Nokia Mobile Phones NSE-5 Series, Service Manual, Page: 272 / 327

PAMS
Technical Documentation
HFU–2 Handsfree Unit
Page 6
Original 11/97
HFS–12 Audio Specifications, acoustic
Minimum Typical /
Nominal Maximum Unit / Notes
Electroacoustic transfer func-
tion (RX) dBPa/1V/0.5m 11 15 19 dBPa / 1V at system
connector is theoreti-
cal level
Speaker distortion level at
XEAR–SGND, d=5% 354 mVrms
HF–speaker: SPL, approxi-
mate over 500 ... 3000 Hz 87
–4 89
–2 91
0
dB / 1W / 1m
dBPa / 0.5W at 0,5m
Equivalent input noise,
XEAR 10 uVrms psofometric
Total noise, HF speaker 200 400 uVrms psofometric
HFM–8 Audio Specifications, acoustic
Minimum Typical /
Nominal Maximum Unit / Notes
Electroacoustic transfer func-
tion (TX) dBV/dBPa/0.5m –28 –24 –20 dBV/–5dBPa/0.5m
Total noise, XMIC–SGND 140 300 uVrms psofometric
Audio signal levels
Signal name / conn. / pin Minimum Typical /
Nominal Maximum Unit / Notes
XEAR / X100 / 4 80 354 mVrms
SGND / X100 / 3 0 mVrms
XMIC / X100 / 2 60 990 mVrms
HFMIC / X400 / 2 2.0 mVrms
SPEAKER / X500 / 1 & 2 0.75 5 V rms
Signals and Connections
Connector Name Code Notes Specifications / Ratings
System connector X100 Charge, Mbus, Fbus, audio
lines, VB Modular 15 pin.
Handset / Data connector X200 Mbus, Fbus, Handset au-
dio– lines, Hshook, 10V Modular 10 pin.
Car connector X300 +VB, –VB, ign. sense, car
radio mute, antenna motor
control 2 X 3 Power conn.
HFMIC connector X400 External microphone 2.5 mm jack
EXT. SPEAKER connector X500 External speaker 3.2 mm jack