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Micrel
MICRF211
JP1 and JP2 are the bandwidth selection for the
demodulator bandwidth. To set it correctly, it is
necessary to know the shortest pulse width of the
encoded data sent in the transmitter. Like in the
example of the data profile in the figure 7 below, PW2
is shorter than PW1, so PW2 should be used for the
demodulator bandwidth calculation which is found by
0.65/shortest pulse width. After this value is found, the
setting should be done according to Table 6. For
SEL0
JP1
Short
Open
Short
Open
SEL1
JP2
Short
Short
Open
Open
Demod.
BW
(hertz)
1460
2921
5842
11684
Shortest
Pulse
(μsec)
445
223
111
56
Maximum
baud rate for
50% Duty
Cycle (Hertz)
1123
2246
4493
8987
example, if the pulse period is 100μsec, 50% duty
cycle, the pulse width will be 50μsec (PW = (100μsec
× 50%) / 100). So, a bandwidth of 13kHz would be
necessary (0.65 / 50μsec). However, if this data
stream had a pulse period with 20% duty cycle, the
bandwidth required would be 32.5kHz (0.65 / 20μsec),
which exceeds the maximum bandwidth of the
demodulator circuit. If one tries to exceed the
Table 8. JP1 and JP2 setting, 390.0 MHz.
Capacitors C6 and C4, C TH and C AGC respectively
provide time base reference for the data pattern
received. These capacitors are selected according to
data profile, pulse duty cycle, dead time between two
received data packets, and if the data pattern has or
maximum bandwidth,
stretched or wider.
the pulse would
appear
does not have a preamble. See Figure 7, example of
a data profile.
SEL0
JP1
SEL1
JP2
Demod.
BW
(hertz)
Shortest
Pulse
(μsec)
Maximum
baud rate for
50% Duty
Cycle (hertz)
Short
Open
Short
Short
Short
Open
1625
3250
6500
400
200
100
1250
2500
5000
Open
Open
13000
50
10000
Figure 7. Example of a Data Profile.
Table 6. JP1 and JP2 setting, 433.92 MHz.
Other frequencies will have different demodulator
bandwidth limits, which are derived from the reference
oscillator frequency. Table 7 and Table 8 below shows
the limits for the other two most used frequencies.
For best results the capacitors should always be
optimized for the data pattern used. As the baud rate
increases, the capacitor values decrease. Table 9
shows suggested values for Manchester Encoded
data, 50% duty cycle.
SEL0
JP1
Short
Open
Short
Open
SEL1
JP2
Short
Short
Open
Open
Demod.
BW
(hertz)
1565
3130
6261
12523
Shortest
Pulse
(μsec)
416
208
104
52
Maximum
baud rate for
50% Duty
Cycle (hertz)
1204
2408
4816
9633
SEL0
JP1
Short
Open
Short
Open
SEL1
JP2
Short
Short
Open
Open
Demod.
BW
(hertz)
1625
3250
6500
13000
Cth
100nF
47nF
22nF
10nF
Cagc
4.7μF
2.2μF
1μF
0.47μF
Table 7. JP1 and JP2 setting, 418.0 MHz.
Table 9. Suggested C TH and C AGC Values.
JP3 is a jumper used to configure the digital squelch
function. When it is high, there is no squelch applied
to the digital circuits and the DO (data out) pin has a
hash signal. When the pin is low, the DO pin activity is
March 2007
11
M9999-030107
(408) 944-0800
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