Analog Devices EVAL-AD5341DBZ, Руководство пользователя

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EVAL-AD5341DBZ User Guide UG-982
Rev. 0 | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The EVAL-AD5341DBZ evaluation board can be powered
either from the SDP-B port or externally by the J5 and J6
connectors, as described in Table 1.
The nanoDAC® EVAL-MBnanoDAC-SDZ motherboard supports
single and dual power supplies.
Both AGND and DGND inputs are provided on the EVAL-
AD5341DBZ evaluation 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 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
Various link options are incorporated in the EVAL-MBnanoDAC-
SDZ and must be set for the required operating conditions before
using the EVAL-AD5341DBZ . Table 2 describes the positions of
the links to control the EVAL-AD5341DBZ 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 to Table 4 match the evaluation board imprints (see
Figure 11).
Table 2. Link Options Setup for SDP-B Control (Default)
Link Number Position
REF1 EXT
REF2 EXT
REF3 EXT
REF4 EXT
LK5 C
LK6 +3V3
LK7 B
DAUGHTER BOARD LINK OPTIONS
The EVAL-AD5341DBZ daughter board has two link options. The
links control the settings for the reference BUF and CLR pins.
Table 3 shows how the links are configured.
Table 3. Link Options for Daughter Board
Link Number Pin Position
LK1 BUF A (unbuffered, default)
B (buffered)
LK2 CLR A (no operation, default)
B (zero scale)
Table 4. Link Functions
Link Number Function
REF1, REF2 This link selects the reference source.
Position EXT selects an off board voltage reference via the appropriate EXT_REF connector.
Position VDD selects VDD 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.
REF3, REF4 This link selects the reference source.
Position EXT selects an off board voltage reference via the appropriate EXT_REF connector.
Position VDD selects VDD 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 board.
Position B selects the internal voltage source, 3.3 V, from the ADP121 on the motherboard.
Position C selects the external supply voltage, V
DD
.
LK6 This link selects the V
LOGIC
voltage source.
Po3V3 selects the digital voltage source from the SDP-B board (3.3 V).
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.