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USB-1408FS User's Guide
Note 2:
Maximum throughput scanning to PC memory is machine dependent. The rates specified are for
Windows XP only. Maximum rates on operating systems that predate XP may be less and must
be determined through testing on your machine
Note 3:
The ADS7871 converter only returns 13-bits (0 to 8192 codes) in single-ended mode.
Note 4:
Extrapolating the long term drift accuracy specifications will provide the approximate long term
drift of the USB-1408FS intermediate input ranges.
Range
Absolute Accuracy 25°C (±mV)
±20 V
10.98
±10 V
7.32
±5 V
3.66
±4 V
2.92
±2.5 V
1.83
±2 V
1.70
±1.25 V
1.21
±1 V
1.09
Range
Absolute Accuracy 25°C (±mV)
±10 V
10.98
Range
Typical counts
±20 V
8
±10 V
8
±5 V
9
±4 V
10
±2.5 V
12
±2 V
14
±1.25 V
18
±1 V
22
Range
Typical Counts
±10 V
8.0
Table 2. Accuracy, differential mode
Absolute Accuracy 0 to 50°C (±mV)
49.08
33.42
20.76
19.02
14.97
14.29
12.18
11.63
Table 3. Accuracy, single-ended mode
Absolute Accuracy 0 to 50°C (±mV)
49.08
Table 4. Noise performance, differential mode
Least significant bit
1.21
1.21
1.36
1.51
1.81
2.12
2.72
3.33
Table 5. Noise performance, single-ended mode
LSB
1.21
27
root mean square
rms
Specifications
(LSB
rms)
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