8A3xxxx 72QFN EVK User Manual
© 2019 Integrated Device Technology, Inc.
5
February 14, 2019
VDDQx voltage selection jumpers – Each output voltage can be individually supplied with 1.8V, 2.5V, or 3.3V. These jumpers are used to
select the voltage for the output voltages.
Reset button – A small button is used to reset the board.
OSCI Input connector – An SMA connector, J45, can optionally supply a clock signal to overdrive the crystal.
Optional OCXO/TCXO Reference – An OCXO/TCXO footprint, is output at J82. It can be connected to J46 (below) as the reference for
the System DPLL.
SysDPLL Input – An SMA connector, J46, is provided to supply a local OCXO/TCXO reference as an optional reference for the System
DPLL.
Crystal – A crystal of various frequencies must be present for board operations. A 3225 footprint is provided for SMT crystals. For easy
plug-in of a canned crystal, two through holes are also available.
EEPROM – An SO-8 socket is provided to hold an EEPROM device of compatible package. An EEROM is used to store firmware and
customer configuration data, if needed.
1.2
Board Power Supply
The board uses a 5V supply for its power supplies. When running the board, please set the bench power supply at 5V/2A. The red jack
(J1) is positive; the black jack (J2) is the ground.
Multiple LDOs are used to generate 3.3V, 2.5V, and 1.8V from the +5V supply.
1.3
Voltage Selection Jumpers
There are eight headers/jumpers to select different voltages for different functional blocks of the chip. Each header has pin 1 and 3 labeled in
silkscreen – jumping pin 1 and pin 2 will select 3.3V; jumping pin 2 and pin 3 will select 2.5V; no jumper will have 1.8V.
Please see the following example for JP4 and JP9 – JP4 will select 2.5V; JP9 will select 3.3V.
Figure 2. Example of Voltage Jumpers
