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參數資料
| 型號： | MC145444 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Single-Chip 300-Baud Modem |
| 中文描述： | 單芯片300波特調制解調器 |
| 文件頁數： | 9/12頁 |
| 文件大?。?/td> | 161K |
| 代理商： | MC145444 |
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)
ton (ms)
450
toff (ms)
30
0
0
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)
相關PDF資料 |
PDF描述 |
|---|---|
| MC145444P | Single-Chip 300-Baud Modem |
| MC145446AFW | Single-Chip 300-Baud Modem with DTMF Transceiver |
| MC145446A | Single-Chip 300-Baud Modem with DTMF Transceiver |
| MC145446 | Single-Chip 300-Baud Modem with DTMF Transceiver |
| MC145447DW | Calling Line Identification(CLID) Receiver with Ring Detector |
相關代理商/技術參數 |
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|---|---|
| MC145446AFW | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC145447DW | 制造商:Motorola Inc 功能描述:CALLER NUMBER ID CIRCUIT, 16 Pin, Plastic, SOP |
| MC145447DWR2 | 制造商:Motorola Inc 功能描述:TELEPHONE MULTIFUNCTION CKT, 16 Pin Plastic SOP |
| MC145447P | 制造商:Motorola Inc 功能描述: |
| MC145475DW | 制造商:Motorola Inc 功能描述:DATACOM, ISDN CONTROLLER, PDSO28 |
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