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MLX71122 Datasheet(PDF) 13 Page - Melexis Microelectronic Systems

Part # MLX71122
Description  300 to 930MHz FSK/FM/ASK Receiver
PDF  44 Pages
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Manufacturer  MELEXIS [Melexis Microelectronic Systems]
Direct Link  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

MLX71122 Datasheet(HTML) 13 Page - Melexis Microelectronic Systems

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PR
EL
IM
INA
RY
MLX71122
300 to 930MHz
FSK/FM/ASK Receiver
39010 71122
Page 13 of 44
Data Sheet
Rev. 007
Oct/07
3.2.2
Calculation of LO1 and IF1 frequency for High Frequency Bands
Typical ISM band operating frequencies like 868.3 and 915MHz can be covered without changing the crystal
nor the VCO inductor.
Low-low injection should be used for the high frequency bands. First of all choose a PFD frequency fPFD
according to below table. The R counter values are valid for a 10MHz crystal reference. The PFD frequency
is given by fPFD = fRO /R.
Injection Type
fCH [kHz]
fPFD [kHz]
R
l-l
20
16
625
l-l
25
20
500
l-l
50
40
250
l-l
100
80
125
l-l
250
200
50
l-l
500
400
25
The second step is to calculate the missing parameters fLO1, fIF1, Ntot, N and A. While the second IF (fIF2), the
NLO2 divider ratio and the prescaler divider ratio P are bound to fIF2 = 2MHz, NLo2 = 4 (or 8) and P =32.
)
f
(f
1
N
N
f
IF2
RF
LO2
LO2
LO1
−
+
=
2MHz)
(f
5
4
f
RF
LO1
−
=
(8)
1
N
f
N
f
f
LO2
IF2
LO2
RF
IF1
+
+
=
5
8MHz
f
f
RF
IF1
+
=
(9)
Finally N and A can be calculated with formula (5).
3.2.3
Counter Setting Examples for SPI Mode
To provide some examples, the following table shows some counter settings for the reception of the well-
known ISM and SRD frequency bands. The channel spacing is assumed to be fCH = 100kHz. In below table
all frequency units are in MHz.
Inj
fRF
fIF1
fLO1
Ntot
N
P
A
fPFD
R
fREF
fLO2
fIF2
h-h
300
97.3
397.3
2980
93
32
4
0.133
75
10
99.3
2
h-h
315
102.3
417.3
3130
97
32
26
0.133
75
10
104.3
2
h-h
434
142
576
4320
135
32
0
0.133
75
10
144
2
h-h
470
154
624
4680
146
32
8
0.133
75
10
156
2
l-l
850
171.6
678.4
8480
256
32
0
0.08
125
10
169.6
2
l-l
868
175.2
692.8
8660
270
32
20
0.08
125
10
173.2
2
l-l
915
184.6
730.4
9130
285
32
10
0.08
125
10
182.6
2
l-l
930
187.6
742.4
9280
290
32
0
0.08
125
10
185.6
2



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