Copyright © 2016, Texas Instruments Incorporated
DAC8775
PVDD/AVDD
Power Supply
VOUT
A
IOUT
A
VOUT
D
IOUT
D
...
...
HARTIN
X
IEC
6
1
0
0
0
-4
Pro
te
ct
io
n
C
ircu
it
Pl
a
ce
h
o
ld
e
r
External Supplies
SM-USB-DIG
VPOS
X
/VNEG
X
In
te
rn
a
l
Bu
ck
-Bo
o
st
External V
REF
REF5050
In
te
rn
a
l V
R
EF
V
REF
SPI
Computer
SM-USB-DIG
Platform
DAC8775EVM
Power Supply
USB
10-Pin Connector
Single-supply for use with buck-boost converter
Multi-supply for use without buck-boost converter
www.ti.com
EVM Hardware Overview
3
SBAU248 – November 2016
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Copyright © 2016, Texas Instruments Incorporated
DAC8775EVM User’s Guide
2
EVM Hardware Overview
This section discusses the overall system setup for the EVM. A personal computer (PC) runs the software
that communicates with the SM-USB-DIG platform, which provides the power and digital signals used to
communicate with the EVM board. Connectors on the EVM board allow the user to connect the required
external power supplies for the configuration under test. The SM-USB-DIG must be connected to the
DAC8775EVM with the Texas Instruments logo facing up.
Figure 1. DAC8775EVM Hardware Setup
2.1
EVM Board Block Diagram
A block diagram of the EVM board setup is shown in
Figure 2
. This board provides test points for the SPI,
power, reference, ground, analog outputs, !LDAC, CLR, ALARM, and RESET signals. The EVM allows the
user to select the internal buck-boost converter or external power supplies as sources for each channel’s
positive and negative supplies rails. The EVM also allows the user to select the internal reference,
onboard REF5050 reference, or external reference to provide the reference voltage to the DAC8775.
Figure 2. DAC8775EVM Block Diagram