

16 Output Voltage Power

Supply Selector JP6

4-way header to select a power supply method for output 2. The

center pin is the output voltage. Use jumper JP6 to select a 3.3V,

2.5V, 1.8V or VDDO_J supply. VDDO_J is the voltage from J15

17 Output 2 J13/J11 Can be differential pair output or two individual single ended outputs

18 Output Voltage Jack J15 Connect 3.3V, 2.5V or 1.8V for the core voltage of the device

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VERSACLOCK® 5 - 5P49V5943/44 Evaluation Boards

Board Power Supply

Power Supply Options

Bench Power Supply – An external power supply can be used to supply a 3.3V, 2.5V or 1.8V supply. To supply VDDD_J with a

bench power supply, connect power to J16. Concurrently, place the jumpers in JP3 to connect VDDA_1 to VDDD_J.

USB Power Supply – When the board is connected to a PC through a USB cable, on-board voltage regulators will generate a

3.3V for the device. In this case, place the jumpers in JP3 to connect VDDA_1 to VDDA/D. See JP3 jumper position for VDDA/D

in the Figure 2. USB power source is recommended for ease of use.

Figure 2. Selecting the VDDA_REG side will select power source from on-board regulators powered by

USB; Selecting the VDDD_J side will select external bench power supply

Output Clock Voltages

Similar to VDDA_1 having two sources, each output voltage is also provided with two sources to choose from: Bench power

supply or USB power supply connection. The selection is made by a 4-way header as shown in Figure 3 below. Selection of

VDDO_J will enable external power supply (J15 and J16 are connected to external power supply); selection of 3.3V, 2.5V or 1.8V

will enable the on-board voltage regulators powered by USB port.

Figure 3. In the 4-way header, the central pin is the output and the other pins are 1.8V, 2.5V, 3.3V and

VDDO_J (from J15) respectively. Jumper settings are selected according to the output voltage

required for outputs 0, 1 and 2.

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VERSACLOCK® 5 - 5P49V5943/44 Evaluation Boards

Connecting the Board

The board is connected to a PC through a USB connector for configuring and programming the device, as shown in Figure 4

below. The USB interface will also provide +5V power supply to the board, from which on-board voltage regulators generate

various voltages for the core as well as for each output.

The board can also be powered by a bench power supply by connecting two banana jacks J15, J16 for output and core voltages,

respectively. Please see board power supply section for details.

Note: The USB port only supports USB 2.0; USB 3.0 is not supported at this time.

Figure 4. Connecting 5P49V5943/44 - EVB USB Port for Communications with Timing Commander Software

and input voltage supplies

On-Board Crystal

A 25MHz crystal is installed on the board. Note: For the 5P49V5943, the clock input is given through J2 and J4 SMA connections.

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VERSACLOCK® 5 - 5P49V5943/44 Evaluation Boards

Board Default Frequency Output

When 25MHz crystal is installed, the device will have the following default outputs: OUT0 = 25MHz, OUT1=100MHz

Configuration and Setup

Use the following steps to setup the board using I2C and start the configuration of the board.

1. Set SEL pin (pin 8) of dip switch (U2) to "0" to select I2C mode.

2. Connect J18 to a USB port of the PC using the supplied I2C cable.

3. Launch VC5 Timing Commander Software (refer to VC5 Timing Commander User Guide - Getting Started Step 1~7)

Download the VersaClock 5 Timing Commander User Guide Here

4. Following the Getting Started steps in the Timing Commander software, an I2C connection is established between the GUI

software and the VersaClock 5 chip.

5. Select "Open Settings File" if you have existing settings or “New Settings File” and select 5P49V5943 or 5P49V5944

depending on your evaluation board. In the same screen, browse for a personality file, by clicking on the button at the bottom

right, to be used with the evaluation board.

6. Connect to the EVB by clicking on the microchip icon located at the top right of the Timing Commander.

7. Once connected, new options will be available on a green background indicating that the EVB has successfully connected

with the board. Write the settings to the chip by clicking on the write all registers to the chip option.

8. All intended outputs should now be available for measurement.

Board Schematics

Evaluation board schematics are shown on the following pages.

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Figure 5. 5P49V5943/44 VersaClock 5 Evaluation Board Schematics – Page 1

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Figure 6. 5P49V5943/44 VersaClock 5 Evaluation Board Schematics – Page 2

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Figure 7. 5P49V5943/44 Evaluation Board Schematics – Page 3

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Signal Termination Options

Termination options for OUTPUT 1 and 2 for the 5P49V5943 and 5P49V5944 EVB board are displayed in Figure 8. The

termination circuits are designed to optionally terminate the output clocks in LVPECL and LVDS signal types by populating (or

not-populating) some resistors. DC or AC coupling of these outputs are also supported.

Tab le 2 and Ta bl e 3 tabulate component installations to support LVPECL and LVDS signal types for OUTPUT 1 and 2 on the

5P49V5943 and 5P49V5944 EVB. Please note that by doing so, the output signals will be measured and terminated by an

oscilloscope with a 50 internal termination.

Figure 8. 5P49V5943 Output Termination Options

Termination Options for 5P49V5943 and 5P49V5944

Table 2: Termination Options for OUTPUT1

Table 3: Termination Options for OUTPUT2

As noted, 4-resistor network is not installed in Table 2 and 3 because oscilloscope with internal 50 termination is utilized for

signal termination and measurement. If an AC-coupled, stand-alone LVPECL output is needed (without oscilloscope

connections), the 4-resistor network needs to be installed accordingly.

Signal Type Series Resistors:

R29, R32

Pull-down Resistors:

R33, R34

Series Capacitor:

C9, C10

Resistor Network:

R18, R19, R23, R24

LVC M O S 3 3 Not installed 0.1 µF Not installed

Signal Type Series Resistors:

R37, R43

150-ohm pull-down:

R45, R46

Series Capacitor:

C11, C13

Resistor Network:

R30, R31, R35, R36

LVPECL 0 Not installed 0.1 µF Not installed

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VERSACLOCK® 5 - 5P49V5943/44 Evaluation Boards

Orderable Part Numbers

The following evaluation board part numbers are available for order.

Table 4: Orderable Part Numbers

Part Number Description

EVKVC5-5943ALL 5P49V5943 Evaluation board with one output of each type of signal termination.

EVKVC5-5944ALL 5P49V5944 Evaluation board with one output of each type of signal termination.

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this document, including descriptions of product features and performance, is subject to change without notice. Performance specifications and the operating parameters of the described products are determined

in the indepe ndent stat e and are n ot gua rant eed to per form th e same w ay when insta lled i n cu stomer p rodu cts. The info rmati on con tain ed here in is provi ded with out rep resen tati on or wa rranty o f a ny kin d, w hethe r

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