Evaluation Board User Guide
UG-075
Rev. 0 | Page 3 of 16
EVALUATION BOARD HARDWARE
The following instructions are for setting up the physical
connections to the AD951x evaluation board.
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
Use the following steps to connect the AD951x evaluation
board to its power supply and lab equipment.
1.
Install the AD951x 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 should
be 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 computer. The red LED labeled CR2 (VBUS) on
the AD951x evaluation board should illuminate and
the CR1 (USBSTAT) LED should start 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 running the AD951x evaluation board software.
If the USBSTAT LED is not blinking, ensure that:
•
Jumpers are installed on Position S1 and Position 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, use the following steps:
1.
Connect a signal generator to the J10 SMA connector. By
default, the reference inputs on this evaluation board are
ac-coupled and terminated 50 Ω to ground. An amplitude
setting of 0 dBm to 6 dBm is fine.
2.
If the user wants to connect a signal to REF2, connect that
signal to the J13 SMA connector. DC-coupling is recom-
mended in applications requiring automatic hitless reference
switching. There is a possibility that the device receive
buffer can chatter when an ac-coupled clock stops toggling.
3.
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 OUT5 are ac-coupled LVPECLs. OUT8 and
OUT9 are dc-coupled and have no output termination. These
allow the user to evaluate the AD951x output driver in either
LVDS or CMOS mode.
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. Connect a bench power supply to TB1 on the evaluation
board. This is useful for making AD951x power consumption
measurements.
BYPASSING THE PLL (CLOCK DISTRIBUTION ONLY)
To bypass the PLL, connect a signal generator to the
SMA connector labeled CLK. By default, this connection
is ac-coupled to the CLK pin and terminated with a 50 Ω
resistor to ground. Refer to the Evaluation Software
Components section for details on running the AD951x
evaluation board software.
USING AN EXTERNAL VCXO
To use an external VCXO, use the following steps.
1.
Install a 0 Ω resistor at R9 and remove R8.
2.
Connect a loop filter and external VCO/VCXO input to J12.
3.
Connect the external VCO/VCXO output to the J11 SMA
connector (CLK input).
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