MTX-DIN Family
www.mtxm2m.com
2015/10 v2.3
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MTX M2M® by MATRIX ELECTRONICA S.L.U
4.2.7.1
2G models
The ADC of the MTX-DIN-2G consists of 2 independent, unbalanced, multiplexed analog inputs that
can be used for measuring external DC voltages in the range of 0mV…+2400mV. The ADC has a
resolution of 12 bits.
Use the command AT^SRADC to select the analog inputs ADC1_IN or ADC2_IN, to set the
measurement mode and read out the measurement results. The measured values are indicated in
mV.
There is no out of range detection. Voltages beyond these limits cannot be measured:
•
Underflow: Values ≤ -25mV
•
Overflow: Values > 2425mV
The sample period is adjustable from 30s up to 100ms by AT^SRADC. Only during sample time
(ts~400μs) is the S&H switch closed.
The DAC of the MTX-DIN-2G consists of one independent and unbalanced PWM digital output that
can be used to generate signals in the range of 0mV...3000mV.
Use the command AT^SWDAC to set the PWM frequency and the duty cycle. You can use the
following values of frequency: 320, 970, 8125, 16250, 32500 or 65000Hz; it is also possible to set the
duty cycle in percentage steps between 0 and 100%.
You can use an external filter (such as a simple RC filter) to smooth the PWM signal and obtain the
baseband signal.
