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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 5/12頁(yè) |
| 文件大?。?/td> | 161K |
| 代理商： | MC145444P |
MC145444
MOTOROLA
5
Figure 1. Out–of–Band Energy
Figure 2. Switching Characteristics
– 55
– 15 dB/OCT.
f (Hz)
256 k
16 k
4 k
3.4 k
0
0
– 25
50%
50%
DATA
SCK
ENB
ENB
50%
50%
50%
PREVIOUS
DATA LATCHED
LAST
CLK
FIRST
CLK
tsu
th
tr
tf
tsu
trec
— VCC
— GND
— VCC
— GND
— VCC
— GND
— VCC
— GND
PIN DESCRIPTION
VCC
Positive Power Supply (Pin 15)
This pin is normally tied to the + 5.0 V. A 0.1
μ
F decoupling
capacitor should be used.
GND
Ground Pin (Pin 5)
This pin is normally tied to 0 V.
GNDA
Analog Ground (Pin 3)
Analog ground is internally biased to (VCC – VSS)/2. It
should be tied to ground through a 0.1
μ
F and 100
μ
F
capacitor.
X1
Crystal Oscillator Output (Pin 7)
Connecting a 3.579545 MHz
±
0.1% crystal between X1
and X2 will cause the transmit frequencies to be within
±
64 MHz of nominal. X1 is capable of driving several CMOS
gates. An external clock may be applied to X2. X1 should
then be left open.
X2
Crystal Oscillator Input (Pin 8)
Refer to X1.
SCK
Shift Resister Clock Input (Pin 13)
This pin is the clock input for the 15–bit shift register. Serial
data is loaded into the shift register on the rising edge of this
clock.
DATA
Serial Data Input (Pin 12)
This pin is the 15–bit serial data input. This data deter-
mines the mode, DTMF signal, transmit attenuation, carrier
detect time, channel, and transmit squelch.
ENB
Enable Input (Pin 14)
Data is loaded into the 15–bit shift register when this pin is
at a logic low. When this pin transitions from a logic high to
low, the data is transferred to the internal latch on the falling
edge of ENB. New data loaded into the shift register will not
affect the device operation until this pin transitions from high
to low. (See Figure 2.)
TxD
Transmit Data Input (Pin 11)
This pin is the transmit data input, The mark frequency is
generated when this pin is at the logic high level. The space
frequency is generated when the pin is at a logic low.
RxD
Receive Data Output (Pin 10)
This pin is the receive data output. A high logic level of this
pin indicates that the mark carrier frequency has been re-
ceived, and a low logic level indicates the space carrier fre-
quency has been received.
SD
Carrier/Call Progress Tone Detect (Pin 9)
This pin is the output from the carrier detector or call prog-
ress tone detector. This pin works as a carrier detector in the
FSK mode and as the call progress tone detector in the
CPTD mode. The output goes to a logic low level when the
input signal reaches the minimum threshold of the detect
level that is adjusted by the CDA voltage. When SD = H, the
receive data output (RxD) is clamped high to avoid errors
that may occur with loop noise. The SD pin is also clamped
high in the other modes except during the power–down
mode.
TxA1
Non–Inverting Transmit Analog Carrier Output (Pin 18)
This pin is the line driver non–inverting output of the FSK
and tone transmit analog signals. A + 6 dBm (max) differen-
tial output voltage can be obtained by connecting a 1.2 k
load resistor between Tx1 and Tx2. Attention must be set so
as not to exceed this level when an external input is added
to the DSI pin. A telephone line (600
) is driven through an
external 600
resistor. In this case, the output level be-
comes about half of differential output.
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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 |
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| 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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