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參數(shù)資料
| 型號(hào)： | CMX469AD3 |
| 英文描述： | MODEM |
| 中文描述： | 調(diào)制解調(diào)器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 475K |
| 代理商： | CMX469AD3 |
1200/2400/4800 Baud FFSK/MSK Modem
CMX469A
2001 Consumer Microcircuits Limited
12
D/469A/2
Carrier Detect
Sensitivity
Probabilty of CD being High after bit 16:
with SNR = 12dB
with 230mVrms Noise and No Signal
Transmitter Output
Tx Output Level
Output Level Variation for 1200/1800Hz
or 1200/2400Hz or 2400/4800Hz
Output Distortion
3rd Harmonic Distortion
Isochronous Distortion
1200Hz - 1800Hz/1800Hz - 1200Hz
1200Hz - 2400Hz/2400Hz - 1200Hz
2400Hz - 4800Hz/4800Hz - 2400Hz
Logic ‘1’ Carrier Frequency 1200 Baud
2400 Baud
4800 Baud
Logic ‘0’ Carrier Frequency 1200 Baud
2400 Baud
4800 Baud
Notes
3
1, 7, 8
9
9
1
Min.
-
Typ.
-
0.995
0.05
775
-
3.0
2.0
25.0
20.0
10.0
1200
1200
2400
1800
2400
4800
Max.
150
Units
mVrms
mVrms
dB
%
%
μs
μs
μs
Hz
Hz
Hz
Hz
Hz
Hz
-
0
-
-
-
-
-
-
-
-
-
-
-
-
+/-1.0
5.0
3.0
40.0
30.0
20.0
-
-
-
-
-
-
10
10
6
6
6
6
6
6
Notes:
1.
Measured at V
2. Excludes any current drawn by external components, but includes current drawn by the crystal
components.
3. See Figure 6 (Typical Variation of BER with Input Signal Level).
4. SNR = Signal-to-Noise Ratio in the Bit-Rate Bandwidth.
5. See Figure 7 (Typical Rx BER vs Signal-to-Noise Ratio).
6. Dependent upon Xtal tolerance.
7. With an alternating (1010...) pattern.
8. Measured with a 150mVrms input signal (no noise).
9. A signal level of 230mVrms is used in C.D. probability measurements. Noise bandwidth is 5kHz
(1200/2400 baud operation) or 8kHz (4800 baud operation). See Section 1.4, Note 2 for details
on optimising noise immunity.
10. For an unmodulated carrier.
DD
= 5.0 volts. Signal levels and thresholds are proportional to V
DD.
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