Evaluation Board Hardware; Motherboard Power Supplies; Link Options - Analog Devices EVAL-AD5678DBZ User Manual

EVAL-AD5678DBZ User Guide

EVALUATION BOARD HARDWARE

MOTHERBOARD POWER SUPPLIES

The EVAL-MBnanoDAC-SDZ
and dual power supplies.
The EVAL-AD5678DBZ evaluation board can be powered either
from the SDP port or externally by the J5 and J6 connectors, as
described in Table 1.
Both the 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 3. Link Functions
Link Number Function
REF1 to REF4 These links select the reference source.
Position EXT selects an off-board voltage reference via the appropriate EXT_REF_x 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, V
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 VLOGIC voltage source.
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 supports single
Voltage
Analog positive power supply, V
Single supply 5 V, dual supply 5 V.
Analog ground.
Analog negative power supply, V
Dual supply −5 V.
Digital supply from 1.8 V to V
Digital ground.
as the reference source.
DD
.
SS

LINK OPTIONS

A number of 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
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
Link No.
REF1
REF2
REF3
REF4
LK5
.
DD LK6
LK7
.
SS
.
DD
SDP-B board.
ADP121
.
DD
SDP-B
LOGIC
Rev. A | Page 3 of 13
and must be set for the required operating
SDP-B
Position
EXT
EXT
EXT
EXT
C
3.3V
B
= 5.5 V.
DD
on the motherboard.
board, 3.3 V.
.
UG-987
EVAL-
SDP-B board
Control (Default)