User's Manual

GE866-DUAL Hardware User Guide
1VV0301051 Rev. 2 – 2014-04-07 7
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Reserved. Page 61 of 82
Mod. 0805 2011-07 Rev.2
12. DAC and ADC section
12.1. DAC Converter
12.1.1. Description
The GE866-QUAD provides a Digital to Analog Converter. The
signal (named DAC_OUT) is available on pin E4 of the GE866-
QUAD.
The on board DAC is a 10 bit converter, able to generate an
analogue value based on a specific input in the range from 0
up to 1023. However, an external low-pass filter is necessary
Min Max Units
Voltage range (filtered)
0
1.8
Volt
Range 0 1023 Steps
The precision is 10 bits so, if we consider that 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.
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.