CMX469AE2 データシートの表示（PDF） - MX-COM Inc
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CMX469AE2 Datasheet PDF : 18 Pages
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1200/2400/4800bps MSK Modem
Transmitter Output
TX Output Level
Output Level Variation
1200/1800Hz
1200/2400Hz
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
1200bps
2400bps
4800bps
Logic ‘0’ Carrier Frequency
1200bps
2400bps
4800bps
13
CMX469A PRELIMINARY INFORMATION
Notes Min. Typ. Max. Units
1
775
mVRMS
0
±1.0
dB
0
±1.0
dB
0
±1.0
dB
10
3.0 5.0
%
10
2.0 3.0
%
25.0 40.0
µs
20.0 30.0
µs
10.0 20.0
µs
6
1200
Hz
6
1200
Hz
6
2400
Hz
6
1800
Hz
6
2400
Hz
6
4800
Hz
Operating Characteristics Notes:
1. Measured at VDD = 5.0 volts. Signal levels and thresholds are proportional to VDD.
2. Excludes any current drawn by external components, but includes current drawn by the crystal
components.
3. See Figure 6: Typical Variation of Bit Error Rate with Input Level
4. SNR = Signal-to-Noise Ratio in the Bit-Rate-Bandwidth.
5. See Figure 7: RX Bit-Error-Rate 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 3, Note 2 for details on
optimizing noise immunity.
10. For an unmodulated carrier
©1999 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480191.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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