參數(shù)資料
型號： TDA5200
廠商： INFINEON TECHNOLOGIES AG
元件分類： 參考電壓二極管
英文描述： surface mount silicon Zener diodes
中文描述： 表面貼裝硅穩(wěn)壓二極管
文件頁數(shù)： 26/43頁
文件大小： 911K
代理商： TDA5200
Applications
4 - 6
TDA 5200
Wireless Components
Specification, March 2000
4.4 Quartz Frequency Calculation
The quartz frequency is calculated by using the following formula:
QU
= (
RF
± 10.7) / r
(1),
with
RF
LO
QU
r
....
receive frequency
....
local oscillator (PLL) frequency (
RF
± 10.7)
quartz oscillator frequency
....
....
ratio of local oscillator (PLL) frequency and quartz
frequency as shown in the subsequent table.
Subtraction of 10.7 occurs in case the receive frequency is higher than the
intended local oscillator frequency, addition in case the receive frequency lies
below the local oscillator frequency.
Examples:
Table 4-1 PLL Division Ratio Dependence on States of FSEL and CSEL
FSEL
CSEL
Ratio r = (f
LO
/f
QU
)
open
open
64
open
GND
32
GND
open
128
GND
GND
64
(
)
MHz
MHz
MHz
f
40156
.
13
64
/
7
10
4
868
QU
=
=
(
)
MHz
MHz
MHz
f
7008
.
128
/
7
10
4
868
QU
=
=
(
)
MHz
MHz
MHz
f
23437
.
13
32
/
7
10
2
434
QU
=
=
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