Specifications

Smart Machine Smart Decision
SIM5800_Hardware Design_V1.01 38 2018-10-08
4.12.4 Speaker Interface
The module is integrated with a Class-D audio amplifier. Parameters are shown in the following table:
Table 15: Performance parameters of the speaker
Parameters
Test Condition
Min
Typ
Max
Unit
Power
8 Ω load, VBAT= 4.2 V THD+N=1%
900
-
mW
8 Ω load, VBAT= 3.8 V THD+N=1%
700
-
mW
8 Ω load, VBAT= 3.4 V THD+N=1%
500
-
mW
8 Ω load, VBAT= 4.2 V THD+N=10%
1100
mW
8 Ω load, VBAT= 3.8 V THD+N=10%
850
mW
8 Ω load, VBAT= 3.4 V THD+N=10%
600
-
mW
THD+N
(1 kHz)
Pout=0.5Wrms VBAT=4.2V
-
0.1
0.2
%
Pout=0.4Wrms VBAT=3.8V
-
0.1
0.2
%
Pout=0.3Wrms VBAT=3.4V
-
0.1
0.2
%
Efficiency
VBAT=4.2V 0.5W 8Ω 68uH 1kHz
85
%
VBAT=3.8V 0.5W 8Ω 68uH 1kHz
85
%
Static current
5
-
mA
Reference circuit is follow:
SPK_P
Close to speaker
TVS
TVS
10pF
33pF
33pF
33pF
Module
SPK_N
10pF
10pF
10pF
33pF
33pF
33pF
10pF
10pF
differential signal
& shielded by GND
Figure 29: Reference circuit of the speaker
4.12.5 Microphone Bias
The module provides two-channel microphone bias voltage output: MIC_BIAS0 and MIC_BIAS1. Users can
supply power to external silicon microphones. The output voltage can be set to 1.9v, 2.0v, 2.1v and 2.2v through
the software. The default voltage is 1.9v.
The internal block diagram is following: