Mobile Tech Co. Ltd 64MXFWBF110A Manuale Utente
14
amplifier positive
input(+) output
input(+) output
amplifier negative
input(-) output
input(-) output
6
AU_OUT0_P
Earphone positive
output(+)
output(+)
7
AU_OUT0_N
Earphone
negative output(-)
negative output(-)
8
MP3_OUTR
Audio
analog
output
right
channel
9
MP3_OUTL
Audio
analog
output
left
channel
10
MICP1
Audio 1 chanel
11
SPK_N
Audio
amplifier
negative output
12
SPK_P
Audio
amplifier
positive output
It is suggested that you adopt following matching circuit in order to satisfy speaker effect.
The difference audio signals have to be layout according to difference signal layout rules. If
you want to adopt an amplifier circuit for audio, we commend National company’s
LM4890. But you can select it according to your needs.
The difference audio signals have to be layout according to difference signal layout rules. If
you want to adopt an amplifier circuit for audio, we commend National company’s
LM4890. But you can select it according to your needs.
The audio reference design as follow chart：
Figure3
Figure3
Figure3
Figure3 The
The
The
The reference
reference
reference
reference design
design
design
design of
of
of
of audio
audio
audio
audio
The microphone bias electric circuit was designed in MD251. The MIC_BIAS DC
characteristics see the table 6.
characteristics see the table 6.
Table
Table
Table
Table 6
6
6
6：MIC
MIC
MIC
MIC_BIAS
_BIAS
_BIAS
_BIAS DC
DC
DC
DC Characteristics
Characteristics
Characteristics
Characteristics
Parameter
Parameter
Parameter
Parameter
Minimum
Minimum
Minimum
Minimum
Typical
Typical
Typical
Typical
Maximum
Maximum
Maximum
Maximum Units
Units
Units
Units
Microphone Bias
Voltage (MIC_BIAS)
Voltage (MIC_BIAS)
1.9
V
Source Current
2
mA
All voice band data paths comply with the GSM 03.50 specification. Mono hands-free
audio are also provided. The audio stereo path facilitates CD-quality playback and voice
playback through a headset.
MD251 has a built-in high fidelity calss AB audio power amplifier. It is capable of
delivering 1 watt of power to an 8 ohm BTL load with less than 10% distortion.
audio are also provided. The audio stereo path facilitates CD-quality playback and voice
playback through a headset.
MD251 has a built-in high fidelity calss AB audio power amplifier. It is capable of
delivering 1 watt of power to an 8 ohm BTL load with less than 10% distortion.
3.8.
3.8.
3.8.
3.8. DAI
DAI
DAI
DAI PCM
PCM
PCM
PCM Interface
Interface
Interface
Interface
The Digital Audio Interface (DAI
DAI
DAI
DAI) block communicates with the System Simulator for
FTA or external Bluetooth modules. To communicate with the external Bluetooth module,