Analog Audio Interface; Pin Descriptions; Microphone Features; Audio Interface Features - Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines

Product Technical Specification & Customer Design Guidelines
Table 4-20: Analog audio interface connections
Pin Name
53 MIC1_P
54 MIC1_N
56 SPK_N
57 SPK_P
52 Proprietary and Confidential - Specifications subject to change

4.10 Analog audio interface

The AirPrime SL808X Embedded Module analog audio interface supports one
microphone input and one speaker output.
Table 4-15 describes the purpose and features of this interface.
Table 4-19: Audio interface features
Feature
•
•
Implementation
•
•
•
•
•
Features

4.10.1 Pin descriptions

Table 4-20 describes the analog audio interface pins.
I/O type Description
Line Audio input
Line Audio input
Main speaker
Main speaker

4.10.2 Microphone features

The microphone can be connected in either differential or single-ended mode:
• Differential mode—Default method (recommended). Rejects common mode
noise and TDMA noise.
• Single-ended mode—Requires good ground plane, filtering and shielding to
avoid audio path disturbances. Note that the audio input signal is decreased
by 6 dB compared to differential mode.
Details
Supports analog audio processing
Does not provide on-board filtering (except for
0.1 µFblocking capacitors on microphone lines)
Host must provide bias and signal filters
Host should terminate unused audio lines with pull-down
resistors
ESD protection may be required on audio interface lines
Echo cancellation and noise reduction
TTY/TDD compatibility through the microphone/speaker
connections (Note: TTY/TDD is not supported by the PCM
interface.)
Type Notes
A Differential audio input, line level. In series
with 0.1µF DC blocking capacitor.
A Differential audio input, line level. In series
with 0.1µF DC blocking capacitor.
A Differential audio output, line level
A Differential audio output, line level
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