BTH-1208LS User's Guide
Specifications
21
Note 2:
Input current is a function of applied voltage on the analog input channels. For a given input
voltage, V
in
, the input leakage is approximately equal to (8.181 * V
in
– 12) µA.
Note 3:
Maximum throughput when scanning is machine dependent.
Note 4:
The AD7870 converter only returns 11 bits (0 to 2,047 codes) in single-ended mode.
Accuracy
Table 2. Accuracy, differential mode
Range
Accuracy (LSB)
±20 V
5.1
±10 V
6.1
±5 V
8.1
±4 V
9.1
±2.5 V
12.1
±2 V
14.1
±1.25 V
20.1
±1 V
24.1
Table 3. Accuracy, single-ended mode
Range
Accuracy (LSB)
±10 V
4.0
Table 4. Accuracy components, differential mode – all values are (±)
Range
% of Reading
Gain Error at FS (mV)
Offset (mV)
Accuracy at FS (mV)
±20 V
0.2
40
9.766
49.766
±10 V
0.2
20
9.766
29.766
±5 V
0.2
10
9.766
19.766
±4 V
0.2
8
9.766
17.766
±2.5 V
0.2
5
9.766
14.766
±2 V
0.2
4
9.766
13.766
±1.25 V
0.2
2.5
9.766
12.266
±1 V
0.2
2
9.766
11.766
Table 5. Accuracy components, single-ended mode – all values are (±)
Range
% of Reading
Gain Error at FS (mV)
Offset (mV)
Accuracy at FS (mV)
±10 V
0.2
20
19.531
39.531
Noise performance
Table 6. Noise performance, differential mode
Range
Typical counts
LSB
rms
±20 V
3
0.45
±10 V
3
0.45
±5 V
3
0.45
±4 V
4
0.61
±2.5 V
5
0.76
±2 V
7
1.06
±1.25 V
10
1.52
±1 V
12
1.82
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