Measurement-computing PC-CARD-DAS16/330 Manual do Utilizador descarregar pdf (Página 21)

PC-CARD-DAS16/330 User's Guide Specifications

As shown in Tab , 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.

le 3

Analog input full-scale gain drift ±0.66 LSB/°C max

Analog input zero drift ±0.61 LSB/°C max

Overall analog input drift ±1.27 LSB/°C max

Input leakage current ±20 nA max

Input impedance 10 MOhms min

Absolute maximum input voltage ±30 V

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. 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.

Table 4

Table 4. Channel to channel crosstalk specifications

Condition Crosstalk Per channel rate ADC rate

All ranges 1LSB

pk-pk

165 kS/s 330 kS/s

Noise Performance

Table 5

Table 5. Noise performance specifications

summarizes the noise performance for the PC-CARD-DAS16/330. Noise distribution is determined by

gathering 50 k samples at 330 kS/s with inputs tied to ground at the user connector.

Range % within ±2 LSBs % within ±1 LSB Typical LSBrms* Max LSBrms*

All ranges 100% 90% 0.60 0.90

* RMS noise is defined as the peak-to-peak bin spread divided by 6.6.

Digital input/output

Table 6. Digital I/O specifications

Digital type FPGA

Number of I/O 8

Configuration Two ports, four bits each. Programmable as 8 input, 8 output, or 4 input

and 4 output

Input low voltage 0.8 V max

Input high voltage 2.0 V min

Output low voltage (IOL = 4 mA) 0.32 V max

Output high voltage (IOH = -4 mA) 3.86 V min

Absolute maximum input voltage -0.5 V , +5.5 V

Power-up / reset state Input mode (high impedance)

1 2 ... 16 17 18 19 20 21 22 23 24 25 26

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