Huawei MC509 CDMA LGA 3.8.2 Digital Audio

HUAWEI MC509 CDMA LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 01 (2011-04-08)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
39
Figure 3-13 Circuit diagram of the interface of the second audio channel
Module
(DCE)
+
_
ESDprotection
ESDprotection
ferritebead
SPKR_OUT_P
SPKR_OUT_N
MIC2_P
MIC2_N
ferritebead
ferritebead
ferritebead
1nF
1nF 1nF
1nF
1nF1nF
Speaker
MIC
+
_
 It is recommended that a TVS be used on the related interface, to prevent electrostatic
discharge and protect integrated circuit (IC) components.
 Data only does not support the voice function.
3.8.2 Digital Audio
The MC509 provides one digital audio channels (Data only doesn’t support the voice
function). Table 3-12 lists the signals on the digital audio interface.
Table 3-12 Signals on the digital audio interface
Pin
No.
Pin Name
I/O
Description
DC Characteristics (V)
Min
Typical
Max
5
PCM_SYNC
O
PCM interface sync
-0.3
2.6
2.9
6
PCM_DIN
I
PCM I/F data in
-0.3
2.6
2.9
7
PCM_DOU
T
O
PCM I/F data out
-0.3
2.6
2.9
8
PCM_CLK
O
PCM interface clock
-0.3
2.6
2.9
The MC509 PCM interface enables communication with an external codec to support
linear and μ-law format. The PCM_SYNC runs at 8kHz with a 50% duty cycle.