Analog Devices EVAL-AD5693RSDZ, Руководство пользователя

Страница: 7 / 12

EVAL-AD5693RSDZ User Guide UG-675
Rev. A | Page 7 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The AD5693R evaluation board can be powered through the
SDP board or externally by the VPOS_EXT and AGND
connectors.
Both AGND and DGND inputs are provided on the board. The
AGND and DGND planes are connected at one location close to
the
AD5693R . To avoid ground loop problems, it is recommended
not to connect AGND and DGND elsewhere in the system.
All supplies are decoupled to ground with 10 µF tantalum and
0.1 µF ceramic capacitors.
Table 2. Power Supply Connectors
Connector No. Voltage
J2, Pin 1 Analog positive power supply, V_EXT
J2, Pin 2 AGND
LINK OPTIONS
Various link and switch options are incorporated on the EVAL-
AD5693RSDZ evaluation board and must be set for the required
operating conditions before using the board. The functions of
these link options are described in detail in Table 4.
Table 3 describes the positions of the different links controlled
by the PC via the USB port. An SDP board operating in single-
supply mode is required.
Table 3. Link Options Setup for SDP Control (Default)
Link No . Options
A11 A
LINK Disconnected
A1 A
Table 4. Link Functions
Link No. Options
A1 This link selects the DAC digital voltage source.
Position A selects an external reference source via the SMB input, EXT_REF.
Position B selects the
REF192 external reference.
Position C selects the ADR431 external reference.
LINK Connect only if the EVAL-AD5693RSDZ board of the AD5693R is controlled through the PMOD connector and the SDP
board is not connected.
A11 This link selects the DAC analog voltage source.
Position A VPOS is powered at 3.3 V.
Position B VPOS is powered from an unregulated USB supply.
Position C VPOS is powered from an external supply voltage (V_EXT).