User's Manual

HiLo3G-850 User Manual
04 March 2011 - Page 13 / 36
Reference Bead: Murata BLM18HD102SN1D
Figure 11: Filter and ESD protection for 32 ohms speaker
SPK1
12
C77NC
R114 100KR2F
C80
NC
B2
BLM18HD102SN1D
C81
NC
VIN_3.7
VIN_3.7
C70 10uC16TAM10
SPKR_OUT+_1
C74
0.1uC2X7K16
C71 10uC16TAM10
SPKR_OUT-_1
R112
150kR2F
C72
10uC5X7K10
B3
BLM18HD102SN1D
R113
150kR2F
C73NC TPA2010D1YZFTU22
GND
B3
V_DD
B1
V_O-
A3
V_O+
C3
IN-
C1
IN+
A1
PV_DD
B2
SHUTDOWN*
C2
GND
A2
Figure 12: Example of D class TPA2010D1 1Watt audio amplifier connections
3.2.2.3 Recommended Microphone Characteristics
Microphone: 8 and 16 kHz sampling rate, 16 bit.
In addition to the headset with microphone, the only external components required to implement this feature is one 2.2 k
resistor and two 0.1μF caps.
Parameter
Comments
Min
Typ
Max
Units
MIC bias voltage
–
1.8
–
V
MIC bias current
Programmable
0.020
–
1.50
mA
MIC bias voltage
accuracy
Minimum load
-3
–
+3
%
MIC bias voltage load
regulation
30
–
–
Ω
Load capacitor
At HSED_BIAS pin; ensures
stability
0.1
–
1.0
uF
Supply current
Active state
Idle state
–
50
10
100
100
uA
nA
Parameter
Test conditions
Min
Typ
Max
Units
Notes
Full-scale input
Voltage across either MIC1P and
0.89
1
1.12
Vrms