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Electrical Characteristics
The following table describes the electrical characteristics of the audio interface, MIC.
Parameters
Internal biasing
DC Characteristics
AC Characteristics
200 Hz<F<4 kHz
Maximum working voltage
( MICP-MICN)
(THD 10%)
Maximum rating voltage
(MICP or MICN)
*
The input voltage depends on the input micro gain set by the AT command. Refer to the WISMO218 AT
Commands Manual for more information about AT commands.
Note:
Because both MICP and MICN are internally biased, it is necessary to use a coupling capacitor to
connect an audio signal provided by an active generator. Only a passive microphone can be directly
connected to the MICP input.
WA_DEV_W228_PTS_002
Table 18. Electrical Characteristics of MIC
MICP
MICN without 2.2KΩ to GND
MICN with 2.2KΩ to GND
Output current
R2
Z2 MICP (MICN=Open)
Z2 MICN (MICP=Open)
Z2 MICP (MICN=GND)
Z2 MICN (MICP=GND)
Impedance between MICP
and MICN without 2.2KΩ to
GND
Impedance between MICP
and MICN with 2.2KΩ to
GND
AT+VGT*=1
Rev 001
Product Technical Specification &
Customer Design Guidelines
Minimum
Typical
-
2.4
-
2.4
-
1.2
-
2.2
2.2
2.2
4.5
3.2
-
-
-0.5
-
Maximum
Unit
-
V
-
V
-
V
mA
-
KΩ
KΩ
mVp
210
p
V
4.4
Page 55 of 108
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