Datasheet

Evaluation Board User Guide UG-236
Rev. 0 | Page 3 of 16
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The EVA L-AD5254SDZ supports the use of single and dual
power supplies.
In single-supply mode, the evaluation board can be powered
either from the SDP port or externally by the J1-1, J1-2, and
J1-3 connectors, as described in Table 1.
If dual-supply mode is required, the J1-1, J1-2, and J1-3 connectors
must provide the external power supply, as described in Tabl e 1.
All supplies are decoupled to ground using 10 µF tantalum and
0.1 µF ceramic capacitors.
Table 1. Maximum and Minimum Voltages of the Connectors
Connector No. Label Voltage
J1-1 EXT VDD Analog positive power supply, V
DD
.
For single-supply operation, it is
2.7 V to 5.5 V.
For dual-supply operation, it is
2.5 V to 2.75 V.
J1-2 GND Analog GND.
J1-3 EXT VSS Analog negative power supply, V
SS
.
For single-supply operation, it is 0 V.
For dual-supply operation, it is
−2.5 V to −2.75 V.
LINK OPTIONS
Several link and switch options are incorporated in the evalu-
ation board and should be set up before using the board. Table 2
describes the positions of the links to control the evaluation board
by a PC, via the SDP board, using the EVAL-AD5254SDZ in
single-supply mode. The functions of these link and switch
options are described in detail in Table 3 through Table 6.
Table 2. Link Options Setup for SDP Control (Default)
Link No. Option
A25 3.3 V
A24 GND
Table 3. Link Functions
Link No. Power Supply Options
A25 V
DD
This link selects one of the following as the positive power supply:
5 V (from SDP).
3.3 V (from SDP).
EXT VDD (external supply from the J1-1 connector).
A24 V
SS
This link selects one of the following as the negative power supply:
GND (analog ground).
VDD VSS (external supply from the J1-3 connector).