Software
3. Enter a path in the
Destination File
field. You can use the folder icon to browse for the file with a
standard file dialog. If the file you enter cannot be opened or created, the record button will be
disabled. If the path points to an existing file, the file will be overwritten when you activate recording.
4. Enter the number of ADC samples to record to the file. You can enter this in time duration or number
of samples; the controls will update automatically to match. The number of samples is limited by
available memory on the MMB0 to a minimum of 2048 samples and a maximum of approximately
2,700,00 points.
5. Click the
Record
button. You will see the
Samples Retrieved
bar graph increase. When it reaches the
number of samples you selected, recording will stop and the record button will be turned off.
The data file is a comma-separated values (CSV) file containing comma-delimited decimal ADC values.
The first data column is Channel 1 followed by Channel 2. The data file can be imported into a
spreadsheet for future inspection and analysis.
4.2
Configuration
Sample rate and conversion mode are set to the same for both ADS1271 devices on the EVM.
The three ADS1271 conversion modes are selectable from the drop-down control,
Conversion Mode
.
The ADS1271 clock is generated by a PLL synthesizer on the MMB0. The synthesizer will generate a
clock/data rate that is as close as possible to the requested frequency, but the data rate may be slightly
different.
The data rate is limited for each of the possible device modes. For high-speed mode, the maximum data
rate is approximately 105kSPS. For other modes, it is approximately 52.5kSPS. The application will
automatically reduce the data rate to the maximum allowed for that mode that is selected.
7
SBAU107C – November 2004 – Revised November 2014
ADS1271EVM and ADS1271EVM-PDK User's Guide
Copyright © 2004–2014, Texas Instruments Incorporated