si4330 Silicon Laboratories, si4330 Datasheet - Page 133

• Manufacturer Part Number: si4330
• Description: Si4330 Ism Receiver
• Manufacturer: Silicon Laboratories

Register 74h. Frequency Offset 2
Register 75h. Frequency Band Select
Reset value = 00000000
Reset value = 01110101
The RF carrier frequency can be calculated as follows:
f
where parameters f
79h and 7Ah.
carrier
Name
Name
Type
Type
Bit
Bit
7:2
1:0
4:0
Bit
Bit
7
6
5
= (f
b
Reserved
+24+(f
Reserved
Reserved
Name
fo[9:8]
Name
fb[4:0]
D7
D7
sbsel
hbsel
R
c
+f
c
o
, f
) / 64000) x 10000 x (hbsel+1) + (f
o
, f
Reserved.
Upper Bits of the Frequency Offset Setting.
fo[9] is the sign bit.The frequency offset can be calculated as Offset = 156.25 Hz x (hbsel
+ 1) x fo[7:0]. fo[9:0] is a twos complement value. Reading from this register will give the
AFC correction last results, not this register value.
Reserved.
Side Band Select.
High Band Select.
Setting hbsel = 1 will choose the frequency range from 480–960 MHz (high bands). Set-
ting hbsel = 0 will choose the frequency range from 240–479.9 MHz (low bands).
Frequency Band Select.
Every increment corresponds to a 10 MHz Band for the Low Bands and a 20 MHz Band
for the High Bands. Setting fb[4:0] = 00000 corresponds to the 240–250 MHz Band for
hbsel = 0 and the 480–500 MHz Band for hbsel = 1. Setting fb[4:0] = 00001 corresponds
to the 250–260 MHz Band for hbsel = 0 and the 500–520 MHz Band for hbsel = 1.
sbsel
b
R/W
D6
D6
and hb_sel come from registers 73h–77h. Parameters f
hbsel
R/W
D5
D5
Reserved
R
Preliminary Rev 0.2
D4
D4
hch
x f
hs
x 10) [kHz],
Function
Function
D3
D3
fb[4:0]
R/W
D2
D2
hch
and f
hs
D1
D1
come from register
fo[9:8]
Si4330
R/W
D0
D0
133