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參數(shù)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(guān)電容濾波器 |
| 文件頁數(shù)： | 24/28頁 |
| 文件大?。?/td> | 868K |
| 代理商： | LMF100 |
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3.0 Applications Information
(Continued)
Mode 1b
Mode 2 and Mode 5
Mode 3
Mode 6a and 6c
Mode 6b
In many applications, the outputs are ac coupled and dc off-
sets are not bothersome unless large signals are applied to
the filter input. However, larger offset voltages will cause
clipping to occur at lower ac signal levels, and clipping at any
of the outputs will cause gain nonlinearities and will change
f
and Q. When operating in Mode 3, offsets can become ex-
cessively large if R
and R
are used to make f
/f
signifi-
cantly higher than the nominal value, especially if Q is also
high.
For example, Figure 23 shows a second-order 60 Hz notch
filter. This circuit yields a notch with about 40 dB of attenua-
tion at 60 Hz. A notch is formed by subtracting the bandpass
output of a mode 3 configuration from the input using the un-
used side B opamp. The Q is 10 and the gain is 1 V/V in the
passband. However, f
/f
= 1000 to allow for a wide input
spectrum. This means that for pin 12 tied to ground (100:1
mode), R4/R2 = 100. The offset voltage at the lowpass out-
put (LP) will be about 3V. However, this is an extreme case
and the resistor ratio is usually much smaller. Where neces-
sary, the offset voltage can be adjusted by using the circuit of
Figure 24 This allows adjustment of V
, which will have
varying effects on the different outputs as described in the
above equations. Some outputs cannot be adjusted this way
in some modes, however (V
OS(BP)
in modes 1a and 3, for
example).
DS005645-12
FIGURE 22. Offset Voltage Sources
www.national.com
24
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PDF描述 |
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| 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(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):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(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
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