The evaluation board is designed to help the customer evaluate the 5P35023 device, 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 a USB, the
device can be configured and programmed to generate different combinations of frequencies.
Board Overview
Use Figure 1 and Table 1 to identify: USB connector and the input and output frequency SMA connectors.
VersaClock® 3S - 5P35023 Evaluation Board User Manual
Label
Number
Name
1DIP SwitchSW1
On-board Connector
Label
Function
This is used to set outputs enable/disable on the IC and switches DFC
in different configurations.
2Reference OutputREFThis is the reference or buffered output from the crystal.
Differential Clock InputCLKIN/CLKINBA differential clock can be connected as source for the device.
3
Single-ended Clock InputCLKINB
A Single-ended clock can be connected as source for the device using
CLKINB only.
4Crystal, 25MHzThis crystal is used as a reference source for the clock signal.
5USB ConnectorJ3Connect this USB to your PC to run IDT Timing Commander.
ADifferential Output #2DIFF_T2/C2
This can be a differential pair, or two single-ended outputs. By default,
it’s an LPHCSL differential output.
BOutput-enable ConnectorOE3This port can be used in Pro-active Power Saving (PPS) mode.
CSingle-ended OutputSE_3
DDifferential Output #1DIFF_T1/C1
This is the single-ended output. By default it’s an LVCMOS
single-ended output.
This can be a differential pair, or two single-ended outputs. By default,
it’s LPHCSL differential output.
EOutput-enable ConnectorSMA_OE1This port can be used in Pro-active Power Saving (PPS) mode.
FSingle-ended OutputSE_1
GSingle-ended OutputSE_2
This is the single-ended output. By default it’s an LVCMOS
single-ended output.
This is the single-ended output. By default it’s an LVCMOS
single-ended output.
HOutput enable ConnectorOE2This port can be used in Pro-active Power Saving (PPS) mode.
IOutput Voltage SelectorE1, E2, E3, E4, E5
This is a four-way header used to select an output voltage. Connect
center pin to GND, and then the respective voltage (3.3V as default).
JInput SelectorJP5, JP6This is used to configure input from USB or external power supply.
Board Power Supply
Power Supply Options
The core voltage includes a digital voltage V
▪ USB Power Supply only – 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 shown in Figure 2. See the JP5 jumper position for the on-board voltage
regulators in the following figure. USB power source is recommended because it's readily available right from your laptop.
and an analog voltage V
DD33
. Both core voltages can be powered by USB as default.
VersaClock® 3S - 5P35023 Evaluation Board User Manual
Figure 2. JP5 Jumper Position (pins 1 & 2) for the On-Board Voltage Regulators
Jumping to the pin configuration as shown will select the power source from on-board voltage regulators powered by USB.
Output Clock Voltages
Like V
DDA
and V
having two sources, each output voltage is also provided with two sources to choose from: bench power supply or
DD33
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; V
Note: Each output voltage can be individually selected. Use the label on the evaluation board: E1 for V
V
Figure 3. Jumper Configuration for On-board Voltage Regulato rs
DDDIFF2
, E4 for V
DDSE2
is from bench power supply connecting to JP17 and JP18
DDOJ
and E5 for V
DDSE3
.
DDDIFF1
, E2 for V
DDSE1
, E3 for
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.
Note: The USB port only supports USB 2.0; USB 3.0 is not supported at this time.
VersaClock® 3S - 5P35023 Evaluation Board User Manual
DIFF_T1/C1
DIFF_T2/C2
Signal Termination Options
Termination options for differential output 1–2 in the evaluation board are displayed in Figure 9. The termination circuits are designed to
optionally terminate the output clocks in LVPECL, LVDS, LVCMOS and HCSL signal types by populating (or not-populating) some
resistors. DC or AC coupling of these outputs are also supported.
Table 5 and Table 6 tabulates component installations to support LVPECL, LPHCSL, LVCMOS and LVDS signal types for output 1–2,
respectively. Note that by doing so, the output signals will be measured and terminated by an oscilloscope with a 50Ω internal
termination.
Figure 9. Output Termination Options
Table 5. Termination Options for Differential Output 1 (DIFF_T1/C1)
As noted, 4-resistor network is not installed in Table 5 and Table 6 because oscilloscope with internal 50Ω 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.
Table 7. Termination for Single-ended Output 1 (SE_1)
Signal TypeSeries Resistors: R1Series Capacitors: C16
VersaClock® 3S - 5P35023 Evaluation Board User Manual
June 8, 2017
▪ Updated user manual to new format.
▪ Updated all images and made several textual changes throughout.
▪ Updated Evaluation Board Schematics drawings.
May 27, 2016Initial release.
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