Evaluation Board Hardware; Power Supplies; Motherboard Link Options; Daughter Board Link Options - Analog Devices EVAL-AD5325DBZ User Manual

EVAL-AD5325DBZ User Guide

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The nanoDAC® EVAL-MBnanoDAC-SDZ
supports single and dual power supplies.
The EVAL-AD5325DBZ 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 board. The
AGND and DGND planes are connected at one location on the
EVAL-MBnanoDAC-SDZ. It is recommended that AGND and
DGND not be connected elsewhere in the system to avoid
ground loop problems.
All supplies are decoupled to ground with 10 µF tantalum and
0.1 µF ceramic capacitors.
Table 1. Power Supply Connectors
Connector No. Label
J5, Pin 1 (J5-1) VDD
J5, Pin 2 (J5-2) AGND
J5, Pin 3 (J5-3) VSS
J6, Pin 1 (J6-1) VLOGIC
J6, Pin 2 (J6-2) DGND
Table 4. Link Functions
Link Number Function
REF1, REF2, REF3, 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
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
Position B selects the internal voltage source, 3.3 V from the
Position C selects an external supply voltage, V
LK6 This link selects the V
Position +3.3V selects the digital voltage source from the
Position VLOGIC selects an external digital supply voltage (V
LK7 This link selects the negative DAC analog voltage source.
Position A selects V
Position B selects AGND.
motherboard
Voltage
Analog positive power supply, V
Single and dual supply, 5.5 V
Analog ground
Analog negative power supply, V
Dual supply, −5.5 V
Digital supply from 1.8 V to V
Digital ground
as the reference source.
DD
voltage source.
LOGIC
.
SS

MOTHERBOARD LINK OPTIONS

Various link options are incorporated in the
MBnanoDAC-SDZ
conditions before using the board. Table 2 describes the
positions of the links to control the evaluation board via the
SDP-B board using a PC and external power supplies. The
functions of these link options are described in detail in Table 4.
The positions listed in Table 2 and Table 4 match the evaluation
board imprints (see Figure 11).
Table 2. Link Options Setup for
Link Number
REF1
REF2
REF3
REF4
LK5
DD
LK6
LK7

DAUGHTER BOARD LINK OPTIONS

SS
The EVAL-AD5325DBZ
DD
This link sets the least significant bit (LSB) of the I
the DAC. Table 3 describes the function of the link. Set LK1 to
Position B for proper device operation.
Table 3. Link Options for Daughter Board
Link Number
LK1
SDP-B
ADP121
.
DD
SDP-B
LOGIC
Rev. A | Page 3 of 13
and must be set for the required operating
SDP-B
Position
2.5V
EXT
EXT
EXT
C
+3.3V
B
daughter board has one link option.
Label Position
A0 A (high)
B (low, default)
board.
on the motherboard.
board (3.3 V).
).
UG-976
EVAL-
Control (Default)
2 C address of