Evaluation Board User Guide
UG-076
Rev. A | Page 3 of 16
EVALUATION BOARD HARDWARE
The following instructions are for setting up the physical
connections to the
When connecting the evaluation board to a PC for the first
time, the user must install the evaluation software prior to
connecting the evaluation board.
POWER AND PC CONNECTIONS
Perform the following steps, in order, to begin using the
evaluation board.
1.
evaluation software. Administrative
privileges are required for installation. The 64-bit versions
of Windows® are not supported.
2.
Connect the wall power supply to the main power
connector, labeled P2. The following five LEDs then turn
on: CR1 (USBSTAT), CR7 (VS), CR8 (VS-CP), CR9
(VS_USB), and CR10 (VS_LVPECL).
3.
Connect the USB cables to the evaluation board and the
PC. The LED labeled CR2 (VBUS) on the
evaluation board illuminates and the CR1 (USBSTAT) LED
starts blinking.
4.
If the Found New Hardware Wizard window
automatically appears when the evaluation board is
connected, select Install the software automatically
and click Next. The Found New Hardware Wizard
window may appear twice, and a system restart may be
required.
Refer to the Evaluation Board Software section for details on
If the USBSTAT LED is not blinking, ensure that
•
Jumpers are installed on Position S1 and on the SPI
position of S2.
•
The jumper on S4 is across the center pin and the minus
symbol.
•
The USB port on the PC is operational and that the USB
cable is not damaged.
SIGNAL CONNECTIONS
To connect signals, connect a signal generator to the J10 SMA
connector. By default, the reference inputs on this evaluation
board are ac-coupled and terminated with 50 Ω to ground. An
amplitude setting of 0 dBm to 6 dBm is acceptable.
To connect a signal to REF2, connect that signal to the J13 SMA
connector. DC-coupling is recommended in applications
requiring automatic hitless reference switching. There is a
possibility that the
receive buffer can chatter when an
ac-coupled clock stops toggling.
Connect an oscilloscope, spectrum analyzer, or other lab
equipment to any of the J0 to J9 SMA connectors on the right
side of the board.
OUT0 through OUT8 are ac-coupled low voltage positive
emitter coupled logic (LVPECL) outputs. OUT9 through
OUT11 are dc-coupled and have no output termination. These
outputs are intended to allow the user to evaluate the
output driver in complementary metal-oxide semiconductor
(CMOS) mode. To use OUT9 through OUT11 in LVPECL
mode, replace the 0 Ω resistors with 0.1 µF capacitors, and
install 200 Ω pull-down resistors.
BYPASSING THE WALL POWER SUPPLY
To bypass the wall power supply, remove the following ferrite
beads (on the backside of the board): F7, F4, F2, and F6. Next,
connect a bench power supply to TB1 on the evaluation board.
Bypassing is useful for making
power consumption
measurements.
BYPASSING THE PLL (CLOCK DISTRIBUTION ONLY)
To bypass the PLL, connect a signal generator to the SMA connec-
tor labeled CLK. By default, this connection is ac-coupled to
the CLK pin, and terminated with 50 Ω to ground. Refer to the
Evaluation Software Components section for details on running
the
evaluation board software.
USING AN EXTERNAL VCXO
To use an external VCXO,
1.
Install a 0 Ω resistor at R9 and remove R8.
2.
Connect a loop filter and the external VCO/VCXO input
to J12.
3.
Connect the external VCO/VCXO output to the J11 SMA
connector (CLK input).
USING I
2
C SERIAL PORT MODE
To use I
2
C serial port mode,
1.
Move Jumper S2 to the center and left (I
2
C) pins.
2.
Move Jumper W1 to the center and left (I
2
C) pins.
3.
Select the desired I
2
C address using Jumper S5 and
Jumper S6. Note that S5 = S6 = high is reserved for SPI mode.
4.
In the evaluation software, click Configure Serial Port
from the I/O menu (see Figure 24).
5.
Click Reset Serial Port, and then click Detect Current
Configuration. A dialog box appears and acknowledges
the I
2
C mode and address.
