Datasheet

Functional description ST7538Q
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5.3 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 7. ST7538Q synthesized frequencies
Carrier
Frequency
(KHz)
Baud
Rate
Deviation
Exact
Frequency [Hz]
(Clock=16MHz)
Carrier
Frequen
cy
(KHz)
Baud
Rate
Deviation
Exact
Frequency [Hz]
(Clock=16MHz)
“1” “0” “1” “0”
60 600 -- 82.05 600 --
1 59733 60221 1 81706 82357
1200 0.5 59733 60221 1200 0.5 81706 82357
1 59408 60547 1 81380 82682
2400 0.5 59408 60547 2400 0.5 81380 82682
1 58757 61198 1 80892 83171
4800 0.5 58757 61198 4800 0.5 80892 83171
1 57617 62337 1 79590 84473
66 600 -- 86 600 --
1 65755 66243 1 85775 86263
1200 0.5 65755 66243 1200 0.5 85775 86263
1 65430 66569 1 85449 86589
2400 0.5 65430 66569 2400 0.5 85449 86589
1 64779 67220 1 84798 87240
4800 0.5 64779 67220 4800 0.5 84798 87240
1 63639 68359 1 83659 88379