IDT VersaClock 3S, 5P35021 User Manual

VersaClock® 3S - 5P35021 Evaluation Board

USER GUIDE

Introduction

The evaluation board is designed to help the customer eval uate the 5 P35021, the late st addition to the family o f 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 different combinations of frequencies.

Board Overview

Use Figure 1 and Table 1 to identify: power supply jacks, USB connector, input and output frequency SMA connectors.

Figure 1. 5P35021 Evaluation Board Overview

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VERSACLOCK® 3S - 5P35021 Evaluation Board

Table 1: Evaluation Board Pins and Functions

Item Name On-Board Connector Label Function

0 Power supply jack J18 Connect to 1.8V, 2.5V, or 3.3V for the output voltage of

the device

1 Ground jack J19 If J18 & J17are used for power supply, this is the return

power

2 Output voltage jack J17 Connect to 3.3V core voltage of the device
3 USB connector J3 Connect this USB to your PC to run IDT Timing

Commander

4 DIP switch U6 This is used to configure the device in different modes

5 Differential clock input CLKIN/CLKINB A differential clock can be connected as source for the

device

5

Single-ended clock input CLKINB A Single-ended clock can be connected as source for

(cont.)

6 Crystal, 25 MHz Y1 This crystal is used as a reference source for the clock

the device using CLKINB only

signal

7 Differential output DIFF_C1/T1 This can be a differential pair, or two single-ended

outputs. By default, it’s a LPHCSL differential output.

8 Differential output DIFF_C0/T0 This can be a differential pair, or two single-ended

outputs. By default, it’s a LPHCSL differential output.

9 Single-ended output SE_1 This is the single-ended output. By default it’s an

LVCMOS single-ended output

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VERSACLOCK® 3S - 5P35021 Evaluation Board

Figure 2A. (JP5: Pin 1 - 2 to Voltage Regulators)

Figure 2B. (JP5: Pin 2 - 3 to Banana Jack)

Board Power Supply

Power Supply Options

The core voltage includes a digital voltage VDD33 and an analog voltage VDDA. Both core voltages can be powered by an
external bench power supply or by USB.

• Bench Power Supply – To supply VDD33 with a bench power supply, connect power to J17. To supply VDDA with a bench

power supply, connect power to J18. At the same time, place the jumpers as shown in Figure 2B.

• 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 jumper as sho wn in Figure 2A. See JP5 jum per position for the o n-board voltage
regulators in the following figure. USB power source is recommended because it's readily available right from your laptop.

Figure 2. Jumping to the Pin configuration as shown (Figure 2A.) will select power source from on-board

voltage regulators powered by USB; Jumping to the Pin configuration as shown (Figure 2B.) will
select the bench power supply

Output Clock Voltages

Like VDDA an d VDD33 having two sources, each output voltage is also provided with two sou rces to choose from: bench power
supply or powered from USB. The selection is made by a 4-way header as shown in Figure 3 below.

The jumper can be used to select a voltage for E1, E2, E3, E4, and E5 respectively. The on-board voltage regulators powered
by USB are 1.8V, 2.5V and 3.3V; VDDOJ is from bench power supply connecting to JP17 and JP18. Each output voltage can
be individually selected. Use the label on the evaluation board: E1 for VDDDIFF1, E2 for VDDSE1, E3 for VDDDIFF2, E4 for
VDDSE2 and E5 for VDDSE3. The JP6 on the EVB needs to be in the default position as supplied by the manufacturer.

Note: Connect the USB to the board when using external power supply

Figure 3. Jumper Configuration for On-board Voltage Regulators

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