A User's Manual

UMDAS 0802DA User's Guide Specifications

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 2:

Note 3:

Note 4:

The ADS7871 converter only returns 13-bits (0 to 8192 codes) in single-ended mode.

Extrapolating the long term drift accuracy specifications will provide the approximate long term

drift of the UMDAS 0802DA intermediate input ranges.

Table 4-2. Accuracy, differential mode

Range Absolute Accuracy 25°C (±mV) Absolute Accuracy 0 to 50°C (±mV)

±20 V 10.98 49.08

±10 V 7.32 33.42

±5 V 3.66 20.76

±4 V 2.92 19.02

±2.5 V 1.83 14.97

±2 V 1.70 14.29

±1.25 V 1.21 12.18

±1 V 1.09 11.63

Table 4-3. Accuracy, single-ended mode

Range Absolute Accuracy 25°C (±mV) Absolute Accuracy 0 to 50°C (±mV)

±10 V 10.98 49.08

Table 4-4. Noise performance, differential mode

Range Typical counts Least significant bit

root mean square

(LSB

rms)

±20 V 8 1.21

±10 V 8 1.21

±5 V 9 1.36

±4 V 10 1.51

±2.5 V 12 1.81

±2 V 14 2.12

±1.25 V 18 2.72

±1 V 22 3.33

Table 4-5. Noise performance, single-ended mode

Range Typical Counts LSB

rms

±10 V 8.0 1.21

4-2