Datasheet

EVAL-AD7294
Rev. 0 | Page 9 of 24
VERIFYING THE LINKS AND POWERING UP THE
EVALUATION BOARD
Care should be taken before applying power and signals to the
evaluation board. It is necessary to ensure that all links are posi-
tioned correctly for the chosen operating mode. Table 2 shows
the position in which all the links are set when the evaluation
board is packaged. There are two different modes in which to
operate the evaluation board. The user can either operate the
board with an external supply or use the supply provided by the
USB port. When the board is shipped, it is assumed that the user
will be operating with the power provided by the USB port.
When using the power supply from the USB port,
1. Ensure that all links are positioned correctly for the chosen
operating mode. It is important to note that the USB con-
nector cannot act as a supply source to the AD7294 if the
K10, K11, K12, K13, and K14 links are not inserted.
2. Connect the USB cable to your PC and to the evaluation
board. Power is supplied automatically to the AD7294 after
the links are correctly positioned as outlined.
When using an external power supply,
1. Ensure that all links are positioned correctly for the chosen
operating mode.
2. Ensure that all relevant external power connections are
made before using the software for the device. You can supply
these signals from an external supply via the power supply
connectors (J3) on the board or use the on-board ADP3303
precision voltage reference.
3. Plug in the USB cable. If you do not wish to use the
software provided and all external supplies are used, this
cable is not required.
4. Turn on the external power supply.
After powering up the evaluation board, you can start using
the software to evaluate the board. Note that the board must be
repowered when the software window is closed; that is, the USB
must be disconnected and reinserted.
EVALUATING THE BOARD
The evaluation board software allows the user to load values to
the four DACs in the AD7294, read values from the 9-channel
multiplexed ADC and then depict these values in a plot, monitor a
signal between two limited values, and change the configuration
of the device. See the Using the Software section for more detailed
information about these functions.