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參數資料
| 型號： | LMF100 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High Performance Dual Switched Capacitor Filter |
| 中文描述： | 高性能雙開關電容濾波器 |
| 文件頁數： | 25/28頁 |
| 文件大小： | 868K |
| 代理商： | LMF100 |
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3.0 Applications Information
(Continued)
3.5 SAMPLED DATA SYSTEM CONSIDERATIONS
The LMF100 is a sampled data filter, and as such, differs in
many ways from conventional continuous-time filters. An im-
portant characteristic of sampled-data systems is their effect
on signals at frequencies greater than one-half the sampling
frequency. (The LMF100’s sampling frequency is the same
as its clock frequency.) If a signal with a frequency greater
than one-half the sampling frequency is applied to the input
of a sampled data system, it will be “reflected” to a frequency
less than one-half the sampling frequency. Thus, an input
signal whose frequency is f
/2 + 100 Hz will cause the sys-
tem to respond as though the input frequency was
f
/2 100 Hz. This phenomenon is known as “aliasing”, and
can be reduced or eliminated by limiting the input signal
spectrum to less than f
/2. This may in some cases require
the use of a bandwidth-limiting filter ahead of the LMF100 to
limit the input spectrum. However, since the clock frequency
is much higher than the center frequency, this will often not
be necessary.
Another characteristic of sampled-data circuits is that the
output signal changes amplitude once every sampling pe-
riod, resulting in “steps” in the output voltage which occur at
the clock rate (Figure 25). If necessary, these can be
“smoothed” with a simple R-C low-pass filter at the LMF100
output.
The ratio of f
to f
(normally either 50:1 or 100:1) will also
affect performance. A ratio of 100:1 will reduce any aliasing
problems and is usually recommended for wide-band input
DS005645-39
R1
R2 = 1 k
R3 = 100 k
R4 = 100 k
Rg = 10 k
Rl = 10 k
Rh = 10 k
= 100 k
FIGURE 23. Second-Order Notch Filter
DS005645-13
FIGURE 24. Method for Trimming V
OS
www.national.com
25
相關PDF資料 |
PDF描述 |
|---|---|
| LMF100CCN | High Performance Dual Switched Capacitor Filter |
| LMF100CIWM | High Performance Dual Switched Capacitor Filter |
| LMF100ACN | IC-MONOLITHIC FILTER |
| LMF380 | LMF380 Triple One-Third Octave Switched-Capacitor Active Filter |
| LMF380C1J | LMF380 Triple One-Third Octave Switched-Capacitor Active Filter |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LMF100ACN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:IC-MONOLITHIC FILTER |
| LMF100AJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Filter |
| LMF100CCN | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:FILTER DUAL SWITCHED CAP DIP 100 |
| LMF100CCN | 制造商:Texas Instruments 功能描述:FILTER DUAL SWITCHED CAP DIP 100 |
| LMF100CCN/NOPB | 功能描述:IC FILTER DUAL SWITCH CAP 20-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1,000 系列:- 濾波器類型:連續時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數:4 濾波器階數:8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) |
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