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參數(shù)資料
| 型號(hào)： | MC145446AFW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Single-Chip 300-Baud Modem with DTMF Transceiver |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO28 |
| 封裝： | 751M |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 264K |
| 代理商： | MC145446AFW |
MC145446A
4
MOTOROLA
TRANSMIT ATTENUATOR CHARACTERISTICS
(VCC = 5.0 V
±
10%, TA = – 20 to 70
°
C)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Attenuator Range
ARNG
AACC
0
—
15
dB
Attenuator Accuracy
1 dB – 5 dB
– 0.5
—
0.5
dB
6 dB – 9 dB
– 1
—
1
10 dB – 15 dB
– 1.7
—
1
RECEIVER CHARACTERISTICS (INCLUDES HYBRID, DEMODULATOR, AND CARRIER DETECTOR)
(VCC = 5.0 V
±
10%, TA = – 20 to 70
°
C)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Input Impedance
RIRX
VIRX
VCDON
VCDOF
RxA Pin
50
—
—
k
Receiver Carrier Amplitude
– 48
—
– 12
dBm
Carrier Detect Threshold
OFF to ON
CDA = 1.2 5V
fin = 1.0 kHz
—
– 44
—
dBm
ON to OFF
—
– 47
—
Hysterisis (VCDON – VCDOF)
Carrier Detect Timing
HYS
2
—
—
dB
OFF to ON
TCDON
CD1 = 0, CD0 = 0
—
450
—
ms
CD1 = 0, CD0 = 1
—
10
—
CD1 = 1, CD0 = 0
—
10
—
CD1 = 1, CD0 = 1
—
70
—
ON to OFF
TCDOFF
CD1 = 0, CD0 = 0
—
35
—
CD1 = 0, CD0 = 1
—
35
—
CD1 = 1, CD0 = 0
—
20
—
CD1 = 1, CD0 = 1
—
15
—
CPTD CHARACTERISTICS
(VCC = 5.0 V
±
10%, TA = – 20 to 70
°
C)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Bandpass Filter Center Frequency
fc
—
400
—
Hz
Bandpass Filter – 3 dB Band Width
BW
VTDON
VTDOF
—
140
—
Hz
Tone Detect Level
OFF to ON
CDA = 1.25 V
fin = 400 Hz
—
– 44
—
dBm
ON to OFF
—
– 47
—
Tone Detect Timing
OFF to ON
TTDON
—
10
—
ms
ON to OFF
TTDOF
—
25
—
DTMF TRANSMIT CHARACTERISTICS
(VCC = 5.0 V
±
10%, TA = – 20 to 70
°
C)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Tone Output Level
Low Group
Vfl
Vfh
Attenuator = 0 dB
RL = 1.2 k
—
2.5
—
dBm
High Group
RTLA =
∞
VTxA1 – VTxA2,
—
3.5
—
High Group Pre–Emphasis
PE
DIST
Crystal Frequency
3.579545 MHz
Single Tone Mode
0
—
3
dB
DTMF Distortion
—
5
—
%
DTMF Frequency Variation
fV
VOE
– 1
—
1
%
Out–of–Band Energy
Figure 1
dB
Setup Time
tosc
—
4
—
ms
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PDF描述 |
|---|---|
| MC145446A | Single-Chip 300-Baud Modem with DTMF Transceiver |
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