Audio Interface; Audio Function Codec Responsibilities; Table 7. Audio Interface Features; Table 8. Audio Pin Description - Sierra Wireless AirPrime SL8084T Integration Manual

5. Audio Interface

The AirPrime SL8084T embedded module supports analog and PCM audio as summarized in the
following tables. Refer to document [2] AirPrime SL808x Product Technical Specification and
Customer Design Guidelines for detailed information about the audio interfaces.
Table 7. Audio Interface Features
Audio Type Feature
Analog Implementation
Implementation
Digital (PCM)
Power
Table 8. Audio Pin Description
Audio Type Signal Name
MIC_P
MIC_N
Analog
SPK_N
SPK_P
PCM_SYNC
PCM_DOUT
Digital
PCM_DIN
PCM_CLK
5.1.

Audio Function Codec Responsibilities

The responsibilities of the module codec and host codec for special functions are detailed in the
following table.
Table 9. Codec Responsible for Special Functions
FIR filtering
Noise suppression
Echo cancellation
High pass filtering/slope
filtering functions
4112719
Details
 Supports analog audio processing
 Does not provide on-board filtering (except for blocking
capacitors on microphone lines)
 Host must provide bias and signal filters
 Host should terminate unused audio lines with pull-down
resistors
Primary PCM supported to interface with external codec
1.8V (use VREG_MSME_1V8 as logic reference)
Pin # Description
53 Microphone positive terminal
54 Microphone negative terminal
56 Speaker negative terminal
57 Speaker positive terminal
64 PCM synchronization bit
65 PCM output
66 PCM input
67 PCM clock
Function
Tx and Rx paths
Required due to high sensitivity and gain in Tx path
Different for each audio path and environment (handset, headset,
car kit, speakerphone)
Required per phone acoustic requirements
Rev 2.1
Notes
In series with 0.1 μF DC
blocking capacitor
In series with 0.1 μF DC
blocking capacitor
8 kHz
2 MHz for primary PCM mode
Responsible
Codec
Module
Module
Module
Module
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