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The gain values presented in the table apply for a differential output vs. single-ended/differential input.
Loop test
External Mic to
External Earpiece
External Mic to
Internal Earpiece
External Mic to
Internal handsfree
Internal Mic to
External Earpiece
Measurement data
Figure 12 Single-ended output waveform of the Ext_in_HP_out measurement when earpiece is connected.
Page 3 –26
Input
Output
terminal
terminal
XMICP and
HSEAR R
GND
and GND
HSEAR L and
GND
XMICP and
EarP and
GND
GND
EarN and
GND
XMICP and
E2101 pad
GND
E2102 pad
B2100 (OUT/
HSEAR R
GND)
and GND
HSEAR L and
GND
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BB Troubleshooting and Manual Tuning Guide
Path
Input
gain
voltage
[dB]
[mVp-p]
(fixed)
-2.9
1000
-4.0
750
8.5
920
22.7
100
RM-272; RM-273
Differe
Outp
Output
ntial
ut DC
current
output
level
[mA]
voltage
[V]
[mVp-
p]
720
1.2
NA
490
1.2
NA
2520
0
25mA
(calc.)
1360
1.2
NA
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