Si4430/31/32-B1
26
Rev 1.1
The chip will automatically shift the frequency of the Synthesizer down by 937.5 kHz (30 MHz ?32) to achieve the
correct Intermediate Frequency (IF) when RX mode is entered. Low-side injection is used in the RX Mixing
architecture; therefore, no frequency reprogramming is required when using the same TX frequency and switching
between RX/TX modes.
Table 12. Frequency Band Selection
fb[4:0] Value
N
Frequency Band
hbsel=0
hbsel=1
0
24
240249.9 MHz
480499.9 MHz
1
25
250259.9 MHz
500519.9 MHz
2
26
260269.9 MHz
520539.9 MHz
3
27
270279.9 MHz
540559.9 MHz
4
28
280289.9 MHz
560579.9 MHz
5
29
290299.9 MHz
580599.9 MHz
6
30
300309.9 MHz
600619.9 MHz
7
31
310319.9 MHz
620639.9 MHz
8
32
320329.9 MHz
640659.9 MHz
9
33
330339.9 MHz
660679.9 MHz
10
34
340349.9 MHz
680699.9 MHz
11
35
350359.9 MHz
700719.9 MHz
12
36
360369.9 MHz
720739.9 MHz
13
37
370379.9 MHz
740759.9 MHz
14
38
380389.9 MHz
760779.9 MHz
15
39
390399.9 MHz
780799.9 MHz
16
40
400409.9 MHz
800819.9 MHz
17
41
410419.9 MHz
820839.9 MHz
18
42
420429.9 MHz
840859.9 MHz
19
43
430439.9 MHz
860879.9 MHz
20
44
440449.9 MHz
880899.9 MHz
21
45
450459.9 MHz
900919.9 MHz
22
46
460469.9 MHz
920939.9 MHz
23
47
470479.9 MHz
940960 MHz
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