FX469 データシートの表示（PDF） - CML Microsystems Plc
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FX469 Datasheet PDF : 9 Pages
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Specification ......
Characteristics
See Note
Transmitter Output
Tx Output Level
Output Level Variation
1200/1800Hz or 1200/2400Hz or 2400/4800Hz
Output Distortion
3rd Harmonic Distortion
Logic ‘1’ Carrier Frequency 1200 Baud
6
2400 Baud
6
4800 Baud
6
Logic ‘0’ Carrier Frequency 1200 Baud
6
2400 Baud
6
4800 Baud
6
Isochronous Distortion
1200Hz - 1800Hz/1800Hz - 1200Hz
1200Hz - 2400Hz/2400Hz - 1200Hz
2400Hz - 4800Hz/4800Hz - 2400Hz
Min.
-
0
-
-
-
-
-
-
-
-
-
-
Typ.
Max.
775
-
3.0
2.0
1200
1200
2400
1800
2400
4800
25.0
20.0
-
-
±1.0
5.0
3.0
-
-
-
-
-
-
40.0
30.0
10.0
Unit
mVrms
dB
%
%
Hz
Hz
Hz
Hz
Hz
Hz
µs
µs
20 µs
Notes
1. With reference to V = 5.0 volts.
DD
2. Xtal frequency, type and tolerance depends upon system requirements.
3. See Figure 5 (variation of BER with Input Signal Level).
4. SNR = Signal-to-Noise Ratio in the Bit-Rate Bandwidth.
5. See Figure 2.
6. Dependent upon Xtal tolerance.
7. 10101010101 ...01 pattern.
8. Measured with a 150mVrms input signal (no noise); 1200/2400 baud operation.
9. Reference (0dB) level for C.D. probability measurements is 230mVrms.
10. For 1200 and 2400 baud operation only; when operating at 4800 baud the Carrier Detect output
should be ignored.
1 x 10 -1
* BIT RATE BANDWIDTH
1 x 10 -2
1 x 10 -3
10dB SNR*
12dB
SNR*
1 x 10 -4
1 x 10 -5
50
100
150
Fig.6 Typical Variation of Bit Error Rate with Input Level
200 250 300
500 700 800
INPUT SIGNAL LEVEL (mVrms)
7
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