Analog voltage output (usb-2408-2ao only) – Measurement Computing USB-2408 Series User Manual
Page 26
USB-2408 Series User's Guide
Specifications
26
The multiple-channel throughput rate is calculated using this formula:
Maximum throughput =
, where n is the number of channels
Table 12. Multiple-channel throughput rate specifications (Hz)
Number
of input
channels
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
1
1102.94
877.19
609.76
378.79
93.98
57.78
48.45
24.61
9.94
4.98
2.50
2
551.47
438.60
304.88
189.39
46.99
28.89
24.22
12.30
4.97
2.49
1.25
3
367.65
292.40
203.25
126.26
31.33
19.26
16.15
8.20
3.31
1.66
0.83
4
275.74
219.30
152.44
94.70
23.50
14.45
12.11
6.15
2.48
1.25
0.62
5
220.59
175.44
121.95
75.76
18.80
11.56
9.69
4.92
1.99
1.00
0.50
6
183.82
146.20
101.63
63.13
15.66
9.63
8.07
4.10
1.66
0.83
0.42
7
157.56
125.31
87.11
54.11
13.43
8.25
6.92
3.52
1.42
0.71
0.36
8
137.87
109.65
76.22
47.35
11.75
7.22
6.06
3.08
1.24
0.62
0.31
9
122.55
97.47
67.75
42.09
10.44
6.42
5.38
2.73
1.10
0.55
0.28
10
110.29
87.72
60.98
37.88
9.40
5.78
4.84
2.46
0.99
0.50
0.25
11
100.27
79.74
55.43
34.44
8.54
5.25
4.40
2.24
0.90
0.45
0.23
12
91.91
73.10
50.81
31.57
7.83
4.82
4.04
2.05
0.83
0.42
0.21
13
84.84
67.48
46.90
29.14
7.23
4.44
3.73
1.89
0.76
0.38
0.19
14
78.78
62.66
43.55
27.06
6.71
4.13
3.46
1.76
0.71
0.36
0.18
15
73.53
58.48
40.65
25.25
6.27
3.85
3.23
1.64
0.66
0.33
0.17
16
68.93
54.82
38.11
23.67
5.87
3.61
3.03
1.54
0.62
0.31
0.16
Analog voltage output (USB-2408-2AO only)
Unused AOUTx output channels should be left disconnected.
The USB-2408-2AO output voltage level defaults to 0 V whenever the host PC is reset, shut down or
suspended, or if a reset command is issued to the device.
The outputs may have a transient during startup. The duration of the output transient depends highly on the
enumeration process of the host PC. Typically, the output of the USB-2408-2AO is stable after two seconds.
Table 13. USB-2408-2AO analog voltage output specifications
Parameter
Conditions
Specifications
Digital-to-analog
converter
DAC8552
Number of channels
2
Resolution
16 bits
Output ranges
Calibrated
±10 V
Uncalibrated
±10.05 V (software-selectable)
Output transient
Host PC is reset, powered on, suspended or a reset
command is issued to device
Duration: 2 s
Amplitude: 2 V p-p
Initial power on
Duration: 50 ms
Amplitude: 5 V peak
Differential non-linearity
±0.25 LSB typ
±1 LSB max
Output current
AOUTx pins
±5.0 mA max
Output short-circuit
protection
AOUTx connected to AGND
Unlimited duration
Output coupling
DC