Measurement Computing CIO-DAS1401/12 - Manual (Page 16)

16
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 ADS7805 successive approximation
Resolution 12 bits (1 in 4096)
Programmable ranges ±10 V, ±1 V, ±0.1 V, ±0.01 V, 0 to 10 V, 0 to 1 V, 0 to 0.1 V, 0 to 0.01 V
A/D pacing Programmable: external source (DIN0, positive edge), internal pacer
(positive or negative edge, jumper selectable) or software polled
Burst mode 4 µs
Data transfer From 512 sample FIFO via interrupt, DMA or software polled
Polarity Unipolar/Bipolar, switch selectable
Number of channels 8 differential or 16 single-ended, switch selectable
DMA Channel 1 or 3
Trigger sources External polled gate trigger (DIN0)
A/D conversion time 3.3 µs
Throughput 160 kS/s
Differential linearity error ±1 LSB
Integral linearity error ±1.5 LSB
No missing codes guaranteed 12 bits
Gain drift (A/D specs) ±30 ppm/°C
Zero drift (A/D specs) ±10 ppm/°C
Input leakage current 250 nA max
Input impedance 10 Meg Ohms min
Absolute maximum input voltage ±35 V
Digital input/output
Table 2. Digital I/O specifications
Digital type Output: 74LS197
Input:
74LS244
Configuration 4 fixed input, 4 fixed output
Number of channels 8
Output high 2.7 volts min @ -0.4 mA
Output low 0.5 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
Interrupts 2-7
Interrupt enable Programmable
Interrupt sources End-of-conversion, DMA terminal count