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Audio Interface; Handset Microphone Port - Motorola C24 CDMA 1X Hardware Interface Manual

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Applicant: Motorola, INC

2.8 Audio Interface

The module supports the following audio devices:
Two single-ended biased analog microphone inputs for use in a variety of modes.
Two differential mono analog speaker outputs for use in a variety of modes.
A digital serial interface using PCM coding.
TABLE 7 – Audio Interface signals
Pin (s)
Signal Name
55
HDST_INT_N
57
HDST_MIC
59
AGND
61
MIC
63
ALRT_N
65
ALRT_P
67
SPKR_N
69
SPKR_P
18
PCM_DIN
20
PCM_DOUT
22
PCM_CLK
24
PCM_FS
2.8.1

Handset Microphone Port

The handset microphone port is the module's power-up default active audio input for voice calls. It is
located on pin 61 at the interface connector, named MIC.
It is designed as a single-ended input and should be referenced to the module analog ground.
The microphone input includes all the necessary circuitry to support a direct connection to an external
microphone device. It incorporates an internal bias voltage of 1.8V through a 2.2KΩ resistor, and has an
impedance of 1KΩ.
Description
Headset detection signal
Headset microphone signal / Differential Microphone
(positive)
Audio Ground
Handset microphone signal / Differential Microphone
(negative)
Differential Loud speaker (negative)
Differential Loud speaker (positive)
Handset differential speaker (negative)
Handset differential speaker (positive)
Digital audio receive
Digital audio transmit
Digital audio clock
Digital audio frame sync.
Motorola General Business Use
Page 21 of 36
FCC ID: IHDP56JE1
C24 Hardware Interface Manual
Version 0.3

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