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Input / Output 4-9MN1921
4.4 Analog I/O
The NextMove ST provides:
H Two 12-bit resolution analog inputs.
H One 0-11V analog output.
4.4.1 Analog inputs
H Differential inputs.
H Voltage range: ±10V.
H Resolution: 12-bit with sign (accuracy ±4.9mV @ ±10V input).
H Input impedance: 120kΩ.
H Sampling frequency: 4kHz maximum, 2kHz if both inputs are enabled.
The analog inputs pass through a differential buffer and second order Butterworth filter with a
cut-off frequency of approximately 1kHz.
Both inputs are normally sampled at 2kHz. However , an input can be disabled by setting
ADCMODE to4(_acOFF). With one input disabled, the remaining input will be sampled at 4kHz.
In MintMT, analog inputs can be read using the ADC keyword. See the MintMT help file for full
details of ADC and ADCMODE.
NextMoveST
-
+
AIN0+
AIN0-
AGND
MintMT
ADC.0
-
+
120k
120k
15k
10k 10k
22nF
10nF
100pF100pF
3
2
6
Figure 10 - Analog input, AIN0 shown
For differential inputs connect input lines to AIN+ and AIN-. Leave AGND unconnected.