Loop test
Input
terminal
Output
terminal
Path gain
[dB] (fixed)
Input voltage,
1 kHz sine
[mVp-p]
Single-ended
output
voltage [mVp-
p]
Output
DC level
[V]
AV mic to HP ear HS_MIC
and GND
B2101 pad1
and GND
+18.2
100
407
1.5
B2101 pad2
and GND
Ext microphone
in Int handsfree
out
HS_MIC
and GND
B2102 pad1
and GND
+3.6 with
lowpass
filter
1000
758 with
lowpass filter
See the
Measurement
data
graphics
below
NA
B2102 pad2
and GND
B2103 pad1
and GND
B2103 pad2
and GND
Measurement data
Figure 27 AV mic to AV ear, single-ended loop measurement. 16 kHz lowpass filter is used to attenuate noise from the
signal. The filter is optional.
RM-424; RM-564
BB Troubleshooting and Manual Tuning Guide
Issue 1
COMPANY CONFIDENTIAL
Page 3 –51
Copyright © 2009 Nokia. All rights reserved.
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