Digital Interface
4
Digital Interface
The ADS7041 digital output is available in SPI-compatible format, which makes interfacing with
microprocessors, digital signal processors (DSPs) and FPGAs easy. The ADS7041EVM offers 50-
Ω
resistors between the SPI signals and edge connector J1 to aid with signal integrity. Typically, in high-
speed SPI communication, fast signal edges can cause overshoot; these resistors slow down the signal
edges in order to minimize signal overshoot.
The ADS7041EVM has clearly marked test points for all the SPI signals to allow observation of the
interface signals using an oscilloscope.
5
ADS7041EVM-PDK Initial Setup
This section presents the steps required to set up the ADS7041EVM-PDK kit before operation.
5.1
Default Jumper Settings
A silkscreen plot detailing the default jumper settings is shown in
explains the configuration for these jumpers.
Figure 2. ADS7041EVM Default Jumper Settings
Table 5. Default Jumper Configurations
Reference
Default
Description
Designator
Position
P2
Open
Alternate location for the analog input to the ADS7041EVM (unassembled by default)
P3
Closed
Closed to connect onboard 3.3-V supply directly to AVDD of the ADS7041
P4
Open
Unassembled, by default
5.2
Software Installation
This section presents the steps required to the install the software.
explains how to operate the
software to acquire data.
NOTE:
Ensure the microSD memory card included in the kit is installed in the microSD socket (P6)
on the back of the Simple Capture Card as well as the microSD socket (J2) before
connecting the EVM to the PC. Also ensure that the cards are not swapped or overwritten. If
the contents of these cards are not available during boot up, Windows will not recognize the
ADS7041EVM-PDK as a connected device.
5
SBAU239 – November 2014
ADS7041EVM-PDK
Copyright © 2014, Texas Instruments Incorporated
