EVB71122
300 to 930MHz Receiver
Evaluation Board Description
2.2.4
Counter Settings in ABC Mode – 8 Preconfigured Channels
In ABC mode (SPISEL=0), the counter settings are hard-wired. In below table all frequency units are in MHz.
FSK
1
2
3
4
5
6
7
8
f
RF
369.5
371.1
375.3
376.9
388.3
391.5
394.3
395.9
f
IF1
120.5
121.0
122.4
123.0
126.8
127.8
128.8
129.3
f
LO1
490.0
492.0
497.7
499.9
515.1
519.3
523.1
525.2
N
tot
3675
3691
3733
3749
3863
3895
3923
3939
N
114
115
116
117
120
121
122
123
P
32
32
32
32
32
32
32
32
A
27
11
21
5
23
23
19
3
f
PFD
0.133
0.133
0.133
0.133
0.133
0.133
0.133
0.133
R
75
75
75
75
75
75
75
75
f
REF
10
10
10
10
10
10
10
10
f
LO2
122.5
123.0
124.4
125.0
128.8
129.8
130.8
131.3
f
IF2
2
2
2
2
2
2
2
2
List of Mathematical Acronyms
A
f
FB
floor (x)
f
PFD
f
RO
=
f
R
R
f
RO
divider ratio of the swallow counter (part of feedback divider)
f
VCO
N
tot
=
N
⋅
P
+
A
N
N
LO2
P
R
Y
R
A
IN
IM
L
E
R
P
frequency at the feedback divider output
The floor function gives the largest integer less than or equal to x.
For example, floor(5.4) gives 5, floor(-6.3) gives -7.
PFD frequency in locked state
reference frequency of the PLL
frequency of the crystal reference oscillator
frequency of the VCO (equals the LO1 signal of the first mixer)
total divider ratio of the PLL feedback path
divider ratio of the program counter (part of feedback divider)
LO2DIV divider ratio, to derive the LO2 signal from LO1 (N
1
= 4 or 8)
divider ratio of the prescaler (part of feedback divider)
divider ratio of the reference divider R
39012 71122 01
Rev. 001
Page 10 of 32
EVB Description
Sept/06
MELEXIS [ Melexis Microelectronic Systems ]
