User's Manual

DE910 Series Hardware User Guide
1vv0300951 Rev.9 – 2015-05-11
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 58 of 77
11. DAC and ADC section
11.1. DAC Converter
11.1.1. Description
The DE910 module provides a Digital to Analog Converter. The signal (named DAC_OUT)
is available on pin C13 of the DE910 module and on pin 6 of PL302 on Interface Board
(CS1467D).
The on board DAC is in the range from 0 to 1023. However, an external low-pass filter is
necessary.
Parameter Min Max Units
Voltage range (filtered)
0 1.8 Volt
Range
0 1023 Steps
The precision is 1023 steps, so since the maximum voltage is 2V, the integrated voltage could
be calculated with the following formula:
Integrated output voltage = 2 * value / 1023
DAC_OUT line must be integrated (for example with a low band pass filter) in order to obtain
an analog voltage.
11.1.2. Enabling DAC
An AT command is available to use the DAC function.
The command is: AT#DAC[=<enable>[,<value>]]
<value> - scale factor of the integrated output voltage (0..1023 ~ 10 bit precision)
it must be present if <enable>=1
Refer to SW User Guide or AT Commands Reference Guide for the full description of this
function.
NOTE:
The DAC frequency is selected internally. D/A converter must not be used during
POWERSAVING.