EVM Hardware Overview
6
SLAU727 – August 2017
Copyright © 2017, Texas Instruments Incorporated
DAC8771 Evaluation Module
2.4.3
DVDD Supply
DVDD, the digital supply voltage, of the DAC8771 can be supplied by the SM-USB-DIG VDUT supply (pin
6 of J1), an external supply voltage through J5 (illustrated in
), or by the DAC8771 internal DVDD
LDO. When using the SM-USB-DIG as the DVDD supply, uninstall jumper JP10 and install jumpers JP15
and JP15. To use an external supply voltage as the DVDD supply, install jumpers JP10 and JP15 and
uninstall JP16. To use the DAC8771 internal LDO as the DVDD supply, uninstall jumpers JP10, JP15, and
JP16.
In each DVDD supply configuration, take care to ensure that digital logic thresholds of the host and
DAC8771 match and that the absolute maximum ratings of the DAC8771 are not violated.
2.5
EVM Features
This section describes some of the hardware features present on the EVM board.
2.5.1
Communication Test Points
The EVM board features test points for monitoring the communication between the SM-USB-DIG and the
DAC8771. Header J2 provide test points for the LDAC, ALARM, CLR, RESET, SDIN, SCLK, SYNC, and
SDO pins of the DAC8771.
Figure 4. Digital Communication Test Points
The EVM design also allows external signals to be connected through these communication test points if
the EVM is integrated into a custom evaluation setup or application-specific prototype. Note that if the SM-
USB-DIG platform is not used, DVDD must be configured to use the DAC8771 internal DVDD LDO or
external supplies as described in
.
