Product Technical Specification & Customer Design Guidelines
54
Proprietary and Confidential - Specifications subject to change
2400058
Caution:
The voltage input value for MIC cannot exceed the maximum working voltage;
otherwise, clipping will appear.
MIC differential connection example
Figure 4-4: Example—MIC differential connection with LC filter (TBD)
LC filter (L1, L2, C2, C3, C4) considerations:
•
Filter is not mandatory. Audio quality may be good enough without it,
depending on the design.
•
Filter may be used to reduce TDMA noise (from EMI perturbation).
Table 4-22: Microphone interface parameters
Parameter / Description
Test
Min
a
Typ
a
Max
a
Units
Input DC common mode
voltage
1.13
1.25
1.38
V
Z
In1
Input impedance between
MIC1_P and MIC1_N
Fully differential, A/D path
16
20
24
k
THD
V
Total harmonic distortion
+Noise (voice)
All inputs:
•
AV
DD
= 2.5 V
•
13-bit mode
•
analog input at 229 mV
pp
•
498 Hz sine wave
3.5
%
a. Preliminary values
AirPrime SL module
Audio
ADC
MIC
C1
C2
C3
C4
L1
L2
S3
S4
MIC1_P
MIC1_N
1350 Ohm typ
100nF
100nF
1350 Ohm typ
1.2V typ
Summary of Contents for AirPrime SL808 Series
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