ADS8168EVM-PDK Operation
16
SBAU291 – November 2017
Copyright © 2017, Texas Instruments Incorporated
ADS8168EVM-PDK
6.1
EVM GUI Global Settings for ADC Control
Although the EVM GUI does not allow direct access to the voltage levels and timing configuration of the
ADC digital interface, the EVM GUI provide users high-level control over the various interface modes and
frequencies of the ADS8168, as well as the capture and multiplexer sequencing options. In addition, the
EVM GUI provides full low-level control of all register settings.
shows the
Device Configuration
page, through which various functions of the ADS8168 are
exercised. These are global settings, and they persist across the different GUI tools or GUI pages listed in
the top left plane. The software defaults to operating the ADS8168 in
Manual Mode
, sampling Channel 0
at 1 MSPS. The digital interface defaults to operating the SCLK at 15 MHz.
Figure 12. EVM GUI Global Input Parameters
Independent of the interface configuration, the user can specify a target SCLK frequency and sampling
frequency (in Hz) and the GUI tries to match this frequency as closely as possible by changing the PHI
PLL settings. The achievable frequencies can differ from the target value displayed. Achievable
frequencies are limited by the various interface modes, and the ADS8168 provide options which allow a
very low SCLK. This pane allows the user to try various settings available on the ADS8168 in an iterative
fashion until the user converges to the best settings for the corresponding test scenario.
The
Device Reset
button in the GUI functions as a Master RESET to both the ADS8168 EVM and the
GUI. When the button is pressed, the ADC RESETs to the default settings shown in
