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MC145444P датащи(PDF) 9 Page - Motorola, Inc

номер детали MC145444P
подробное описание детали  Single-Chip 300-Baud Modem
Download  12 Pages
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производитель  MOTOROLA [Motorola, Inc]
домашняя страница  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC145444P датащи(HTML) 9 Page - Motorola, Inc

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MC145444
MOTOROLA
9
TRANSMIT SQUELCH
The 1–bit serial data (SQ) controls the transmit analog sig-
nal. The FSK signal, DTMF tones, single tone, and answer
tone are disabled. The external signal to the DSI will be
transmitted at that time. The internal line driver works at all
times except during the power–down mode.
SQ
Squelch
1
Enable
0
Disable
CHANNEL
The transmit and receive channel is set up with a 1–bit se-
rial data (CH) when the function mode is either in FSK or
analog loopback.
When the function mode is either on the FSK or analog
loopback mode, the transmit and receive channel is set up
with a 1–bit serial data (CH).
CH
Channel
1
1 (Originate)
0
2 (Answer)
CARRIER DETECT TIME
The carrier detect time (see Figure 4 and Table 5) is set by
2–bit serial data (CD1, CD0). ton indicates the amount of time
the carrier is greater than Von threshold must be present be-
fore SD goes low.
toff, on the other hand, indicates the amount of delay time
SD goes high after the carrier level becomes lower than Voff
threshold.
Von
Voff
RxA
SD
toff
ton
Figure 4. Carrier Detect Timing
Table 5. Carrier Detect Time Truth Table
CD1
CD0
Carrier Detect Time (Typ)
CD1
CD0
ton (ms)
toff (ms)
0
0
450
30
0
1
15
30
1
0
15
15
1
1
80
10
POWER–ON RESET
When the power is switched on, this device has the follow-
ing conditions.
Function Mode
FSK
Transmit Attenuator
0 dB
Transmit Squelch
Enable
Channel
1 (Originate)


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