Audio signal descriptions are listed below:

Pin

Signal

 

Dir

 

Description

 

 

 

 

 

 

 

1

MICN

 

I

 

Microphone negative input

 

 

 

 

 

 

 

 

2

BEARN

O

Earpiece negative output

 

 

 

 

 

 

 

3

BEARP

 

O

 

Earpiece positive output

 

 

 

 

 

 

 

4

MICP

 

I

 

Microphone positive input

 

 

 

 

 

 

 

MICP and MICN are balanced differential microphone input signals. These inputs are compatible with an electret microphone.

BEARP and BEARN are the speaker output signals. These are differential mode outputs. The electrical characteristics are given in the table below.

Parameter

Limit

 

 

Output level (differential)

￿￿4.0 Vpp

 

 

Output level (dynamic load = 32 Ω)

￿￿2.8 Vpp

 

 

Distortion at 1 kHz and maximum output level

￿ 5 %

 

 

Offset, BEARP to BEARN

± 30 mV

 

 

Ear-piece mute-switch attenuation

￿￿40 dB

 

 

The following table shows the ear piece impedances that can be connected to BEARP and BEARN.

Ear piece model

Impedance

Tolerance

 

 

 

Dynamic ear piece

[32 Ω+ 800 µH] // 100 pF

± 20 %

 

 

 

Dynamic ear piece

[150 Ω+ 800 µH] // 100 pF

± 20 %

 

 

 

Piezo ear piece

1 kΩ+ 60 nF

± 20 %

 

 

 

Compliance with AMR may be required by certain network operators.

Owner’s Manual

Rev 1.0

Page 31 of 31