SIM800C datasheet(30/52 Pages) SIMCOM

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SIM800C_Hardware_Design_V1.02

2015-4-27

In order to improve audio performance, the following reference circuits are recommended. The audio signals

have to be layout according to differential signal layout rules as shown in following figures.

4.7.1.

Speaker Interfaces Configuration

SP KP

Close to speaker

ES D

ESD

10pF

33pF

M odule

S PKN

10pF

33pF

10pF

Figure 28: Speaker reference circuit

4.7.2.

Microphone Interfaces Configuration

Electret

Microphone

The lines in bold type should

be accorded to differential

signal layout rules

These components should

be placed to microphone

as close as possible

MIC P

M odule

MIC N

ESD

10pF

33pF

10pF

Figure 29: Microphone reference circuit

4.7.3.

Audio Electronic Characteristic

Table 13: Microphone input characteristics

Parameter

Min

Typ

Max

Unit

Microphone biasing voltage

1.9

2.2

Working current

2.0

Input impedance(differential)

KΩ

Idle channel noise

-67

dBm0

SINAD

Input level:-40dBm0

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