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參數(shù)資料
| 型號(hào)： | MC145745FW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | V.21/V.23 Telemeter Modem |
| 中文描述： | 1.2 kbps DATA, MODEM, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 172K |
| 代理商： | MC145745FW |
MC145745
6
MOTOROLA
DTMF TRANSMIT CHARACTERISTICS
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Tone Output Level
Low Group
Vfl
Vfh
PE
DIST
Transmit Attenuator = 0 dB
RTLA = 0
fosc = 3.579545 MHz
Single Tone Mode
RL= 1 2 k
RL = 1.2 k
VTxA1 – VTxA2
VTxA1 VTxA2
—
0
—
dBm
High Group
—
1
—
dBm
High Group Pre–Emphasis
0
—
3
dB
DTMF Distortion
—
5
—
%
DTMF Frequency Deviation
fV
VOE
– 1
—
1
%
Out–of–Band Level
Refer to Figure 1
dB
Setup Time
tosc
—
4
—
ms
DTMF RECEIVER CHARACTERISTICS
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Input Resistance
50
500
—
k
Detection Signal Level (Each Tone)
BR3 = (0, 0, 1, 0)
– 48
—
0
dBm
Twist (High/Low Group)
– 10
—
10
dB
Frequency Detection Band Width
(Figure 3)
1.5% + 2 Hz
– 1.5% – 2Hz
—
—
—
—
Frequency Non–Detection Band Width
(Figure 3)
—
—
±
3.5%
DTMF Detection Timing
(Figure 2)
OFF to ON
Delay
TDVON
CD1 = 0 , CD0 = 0
—
30
—
ms
CD1 = 0 , CD0 = 1
—
35
—
CD1 = 1 , CD0 = 0
—
45
—
ON to OFF
Delay
TDVOFF
CD1 = 0 , CD0 = 0
—
25
—
CD1 = 0 , CD0 = 1
—
35
—
CD1 = 1 , CD0 = 0
—
25
—
DEMODULATOR CHARACTERISTICS
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
V.21 Bit Bias
Receive Level = – 24 dBm
S/N = 4 dB
—
5
—
%
V.23 Bit Bias
Receive Level = – 24 dBm
S/N = 14 dB
—
10
—
%
V.21 Bit Error Rate
Receive Level = – 24 dBm
S/N = 4 dB
511–Bit Pattern
—
0.00001
—
V.23 Bit Error Rate
Receive Level = – 24 dBm
S/N = 14 dB
511–Bit Pattern
—
0.00001
—
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