C24 Hardware Interface Manual
Version 0.3
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 32
Ω
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
Min
Typ
Max
Units
Output
No load
2
V
PP
Voltage
Gain
Programmable in 3 dB steps
Handset mode
Headset mode
(See table 17)
-35.8
-14.8
dB
-28.8
-7.8
AC Output
32
Ω
Impedance
DC voltage
1
V
THD
32
Ω
load
0.15
%
Isolation
Speech, f > 4 KHz
60
dB
Motorola General Business Use
Page 23 of 36
Applicant: Motorola, INC
FCC ID: IHDP56JE1
