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FIBOCOM MC610 Series Hardware Guide
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SPK output power: 800 mW @ 4.2 V on 8 Ω load in Class-D mode, 600 mW @ 4.2 V on 8 Ω load in
Class-AB mode.
The default power amplifier of the module is Class-AB output. When an external power amplifier is
required, the recommended model is: AW87359FCR (2 W @ 8 Ω).
Table 3-20 SPK pins
HP_R
O
33
Earphone right channel signal
HP_L
O
34
Earphone left channel signal
Module earphone output power: 25 mW @ ± 1.8 V on 32 Ohm load, gain range: -18 dB to + 0 dB with 3
dB steps (4-bit programmable gain).
Table 3-21 MIC pins
HEADMIC_P
I
99
Earphone MIC input positive
HEADMIC_N
I
100
Earphone MIC input negative
HEADMIC_BIAS
PO
81
Bias voltage of earphone MIC
MIC_P
I
29
MIC input positive
MIC_N
I
28
MIC input negative
MIC_BIAS
PO
30
MIC bias voltage
8 levels of gain amplification within MIC input are adjustable, range: 0 dB to +36 dB (3-bit programmable
gain, 0/3/6/12/18/24/30/36 dB).
3.10.2 Preventing TDD and Other Noises
Handheld microphones and hands-free microphones are recommended to adopt built-in RF filter
dual-capacitance (such as 10 pF and 33 pF) electret microphones to filter out RF interference from the
source of interference, which will greatly improve the coupling TDD noise. 33 pF capacitor is used to filter
high frequency interference when the module is working at 900 MHz, and 10 pF capacitor is used to filter
high frequency interference when working at 1,800 MHz. If the capacitor is not added, TDD noise may be
