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Table 2: Example of Per Channel Sampling Frequency
Number of
Input
Channels
600
1
600.00
2
300.00
3
200.00
4
150.00
5
120.00
6
100.00
7
85.71
8
75.00
Input Trigger
The DT9828 modules support a software trigger event to start the analog input operation. A
software trigger occurs when you start the analog input operation (the computer issues a
write to the module to begin conversions). Using software, specify the trigger source as a
software trigger.
Analog Input Conversion Modes
DT9828 modules support single-value and continuous scan conversion modes. This section
describes each of these conversion modes.
Single-Value Operations
Single-value operations are simpler to use than continuous operations. Using software, you
specify the analog input channel that you want to use. For the DT9828, specify channel 0, 1, 2,
3, 4, 5, 6, or 7. The module acquires the data from the specified channel and returns the data
immediately.
For single-value operations, you cannot specify a clock frequency, trigger source, scan mode,
or buffer. Single-value operations stop automatically when finished; you cannot stop a
single-value operation.
Total Throughput (Hz)
300
200
120
300.00
200.00
120.00
150.00
100.00
60.00
100.00
66.67
40.00
75.00
50.00
30.00
60.00
40.00
24.00
50.00
33.33
20.00
42.86
28.57
17.14
37.50
25.00
15.00
100
60
40
100.00
60.00
40.00
50.00
30.00
20.00
33.33
20.00
13.33
25.00
15.00
10.00
20.00
12.00
8.00
16.67
10.00
6.67
14.29
8.57
5.71
12.50
7.50
5.00
Principles of Operation
10
6
1
10.00
6.00
1.00
5.00
3.00
0.50
3.33
2.00
0.33
2.50
1.50
0.25
2.00
1.20
0.20
1.67
1.00
0.17
1.43
0.86
0.14
1.25
0.75
0.13
63
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