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FIBOCOM MC610 Series Hardware Guide
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Table 3-18 ADC precision
Voltage Range (V)
Precision (mV)
0-1.1
3
1.2-3.3
40
3.3-VBAT
10
In case of higher requirements for precision, it is recommended to use a lower voltage range.
It is recommended that the ADC should be surrounded with grounding lines, so as to improve the
precision of ADC voltage measurement;
When using the ADC, a 1 K resistor must be connected in series.
3.10 Analog Audio Interface
The module has a built-in audio encoding and decoding chip, provides an analog audio output channel,
and supports calls and playback and other functions. Users can connect SPK directly to the periphery of
the module, or choose to add an audio power amplifier.
3.10.1 Audio Interface Pin Definition
Table 3-19 SPK pin
Pin Name
I/O
Pin
Description
SPK_P
O
35
Loudspeaker output positive
SPK_N
O
36
Loudspeaker output negative
SPK_P and SPK_N channels are used for the differential output of the handset or speaker (requiring an
external audio power amplifier) and do not support single-ended output.
SPK supports Class-D and CLASS-AB output modes, Class-D mode gain level is 0/1.5/3 dB, and
Class-AB mode gain level is -3/0/1.16 dB (3-bit programmable gain).
Note:
