Measurement Computing CIO-DAS08 - Manual (Page 17)

Chapter 4
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
Parameter Specification
A/D converter type
AD574
Resolution 12-bits
Number of channels
8 single-ended
Input ranges ±10 V, ±5 V, 0 to +10 V, switch selectable
Polarity Unipolar/Bipolar, switch selectable
A/D pacing Software polled (typically through ISR paced by on-board counter)
A/D trigger sources External polled digital input trigger (Digital In 1)
Data transfer Software polled (typically through ISR paced by on-board counter)
DMA None
A/D conversion time
25 µs
Throughput 20 kHz, PC dependent
Accuracy ±0.01% of reading ±1 LSB
Differential linearity error ±1 LSB
Integral linearity error ±0.5 LSB
No missing codes guaranteed 12-bits
Gain drift (A/D specs) ±25 ppm/°C
Zero drift (A/D specs) ±10 µV/°C
Common Mode Range ±10 V
CMRR 72 dB
Input leakage current (@ 25 °C) 100 nA
Input impedance 10 Meg Ohms min
Absolute maximum input voltage ±35 V
Avg % ± 2 bins Avg % ± 1 bin Avg # bins
Bipolar (10 V) 100% 100% 3 bins
Bipolar (5 V) 100% 100% 3 bins
Noise Distribution (Rate = 1 to 20 kHz)
Unipolar (10 V) 100% 100% 3 bins
Digital Input / Output
Table 2. Digital input/output specifications (main connector – J1)
Digital type (main connector J1) Output: 74LS273
Input: 74LS244
Configuration 4 fixed output bits, 3 fixed input bits
Number of channels 4 out, 3 in
Output high 2.7 volts min @ -0.4 mA
Output low 0.4 volts max @ 8 mA
Input high 2.0 volts min, 7 volts absolute max
Input low 0.8 volts max, -0.5 volts absolute min
Output power-up / reset state
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