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參數(shù)資料
| 型號： | MC145444P |
| 廠商： | Motorola, Inc. |
| 英文描述： | Single-Chip 300-Baud Modem |
| 中文描述： | 單芯片300波特調(diào)制解調(diào)器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 161K |
| 代理商： | MC145444P |
MC145444
MOTOROLA
7
DATA
SCK
E
M0
CD1
CD0
CH
T3
T2
T1
T0
SQ
A3
A2
A1
A0
M2
M1
Figure 3. Serial Data Timing
Table 2. Output Status
Function Mode
M d
Output
RxD
SD
TxA1, TxA2
FSK
Received
Digital Data
Carrier
Detect
FSK
Analog Loopback
CPTD
H
CPTD
VCC/2
Answer Tone
Answer Tone
H
H
DTMF
H
H
DTMF Tone
Single Tone
H
H
Single Tone
Power–Down 1, 2
High–Z
High–Z
High–Z
Answer Tone Mode
The transmitter works as 2100 Hz answer tone generator.
The receiver is disabled.
DTMF Mode
The transmitter works as a DTMF tone generator. The
receiver is disabled.
Single Tone Mode
The transmitter output is one of the DTMF eight frequen-
cies. The receiver is disabled.
Power–Down Mode 1
Internal circuits except the oscillator are disabled, and all
outputs except the X1 pin go to the high impedance state.
The supply current decreases to 300
μ
A (max).
Power–Down Mode 2
All circuits including the oscillator stop working and all out-
puts go to the high impedance state. The supply current de-
creases to 1.0
μ
A (max).
Transmit Attenuator
Four–bit serial data (A3 – A0) sets up the analog transmit
level in the FSK, answer tone, DTMF, analog loopback, and
single tone mode. The range of the transmit attenuator is 0 –
15 dB in 1 dB steps. The external signal (DSI) is not affected
by this attenuator.
TONE FREQUENCY
The DTMF tones or the single tone mode is selected by
the 4–bit serial data (T3 – T0).
相關(guān)PDF資料 |
PDF描述 |
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| 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 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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