ST7538
Mark and Space Frequencies
Mark and Space Communication Frequencies are defined by the following formula:
F ("0") = FCarrier + [∆F]/2
F ("1") = FCarrier - [∆F]/2
∆F is the Frequency Deviation.
With Deviation = “0.5” the difference in terms of frequency between the mark and space tones is half the
Baudrate value (∆F=0.5*BAudrate). When the Deviation = “1” the difference is the Baudrate itself (∆F=
Baudrate). The minimal Frequency Deviation is 600Hz.
Table 3.
Exact Frequency [Hz]
(Clock=16MHz)
Exact Frequency [Hz]
(Clock=16MHz)
Carrier
Frequency
(KHz)
Carrier
Frequency
(KHz)
Baud
Rate
Baud
Rate
Deviation
Deviation
“1”
“0”
“1”
“0”
60
66
72
76
600
1200
2400
4800
600
--
1
82.05
600
1200
2400
4800
600
--
1
59733
59733
59408
59408
58757
58757
57617
60221
60221
60547
60547
61198
61198
62337
81706
81706
81380
81380
80892
80892
79590
82357
82357
82682
82682
83171
83171
84473
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
--
86
--
1
65755
65755
65430
65430
64779
64779
63639
66243
66243
66569
66569
67220
67220
68359
1
85775
85775
85449
85449
84798
84798
83659
86263
86263
86589
86589
87240
87240
88379
1200
2400
4800
600
0.5
1
1200
2400
4800
600
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
--
110
--
1
71777
71777
71452
71452
70801
70801
69661
72266
72266
72591
72591
73242
73242
74382
1
109701
109701
109375
109375
108724
108724
107585
110352
110352
110677
110677
111165
111165
112467
1200
2400
4800
600
0.5
1
1200
2400
4800
600
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
--
132.5
--
1
75684
75684
75358
75358
74870
74870
73568
76335
76335
76660
76660
77148
77148
78451
1
132161
132161
131836
131836
131348
131348
130046
132813
132813
133138
133138
133626
133626
134928
1200
2400
4800
0.5
1
1200
2400
4800
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
10/30
STMICROELECTRONICS [ ST ]
