參數(shù)資料
型號： OL2300NHN
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡
英文描述： Fractional-N PLL based transmitter
中文描述： SPECIALTY TELECOM CIRCUIT, PQCC16
封裝： 3 X 3 MM, 0.85 MM HEIGHT, LEAD FREE, PLASTIC, MO-220, SOT758-1, VQFN-16
文件頁數(shù)： 17/46頁
文件大小： 951K
代理商： OL2300NHN
OL2300
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 2 — 28 October 2010
17 of 46
NXP Semiconductors
OL2300
Fractional-N PLL based transmitter
6.5 Frequency control and FSK operation
FSK modulation is applied if the ASK control bit of the selected ACON register is cleared.
ACON0 or ACON1 can then be selected for the FSK transmission amplitude setting
dependent on the setting of the transmit-command control-bit ‘D’, (see
Table 10
).
6.6 Frequency control registers
The operation frequency is set by the content of the frequency control registers FC1 to
FC4, which each have a width of 18 bits. The two MSBs of all four frequency control
registers are located in the register FCA. The two corresponding ‘LOW’ bytes are located
in FCxH and FCxL registers. The selection of the ‘a(chǎn)ctive’ frequency control register is
done directly with the transmit command (bits ‘E’ and ‘F’, see
Section 6.7.10
). See for
frequency configuration 1 an example of the complete frequency setting.
Table 18.
SFR
bit
FCON
Table 19.
SFR
bit
FCON
6.6.1
PLL operation frequency f
VCO
The PLL operation frequency is calculated by the following equations:
(6)
Frequency step width:
Table 20.
Variable
f
VCO
f
ref
f
VCOstep
f
xtal
f
RF
FC
[1]
f
ref
can be set to 0.5f
xtal
by a test-mode bit.
In order to avoid fractional-N overflow don’t use values above 163839.
a) f
ref
= f
xtal
.
b) f
RF
= f
VCO
for 868/915 MHz bands (FBSL set to 1).
c) f
RF
= f
VCO
/2 for 315/434 MHz bands (FBSL set to 0).
d) FC = 0... 163839.
[2]
Frequency control bits
FCA
F1C17
F1C16
17
16
FC1H
F1C15
15
F1C14
14
F1C13
13
F1C12
12
F1C11
11
F1C10
10
F1C9
9
F1C8
8
Frequency control bits
FC1L
F1C7
7
F1C6
6
F1C5
5
F1C4
4
F1C3
3
F1C2
2
F1C1
1
F1C0
0
PLL operation frequency calculation parameters
Description
VCO frequency
PLL reference frequency
[1]
minimum VCO frequency step
XTAL oscillator frequency
RF frequency on PAOUT
frequency control value (FCx register)
[2]
f
VCO
f
ref
f
32768
------------------
65
+
×
Hz
=
f
VCOstep
f
32768
--------------
Hz
=
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