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Evaluation Kit User Guide
UG-041
Click Run to send this default configuration to the
MicroConverter device and to begin the conversions. The
window changes to be configured for a single primary ADC
acquisition sequence. The results of conversion are displayed in
real time. Because the channel is configured for an internal
short, ADC conversions close to 0x80000 can be expected. The
WASP performs 500 ADC conversions by default and displays
the conversion results.
Figure 19. ADC Noise Analysis Window
Click Return to Acquisition Window in the ADC Noise
Analysis window (see Figure 19) to return to the acquisition
window.
The functionality of the DAC(s) and general digital peripherals
can also be exercised via the options available from the
acquisition window.
Σ-Δ WASP
An acquisition window (see Figure 20) opens for any of the Σ-Δ
ADC MicroConverter products ( ADuC816 , ADuC824 , ADuC834 ,
ADuC836 , ADuC845 , ADuC847 , and ADuC848 ).
From this acquisitions window, you can
Figure 20. Σ-Δ Acquisitions Window, Primary ADC
When all the samples are collected, the WASP immediately
opens the ADC Noise Analysis window. This window displays
some mathematical analysis on the ADC conversions, including
rms noise (in μ V and bits) and peak-to-peak noise (in code
?
?
?
?
?
?
Select the channel on which you want to convert
Set up the ADC update rate
Select the number of samples that you want to acquire
Set up voltages on the DAC channels
Select the use of the internal reference or an external
reference device
Enable/disable various analog/digital peripherals
distribution, μ V, and bits). The most important performance
figures are highlighted in red in Figure 21.
Switch Configuration
Make sure that the external reference (2.5 V REF+) is connected
(S1.6 ON) for the ADuC845 / ADuC847 (S4.5 ON) and that AIN2
is biased to 2.5 V (S1.7 ON). For the ADuC845 / ADuC847 , read
AINCOM for AIN2 and ensure that AINCOM is biased to
2.5 V (S4.7 ON). In addition, ensure that REF? is grounded
(S1.5 ON) for the ADuC845 / ADuC847 (S4.4 ON). All other
connections should be off.
By default, the WASP enables the primary ADC to be configured
as shown in Figure 20. In this example, the primary ADC is
converting in bipolar mode using an external reference on the
2.56 V range with internally shorted input AIN2 connected to
AIN2 ( ADuC845 / ADuC847 AINCOM connected to AINCOM).
The auxiliary ADC, DAC, and current sources are all disabled.
Note that auxiliary ADC and DAC are not available on the
Figure 21. ADC Noise Analysis Window with Performance Highlights
Click Return to Acquisition Window in the ADC Noise
Analysis window to return to the acquisition window.
The functionality of the DAC(s) and general digital peripherals
can also be exercised via the options available from the
acquisition window.
ADuC847 .
Rev. B | Page 13 of 16
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