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參數(shù)資料
| 型號： | CE5038 |
| 廠商： | Intel Corp. |
| 英文描述： | DVB-S2 Advanced Modulation Satellite Tuner |
| 中文描述： | DVB - S2的先進調制衛(wèi)星調諧器 |
| 文件頁數(shù)： | 18/41頁 |
| 文件大?。?/td> | 463K |
| 代理商： | CE5038 |
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CE5038
Data Sheet
17
Intel Corporation
Figure 10 - Normalized Filter Transfer Characteristic (setting 20 MHz)
The -3 dB bandwidth of the filter (Hz) is given by the following expression:
Where:
f
-3dB
= Baseband filter –3 dB bandwidth (Hz) which should be within the range
f
xtal
= Crystal oscillator reference frequency (Hz).
.
K = 1.257 (constant).
BF = Decimal value of the register bits BF6:BF1, range 0 - 62.
BR = Decimal value of the bits BR4:BR0 (baseband filter reference divider ratio), range 4 - 27.
BR
= 575 kHz to 2.5 MHz.
Methods for determining the values of BR and BF are given in the section on software, please see sect. 4.3 on
page 30.
2.5 Local Oscillator
The LO on the CE5038 is fully integrated and consists of three oscillator stages, each with 16 sub-bands. These are
arranged such that the regions of operation for optimum phase noise are continuous over the required tuning range
of 950 to 2150 MHz and over the specified operating ambient conditions and process spread.
The local oscillators operate at a harmonic of the required frequency and are divided down to the required LO
conversion frequency. For each of the three oscillators, the LO prescaler ratio (N
LP
) is set to ÷4 or ÷2. The required
divider ratio is automatically selected by the LO control logic, hence programming of the required conversion
frequency across the oscillator bands is automatic and requires no intervention by the user.
f
-3dB
BR
---------
BF
1
+
(
)
1
K
---
×
×
=
8MHz
f
3dB
–
35MHz
≤
≤
---------
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