參數(shù)資料
型號(hào)： ZL10039LCF
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 消費(fèi)家電
英文描述： Digital Satellite Tuner with RF Bypass
中文描述： SPECIALTY CONSUMER CIRCUIT, QCC28
封裝： 5 X 5 MM, MO-220, QFN-28
文件頁(yè)數(shù)： 18/35頁(yè)
文件大?。?/td> 694K
代理商： ZL10039LCF
ZL10039
Data Sheet
18
Zarlink Semiconductor Inc.
The bandwidth of the baseband filter is given by the following expression:
Equation
1
where:
fbw
=
the filter bandwidth in MHz within the range 8 MHz to 43 MHz.
fxtal
=
crystal oscillator frequency in MHz.
BR
=
decimal value of the bits BR[4:0], range 1-31.
(BR = 0 is not allowed)
BF
=
decimal value of the register bits BF[7:0], range 0 - 255.
The above equation can be re-arranged as follows
=
Equation
2
It is recommended that BR should be set so that
is approximately 1 MHz
This sets the bandwidth resolution to approximately 200kHz
The value of BF can now be calculated from Equation 2 and rounded to the nearest integer:
Example
Conditions: fxtal = 10.111 MHz, fbw = 26.5 MHz
Choose BR = 10
BF = 132
The actual filter bandwidth is therefore given by:
(
)
1
+
BF
x
5.088
x
BR
fxtal
fbw
=
1
fxtal
BR
x
5.088
fbw x
BF
BR
fxtal
132.35
=
10.111
10
x
5.088
x
26.5
BF
=
(
)
MHz
43
.
26
5.088
1
x
1
+
132
x
10
10.111
fbw
=
=
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