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4.2 Analog I/O
The NextMove ESB provides:
Two 12-bit resolution analog inputs.
H
Four 12-bit resolution analog outputs.
H
4.2.1 Analog inputs
The analog inputs are available on connector X12, pins 1 & 2 (AIN0) and 4 & 5 (AIN1).
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.
H
The analog inputs pass through a differential buffer and second order low-pass 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 to 4 (_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, ADCMODE and other related ADC... keywords.
NextMove ESB
'X12'
AIN0-
2
AIN0+
1
3
AGND
For differential inputs connect input lines to AIN+ and AIN-. Leave AGND unconnected.
MN1924
15k
+12V
120k
-
+
120k
-12V
Figure 2 - Analog input, AIN0 shown
22nF
-
10k
10k
+
10nF
www.supportme.net
MintMT
ADC.0
Input / Output 4-3
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