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
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
