Shanghai SIMCom Wireless Solutions Limited 8PSA301 Manuale Utente
Smart Machine Smart Decision
22
SPK1P
Close to speaker
ESD
ESD
10pF
33pF
33pF
33pF
Module
SPK1N
10pF
10pF
10pF
33pF
33pF
33pF
10pF
10pF
Route as differential pair
& shielded by GND
Figure 23: Speaker reference circuit
Table 12: speaker driver output performance specifications
Parameter
Test conditions
Min
Typ
Max
Units
Output power (Pout)
(f = 1 kHz, gain = 12 dB,
THD+N ≤ 1%)
15 μH + 8 Ω + 15 μH, Vdd = 3.6 V
584
631
-
mW
15 μH + 4 Ω + 15 μH, Vdd = 3.6 V
862
953
-
mW
15 μH + 8 Ω + 15 μH, Vdd = 3.8 V
662
710
-
mW
15 μH + 8 Ω + 15 μH, Vdd = 4.2 V
819
879
-
mW
THD+N
(1 kHz)
1 W Pout, VDD_SPKR = 4.2 V
-
-85.0
-75.0
dB
800 mW Pout, VDD_SPKR = 4.2 V
-
-75.0
-45.0
dB
600 mW Pout, VDD_SPKR = 3.8 V
-
-75.0
-70.0
dB
500 mW Pout, VDD_SPKR = 3.6 V
-
-76.0
-71.0
dB
Efficiency
(Vdd = 3.7 V)
500 mW Pout, 15 μH + 8 Ω + 15 μH
82.0
84.0
-
%
1 W Pout, 15 μH + 4 Ω + 15 μH
73.0
78.0
-
%
output impedance
Disabled
25
-
-
kΩ
Shutdown
current
-
0.1
1.0
µA
Turn on time
-
0.2
10.0
ms
Microphone bias
SIM8905A provides two microphone bias outputs: MIC_BIAS1and MIC_BIAS2.
The microphone bias cannot be used for ECM-type microphone. MIC_BIAS1and MIC_BIAS2 could be used
The microphone bias cannot be used for ECM-type microphone. MIC_BIAS1and MIC_BIAS2 could be used
for External MEMS microphone as power supply.
The microphone bias output performance specifications are shown in the following table:
Table 13: Microphone bias output performance specifications
Parameter
Test conditions
Min
Typ
Max
Units