ADS9110EVM-PDK Operation
6.1
EVM GUI Global Settings for ADC Control
Although the EVM GUI does not allow direct access to the levels and timing configuration of the ADC
digital interface, the EVM GUI does give users high-level control over virtually all functions of the
ADS9110 including interface modes, sampling rate, and number of samples to be captured.
identifies the input parameters of the GUI (as well as their default values) through which the
various functions of the ADS9110 can be exercised. These are global settings as they persist across the
GUI tools listed in the top left pane (or from one page to another).
Figure 10. EVM GUI Global Input Parameters
The host configuration options in this pane allow the user to choose from various SPI and multiSPI host
interface options available on the ADS9110. The host always communicates with the ADS9110 using the
standard SPI protocol over the single SDI lane, irrespective of the mode selected for Data Capture.
The drop-down boxes under the Device Modes sub-menu allows the user to select the data capture mode.
The Bus Width drop-down allows selection between Single-, Dual- and Quad-SDO lanes; Data Read
between Source and System Synchronous modes and Output Data Rate between SDR and DDR modes.
Detailed descriptions of each of these modes is available in the ADS9110 datasheet (
).
The user may select SCLK Frequency and Sampling Rate on this pane and this is dependent of the
Device Mode selected. The GUI allows the user to enter the targeted values for these two parameters and
the GUI computes the best values that can be achieved, considering the timing constraints of the selected
Device Mode.
The user may specify a target SCLK frequency (in Hz) and the GUI will try to match this as closely as
possible by changing the PHI PLL settings and the achievable frequency that may differ from the target
value displayed. Similarly, the sampling rate of the ADC can be adjusted by modifying the Target
Sampling Rate argument (also in Hz). The achievable ADC sampling rate may differ from the target value,
depending on the applied SCLK frequency and selected Device Mode and the closest match achievable is
displayed. This pane therefore allows the user to try various settings available on the ADS9110 in an
iterative fashion until the user converges to the best settings for the corresponding test scenario.
The final option in this pane is the selection for the Update Mode. The default value is “Immediate” which
indicates that the interface settings selection made by the user is applied to configure both the host and
the ADS9110 instantly. “Manual” indicates that the selection made will be made only when the user
finalizes his choices and is ready to configure the device. This is described in more detail in the following
section.
16
ADS9110EVM-PDK
SBAU249 – October 2015
Copyright © 2015, Texas Instruments Incorporated