MSM6948 Ver la hoja de datos (PDF) - Oki Electric Industry
Número de pieza
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MSM6948 Datasheet PDF : 13 Pages
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¡ Semiconductor
MSM6948/6948V
Name
DG
TI
AO
Description
Digital ground.
This pin should be common with AG at the system ground point as close as possible.
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 internally to SG with about 100 kW.
Transmit analog signal output.
According to the control data on ME and FT, AO is set to various state as an output terminal as
follows.
FT
ME Transmit LPF
"1"
"1"
"1"
"0"
Power On
"0"
"1"
Power Down
"0"
"0"
State of AO
The output of
MSK Signal
Transmit LPF
Voice Signal
The Output of Receive BPF
(Used for Device Test Only)
No-signal Output
(DC-biased to SG)
TI
SD
Modu-
lator
Power down
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 12 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.
Receive analog signal input.
AI
AI is biased internally to SG with about 100 kW same as TI. Receive BPF and demodulator
extract the information in this signal and convert it into a serial data stream at RD output.
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