Datasheet
Evaluation Board User Guide UG-094
Rev. A | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The EVAL-AD527xSDZ supports single and dual power supply.
In a single-power supply, the evaluation board can be powered
from the SDP port or externally by the J1, J2 and J3 connectors,
as shown in Table 1.
If dual-supply mode is required, the J1, J2 and J3 connectors
must provide the external power supply, as shown in Table 1.
All supplies are decoupled to ground with 10 μF tantalum and
0.1 μF ceramic capacitors.
Table 1. Maximum and Minimum Voltages Connectors
Connector No. Voltage
J1 Analog positive power supply, VDD.
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.
J2 Analog GND.
J3 Analog negative power supply, VSS.
For single-supply operation, it is 0 V.
For dual-supply operation, it is −2.5 V to −2.75 V.
LINK OPTIONS
A number of link and switch options are incorporated in the
evaluation board and should be set for the required operating
setup before using the board. The functions of these link options
are described in detail in Table 3. Table 2 describes the positions
of the different links to control the evaluation board by PC, via
the USB port, using the AD527xSDZ is single-supply mode.
Table 2. Link Options Setup for SDP Control (Default)
Link No. Options
LK1 Inserted
LK8 B
LK9 B
LK10 B
Table 3. Link Functions
Link No. Option
LK1 This link connects Terminal A of the digital rheostat to VDD.
LK8 This link selects the positive power supply.
Terminal A = 5 V (from SDP).
Terminal B = 3.3 V (from ADP3303).
Terminal C = the external supply from the J1 connector.
LK10 This link selects the negative power supply.
Terminal A = the external supply from the J3 connector.
Terminal B = analog GND.
LK3 (AD5272 Only) This link selects the voltage in the ADDR pin.
Terminal A = GND.
Terminal B = VDD.
In single supply only, NC (no connect) = high impedance.
LK9
This link selects whether the EVAL-AD527xSDZ is controlled by the SDP connector via the USB or by the external
source via the SMB connectors.
Terminal A = SMB connectors.
Terminal B = SDP connector.