User Guide

PAMS Technical Documentation System Module & UI
NHM-8NX
Issue 1 05/02 ãNokia Corporation Page 17
Table 16: External microphone
Table 17: External speaker, differential output XEARP(HF) & XEARN (HFCM)
Table 18: Headset detection
DC-OUT (J307,J308 & J309)
Table 19: DC-OUT Connections
SIM (X387)
1 CHGND - 0 - Charger ground
Signal Min Nom Max Condition Note
MIC2P (Differential input P) - - 100mV
pp
G=20dB 1kΩ to MIC1B
MIC2N (Differential input N) - - 100mV
pp
G=20dB 1kΩ to GND
MICB2 (Microphone Bias) 2.0 V 2.1 V 2.25 V DC Unloaded
External loading of MICB2 - - 600uA DC
Signal Min
No
m
Max Units Note
Output voltage swing*
* seen from transducer side
2.0 - - Vpp Differential output, with 60 dB
signal to total distortion ratio
Common voltage level for
HF output (HF & HFCM) VCMHF
0.75 0.8 0.85 V
Load Resistance (HF to HFCM) 30 - - W
Load Capacitance (HF to HFCM) - - 10 nF
Signal Min Nom Max Condition Note
HookInt 0V - 2.86V (VANA) Headset button call control, connected
to UEM AD-converter
HeadInt 0V - 2.86V (VANA) Accessory detection, connected to
UEM AD-converter
Pad Name Parameter Min Typ Max Unit Notes
J307 Power Voltage (open) - - Vbat V Output power line
Current (short) 56 64 72 mA
J308 CTI(Input) Resistor value 30.9 - 750 kΩ Cover detection
J309 GND - - - - - Ground