Crosstalk; Noise Performance - Measurement Computing PC-CARD DAS16AO User Manual

PC-CARD-DAS16/16AO User's Guide
Range Gain Error
±10.00 V ±3 max
±5.000 V ±3 max
±2.500 V ±3 max
±1.250 V ±3 max
These are the intrinsic specifications of the ADC. Software calibration may introduce a small
Note 1:
additional amount of linearity error.
As shown in Tab le 3 , total board error is a combination of gain, offset, differential linearity and integral
linearity error. The theoretical worst-case error of the board may be calculated by summing these component
errors. Worst case errors are realized only in the unlikely event that each of the component errors are at their
maximum level, and causing error in the same direction.
Analog input full-scale gain drift
Analog input zero drift
Overall analog input drift
Common mode range
CMRR @ 60 Hz
Input leakage current
Input impedance
Absolute maximum input voltage

Crosstalk

Crosstalk is defined here as the influence of one channel upon another when scanning two channels at the
maximum rate. A full scale 100 Hz triangle wave is input on channel 1; channel 0 is tied to analog ground at the
connector. The table below summarizes the influence of channel 1 on channel 0 with the effects of noise
removed. The residue on channel zero is described in LSB's.
Condition Crosstalk
±10.00 V 5LSB
±5.000 V 6LSB
±2.500 V 7LSB
±1.250 V 10LSB

Noise performance

Table 5 summarizes the noise performance for the PC-CARD-DAS16/16AO. Noise distribution is determined
by gathering 50K samples at 200 kHz with inputs tied to ground at the user connector.
Range % within ±2 LSBs
All ranges 78%
* RMS noise is defined as the peak-to-peak bin spread divided by 6.6.
Table 3. Calibrated accuracy specifications
Offset Error
±1.5 max
±1.5 max
±1.5 max
±1.5 max
±0.60 LSB/°C max
±0.15 LSB/°C max
±0.75 LSB/°C max
±10 V min
-76 dB min
±20 nA max
10 MOhms min
+55/-40 V (fault protected via input mux)
Table 4. Channel to channel crosstalk specifications
Per channel Rate
50 kHz
pk-pk
50 kHz
pk-pk
50 kHz
pk-pk
50 kHz
pk-pk
Table 5. Noise performance specifications
% within ±1 LSB
47%
(Note 1)
DLE
-1.0, +1.75 max
-1.0, +1.75 max
-1.0, +1.75 max
-1.0, +1.75 max
Typical LSBrms*
1.8
20
Specifications
(Note 1)
ILE
±2.0 max
±2.0 max
±2.0 max
±2.0 max
ADC Rate
100 kHz
100 kHz
100 kHz
100 kHz
Max LSBrms*
4.7