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M12 Hardware Design

M12_HD_V3.3 - 49 -

Module

SPK2P

AGND

Differential layout

Amplifier

circuit

10pF

0603

Close to speaker

GND

ESD

33pF

0603

33pF

0603

GND

10pF

0603

ESD

Figure 31: Reference design with an amplifier for AOUT2

Note: The value of C1 and C2 depends on the input impedance of audio amplifier.

3.9.4. Earphone interface configuration

Amphenol

9001-8905-050

SPK2P

MIC2N

MIC2P

22uF

68R

AGND

Close to Socket

Differential

layout

AGND

Module

4.7uF

ESD

GND

33pF

0603

10pF

0603

33pF

0603

GND

10pF

0603

ESD

Figure 32: Reference design for an earphone

Table 11: Typical electret microphone characteristic

Parameter

Min

Typ

Max

Unit

Working Voltage

1.2

1.5

2.0

Working Current

200

500

External Microphone Load Resistance

2.2

k Ohm

Quectel

Confidential

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 75 76

Quectel Cellular Engine 1
Confidential 10

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