Loop test
Input
terminal
Output
terminal
Path
gain
[dB]
(fixed)
Input
voltage
[mVp-
p]
Output
voltage
[mVp-p]
Output
DC level
[V]
Output
current [mA]
AV Mic to AV
Earpiece
HS_MIC &
GND
HS_EAR_L &
GND
100
1.2
NA
HS_EAR_R &
GND
AV Mic to HP
Earpiece
HS_MIC &
GND
EarP & GND
100
1.2
NA
EarN & GND
HP Mic to AV
Earpiece
Acoustical
input, 1kHz
sine wave
HS_EAR_L &
GND
NA
94 dB
SPL
100
NA
HS_EAR_R &
GND
External Mic in
Internal
handsfree out
HS_MIC &
GND
B2153
1000
B400
Measurement data
Earpiece signal
Figure 38 Single-ended output waveform of the AV Mic to HP Ear measurement when earpiece is connected.
Integrated handsfree signal
RM-505; RM-506
BB Troubleshooting and Manual Tuning Guide
Page 3 –66
COMPANY CONFIDENTIAL
Issue 1
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