EVAL-AD5344DBZ User Guide UG-985
Rev. A | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The nanoDAC® E VA L -MBnanoDAC-SDZ motherboard
supports single and dual power supplies.
The E VA L-AD5344DBZ evaluation board can be powered from
either the SDP-B port or externally by the J5 and J6 connectors,
described in Table 1.
Both AGND and DGND inputs are provided on the evaluation
board. The AGND and DGND planes are connected at one
location on the E VA L -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 10 µF tantalum
capacitors and 0.1 µF ceramic capacitors.
Table 1. Power Supply Connectors
Connector Label Voltage
J5, Pin 1 (J5-1) VDD Analog positive power supply, VDD;
5.5 V single and dual supply
J5, Pin 3 (J5-3) VSS Analog negative power supply, VSS;
−5.5 V dual supply
J6, Pin 1 (J6-1) VLOGIC Digital supply from 1.8 V to VDD;
J6, Pin 2 (J6-2) DGND Digital ground
LINK OPTIONS
A number of link options are incorporated in the EVA L -
MBnanoDAC-SDZ and must be set for the required operating
conditions before using the evaluation board. Table 2 describes
the positions of the links that control the evaluation board via
the SDP-B controller board using a PC and external power
supplies. The positions listed in Table 2 through Table 4 match
the evaluation board imprints, see Figure 10.
Table 2. Link Options Setup for SDP Control (Default)
Link Number Position
REF1 2.5 V
REF2 2.5 V
REF3 2.5 V
LK6 +3V3
LK7 B
DAUGHTER BOARD LINK OPTIONS
The E VA L -AD5344DBZ daughter board has two link options.
The links control the settings of the output voltage channel. The
functions of these link options are described in detail in Table 3.
Table 4 shows how the links are configured.
Table 3. Channel Settings
Channel LK1 LK2
A A A
B A B
C B A
D B B
Table 4. 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.
DD
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.
Position B selects the internal voltage source 3.3 V from the ADP121 on the motherboard.
Position C selects an external supply voltage, VDD.
LK6 This link selects the VLOGIC voltage source.
Position +3V3 selects the digital voltage source from the SDP-B controller board (+3V3).
Position VLOGIC selects an external digital supply voltage, VLOGIC.
LK7 This link selects the negative DAC analog voltage source.
Position A selects VSS.
Position B selects AGND.
