EVM Hardware Overview
3.4
Connecting the USB Cable to the SM-USB-DIG Platform
shows the typical response to connecting the SM-USB-DIG Platform board to a USB port for the
first time. Typically, the PC responds with a
Found New Hardware, USB Device
pop-up dialog window.
The pop-up window then changes to
Found New Hardware, USB Human Interface Device
. This pop-up
indicates that the device is ready to be used. The SM-USB-DIG Platform uses the human interface device
drivers that are included in the Microsoft
®
Windows
®
operating system (OS).
In some cases, the
Add Hardware Wizard
appears. If this prompt occurs, allow the system device
manager to install the human interface drivers by clicking
Yes
when requested to install drivers.
Figure 5. Confirmation of SM-USB-DIG Platform Driver Installation
3.5
Powering the EVM
This section describes the various power configurations that can be used by the EVM.
3.5.1
AVDD and AVSS Power Configurations
Terminal block J2 allows for external voltage sources to be connected to the AVDD and AVSS supply rails
of the DACx760. Note that the DACx750 devices feature only AVDD supplies. The DACx760EMC-EVM
only requires an AVSS supply if the DACx760 is used in ±5 V or ±10 V mode. If bipolar output is not
required, jumper JP1 can be shunted to connect AVSS to GND, or GND may be connected at J2. AVDD
and AVSS are protected to the datasheet absolute maximum potentials by transient-voltage-suppression
(TVS) diodes D2, D3, and D5.
3.5.2
DVDD Power Configurations
Terminal block J1 allows for an external voltage source to be connected to the DVDD pin of the DACx760
or DACx750. The EVM receives power from the SM-USB-DIG Platform when JP9 is installed. An external
power source can be used when JP9 is removed and JP3 is installed. Note that if an external DVDD is
used, it must be set to the same voltage as the SM-USB-DIG Platform for successful SPI communication
alongside the SM-USB-DIG. The DVDD input is protected to the datasheet absolute maximum input by
D1.
The DACx760 and DACx750 feature internal regulators that can be used to provide DVDD supplies. By
removing JP3, the DACx760 or DACx750 provide the DVDD supply. In this configuration, JP9 must be
removed and no external supply can be connected.
7
SBAU229 – April 2014
DACx760EMC-EVM
Copyright © 2014, Texas Instruments Incorporated
