Integration Guide

4117336 Rev 1.0 May 18, 2015 15
4. Audio
The AirPrime AR7552 supports both Analog and Digital audio interfaces. The following diagram
illustrates the Audio subsystem and identifies where various AT commands affect the audio
subsystem. Refer to document [7] for details of the AT commands.
4.1. Analog Audio
The AirPrime AR7552 provides a mono differential analog audio interface.
Table 16. Analog Audio Interface Pads
Pad
Name
Direction
Function
Interface
CD9
AUDIO1_IN_P
Input
Microphone 1 input positive
Primary
CC10
AUDIO1_IN_M
Microphone 1 input negative
CE6
AUDIO1_OUT_P
Output
Speaker 1 output positive
CE8
AUDIO1_OUT_M
Speaker 1 output negative
Table 17. Analog Audio Interface Characteristics
Analog Audio
Min.
Typ.
Max.
Units
Audio IN
Input Impedance
16
20
24
kΩ
Signal Level – Differential
-0.3
-
2.9
dBV
Signal Level – Single-ended
(the unused audio signal must be tied to
GND or analog reference)
-0.3
-
2.9
dBV
Audio OUT
Signal Level – Differential
-
-
dBV
Signal Level – Single-ended
-0.3
-
2.9
dBV
Output Impedance
-0.3
-
2.9
Ω
Signal Drive Strength – Application Load
-
600
1M
kΩ