Mobile Tech Co. Ltd 64MXFWBF110A Manuale Utente
15
the master-mode PCM interface and master-mode I2S/EIAJ interface are supported. The
clock of PCM interface is 256 kHz, and the frame sync is 8 kHz. Both long sync and short
sync interfaces are supported. The PCM interface can transmit 16-bit stereo or 32-bit mono
8 kHz sampling rate voice signal. Table 6 show the pin map of DAI PCM.
I2S/EIAJ interface is designed to transmit high quality audio data. I2S/EIAJ can support 32
kHz, 44.1kHz, and 48kHz sampling rate audio signals. The clock frequency of I2S/EIAJ
can be 32×(sampling frequency), or 64×(sampling frequency). For example, to transmit a
44.1 kHz CD-quality music, the clock frequency should be 32 × 44.1 kHz = 1.4112 MHz or
64×44.1 kHz = 2.8224 MHz.
clock of PCM interface is 256 kHz, and the frame sync is 8 kHz. Both long sync and short
sync interfaces are supported. The PCM interface can transmit 16-bit stereo or 32-bit mono
8 kHz sampling rate voice signal. Table 6 show the pin map of DAI PCM.
I2S/EIAJ interface is designed to transmit high quality audio data. I2S/EIAJ can support 32
kHz, 44.1kHz, and 48kHz sampling rate audio signals. The clock frequency of I2S/EIAJ
can be 32×(sampling frequency), or 64×(sampling frequency). For example, to transmit a
44.1 kHz CD-quality music, the clock frequency should be 32 × 44.1 kHz = 1.4112 MHz or
64×44.1 kHz = 2.8224 MHz.
Table
Table
Table
Table 7
7
7
7：
Pin
Pin
Pin
Pin mapping
mapping
mapping
mapping of
of
of
of DAI,
DAI,
DAI,
DAI, PCM
PCM
PCM
PCM interfaces
interfaces
interfaces
interfaces
Pin
Name
Function
Pin
Name
Function
21
DAIRST
DAI reset signal input
22
DAISYNC
General
purpose
Input/Output pin 24
36
DAIPCMIN
DAI PCM data input
37
DAIPCMOUT
DAI
PCM
data
output
38
DAICLK
DAI PCM clock output
3.9.
3.9.
3.9.
3.9. PWM
PWM
PWM
PWM and
and
and
and Alerter
Alerter
Alerter
Alerter (needs
(needs
(needs
(needs software
software
software
software support)
support)
support)
support)
The output of the PWM signal should supported by software. We can do custom software
for users to support PWM signal.
for users to support PWM signal.
Table
Table
Table
Table8:
8:
8:
8: Alerter
Alerter
Alerter
Alerter and
and
and
and PWM
PWM
PWM
PWM interface
interface
interface
interface of
of
of
of the
the
the
the MD251
MD251
MD251
MD251
Pin
Name
Function
19
PWM
Pulse-width
modulated signal
modulated signal
3.10.
3.10.
3.10.
3.10. Antenna
Antenna
Antenna
Antenna
The RF interface has an impedance of 50Ω. The antenna cable can be soldered to the pad.
Pay attention, the line between the MD251 antenna pin and antenna connection should be
thick and short. It is better to use filter circuit to fit 50 ohms.
Pay attention, the line between the MD251 antenna pin and antenna connection should be
thick and short. It is better to use filter circuit to fit 50 ohms.
Table
Table
Table
Table9:
9:
9:
9: RF
RF
RF
RF output
output
output
output power
power
power
power：
Frequency
Max
Min
GSM850
33dBm±2dB
5dBm±5dB
E-GSM900
33dBm±2dB
5dBm±5dB
DCS1800
30dBm±2dB
0dBm±5dB
PCS1900
30dBm±2dB
0dBm±5dB
Table
Table
Table
Table10:
10:
10:
10: Module
Module
Module
Module RF
RF
RF
RF receive
receive
receive
receive sensitivity
sensitivity
sensitivity
sensitivity：
Frequency
Receive
sensitivity
sensitivity
GSM850
<-106dBm
E-GSM900
<-106dBm
DCS1800
<-104dBm