Nokia 7088 Troubleshooting Manual page 20

7088 (Flower)
Base band Description and Troubleshooting
JACK_MIC- are used for headsets.
The internal microphone (MIC+/-) is differential AC connection to the MSM
(MIC1P/N). The headset microphone is single-ended AC connection to the MSM
(MIC2P/N).
The MICBIAS output ("MIC_BIAS" signal) is used for internal microphone bias to
provide 0.2 mA of current at 1.8 Volts DC.
VDD_MSMP (2.95V) regulated voltage from PM IC is used for headset microphone
bias.
Figure 16: Audio Receiving Direction Block Diagram
RECEIVER+ & RECEIVER- (MSM pins EAR1OP & EAR1ON) differential outputs are
used for the mobile terminal's internal receiver. HPH_L (MSM pin EAR2)
single-ended output is used for accessory external headset. AUXOP & AUXON
differential outputs are used to drive external loudspeaker via external audio power
amplifier (U100).
The output power for the differential (EAR1O) output is typically 35 mW for a
full-scale +3 dBm0 sine wave into a 32 ohm receiver.
The output power for the single-ended (EAR2) output is typically 8.8 mW for a
full-scale +3 dBm0 sine wave into a 32 ohm receiver (earpiece).
The output power for the auxiliary (AUXO) output is typically 1.87 mW for a full-scale
+3 dBm0 sine wave into a 600 OHM load.
Page 20 © 2006 Nokia Corporation Company Confidential Issue 1 12/2006