User's Manual

CL865-DUAL Hardware User Guide
1vv0301104 Rev.1 – 2014-03-07
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Reserved. Page 53 of 70
Mod. 0805 2011-07 Rev.2
12. DAC and ADC Section
12.1. DAC converter
12.1.1. Description
The CL865 module provides a Digital to Analog Converter. The signal (named DAC_OUT)
is available on pin 15 of the CL865 module.
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 1.8V, the integrated voltage
could be calculated with the following formula:
Integrated output voltage = 1.8 * value / 1023
DAC_OUT line must be integrated (for example with a low band pass filter) in order to obtain
an analog voltage.
12.1.2. 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.