UG-1634
Rev. 0 | Page 3 of 15
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The EV-AD74412RSDZ comes with a single power supply
connector that provides power directly to the AVDD pin of the
. Set this supply as described in the
data
sheet.
The AVDD supply on the EV-AD74412RSDZ powers an on-
board regulator (
), which generates a 5 V supply to the
EV-AD74412RSDZ (see Figure 2). The 5 V supply can be used
for the following purposes:
Power a 2.5 V external reference (
can be used as an alternative to the
on-chip reference.
Power a 3.3 V regulator (
). The 3.3 V from the
regulator powers the DVCC and IOVDD supplies of the
Figure 2 shows a simplified drawing of the power connections
on the EV-AD74412RSDZ.
REFERENCE OPTIONS
By default, the EV-AD74412RSDZ is configured to use the
on-chip reference by shorting the REFOUT pin to
the REFIN pin. There is also an external reference option
available on the EV-AD74412RSDZ. The
can be used
instead of the internal reference. The appropriate jumpers must
be connected if using the external reference. See Table 1 for the
specific link options and functions.
OUTPUT CHANNELS
The four channels of the
are configured as described
in the
data sheet. Figure 13 shows the schematic
details for all four channels.
There are four channel screw terminal connectors on the EV-
AD74412RSDZ. These terminals (CH_A, CH_B, CH_C, and
CH_D) are used to connect the desired loads to the four
channels of the
SPI COMMUNICATION
board handles the communication to the EV-
AD74412RSDZ via the PC. By default, the
board controls
the SPI communication, controls the RESET pin (driven high)
and LDAC pin (driven low), and monitors the ALERT pin,
ADC_RDY pin, and the GPO_x pins of the
A reset button (S1) is also available on the EV-AD74412RSDZ.
The EV-AD74412RSDZ supports the use of an Arduino® board
(such as the
) when connected to the
headers provided. See Table 1 for the necessary links to the
Arduino header.
TEST POINTS
Multiple test points are available on the EV-AD74412RSDZ.
Debug access is available for all pins on the
and on
the four channel screw terminals. The test points are located
adjacent to the relevant pins on the
LINK CONFIGURATION OPTIONS
The JPx and Px jumpers must be set properly for operation of
the EV-AD74412RSDZ before using the EV-AD74412RSDZ. The
functions and default states of these options are listed in Table 1.
Before applying power and signals to the EV-AD74412RSDZ,
ensure that all links are set to the default positions, as defined in
Table 1.
REFOUT
REFIN
DVCC
AVDD
IOVDD
5V
3.3V
EXTERNAL
REFERENCE (2.5V)
SUPPLY CONNECTOR
14V TO 26.4V
ADP2360
ADP1720
AD74412R
ADR4525
2141
3-
00
2
Figure 2. EV-AD74412RSDZ Simplified Power Diagram
