SimCom SIM8905A User Manual page 21

Disabled output Measured externally, with amplifier disabled
impedance
Note: The VDD_CP is internal Voltage of module.
Earpiece
Class AB earpiece driver supports 10.67 Ω, 16 Ω, 32 Ω, and up to 50 KΩ loads. Its typical output power at 1.02
KHz, 6 dB gain, and THD + N ≤ 1% is:
119 mW with 32 Ω loads
243 mW with 16 Ω loads
320 mW with 10.67 Ω loads
EAR_P
EAR_M
Module
Table 11: Earpiece output performance specifications
Parameter
32 Ω load f = 1.02 kHz, 6 dB gain THD+N < 1%
Output power
16 Ω load f = 1.02 kHz, 6 dB gain THD+N < 1%
6 dB gain mode f = 1.02 kHz
Full-scale
output Voltage
1.5 dB gain mode f = 1.02 kHz
Output load
Disabled output Measured externally, amplifier disabled
impedance
Speaker
Class-D mono differential loud speaker driver supports 4 Ω and 8 Ω loads. The driver is powered from VBAT, and
does not support external 5 V Boost Option. Its typical output power at 1.02 KHz, 12 dB gain, and THD + N ≤
1% is:
950 mW with 8 Ω loads, VDD_SPKR=VBAT= 4.2 V
692 mW with 8 Ω loads, VDD_SPKR=VBAT= 3.6 V
1063 mW with 4 Ω loads, VDD_SPKR=VBAT= 3.6 V
33pF
10pF
33pF
10pF
33pF
10pF
Route as differential pair
& shielded by GND
Figure 22: Earpiece reference circuit
Test conditions
Smart Machine Smart Decision
1.0
Close to earpiece
10pF
10pF
10pF
Min
120.0
235.0
1.8
1.0
10.7
1.0
21
MΩ
- -
ESD
33pF
33pF
ESD
33pF
Typ Max Units
124.5 - mW
243.0 - mW
2.0 2.1 Vrms
1.2 1.3 Vrms
Ω
32 -
MΩ
- -