User's Manual

Table Of Contents

GC864 Hardware User Guide

1vv0300733 Rev.12 – 2009-06-04

12. DAC and ADC Section

12.1. DAC Converter

12.1.1. Description

The GC864-QUAD / PY module provides a Digital to Analog Converter. The signal

(named DAC_OUT) is available on pin 40 of the GC864-QUAD / PY module and on pin

17 of PL102 on EVK2 Board (CS1203).

The on board DAC is a 10-bit converter, able to generate a analogue value based 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 2,6 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

The AT command below is available to use the DAC function:

AT#DAC[=<enable>[,<value>]]

<value> – scale factor of the integrated output voltage (0–1023, with 10 bit precision),

and it must be present if <enable>=1.

Refer to SW User Guide or AT Commands Reference Guide for the full description of

this function.

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.