1200/2400bps MSK Modem for Trunked Radio Systems
17
MX429A
Static Values
Notes Min.
Typ.
Max. Units
Transmitter
Output Level
8.25
dB
dB
%
Output Level Variation
Output Distortion
3rd Harmonic Distortion
Logic '1' Frequency
10
-1.0
1.0
5.0
3.0
3.0
2.0
%
1200 baud
2400 baud
1200 baud
2400 baud
9
9
9
9
1200
1200
1800
2400
Hz
Hz
Hz
Hz
Logic '0' Frequency
Isochronous Distortion
1200Hz – 1800Hz/1200Hz - 2400Hz
1800Hz – 1200Hz/2400Hz - 1200Hz
25
20
40
40
µs
µs
Operating Characteristics Notes:
1. With each data line loaded as, C = 50pf and R = 10kꢁ.
2.
3.
V
= 4.6V.
= 0.4V
OUT
OUT
V
4. Sink/Source currents ꢅ 0.1mA.
5. Both Xtal and Xtal ꢆ 4 Outputs.
6. With 50dB Signal/Noise Ratio.
7. See Figure 4, Bit Error Rate.
8. This Response Time is measured using a 10101010101.... 01 pattern input signal at a level of
230mV (-2.3dB) with no noise.
RMS
9. Dependent upon Xtal tolerance.
10. The amplitude difference between the Transmit Output signals (tones) representing a logic ‘0’ a
logic ‘1’.
© 1998 MX-COM Inc.
www.mxcom.com Tel: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480128.007
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