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Applicant: Motorola, INC
2.8.3
Speaker Port
The analog speaker port is the module's power-up default active output for voice calls and DTMF tones. It
is located at pins 67 and 69 on the interface connector, named SPKR_N and SPKR_P respectively.
It is designed as a differential output with 32Ω impedance, but may also be used as a single-ended output
referenced to the module's analog ground.
The speaker output is used for both the handset and the headset audio paths.
TABLE 10 – Speaker Port Specifications
Parameter
Conditions
Output
No load
Voltage
Programmable in 3 dB steps
Handset mode
Gain
Headset mode
(See table 17)
AC Output
Impedance
DC voltage
THD
32Ω load
Isolation
Speech, f > 4 KHz
Min
-35.8
-28.8
60
Motorola General Business Use
Page 23 of 36
C24 Hardware Interface Manual
Typ
Max
Units
2
V
PP
-14.8
dB
-7.8
32
Ω
1
V
0.15
%
dB
FCC ID: IHDP56JE1
Version 0.3
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