Nokia NSB-7 Series Service Manual page 97

PAMS Technical Documentation
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.
Pin Name Min
X300/2 MICP
X300/1 MICN
Issue 1 06/00
Typ Max Unit
0.55 4.1 mV
0.55 4.1 mV
Figure 10: Microphone
ãNokia Mobile Phones Ltd.
Notes
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
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
NSB-7
UI Module
Page 17