PAMS Technical Documentation
UI Module
NSB-7
Issue 1 06/00
ã
Nokia Mobile Phones Ltd.
Page 17
Microphone
The internal microphone is placed on the B-cover. Microphone is OMNI directional. The
microphone requires a bias current to operate. The bias current is generated from
VCOBBA supply with a transistor. EMC protection parts are implemented on the mother-
board.
Figure 10: Microphone
Pin
Name
Min
Typ
Max
Unit
Notes
X300/2
MICP
0.55
4.1
mV
Connected to COBBA MIC2N input. The maxi-
mum value corresponds to 1kHz, 0 dBmO net-
work level with input amplifier gain set to 32
dB. Typical value is maximum value - 16 dB
X300/1
MICN
0.55
4.1
mV
Connected to COBBA MIC2P input. The maxi-
mum value corresponds to 1kHz, 0 dBmO net-
work level with input amplifier gain set to 32
dB. Typical value is maximum value - 16 dB
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