Evaluation Board
User Guide
UG-XXX
Rev. A | Page 3 of 14
EVALUATION BOARD HARDWARE
REQUIREMENTS
The user must install the evaluation software prior to
connecting the evaluation board. Administrative privileges are
required for software installation.
The following sections are for setting up the physical
connections to the AD9915 evaluation board.
POWER SUPPLY CONNECTIONS
The AD9915 evaluation board has one power supply connector
(four pins): P300. P300 powers the USB interface circuitry and
the AD9915.
Table 1shows the necessary connections and the appropriate
biasing voltage.
Table 1. Connections and Biasing Voltage
Connector
Pin No.
Label
Voltage (V)
P300
1,3
GND
0
P300
2
3.3V
3.3
P300
4
1.8V
1.8
INPUT CLOCK OPTIONS
The AD9915 architecture provides the user with two options when
providing an input CLOCK signal to the part. The first option
allows the user to provide a high frequency input signal,
connected to J104. The second option allows the user to connect
using a lower input reference frequency, enabling the clock
multiplier, and connects through J104.
Note: The input CLOCK path on the AD9915 evaluation board
uses an ADCLK925 clock buffer to drive the AD9915
differentially. That said, a slow slew rate into the ADCLK925
could dramatically limit the AD9915 in-close phase noise
performance.
Refer to theADCLK925 data sheet for details on the maximum
input speeds and input sensitivities.
JUMPERS SETTINGS
Use the jumper settings listed in Table 2 to enable different
modes of communication.
Table 2. Jumper Settings for Communication Modes
Mode
Settings
PC Control,
USB Port
(Factory
set)
Set Jumpers P203, P204, and P205 to
enable.
Install jumpers P105, P202.
Set Jumpers IOCFG0 to IOCFG4 to 1000
respectively.
External
Control
Set Jumpers P203, P204, and P205 to
disable. Control the AD9915 via external
header connectors.
Note, this document does not cover all aspects of externally
controlling the AD9915 evaluation board.
Device Communication
The AD9915 has a serial mode or parallel mode interface
option via the function pin settings (IOCFG0 to IOCFG3).
Refer to
Programming and Function Pins
Section in the
AD9915
datasheet for other possible configurations. However,
the AD9915 software GUI supports only serial mode operation
only. To drive the AD9915 in a parallel fashion requires
external control. As a result, header connectors are provided
for direct access to the AD9915 pins.
USB 1.1/2.0
Header connector P101 is used to place the DUT under the
control of an external controller (such as a microprocessor,
FPGA, or DSP).
Analog Devices provides a GUI for the PC; it does not provide
control software for external controllers.
