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參數(shù)資料
| 型號： | ZL10036LDF1 |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 消費家電 |
| 英文描述： | Digital Satellite Tuner with RF Bypass |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, QCC40 |
| 封裝： | 6 X 6 MM, LEAD FREE, QFN-40 |
| 文件頁數(shù)： | 28/38頁 |
| 文件大?。?/td> | 939K |
| 代理商： | ZL10036LDF1 |
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ZL10036
Data Sheet
28
Zarlink Semiconductor Inc.
4.3.4 Filter Bandwidth Programming Examples
Example 1, conditions:
f
xtal
= 10.111MHz,
f
bw
= 9MHz
Because
f
bw
is below 28.2MHz, the value of BR can be evaluated with equation 2:
xtal
575kHz
575kHz
This result should be rounded down to 17 to ensure that the result is not below the 575 kHz limit. Using this value
for BR, equation 4 can be evaluated:
The result can be rounded to the nearest value, i.e., BF = 18.
Example 2, conditions:
f
xtal
= 10.111MHz,
f
bw
= 34.6MHz
In this case,
f
bw
is above 28.2MHz so using equation 3 to solve for BR:
f
bw
K
34.6MHz
Using equation 4, this time with the rounded-down value of 14 for BR:
bw
f
xtal
10.11MHz
Rounding to the nearest integer thus gives a value of 59 for BF.
4.4 Programming Sequence for Filter Bandwidth Changes
a.
Byte 6:
Set RSD = 0 to re-enable baseband filter resistor switching.
b.
Byte 7:
Set BF6:1 to the value derived in 4.3.3.2, “Calculating the Value of BF“ on page 27.
c.
Byte 6:
Set RSD = 1 to disable baseband filter resistor switching. This must happen no sooner than a
certain time after (b.). This minimum time equals BR/(32 * f
xtal
) seconds, where BR is the decimal value of
byte BR and f
xtal
is the reference crystal frequency.
BR
------f
10.111MHz
17.583
=
=
=
BF
bw
f
xtal
f
BR
×
K
×
1
–
10.11MHz
------9MHz
17
×
1.257
×
1
–
18.02285
=
=
=
BR
-------
63
(
)
×
1
---
×
10.111MHz
------------------------------
63
(
)
×
1.257
--------------
×
14.647
=
=
=
BF
f
BR
×
K
×
1
–
34.6MHz
14
×
1.257
×
1
–
59.227
=
=
=
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| ZL10037LCF | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Digital Satellite Tuner with RF Bypass |
| ZL10037LCF1 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Digital Satellite Tuner with RF Bypass |
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