SYSTEM CONNECTOR INTERFACE
32
LZT 123 8020 R1A
Drive capability into 5 k
Ω
(0.3 - 3.5 kHz)
> 2.4 V
p-p
Drive capability into 1.5 k
Ω
(0.3
- 3.5 kHz)
> 2.2 V
p-p
Levels (THD < 5 %)
Drive capability into 150
Ω
(at 1 kHz)
> 1.3 V
p-p
5.7.3
Microphone Signals
Pin Speaker
signals
Dir Function
53
MICP
I
Microphone positive input
54
MICN
I
Microphone negative input
MICP and MICN are balanced differential microphone input
pins. These inputs are compatible with an electret microphone.
The microphone contains an FET buffer with an open drain
output, which is supplied with at least +2 V relative to ground by
the radio device as shown below.
Figure 5.5 Microphone connections to the radio device
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