
GM29 INTEGRATOR’S MANUAL
30
LZT 123 7361 R1B
Audio signal descriptions are listed below:
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.
The following table shows the ear piece impedances that can be
connected to BEARP and BEARN.
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
Parameter
Limit
Output level (differential)
≥
4.0V
pp
Output level (dynamic load = 32
Ω
)
≥
2.8V
pp
Distortion at 1kHz and maximum output level
≤
5%
Offset, BEARP to BEARN
±30mV
Ear-piece mute-switch attenuation
≥
40dB
Ear piece model
Impedance
Tolerance
Dynamic ear piece
[32
Ω
+ 800µH] // 100pF
±20%
Dynamic ear piece
[150
Ω
+ 800µH] // 100pF
±20%
Piezo ear piece
1k
Ω
+ 60nF
±20%
Содержание GM29
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Страница 11: ...Product Photo Illustration Part 1 Overview ...
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Страница 23: ...Product Photo Illustration Part 2 Integrating the Modem ...
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Страница 51: ...Product Photo Illustration Part 3 Using AT Commands ...
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