MSM6882-3 データシートの表示（PDF） - Oki Electric Industry
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MSM6882-3 Datasheet PDF : 15 Pages
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¡ Semiconductor
MSM6882-3/6882-5
Name
BR
SG
GND
TI
Baud rate selection.
Master Clock MCS
(MHz)
1
7.3728
1
3.6864
0
3.6864
1
1
Description
BR Bit Rate
(bps)
1
2400
0
1200
0
1200
1
1200
0
600
Carrier Freq. (Hz)
Mark
Space
1200
2400
1200
1800
1200
1800
600
1200
600
900
Built-in analog signal ground.
The DC voltage is approximately half of VDD, so the analog interfaces signals of AI, AO, and TI
with peripheral circuits which must be implemented by AC-coupling. To make this voltage
source impedance lower and ensure the device performance of this device, more than 0.1 mF
bypass capacitors should be connected from SG to GND and from SG to VDD.
Ground. (0 V)
Voice signal input.
The signal input to this pin can be sent out to AO through the transmit LPF, the characteristics
of which, gives the splatter filter for voice band signal.
When this function is used, digital "0" must be input to ME.
TI is biased to SG through internal resistor.
Transmit analog signal output.
The data put on ME and FT can set the status of AO as follows.
FT
ME Transmit LPF
"1"
"1"
"1"
"0"
Power On
"0"
"1"
Power Down
"0"
"0"
State of AO
MSK Signal
Voice Signal
The Output of Receive BPF
No-signal (SG level)
TI
Power down
AO
SD
Modu-
lator
Transmit LPF
SG
+
–
AO
Receive BPF
AI
The state when FT and ME = "0" is shown above. When the input digital data on FT changes to
"1" from "0", AO remains to be connected to SG during about 2 ms and after that, and AO is
switched to transmit LPF.
This delay time prevents AO from outputting meaningless signal during transient time from
power down to on of LPF.
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