Measurement Computing CIO-DAS801 - Manual (Page 18)

18
Chapter 4
Specifications
All specifications are subject to change without notice.
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 AD674A, successive approximation
Resolution 12-bits
Number of channels 8
Input ranges ±10 V, ±5 V , ±1 V, ±0.5 V , ±0.1 V, ±0.05 V, ±0.01 V , ±0.005 V,
0 to 10 V, 0 to 1 V, 0 to 0.1 V, 0 to 0.01 V, fully programmable
Polarity Unipolar/Bipolar programmable
A/D pacing Programmable: internal counter or external source (IR Input / XCLK, falling
edge) or software polled
A/D trigger sources External hardware (DIN1 / Trig, rising edge)
Data transfer Interrupt or software polled from 256 sample FIFO buffer
Channel configuration Differential (or pseudo-differential with installation of a SIP resistor) or
single-ended, switch selectable for each channel
DMA None
A/D conversion time 20 µs
Throughput 50 kHz
Accuracy ±0.01% of full scale ±1 LSB typ, ±0.05% of full scale ±1 LSB max
Differential linearity error ±0.5 LSB max
Integral linearity error ±1 LSB
No missing codes (guaranteed) 12-bits
Gain drift (A/D specs) ±50 ppm/°C
Zero drift (A/D specs) ±10 ppm/°C
Common mode range ±10 V
CMRR @ 60 Hz Gain = 1 70 dB min
Gain = 10 90 dB min
Gain ≥ 100 100 dB min
Input leakage current (@ 25 C) ± 30 nA
Input leakage current (over temperature) ±250 nA
Input impedance >1 Gohm typical
Absolute maximum input voltage ±35 V
Noise distribution (results presented as Average % ±2 bins, Average % ±1 bin, Average # bins):
Bipolar 10 V, 5 V, 1 V 100% / 100% / 3 bins
0.5 V, 0.1 V 100% / 99.3% / 4 bins
0.05 V 100% / 99.1% / 5 bins
0.01 V 95.2% / 79.8% / 11 bins
0.005 V 72% / 48.3% / 21 bins