PDK Kit Operation
Step 5.
When the plug-in is loaded, the plug-in searches for the board. A series of messages in the
status area indicates this action, eventually displaying
Connected to EVM
.
Step 6.
Change the device name from ADS8861 to ADS8860.
The plug-in is now loaded and ready to function with the ADS8860EVM.
8.3
Using the ADS8860EVM Plug-in
The ADS8860EVM allows the user to evaluate the ADS8860 ADC.
shows the device
configuration tab of the ADS8860EVM plug-in that is used to change acquisition parameters, such as
sample rate and voltage reference.
Figure 10. ADS8860EVM Plug-in: Device Configuration Tab
The device configuration tab contains the following controls:
1.
Data rate:
By default, data rate is at 1 MSPS. This control shows the data rate or sampling frequency
used by the ADC to acquire data. With an SCLK frequency of 80 MHz, data rate can be set to a value
from 19.536 kSPS to 1 MSPS. With an SCLK frequency of 10 MHz, data rate can be set to a value
from 4 kSPS to 344.827 kSPS.
2.
SCLK:
By default, SCLK is at 80 MHz. SCLK sets the clock frequency used by the SPI interface to
capture data. SCLK should be a value between 70 MHz to 80 MHz for 1 MSPS. For slow sampling
rates, use 10 MHz. Do not use SCLK frequencies between 30 MHz and 50 MHz.
3.
Reference:
4.5 V is the default reference value, which matches the onboard reference of the EVM.
The value of this control should always match the reference used by the ADC to read accurate
voltages.
4.
Device selection:
ADS8861 is the default device selected. Therefore, this value must be changed to
ADS8860 in order to match the ADS8860EVM.
5.
About:
This control shows the plug-in version, MMB0 firmware version, assembly date, and board
revision information. Note that the device name is ADS8881 because the software is based on the
ADS8881EVM.
6.
Collection bar:
This feature shows the percentage of data collected during an acquisition session.
12
ADS8860EVM-PDK
SBAU213 – September 2013
Copyright © 2013, Texas Instruments Incorporated