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參數(shù)資料
| 型號(hào)： | MC145745 |
| 廠(chǎng)商： | Motorola, Inc. |
| 英文描述： | V.21/V.23 Telemeter Modem |
| 中文描述： | 遙測(cè)V.21/V.23調(diào)制解調(diào)器 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大小： | 172K |
| 代理商： | MC145745 |
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MC145745
MOTOROLA
5
AC ELECTRICAL CHARACTERISTICS
(VCC = + 3.6 V
±
0.3 V, TA = – 30 to + 85 C)
TRANSMIT CARRIER CHARACTERISTICS
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
V.21 Carrier Frequency
Originate Mode
Mark “1”
f1M
f1S
f2M
f2S
f1M
f1S
VO
V2h
VOE
Oscillation Frequency:
3 579545 MHz (X2)
3.579545 MHz (X2)
or 7.159090 MHz (ECLK)
974
980
986
Hz
Space “0”
1174
1180
1186
V.21 Carrier Frequency
Answer Mode
Mark “1”
1644
1650
1656
Space “0”
1844
1850
1856
V.23 Carrier Frequency
Mark “1”
1294
1300
1306
Space “0”
2094
2100
2106
Transmit Carrier Level
Transmit Attenuator = 0 dB
0 RL
RTLA = 0, RL = 1.2 k
VTxA1 – VTxA2
VTxA1 VTxA2
1 2 k
—
4
—
dBm
Secondary Harmonic Level
—
– 40
—
dB
Out–of–Band Level
Refer to Figure 1
dBm
TRANSMIT ATTENUATOR CHARACTERISTICS
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Attenuation Range
0
—
15
dB
Attenuator Accuracy
1 – 5 dB
6 – 9 dB
10 – 15 dB
– 0.5
– 1
– 1.7
—
—
—
0.5
1
1
dB
RECEIVER CHARACTERISTICS
(Includes Hybrid, Demodulator, and Carrier Detector)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Input Resistance
RIRX
VIRX
VCDON
VCDOFF
HYS
TCDON
50
500
—
k
Receive Carrier Amplitude
– 48
—
– 12
dBm
Carrier Detection
Threshold
OFF to ON
CDA = 1.25 V
1 0 kHz
fin = 1.0 kHz
BR3 (b1) = 1
—
– 44
—
dBm
ON to OFF
—
– 47
—
Hysteresis (VCDON – VCDOFF)
Carrier Detection Timing
2
—
—
dB
OFF to ON
CD1 = 0, CD0 = 0, CD Pin
—
450
—
ms
CD1 = 0, CD0 = 1, CD Pin
—
15
—
CD1 = 1, CD0 = 0, CD Pin
—
15
—
CD1 = 1, CD0 = 1, CD Pin
—
75
—
ON to OFF
TCDOFF
CD1 = 0, CD0 = 0, CD Pin
—
30
—
CD1 = 0, CD0 = 1, CD Pin
—
30
—
CD1 = 1, CD0 = 0, CD Pin
—
15
—
CD1 = 1, CD0 = 1, CD Pin
—
10
—
CPTD CHARACTERISTICS
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
BPF Center Frequency
fc
fi
—
400
—
Hz
BPF Pass–Band Lower Cut–Off
Frequency
– 3 dB
—
330
—
Hz
BPF Pass–Band Upper Cut–Off
Frequency
fh
– 3 dB
—
470
—
Hz
CPT Detection Level
VTD ON
VTDON
VTDOFF
CDA = 1.25 V
fin = 400 Hz
BR3 (b1) = 1
—
– 44
—
dBm
VTD OFF
—
– 47
—
CPT Detection Timing
TTD ON
TTDON
TTDOFF
—
10
—
ms
TTD OFF
—
25
—
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