Semiconductor
MSM7510
OPERATION MODE
Table 1 Operation Mode
MOD2
0
0
1
1
MOD1
0
1
0
1
Mode
FSK Modem Normal Mode (Fig.2)
Analog Loop Back Test Mode (Fig.3)
Answer Tone Transmit/Detect Mode*
Power Down Mode
* Answer Tone Transmit:
RS
= "0"
RS
= "1"
Answer Tone Detect:
Detect
Non-detect
脝
脝
脝
脝
Enable
Disable
CD
= "0"
CD
= "1"
When transmitting the answer tone,
CD
is held at digital "1".
AI
Phone
Line
Receive Filter
Demodulator
RD
DTE
AO
Transmit Filter
Modulator
XD
Figure 2 FSK Modem Normal Mode
AI
Phone
Line
Receive Filter
Demodulator
RD
DTE
AO
Transmit Filter
Modulator
XD
SG
Figure 3 Analog Loop Back Test Mode
8/12