Evaluation Board User Guide
UG-077
Rev. 0 | Page 3 of 16
EVALUATION BOARD HARDWARE
The following instructions are for setting up the physical
connections to the AD9522 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
1.
Install the AD9522 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_DRV).
3.
Connect the USB cables to the evaluation board and
the computer. The red LED labeled CR2 (VBUS) on
the AD9522 evaluation board should illuminate and the
CR1 (USBSTAT) LED should start blinking.
4.
If the
Found New Hardware Wizard
window automati-
cally 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 AD9522 evaluation board software.
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 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 50 Ω to ground. An
amplitude setting of 0 dBm to 6 dBm is fine.
If the user wishes 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 AD9522 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 LVDS outputs. OUT9
through OUT11 are dc-coupled and have no output termina-
tion, and allow the user to evaluate the AD9522 output driver
in CMOS mode. To use OUT9 through OUT11 in LVDS mode,
the user must replace the 0 Ω resistors with 0.1 μF capacitors.
BYPASSING THE WALL POWER SUPPLY
To bypass the wall power supply, remove the following
ferrite beads (on the back side of the board): F7, F4, F2,
and F6. Then connect a bench power supply to TB1 on the
evaluation board. This is useful for making AD9522 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 50 Ω to ground.
Refer to the Evaluation Board Software section for details on
running the AD9522 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 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.
On the evaluation software, select
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.
