Analog Devices EVAL-AD5313RDBZ, User Manual

Page: 3 / 13

EVAL-AD5313RDBZ User Guide UG-965
Rev. A | Page 3 of 13
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The nanoDAC® EVAL-MBnanoDAC-SDZ motherboard
supports single and dual power supplies.
The
EVAL-AD5313RDBZ evaluation board can be powered
either from the SDP-B port or externally by the J5 and J6
connectors, as described in Table 1.
Both AGND and DGND inputs are provided on the
EVAL-
AD5313RDBZ evaluation board. The AGND and DGND planes
connect at one location on the EVAL-MBnanoDAC-SDZ . It is
recommended that AGND and DGND do not connect
elsewhere in the system to avoid ground loop problems.
All supplies are decoupled to ground with a 10 µF tantalum
capacitor and 0.1 µF ceramic capacitor.
Table 1. Power Supply Connectors
Connector No. Label Voltage
J5, Pin 1 (J5-1) VDD Analog positive power supply, V
DD
;
5.5 V single- and dual-supply
J5, Pin 2 (J5-2) AGND Analog ground
J5, Pin 3 (J5-3) VSS Analog negative power supply, V
SS
;
5.5 V dual-supply
J6, Pin 1 (J6-1) VLOGIC Digital supply from 1.8 V to V
DD
J6, Pin 2 (J6-2) DGND Digital ground
LINK OPTIONS
A number of link options are incorporated in the EVAL-
MBnanoDAC-SDZ and must be set for the required operating
conditions before using the EVAL-AD5313RDBZ . Table 2
describes the positions of the links to control the evaluation
board via the
SDP-B controller board using a PC and external
power supplies. The functions of these link options are described in
detail in Table 3. The positions listed in Table 2 and Table 3
match the evaluation board imprints (see Figure 12).
Table 2. Link Options Setup for SDP-B Control (Default)
Link Number Position
REF1 2.5V
REF2 EXT
REF3 EXT
REF4 EXT
LK5 C
LK6 +3V3
LK7 B
DAUGHTER BOARD LINK OPTIONS
The EVAL-AD5313RDBZ has two link options, LK1 and LK2,
and it is recommended to remove the link from the EVAL-
AD5313RDBZ .
Table 3. Link Functions
Link Number Position
REF1 to REF4 These links select the reference source.
Position EXT selects an off board voltage reference via the appropriate EXT_REF connector.
Position VDD selects V
DD
as the reference source.
Position 4.096V selects the on-board 4.096 V reference as the reference source.
Position 2.5V selects the on-board 2.5 V reference as the reference source.
Position 5V selects the on-board 5 V reference as the reference source.
LK5 This link selects the positive DAC analog voltage source.
Position A selects the internal voltage source from the SDP-B controller board. Only the 2.5 V on-board reference can
be used with this configuration.
Position B selects the internal voltage source 3.3 V from the ADP121 .
Position C selects an external supply voltage, V
DD
.
LK6 This link selects the VLOGIC voltage source.
Po3.3V selects the digital voltage source from the SDP-B controller board (+3V3).
Position VLOGIC selects an external digital supply voltage (V
LOGIC
).
LK7 This link selects the negative DAC analog voltage source.
Position A selects V
SS
.
Position B selects AGND.