5.9 Analogue Audio

Low-level

High-level

Pin

 

Name

 

Direction

 

Function

 

 

 

 

 

 

 

53

 

MICIP

 

Input

 

Microphone input positive

 

 

 

 

 

 

 

54

 

MICIN

 

Input

 

Microphone input negative

 

 

 

 

 

 

 

55

 

EARP

 

Output

 

Earpiece output positive

 

 

 

 

 

 

 

56

 

EARN

 

Output

 

Earpiece output negative

 

 

 

 

 

 

 

57

 

AUXO

 

Output

 

Auxiliary audio from module to host

 

 

 

 

 

 

 

59

 

AUXI

 

Input

 

Auxiliary audio to module from host

 

 

 

 

 

 

 

60

 

AREF

-

 

Analogue reference

The analogue audio signals comprise of two audio inputs to the module, and two audio output from the module. The Auxiliary interface signals are single-ended, whilst the MIC and EAR interface signals are differential. Analogue audio can be used for various configurations, including a car kit mode, portable hands free and speakerphone (with an additional output gain stage).

Five audio profiles are available for GR64 users to configure various modes of operation. Each profile is factory set to represent different modes, typical of general usage. The customer can modify profiles to optimize acoustic performance to their specific application.

The analogue inputs and outputs share common uplink and downlink chains which are multiplexed, and selectively switched by the user through AT-commands.

LZT 123 1834

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