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EVM Hardware Overview
7
SBAU248 – November 2016
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Copyright © 2016, Texas Instruments Incorporated
DAC8775EVM User’s Guide
2.4.3
DVDD Supply
DVDD, the digital supply voltage, of the DAC8775 can be supplied by the SM-USB-DIG VDUT supply (pin
6 of J1), an external supply voltage through J4 (illustrated in
Figure 3
), or by the DAC8775 internal DVDD
LDO. When using the SM-USB-DIG as the DVDD supply, uninstall jumper JP13 and install jumpers JP9
and JP11. To use an external supply voltage as the DVDD supply, install jumpers JP13 and JP11 and
uninstall JP9. To use the DAC8775 internal LDO as the DVDD supply, uninstall jumpers JP9, JP13, and
JP11.
In each DVDD supply configuration, take care to ensure that digital logic thresholds of the host and
DAC8775 match and that the absolute maximum ratings of the DAC8775 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
DAC8775. Test points are provided for the !LDAC, CLR, ALARM, RESET, SDIN, SCLK, !SYNC, and SDO
pins of the DAC8775.
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 DAC8775 internal DVDD LDO or
external supplies as described in
Section 2.4.3
.