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| 型号： | ZL10038LDG |
| 厂商： | Zarlink Semiconductor Inc. |
| 英文描述： | MULTIMETER, DIGITAL; Accuracy, AC voltage range:+/-1.5% rdg + 3 digits; Accuracy, DC current range:+/-2.5% rdg + 3 digits; Accuracy, DC voltage range:+/-1.2% rdg + 3 digits; Accuracy, resistance range:+/-1.5%rdg + 3 digits; Current RoHS Compliant: NA |
| 中文描述： | 数字卫星调谐器射频旁路 |
| 文件页数： | 17/38页 |
| 文件大小： | 939K |
| 代理商： | ZL10038LDG |
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ZL10036
Data Sheet
17
Zarlink Semiconductor Inc.
2.4 Baseband Filter
The filter bandwidth is controlled by a Frequency Locked Loop (FLL) the timing of which is derived from the
reference crystal source by a reference divider. Five control bits set the system reference division ratio and the
baseband filter bandwidth can be programmed with a further six control bits for a nominal range of 4 - 40MHz
1
.
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 4.3, “Symbol
Rate and Filter Calculations“ on page 26.
1. specification compliant over the range 8 - 35 MHz.
Normalised Filter Response (20MHz filter setting)
-100
-80
-60
-40
-20
0
0.1
1
10
100
f/fc
N
f
-3dB
BR
---------
BF
1
+
(
)
1
K
---
×
×
=
8MHz
f
3dB
–
35MHz
≤
≤
---------
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