Sierra Wireless AirPrime SL8080, Руководство по интеграции оборудования, Страница: 15 / 22

Rev 0.1 (Draft A) Sep.10 Proprietary and Confidential 15
4 4: Audio Interface
The module supports analog and PCM audio as summarized in
Table 4-1 and Table 4-2 . Refer to the product specification document
for detailed information about the audio interfaces.
Table 4-1: Audio interface features
Audio type Feature Details
Analog Implementation
•
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
Digital
(PCM)
Implementation
•
Primary PCM supported to interface with external codec
Power
•
1.8V (use VREG_MSME_1V8 as logic reference)
Table 4-2: Audio pins
Audio type Name Pin Description Notes
Analog
MIC_P 53
Microphone positive terminal
•
In series with 0.1 μ F DC
blocking capacitor
MIC_N 54 Microphone negative terminal
•
In series with 0.1 μ F DC
blocking capacitor
SPK_N 56 Speaker negative terminal
SPK_P 57 Speaker positive terminal
Digital (PCM)
PCM_SYNC 64 PCM synchronization bit
•
8 KHz
PCM_DOUT 65 PCM output
PCM_DIN 66 PCM input
PCM_CLK 67 PCM clock
•
2 MHz for primary PCM
mode