Smart Machine Smart Decision
21
Disabled output
impedance
Measured externally, with amplifier disabled
1.0
-
-
MΩ
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
Close to earpiece
ESD
ESD
10pF
33pF
33pF
33pF
Module
EAR_M
10pF
10pF
10pF
33pF
33pF
33pF
10pF
10pF
Route as differential pair
& shielded by GND
Figure 22: Earpiece reference circuit
Table 11: Earpiece output performance specifications
Parameter
Test conditions
Min
Typ
Max
Units
Output power
32
Ω load f = 1.02 kHz, 6 dB gain THD+N < 1%
120.0
124.5
-
mW
16
Ω load f = 1.02 kHz, 6 dB gain THD+N < 1%
235.0
243.0
-
mW
Full-scale
output Voltage
6 dB gain mode f = 1.02 kHz
1.8
2.0
2.1
Vrms
1.5 dB gain mode f = 1.02 kHz
1.0
1.2
1.3
Vrms
Output load
10.7
32
-
Ω
Disabled output
impedance
Measured externally, amplifier disabled
1.0
-
-
MΩ
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
